GOLD POTENTIAL AT THE MATEPONO RIVER MOUTH AND ADJACENT AREAS, SOLOMON ISLANDS
- an augering program -
Jackson Lurn', David Michael', Ivan Leanamae Watson Sato, Sekove Motuiwaca, Setareki Ratu'
September 1995 SOPAC Technical Report 222
SOPAC Secretariat Ministry of Energy, Water and Mineral Resources, Solomon Islands
This project was funded mainly by the Government of Canada
[3]
TABLE OF CONTENTS
Page SUMMARY...........................................................
ACKNOWLEDGEMENTS......................................................................
INTRODUCTION..........................................................................................................................7
OBJECTIVES.................................................................................. 7
..................
History
Geology
FIELD ACTIVITIES AND EQUIPMENT
Field Activities.................................................................... 9
.................................... 13
................... 15
RESULTS
Field..................................................................................................................................15
......................................................................................................................... 19
DISCUSSION
....................................................................................... 23
....................................................................................... 27
CONCLUSIONS.......................................................................................................................... 27
RECOMMENDATIONS ...... ...................................................28
BIBLIOGRAPHY ...................................................................................................................... 29
APPENDIX
1 Logs of Auger Holes .......................................................................................... 31
2 Total Intensity Data and Distance of Lines.............................................................
[TR222 - Lum & Others]
[4]
LIST OF FIGURES
Figure
1 Location map .......................................................................................................... 10
2
3
4
5
Area C in Tetere Bay showing magnetometer survey lines. ......................... 11
Flow chart illustrating the sequence of events of the survey activities ................ 12
Royal Solomon Island Police assist in checking augering sites for WWII bombs....... 12
Augering in the beach. A team of five people working non-stop .............................. ... averaged 2 holes/day 13
to depths of 6 m ....................... 6 Augering in the beach. The use of casing is essential when augering
...... 14
7 Pitting at Location MRA1-26 ............................ 14
8 Line MRA1 showing drill targets
9 Line MRA2 showing drill targets ............. 16
10 Line MRA3 showing drill targets............................................................................ 17
11 Line MRA4 showing drill targets................................................................................. 18
12 Line MRA5 showing drill targets................................................................................. 18
13 Flowchart of sample analysis...................................................................................... 20
14 Panning results are best achieved if panning is conducted in comfortable surroundings ..... ...... ....... ...... ....... .. 22
15 Gold grains of sample MRA3-348 showing irregular shapes .... ................. 25
Gold grains of sample MRA5-535 with quartz inclusions........................................... 26 16
Table
1
2
History of work undertaken at the area around Matepono River................................... 8
microscopic examination............................................................... 21
3 Description of gold grains....... ........................................... 24
Results of gold analysis by fire assay and gold count by
[TR222 - Lum & Others]
[5]
SUMMARY
An auger program consisting of 16 holes was undertaken in the lower reaches of the Matepono
River to test the anomalies defined in the survey reported in Lum et al. (1994). A magnetometer
survey marked targets for augering in the field. Holes were augered to a maximum depth of 6 m
and samples obtained for gold analysis.
The magnetometer survey confirmed that the magnetite layers are represented by gentle and
smooth sigmoidal curve anomalies and gravel beds represented by tight and high erratic
sigmoidal curve anomalies when total magnetic intensity readings are plotted against distance for
the respective traverse lines.
The augering program confirmed the presence of magnetite layers and gravels beds in the
survey area. Magnetite layers are up to 25 cm in thickness and gravel beds consist mainly of
rounded basaltic and quartz gravel. Samples were collected at one-meter intervals and some
100 samples weighing approximately 1 tonne was collected for gold analysis.
The gold content of the samples were evaluated by hand panning followed by fire assay.
Placer gold occurs in the sediments of the area investigated to up to depths of 6 m. Gold with
values of up to 0.292ppm occur in the upper magnetic layer and in the lower gravels.
Microscopic examination of hand panned samples showed that the gold was fine grained .
The survey was technically successful in defining the presence of gold in the area. It was not
designed to identify minable deposits because of the method of sampling, and the limitations of
the gold analysis technique. If mining targets are required then bulk testing followed by pilot
testing of selective sites are essential.
I [TR222 - Lum & Others] !
[6]
ACKNOWLEDGEMENTS
Funds for this project were contributed largely by the Government of Canada.
The work was carried out with the assistance of the Government of Solomon islands. The
support from the following personnel from the Solomon Island's Ministry of Energy, Water, and
Mineral Resources is acknowledged:
Mr Steven Danitofea Permanent Secretary
Mr Donn Tolia Director
Mr Renell Magu
Mr Linus Buia Chainsaw Man
Principal Mapping Geologist
The assistance of the Royal Solomon Island Police in checking for buried bombs from World War
II, in the target sites prior to augering is appreciated.
Landowners' permission to conduct the survey is acknowledged.
[TR222 - Lum & Others]
[7]
INTRODUCTION
At the request of the Government of the Solomon Islands, a follow-up program of augering was
undertaken at the mouth of the Matepono River and its adjacent area. The earlier phase of the
reported is documented in Lum et al. (1994) who identified well defined, elongated, continuous
and narrow magnetic bodies parallel to the present shoreline. These magnetic bodies are
numerous and extend up to the end of the 1 km survey boundary, indicating the possibility of the
continuation of additional anomalies inland which were developed by both periodic storms and
normal tidal action. The report recommended sampling of the magnetic bodies by augering to
depths of 6m, pitting and trenching and analysing the samples for gold.
The augering program was conducted from 12 March to 1 April 1995 and consisted of 16 auger
holes. Each auger hole was logged and samples collected at one-metre internal. Detailed logs of
the holes are presented in Appendix 2.
The project was undertaken as part of the SOPAC Coastal Program for the Solomon Islands:
Project SI 1.1/95. Data collected during the survey is presented in Appendix 1 and original data
and disk are archived at SOPAC as Survey No. SI.95.01. This report should be read inconjuction
with SOPAC Technical Report 213 by Lum et al (1994) which contains descriptive details of
geology and history.
Work undertaken by SOPAC in this project is considered as a demonstrative study conducted to
promote the potential of gold to the private sector via government. SOPAC withdraws from the
project if the area shows no potential or if private sector shows interest.
OBJECTIVES
The objective of the survey was to test the anomalies defined by the previous survey (Lum et al.
1994), for the potential of gold. Work undertaken at the mouth of the Matepono River and along
the Tetere Bay beach confirms the presence of alluvial gold but in uneconomical amounts.
Unless a greater volume of gold-bearing material or richer gold contents is discovered, the
Matepono River and its adjacent area will remain unprospective. To improve the prospectivity,
anomalies which extended inland were tested for the possibility of detrital gold by augering.
[TR222 - Lum & Others]
[8]
History
Table 1 documents the history of work undertaken in the area. A descriptive account can be
found in Lum et al (1991) and SOPAC Technical Report 213 by Lum et al (1994). It should be
noted that apart from the work undertaken by SOPAC there has been very little investigation
conducted in the area.
Table 1. History of work undertaken around Matepono River mouth.
.................................................... ................................................ ........................................ First record of gold i
Small scale prospectors mined gold int
the Matepono River
Gold traced to the bedrock a
slands documented at the mouth ono River
from alluvials of the Chovohio Riv .......
1568
193 .......................................................... ............................................
......................................................................................... ..................................................... ........................ 1936-1937
1941-1
here most activity has since been conc d ............................................................................................................................. ................................................ mperor Mines Ltd and numerous lease holders prospe e Chovohio River and Matepono
........................................ ..................................... ers reported gold nuggets whil ches exact locations are
unknown but it can be assumed that it was near the mouth of Matepono River where much fighting took
............................... ....................................... with the Mineral and Water Resources Division of the Solomon Islands
conducted an offshore program of nearshore bottom sediment sampling and sub-bottom reflection
profiling to test the potential of placer gold ......................................................................................................
oceanographic data for a study related to coastal development ...........................................................
SOPAC conducted a geomorphological study as a basis for resources asse
economic developments.
SOPAC conducted a beach sampling program ........................................................... ..........................
..............................................................................................................................................................................................................................................;
a magnetometer survey to define targets for placer gold concentration ............................................... ..........................
Geology
The geology and geomorphology taken largely from Hackman (1980) and Roy (1990) is
described in detail in SOPAC Technical Report 213 by Lum et al (1994). The following is
repeated for the comprehensiveness of this report. Hackman (1 980) describes the Guadalcanal
coastal plain as being "built up from progressive coalescing of main river deltas which are still
expanding, The rivers bifurcate and meander extensively in their own alluvium which ranges from
clay to coarse gravel; much of the area is poorly drained". Roy (1990) indicates that coastal
changes measured over the last 40 years show an average annual progradation for the
[TR222 - Lum & Others]
[9]
Guadalcanal coastal plain to be about 1 million m of sediment. The Guadacanal plain is 47 km
in length and up to 10 km in width and is underlain by more than 50 m of sediments (Lum 1994).
In another words the volume of material is not a variable of concern should economical gold be
discovered.
FIELD ACTIVITIES AND EQUIPMENT
Field Activities
Access
Access to the area from Henderson Airport is by a 21-kilometre all-weather road to Tetere Bay
and I-kilometre walk or canoe trip (Figure 1). A canoe was requested for this part of the access
to ease the burden of hand-carrying equipment to and fro and also to lessen the effort of carrying
a total of approximately 3 tonnes of samples for a distance of a kilometre along the beach.
Survey
Site Area C was chosen along Tetere Bay as recommended by Lum et al. (1994). A
magnetometer survey was redone for Lines J1, J2, J3, J4 and J5 and relabelled as lines MRA1,
MRA2, MRA3, MRA4 and MRA5 (Figure 2). Traverse lines were repeated so as anomalous
targets could be marked with certainty. Following the identification of all anomalous targets in
each line, the total intensity data of each line was plotted against its respective distance and
auger holes targets selected. Figure 3 illustrates the sequence of events of the field activities.
Each auger site was checked for buried bombs as a caution by the Royal Solomon Police with a
bomb detector as the area was an active war zone during World War II (Figure 4). The area is
currently littered with rusty old US war tanks and relics.
Unlike the previous survey, only one magnetometer was engaged in the survey. No local base
station was setup for diurnal and micropulsation time variations as these were considered
unnecessary and was conducted by Lum et al. in 1994. However, magnetic cleanliness and
accurate senor positioning were observed throughout the survey. During the traverses, the
surveyors were free of all magnetic material, including zips in pants, clipboards, compasses and
[TR222 - Lum & Others]
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[10]
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[TR
222 -Lum
& others]
[11]
metallic eyeglasses. Sensor orientation was held perpendicular to the earth's field of orientation
and care taken that it was carried by one surveyor throughout each line traverse. Three total
intensity readings were recorded at each station and an average calculated and used for graph
plotting.
Auger targets were identified by sudden changes in total intensity readings of 200 nT or more.
The location was then recorded and flagged by coloured tape.
Total intensity readings were manually recorded and later fed into a computer for data
processing in the evenings. Total intensity as a function of distance was plotted for each traverse
line. The selection and criteria of auger targets were made by the SOPAC Geologist, Mr Lum,
with the aid of the modelling exercise conducted during the earlier survey. Approximately 10
possible targets per traverse line were defined in the field but three targets were selected for
augering. Augering was conducted in the beach, swamp, bush and grassland environments,
deliberately to cover a wide range of environments.
Figure 2. Area C in Tetere Bay showing new magnetometer survey lines.
[TR222 -Lum & others]
[12]
Gold Analysis sample preparation and fire and chemical assay of gold
Sampling sampling at 1 m interval
II'
sand augering to depths of 5 mAugering
Definition of Targets data input and processing
gridlinesMagnetometer Survey
Figure 3. Flow chart illustrating the sequence of events of the survey activities.
[TR222 -Lum & others]
[13]
Targets were then augered to depths of 6 m for each hole. Auger holes were logged and
sampled at 1-metre intervals. As augering was undertaken in a sandy strata environment,
casings and bailers were essential. Sample recovery was good, and at times there was 80 to 90
percent sample recovery. A team of 5 persons working hard and non-stop achieved an average
of two holes per day (Figures 5 and 6). Pitting was undertaken at two sites only (MRA 1-23 and
MRA 1 386) due to the poor recovery of samples by augering (Figure 7). Pitting and trenching
were considered unnecessary due to the anomalous material being located at depths greater
than 2 m.
Equipment
A Scintentex 767010 model portable proton precision magnetometer was used to record total
intensity of the magnetic field. As mentioned, only one magnetometer was used which is
sufficient when the main mineral responsible for the magnetic anomalies in the area is magnetite.
Magnetite acts as an amplifier of the main field having no influence on orientation. The
magnetometer has a sensitivity of 1 nT. A computer with Microsoft Excel program was used to
record and process the data to assist in further selecting the target sites for augering.
Figure 5. Augering on the beach. A team of five people working non-stop averaged 2 holes per day.
[TR222 -Lum & others]
[14]
Figure 6. Augering on the beach. The use of casing is essential when augering to depths of 6 m.
Figure 7. Pitting at location MRA 1-26. Pitting was undertaken when sample recovery was poor in the
augering program.
[TR222 -Lum & others]
[15]
An aluminium sand auger with 6 m casings and accessories was the augering tool used for the
survey. A tripod with a chain block pulley was taken but it was found to be unnecessary, heavy
and cumbersome.
Other essential equipment included hand held compasses, bright coloured flagging tapes, bush
knives and spades. Coloured aerial photographs at a scale of 1:3000 were obtained from
SOPAC. These photographs were flown by SOPAC in 1992 for a coastal survey undertaken in
the same year (Gillie 1992).
Training
Training of 4 staff of the Solomon islands Water and Mineral Resources Division was carried out
during the survey. David Michael, a Geologist with the Ministry of Energy, Water and Mineral
Resources Solomon Islands and an author of this report visited the Secretariat to assist with the
analysis of the data and the writing of the final report.
RESULTS
Field
Magnetic anomalies in the survey reconfirmed results of the previous survey of Lum et al (1994).
Anomalies were of two types - indicated by gentle smooth sigmoidal curves and erratic higher
and tighter sigmoidal curves when total intensity is plotted against distance, (see Figures 8, 9,
10, 11 and 12). Augering confirmed that gentle sigmoidal curves indicate magnetite beds and
erratic sigmoidal curves indicate gravel beds.
Line MRA1
Eleven anomalies were identified in the field that warranted further investigation. These are
illustrated by the sigmoidal curves in Figure 8. Three targets were defined, the first being on the
beach (MRA1-26), the second in the bush (MRA1-390) and the third in grassland (MRA1-446).
There was difficulty in augering through the gravels in hole MRA1-26 and a 2m pit was dug
instead. A log of the pit is presented in Appendix 2.
[TR222 - Lum & Others]
[17]
Line MRA3
Six anomalies were identified in the field that warranted further investigation but three targets
were selected, the first being on the edge of the beach and beginning of grassland (MRA3-42),
the second and third in the grassland (MRA3-348) and (MRA3-585) (Figure 10).
41400
41200
41000
40800
nT 40600
40400
40200
40000
0 100 200 300 400 500 600 700 800 900
Distance
Figure 10 showing Line MRA3 with drill targets
Line MRA4
Fifteen anomalies were identified in the field that warranted further investigation but four targets
were selected, the first being on the beach (MRA4-24), the second in the transition between bush
and swamp (MRA4-90) and the third in the bush (MRA4-235) and the fourth in grassland (MRA4-
307) (Figure 11). Due to buried logs in the area, there were fifteen attempts to auger MRA4-24 to
a depth of 6 m. MRA4-90 was augered in a non-anomaly area to test whether magnetite or
gravels would be intersected. The hole did not intersect any magnetite horizons but intersected a
very thin bed of gravel.
[TR222 -Lum & others]
[18]
41400
41200
41000
40800nT
40600
40400
402000 100 200 300 400 500 600 700 800 900 1000
Distance
Figure 11 showing Line MRA4 with drill targets.
Line MRA5
Eleven anomalies were identified in the field that warranted further investigation but three targets
were selected, the first being in the transition area between swamp and bush (MRA5-70), the
second and third in grassland (MRA5-467)and (MRA5-535) (Figure 12).
41600
41400
41200
41000
40800nT 40600
40400
40200
400000 100 200 300 400 500 600 700 800
Distance
Figure 12 showing Line MRA5 with drill targets
[TR222 -Lum & others]
[19]
Analytical
The sparsity of gold particles and nugget effect in sediment samples are major concerns in
obtaining gold analysis representative of any given sample. The sparsity of gold as determined
by the analysis of a split, depends not so much on the gold content of the sample as on whether
or not a random flake occurs in the analysed portion. Clifton et al (1967) showed that the error
could be as high as 80 percent and if gold was detected, the nugget effect would provide a
misleading high gold reading. This however could be largely eliminated by carefully concentrating
the samples prior to analysis. Hand panning is usually the cheapest method of concentrating the
samples but if very fine or flour gold exists then other methods of concentrating the samples, for
example the use of heavy liquid methylene iodide (SG =3.3), need to be taken into consideration.
Another problem associated with the analysis of gold is the amount of organic carbon contained
in the samples. This can be overcome by removing the carbon either through heating samples to
temperatures of 120°C prior to analysing for gold, or by using the fire assay technique for gold
analysis.
With the above in mind, a two staged approach was used to evaluate the samples (Figure 13).
Bulk leaching by cyanide (BCL) was considered but later dropped because of the high costs
(A$25.00 per sample). Previous results (Collins 1993) state that flour gold existed at Tetere
Beach. Gold grains averaged 0.16mm and the largest documented was 0.54mm in diameter.
With the unavailability of liquid methylene iodide, the samples were rolled and riffled and split to
1.5 kg after drying at 120°C for 12 hours. One split was sent in for fire assay, one hand-panned
and the remaining samples packed and kept in the archives.
Hand panning using a gold pan is an efficient and very cost effective method for evaluating gold.
Panning can, however present some difficulties with error being inherently high if the panner is
not experienced as gold can be lost if panning is not done vigorously and expertly. Also as
mentioned, if flour gold exists it can be lost through panning despite the addition of detergent and
panning being conducted by an experienced person. As an analytical tool gold panning is best
undertaken in comfortable surroundings preferably in a still, clean pool or in a large tub. The
panning of Matepono samples was conducted at the SOPAC Secretariat by an experienced
technician (Figure14).
Panning concentrate samples provide an immediate visual identification of the presence of gold
and can also provide a rough estimate of grade. With experience, one can get an accuracy of
[TR222 - Lum & Others]
[20]
25% compared to fire assay analysis. A single flake of gold 0.01-0.02mm thick and 0.06-0.09mm
in diameter, a size most frequently found in beach and terrace sands, in a gram of sand
constitutes approximately 1 ppm (Cliffton et al. 1967). A single sphere of gold, of diameter about
0.1 mm and weight about 10 mg will provide an assay of about 0.002ppm gold in a 4 kg sample
(Anon 1994).
Sample Preparation and Analysis
AuguringDepths to 6m
~ r
Samples 4-6 kgsolids and slim e
~
Dry -120 C12 hours
~
Roll & Riffle --panningSplit-1.5kg -
~
FinePulverise200 #
~, 'r150g .MicroscopicSubsample ~ Fire Assay ;"" Examination
Figure 13. Flowchart of sample analysis.
[TR222 -Lum & others]
[21]
Table 2 shows the results of analysis and the panning. Analytical results were undertaken by
Analabs of Fiji. Certified Copies of Analytical Results from Analabs Fiji Ltd are available on file at
Table 2. Results of gold analysis by (i) fire assay and (ii) gold count by hand panning.
!No ! !Value! e !No !h !Value ! e !No ! jValue ! e !
, ,;, :, : : , ;...1 1.23 ~ 2.3 ~ <0.005 1 1 2.370 ~ 5.6 ~ <0.005 1 ~ 4-235 ~ 3.4A 1 <0.005 1 1 1, ,;, :, :' ';' : , ;...~ 1.23 1 3.4 ~ <0.005 1 1 3.42 ~ 0.1 : <0.005 1 1 4.235 ~ 3-48 1 <0.005 1 1, ,;, :, :' ';' : , ; ~1.23 14.5 10.010 1 0 ~3-42 :1.2 1<0.005 ~ 14-235 ~4.5A 1<0.005 1 1
, ,;, :, : : ; 11.325 10.1 1<0,005 ~ ~3.42 12.3 1<0,005 ~ !4.235 14-58 ~<0.005 ~ j
, ,;, :, : , , ; 1 1.325 ~ 1.2 ~ <0.005 1 1 3.42 1 3.4 ~ <0.005 1 ~ 4.235 1 5.6A ~ <0.005 1 1
, ,;, :, :' ';' : , ; : 1.325 1 2.3 : <0.005 1 1 3.42 ~ 4.5A ~ <0.005 1 : 4.235 ~ 5.68 1 <0.005 1 1
, ,;, :, :' ';' : , ; 1 1.370 1 0.1 1 <0.005 1 5 ~ 3.42 j 4.58 1 <0.005 1 1 4-305 : 0.1 1 <0.005 1 !
, ,;, :, : : ; ";11.370 11.2 1<0,005 ~ 1 ~3-42 15.6 1<0,005 ~ 14.305 11.2 !<0.005 ~ :, ,;, :, : , , ; 11.445 10.1 ~0.039 ~ 0 :3-348 10.1 10.292 ~ >20 ~4.305 12.3 ~<0.005: 1
' ';' ' : , , ; ~ 1.445 1 1-2 ~ <0.005: 13-348 1 1.2 ~ <0.005 1 ~ 4.305 1 3.4 ~ <0,005 1 1
' ';' ' :' ';' : , ; ; ~ 1.445 ~ 2.5 ~ <0.005 1 1 3-348 1 2.3 ~ <0.005 1 ~ 4.305 ~ 4.5 1 <0.005 1 1
, ,;, :, :' ';' : , ; ';' ~ 1.445 : 2.3 ~ <0.005 1 1 3.348 ~ 3.4 : <0.005 1 : 4.305 ~ 4-58 1 <0.005 1 !
, ,;, :, :' ';' : ; ';' 11-386 10.1 1<0.005 1 ~3.348 ~4.5 :<0.005 1 14.305 ~5.6 1<0.005 1 ~
, ,;, :, :' ';' : ; ';' 11-386 11.2 1<0,005 1 ~3.348 :5.6 1<0,005 ~ 15.70 10.1 ~<0.005 ~ 1
' ';' ' : ; , , ; ';' !1.386 12.3 1<0,005 ~ 3 ~3.585 10.1 10.016 ~ 0 !5.70 11.2 ~<O,O05 1 1
, ,;, :, : : , ; ';' ~1.386 13.4 10.035 ~ 1 ~3.585 11.2 ~0.014 : 1 ~5.70 12.3 ~<O,O05 1 1
, ,;, :, : : , ; ; ~1.386 14-5A 10.007 ~ 1 ~3.585 12.3 ~0.006 : ~5.70 13.4 ~<0.005 1 1
' ';' ' : : , ; ';' ~1.386 ~4-58 1<0.005 j 3 ~3-585 13-4 ~0.014 1 1 ~5.70 ~4.5 :<0.005 1 ~
, ,;, :, : , , ; ';' :1.386 ~5.6 ~<0.005 1 j3-585 14.5 ~<0.005 1 ~5-70 ~5-6 1<0.005 1 ~
' ';' ' : , , ; ';'...1 2.135 ~ 0.1 ~ <0.005 1 1 3-585 ~ 5.6 ~ <0.005 1 ~ 58.70 ~ 3-4 1 <0.005 1 ~, ,;, :, :' ';' : , ; ';' 12.135 :1.2 1<0.005 1 14.22 ~0.1 ~<0.005 1 j58.70 ~5.6 10.043 ~ 1 :
, ,;, :, :' ';' : , ; ';' 12.135 1 ~<0.005 1 14.24 ~1.2 jO.024 1015.467 10.1 10.184 ~ 8 1
, ,;, :, :' ';' : , ; ';' 1 2.135 1 3.4 ~ <0.005 1 5 1 4-24 ~ 2.3 : <0.005 1 1 5-467 1 1.2 ~ 0.008 : 1
, ,;, :, :' ';' : , ; ; 12.135 14.5 ~<0.005 1 ~4.24 ~3.4 1<0.005 ~ ~5.467 12.3 ~<O,O05 1 1
, ,;, :, : : , ; ';' ~ 2.135 15.6 1 <0.005 1 ~ 4.24 14.5 1 <0.005 ~ ~ 5.467 13.4: 0.005 1 !
, ,;, :, : : , ; ;~ 2-290 ~ 0.1 1 <0.005 1 5 ~ 4.24 1 5.6 1 <0.005 j ~ 5.467 1 4.5 1 <0.005 1 1, ,;, :, : : , ; ';' j 2.290 1 1.2 1 <0.005 1 ~ 4-90 1 0.1 1 <0.005: ~ 5-467 1 5.6 1 <0.005 1 1
, ,;, :, : , , ; ';' ~2.290 12.3 1<0.005 1 ~4.90 11.210.009 1 ~5.535 ~0.1 1<0.005 1 1 1
, ,;, :, : , , ; ';' ~2.290 !3-4 1<0,005 ~ 20 ~4.90 12.3 ~<0.005 1 ~5.535 ~1.2 1<0.005! 1
, ,;, :, : , , ; ';' ~ 2.290 ~ 4.5 A 1 <0,005 ~ 1 ~ 4-90 1 3.4 ~ <0.005 1 ~ 5-535 j 2.3 1 <0.005: 1
, ,;, :, : , , ; ';' ~ 2-290 ~ 4.58 1 <0,005 ~ 14.90 1 4.5 ~ 0.006 1 1 ~ 5.535 ~ 3.4 1 <0.005 j 1
, ,;, :, : , , ; ';' ~ 2.290 ~ 5.6 1 <0,005 ~ ~ 4.90 1 5.6 ~ <0.005 1 8 ~ 5.535 ~ 4.5 1 <0.005 j 1
, ,;, :, : , , ; ';' : 2.370 : 0.1 1 <0.005 ~ ~ 4-290 1 0.1 ~ SNR 1 j 5-535 ~ 4.58 1 <0.005 1 1
, ,;, :, : , , ; ; :2.370 11.2 1<0.005: ~4.235 10.1 ~<0.005 1 1 ~5.535 ~5.6 ~0.008 1 1
, ,;, :, : , , ; ';' [TR222 -Lum & others]
[22]
Figure 14. Hand panning is best done in comfortable surroundings.
the Secretariat. Eleven of 110 samples returned gold values above the detection limit of
0.005 ppm. Only one sample MRA3-348, depth of 0-1 m, contained gold of 0.292ppm which can
be considered as economical. Gold results are reported in parts per million by weight (ppm) -
equivalent to or one gram per tonne. They are not reported in the usual form of milligrams per
cubic metre because of the aim of the survey was only to define the presence or absence of
gold. Commercial laboratories often provide gold results in ppm of gft. Conversation results to
gfm3 can be calculated by the following steps.
Step 1
Weight of gold in panned concentrate
CT
=Weight of gold in the panned concentrate (g)
=Weight of panned heavy mineral concentrate prior to splitting
=Assay result (g/t)
[TR222 -Lum & others]
CTAu = ~.Ar10
[23]
Step 2
Grade of gold in original bulk sample
Au V .0.833
GR = .g / m
GR
Au
V
0.833 = Swell factor correction’
= Grade of gold in original bulk sample (g/m)
= Gold in panned concentrate (g) = Volume of the original sample
All samples were panned and any gold observed during panning was recorded. These samples
together with those that returned values of >0.005 ppm by Analabs were then counted and
examined under a binocular microscope (Table 3). Binocular examination showed that the gold
grains were fine grained, highly crystalline gold with various shapes (globular, flake, wire and
leaf) the majority of which being globular and subjected to little abrasion. Several of the gold
grains still had quartz inclusions contained in them (MRA2-370, 0-1 m and 3-4 m). Gold was
located basically at two horizons, the upper 0-1m interval which contained magnetite, organic
and fine to medium grained sand and the intervals which contained gravel. Sample MRA3-348,
depth 0-1m contained more than 30 irregular grains of gold <0.01 mm in diameter confirming the
high value of 0.292 ppm recorded in the fire assay analysis. Given the high count of gold grains
in the sample, the high value appears to be a true value indication of the sample and is not due
to the nugget effect. Rounded and oxidised pyrite was always associated with gold. Gold grains
were usually globular indicating a short history of transport, most likely to be rapidly transported
down stream during periods of flood and subsequently dumped on the beach.
DISCUSSION
Field
Magnetite beds intersected in the auger holes are generally shallow (< 2 m from surface) and
vary in thickness from a few cm to 25 cm. Magnetite beds are similar to the ones present on the
beach described by Lum et. al. in 1994, they occur as bands with magnetite concentration of up
to 100 percent magnetite. Gravel beds vary in thickness (25 cm to >3 m) and are composed
Assuming that the measured volume of the original sample is 1.2 times the in-situ volume
[TR222 - Lum & Others]
[24]
Table 3. Description of gold grains.
: Auger: Depth i No. of : Description : Geology!: Hole No. : (m) i Gold! of Gold Grains : iI I i Grains i I i
,: MRA 1-23 : 0-1 : 3 i Highly crystalline gold grains, 1 grain flatten to 0.1 mm in diamter and two ! Magnetite and i
: MRA1-370! 1-2 : 1 i Highly crystalline gold grain with a flattish "south Africa" shape grain ! Magnetite and i
~ MRA 1-386: 2-3 ~ 3 : Highly crystalline gold grains with irregular shapes. Gold grain 0.1 mm in j Gravel :
~ MRA1-386 : 4-58 ~ 3 ~ Highly crystalline gold with one flattish and the other irregular in appearance j Gravel ~
: MRA1-386 i 3-4 ! 1 : Highly crystalline gold grain, 1 flat grain gold <0.1mm in diameter Little pyrite i Silt layer :: i ! : present i between :
l 1 1 1 ~ MRA2-290: 4-5 ~ 5 ~ Highly crystalline gold grains, 1 grain flatten (0.1mm) and the rest irregular in ~ Gravel and fine j
! ! ! ! shapes. Flatten grain contains quartz inclusions. Abundance of rounded! grain sand !
i MRA2-370 i 4-5 : 1 : Highly crystalline gold, hollow and globular in shape with little abrasion, .: Gravel and fine i
: MRA2-370: 3-4 ! 20 i Highly crystalline gold, with various shapes, flatten and elongated grains! Gravel !: : i ! were common shapes. The largest piece (0.1 mm) has quartz inclusions. i :! : ! i Gold grains varied from <0.01 mm to 0.1 mm in diameter. Abundance of i :: ~ ~ : rounded and oxidisedPvrite crvstals. : ~, , ..L :'! , ,i MRA2-370: 0-1 : 5 ! Highly crystalline gold, with irregular shapes and averaging 0.01mm in ! Magnetite and:
i : : i diameter. One grain had quartz inclusions. Rounded and oxidised pyrite i medium sand:
~ MRA3-348 j 0-1 ~ >20 ~ Highly crystalline gold grains with irregular shapes. Gold grain <0.1 mm in : Magnetite and i
: MRA3-585: 3-4 ! 1 : Highly crystalline gold grain, 1 globular grain gold <0.1 mm in diameter with i Medium to :! : i ! little pyrite present i coarse grained:
l 1 1 1 i MRA4-235: 3-4 : 1 ! Highly crystalline gold grain and globular in shape. Size <0.01mm in ! Gravel !
~ MRA4-235 j 2-3 ~ 4 ~ Highly crystalline gold grains with irregular shapes. Gold grain 0.1 mm in : Gravel :
~ MRA4-235 i 0-1 : 1 ~ Highlycrystallinegoldgrainwithafiattishappearance<0.01mmindiameter. ~ Magnetite and :
! MRA4-90 : 5-6 i 8 ! Highly crystalline gold with irregular shapes, 2 grains show flattening, sizes: Medium to :i ! : i varied from 0.01 mm to 0.1 mm in diameter. Abundance of rounded and ! coarse grained:
~ MRA4-90 ~ 4-5 ~ 1 j Highly crystalline and 'dinosaur' shaped gold grain. Gold grain 0.1 mm in ~ Gravel j
: MRA5-467 1 0-1 ! 8 : Highly crystalline gold with irregular shaped gold grains. One was wire gold, ! Magnetite and:~ ~ ~ j 2 flat and the rest somewhat globular in shape. Wire gold was approximately j medium sand ~
! MRA5-535! 0-1 ! 1 : Highly crystalline gold grain, 1 irregular 'shark tooth shaped 'grain, 0.1 mm in : Magnetite and:
~ MRA5-70 ~ 5-6 ~ 1 j Highly crystalline gold grain, 1 globular grain gold <0.1mm in diameter with ~ Fine silt :: .
1 i i ~ little nyrite nresent i i, ~ ~ ~ t: [TR222 -Lum & others]
[25]
mainly of sub-rounded to rounded volcanic and quartz gravel (Appendix 2). The volcanic gravels
are mainly basaltic and andestic in composition.
Shallow gravel beds « 3 m from the surface) are also reflected as a vegetation anomaly in the
survey area. Grassland and sparse short vegetation are almost always located above gravel
beds. This is because of poor water retention in gravel beds. Anomalies in swamps and bushland
tend to have a thicker surface sediment layer and deeper gravel beds in comparison to the
grassland.
Figure 15. Sample MRA3-348 showing highly crystalline gold grains with irregular shapes. This samplescontained more than 30 grains of gold.
[TR222 -Lum & others]
[26]
Figure 16. Fine-grained irregular shaped gold grains with quartz inclusions in sample MRA5-535
Magnetite beds (shallow or deep) show no obvious biological or chemical surface anomaly.
It is also worth noting that the bailer was used to extract sediments below the watertable,
although it was highly successful in obtaining sediments at depths up to 6m, the chances of
collecting large gold grains were low.
The nature of gold in the samples was fine grained, and although fine grained gold was expected
(Collins 1993), it is still uncertain whether the sampling technique i.e. the use of the bailer below
the water table, was responsible for this. Nevertheless it was successful in collecting fine-grained
gold in sediments below the water table.
[TR222 -Lum & others]
[27]
Gold Analysis (Fire assay and hand panning)
Apart from the single high value of 0.292 ppm which correlates with the high gold grain count of
>30, there appears to be little correlation between fire assay and hand panning. Eleven of 110
gave gold reading above 0.005ppm for the fire assay technique whilst 22 of 110 showed visible
gold under microscopic examination. Upon examination of the 11 samples which contained gold
by fire assay, 7 confirmed the presence of free gold and the remaining 4 contained no gold.
Sample MRA2-290, 3-4m recorded <0.005ppm gold by fire assay while panning showed the
sample to contain 20 gold grains. Both techniques of gold analysis appears to have problems
which need to be considered in any field survey. The fire assay technique has the gold sparsity
and nugget effect while hand panning losses flour gold. However if done in conjunction gives a
better indication of the evaluation of the survey.
CONCLUSIONS
1. The magnetometer survey was not only successful in defining magnetite beds but also gravel
beds. Gravel beds show a similar but more predominant magnetic signature compared to
shallow magnetic beds.
2. Gravel beds occur a few meters below the upper magnetite beds and vary in thickness from
0.5m to >3m.
3. Placer gold occurs in the sediments of the area investigated to up to depths of 6m (only 6m
tested). Fine grained gold with values of up to 0.292ppm occur in the upper magnetic layer
and in the lower gravels.
4. The survey was technically successful in defining the presence of gold in the area. It was not
designed to identify minable deposits because of the method of sampling, and the limitations
of the gold analysis techniques utilised. If mining targets are required then bulk testing
followed by pilot testing of selective sites are essential.
[TR222 - Lum & Others]
[28]
RECOMMENDATIONS
1. Because of the sampling and analytical problems associated with alluvial gold evaluation,
large bulk testing of sites MRA3-585, MRA4-90, MRA5-467 and MRA3-349 should be
considered. One cubic meter samples of the upper 0-1m of magnetic beds and the lower
gravel beds should be collected by pitting. Samples then sieved through coarse mesh wires
and subsequently carefully reduced to their heavy mineral fraction. The mineral concentrate
should then be sent in for gold analysis (fire assay and bulk cyanide leaching) and
microscopic examination , If small concentrators are available eg. Keene super high banker
Combos, these should be used.
2. With the presence of gold in the surficial sediments, an obvious target where gold could be
concentrated will be in buried channels. A ground seismic survey could identify these buried
channels.
[TR222 - Lum & Others]
[29]
BIBLIOGRAPHY
Anon, Mineral Exploration Sampling 1994. Australian Laboratory Services, Brisbane, Mineral Division News,
Australian Photogeological Consultants, 1984. Photomorphological Investigation, Possible littoral Reconcentration of Alluvial Gold, lower reaches of the Matepono River, Guadalcanal, Solomon Islands Open File, Solomon islands Geological Survey, Unpublished,
Carter, R. 1986. Baseline Oceanographic Data Collection and Analysis from off Lungga Point in Tenary Bay, Guadalcanal, Solomon Islands-Hurricane and Flooding Frequency in the Lungga Delta Area. CCOP/SOPAC Technical Report 67.
Clifton, H.E., Hubert,A., Phillips, R.L. 1967. Marine sediment sample preparation for the analysis for low concentrations of fine detrital gold. Washington, USGPO, Geological Survey Circular 545.
Collins, W. 1993. Gold Potential at the Matepono River Mouth and Adjacent Areas. SOPAC Technical Report 164.
Gillie, R.D. 1992. Randi Beach Coastal Erosion Study Honiara, Guadalcanal Solomon Islands. SOPAC technical Report 152
Grover, J.C. 1955. The Sorvohio Valley Alluvial Flats, Guadalcanal. In: Geology, Mineral Deposits and Prospects of Mining Development In The British Solomon Islands Protectorate, Ch. 22 p78-79. Interim Memoir Geological Survey British Solomon Islands. I, 108.
Assays and Future Prospect. In:The Solomon Islands-Geological Exploration and Research, (1953- 1956), p63-80. Memoir Geological Survey British Solomon Islands., 2, 151p.
Hackman, B.D. 1980. The Geology of Guadalcanal, Solomon islands, Overseas memoir, Institute of Geological sciences, 6: 115 p.
Kinhill Engineers Pty Ltd. 1990. Gold Ridge Mines Ltd, Gold Ridge Engineering Feasibility Study, Technical Report and Costs. Confidential report, Ministry of Energy, Water, & Mineral Resources, Solomon Islands.
(ed). Cenozoic Tectonic Development of the Southwest Pacific. UN ESCAP, CCOP/SOPAC Technical Bulletin 6, p47-61.
Landmesser, C.W. 1977. Evaluation of Potential Hydrocarbon Occurrence in the Solomon islands, South Pacific marine Geological notes, 1(5): 47-53, CCOP/SOPAC Technical Secretariat, Suva.
Lum, J. 1993. Field Visits to Kele and Matepono Rivers in the Solomon Islands and Big Bay in Vanuatu. SOPAC Preliminary Report 57.
Lum, J., Clark, A.L., and Coleman, P.J. 1991. Gold Potential Southwest Pacific, Papua New Guinea, Solomon islands, Vanuatu and Fiji. East-West Center, Honolulu Hawaii.
Lum, J., de Biran, A., Andrew, D., Toba, T. 1994. Gold potential at the Matepono River mouth and adjacent areas, Solomon Islands - a magnetometer survey, Volume 1. SOPAC Technical Report 213.
Lum, J., Michael, D., Leanamae, I., Sato, W., Motuiwaca, S., Ratu, S. 1995. Gold potential at the Matepono River mouth and adjacent areas, Solomon Islands an augering program. SOPAC Preliminary Report 79.
Islands. CCOP/SOPAC Technical Report 61.
Geological Record. 2 1959-1962, p 107-113.
shelf, Northern Guadalcanal, Solomon islands. South Pacific Marine Geological Notes Volume 1, Number 6: 55-69, CCOP/SOPAC
Guadalcanal. Solomon Islands Geological Survey Report. 48p.
Solomon islands. DP/SF?UN British Solomon Islands(UK)
Vol 3 No.5.
Grover, J.C. 1958. Gold Ridge, Guadalcanal-Discovery of Gold Bearing Bodies, Implication of Sample
Kroenke, L.W. 1984. Solomon Islands, San Cristobal toBougainville and Buka, Ch. 4, In: kroenke, L.W.
Roy, P.S., 1990. Quaternary Geology of the Guadalcanal Coastal Plain and Adjacent Seabed, Solomon
Stanton, R.L. 1965. Gold: Alluvial Deposits of the Sorvohio River, Guadalcanal. British. Solomon Islands
Turner, C.C., Eade, J.V., Danitofea, S. and Oldnall, R. 1977. Gold Bearing Sediments on the Continental
Walshaw, R.B. 1974. A Geochemical Investigation of Gold Bearing Volcanic Rudites at Gold Ridge,
United Nations Development Programme, 1969. Aerial Geophysical and Mineral Surveys in the British
[TR222 - Lum & Others]
[30]
[TR222 - Lum & Others]
[31]
APPENDIX 1
Logs of Auger Holes MRA1, MRA2, MRA3, MRA4 and MRA5
[TR222 - Lum & Others]
[32]
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[TR
222 -Lum
& others]
[40]
MRA1 -325m
PIT
0:.- :- --=- -muddy sand with organic material
'..o. o. 0, O' .
: .:: 0": 0.: : 00: 0,: : 0' : ..fine-grained sand with no visible magnetiteCI) 1 .0 0 ,0 00 " 0" ,~ 0, 0" 0" " ..-Q) 0 , 0 .0..E : .,' .0": 0." .00: 0": ..
.~ :£: ..,.., ,.0" water table
'i!; 0... ...".. d coarse-grained sand with pebbles2 . f "
concentration 0 magnetite up to 100% pure
gravel with volcanic rounded pebblespebbles are basalt and andesite also presentare milky quartz pebbles
3M 1m ~
[TR222 -Lum & others]
[41]
APPENDIX 2
Total Intensity Data and Distance of lines MRA1, MRA2, MRA3, MRA4 and MRA5
[TR222 - Lum & Others]
[42]
LINE MRA1D nT D nT D nT D nT D nT D nT D nT
0 40778 106 40731 212 40729 318 40578 424 40524 530 40654 636 40753
2 40780 108 40734 214 40736 320 40478 426 40710 532 40671 638 40752
4 40775 110 40726 216 40729 322 40572 428 40920 534 40677 640 40750
6 40776 112 40730 218 40735 324 41657 430 40726 536 40688 642 40750
8 40780 114 40768 220 40754 326 40754 432 40589 538 40718 644 40757
10 40776 116 40763 222 40762 328 40876 434 40621 540 40765 646 40756
12 40777 118 40700 224 40784 330 40700 436 40749 542 40744 648 40749
14 40781 120 40669 226 40777 332 40739 438 40739 544 40710 650 40750
16 40795 122 40660 228 40712 334 40770 440 40706 546 40745 652 40752
18 40822 124 40676 230 40720 336 40747' 442 40773 548 40731 654 40755
20 40857 126 40686 232 40742 338 40281 444 40906 550 40702 656 40758
22 40798 128 40700 234 40741 340 40702 446 41024 552 40764 658 40758
24 40549 130 40712 236 40742 342 40732 448 41165 554 40794 660 40754
26 40594 132 40722 238 40741 344 40732 450 41191 556 40764 662 40745
28 40684 134 40732 240 40748 346 40736 452 41170 558 40757 664 40738
30 40696 136 40736 242 40748 348 40720 454 40649 560 40734 666 40739
32 40718 138 40740 244 40760 350 40697 456 40105 562 40598 668 40742
34 40742 140 40741 246 40759 352 40714458 40429 564 40700 ~70 40745
36 40749 142 40743 248 40750 354 40739 460 40776 566 40763 672 40749
38 40768 144 40750 250 40747 356 40766 462 40608 568 40785 674 40750
40 40821 146 40754 252 40736 358 40783 464 40266 570 40731 676 40743
42 40759 148 40746 254 40728 360 40796 466 40350 572 40706 678 40734
44 40725 150 40743 256 40729 362 40812 468 40578 574 40715 680 40735
46 40714 152 40747 258 40730 364 40822 470 40766 576 40702 682 40731
48 40724 154 40762 260 40739 366 40823 472 40867 578 40679 684 40730
50 40739 156 40763 262 40746 368 40809 474 40836 580 40689 686 40727
52 40739 158 40782 264 40744 370 40801 476 40916 582 40723 688 40728
54 40731 t60 40811 266 40746 372 40796 478 41049 584 40740 690 40733
56 40729 162 40756 268 40754 374 40806 480 41224 586 40752 692 40734
58 40706 164 40732 270 40764 376 40803 482 41299 588 40755 694 40731
60 40693 166 40741 272 40762 378 40817 484 41196 590 40759 696 40730
62 40703 168 40747 274 40760 380 40826 486 40984 592 40760 698 40721
64 40642 170 40768 276 40756 382 40855 488 40725 594 40759 700 40720
66 40666 172 40769 278 40757 384 40894 490 40572 596 40761 702 40724
68 40644 .174 40764 280 40766 386 40918 492 40792 598 40759 704 40745
70 40640 176 40790 282 40774 388 40926 494 40578 600 40765 706 40736
72 40662 178 40786 284 40779 390 40954 496 40291 602 40764 708 40729
74 40712 180 40774 286 40778 392 40833 498 40462 604 40760 710 40721
76 40736 182 40783 288 40785 394 40814 500 40702 606 40758 712 40725
78 40756 184 40751 290 40793 396 40758 502 40934 608 40756 714 40725
80 40755 186 40715 292 40800 398 40620 504 41050 610 40753 716 40726
82 40748 188 40716 294 40803 400 40640 506 41036 612 40752 718 40720
84 40758 190 40738 296 40799 402 40666 508 40756 614 40750 720 40725
86 40796 192 40747 298 40795 404 40733 510 40614 616 40747 722 40725
88 40822 194 40750 300 40792 406 40829 512 40486 618 40739 724 40723
90 40832 196 40769 302 40781 408 40895 514 40229 620 40744 726 40720
92 40788 198 40777 304 40790 410 40904 516 40202 622 40741 728 40722
94 40721 200 40722 306 40859 412 40823 518 40441 624 40743 730 40720
96 40589 202 40695 308 40564 414 40688 520 40695 626 40739 732 40717
98 40570 204 40730 310 40862 416 40742 522 40780 628 40744 734 40705
100 40629 206 40743 312 40891 418 40723 524 40739 630 40740 736 40709
102 40629 208 40715 314 40898 420 40834 526 40684 632 40744 738 40707
104 40696 210 40692 316 40817 422 40614 528 40668 634 40740
[TR222 -Lum & others]
[43]
LINE MRA20 nT 0 nT 0 nT 0 nT 0 nT 0 nT 0 nT
0 40790 115 40753 332 40724 438 40595 544 40799 650 40749 756 40760
2 40792 120 40769 334 40703 440 40593 546 40802 652 40748 758 40756
4 40803 125 40779 336 40762 442 40585 548 40799 654 40746 760 40749
6 40815 130 40841 338 40792 444 40625 550 40788 656 40752 762 40750
8 40804 135 40707 340 40806 446 40695 552 40774 658 40768 764 40744
10 40782 140 40676 342 40826 448 40790 554 40772 660 40774 766 40733
12 40764 145 40734 344 40837 450 40841 556 40786 662 40779 768 40729
14 40740 150 40766 346 40831 452 40835 558 40794 664 40786 770 40729
16 40755 155 40766 348 40826 454 40807 560 40786 666 40791 772 40724
18 40777 160 40767 350 40826 456 40816 562 40775 668 40785 774 40720
20 40787 165 40794 352 40878 458 40797 564 40759 670 40782 776 40725
22 40784 170 40787 354 40922 460 40727 566 40761 672 40770 778 40730
24 40789 175 40755 356 40922 462 40702 568 40762 674 40755 780 40729
26 40763 180 40777 358 40871 464 40730 570 40770 676 40722 782 40735
28 40713 185 40752 360 40903 466 40766 572 40762 678 40700 784 40738
30 40735 190 40748 362 40921 468 40756 574 40760 680 40693 786 40743
32 40790 195 40760 364 40879 470 40685 576 40770 682 40695 788 40750
34 40772 200 40719 366 40867 472 40736 578 40n1 684 40696 790 40753
36 40680 205 40725 368 40946 474 40767 580 40781 686 40701 792 40750
38 40730 210 40809 370 41042 476 40801 582 40784 688 40714 794 40753
40 40796 215 40792 372 40944 478 40840 584 40785 690 40719 796 40764
42 40859 220 40709 374 40666 480 40656 586 40789 692 40722
44 40825 225 40790 376 40747 482 40489 588 40728 694 40725
46 40781 230 40747 378 41045 484 40583 590 40772 696 40728
48 40753 235 40798 380 41005 486 40619 592 40751 698 40733
50 40760 240 40762 382 40597 488 40609 594 40748 700 40745
52 40733 245 40788 384 40141 490 40583 596 40738 702 40753
54 40693 250 40812 386 40330 492 40613 598 40729 704 40750
56 40729 255 40728 388 40770 494 40685 600 40734 706 40746
58 40815 260 40780 390 40537 496 40704 602 40751 708 40744
60 40691 265 40772 392 40321 498 40706 604 40745 710 40735
62 40684 270 40807 394 40379 500 40680 606 40731 712 40736
64 40680 275 40806 396 40527 502 40694 608 40745 714 40742
66 40654 280 40742 398 40820 504 40689 610 40750 716 40738
68 40552 285 40858 400 40871 506 40754 612 40708 718 40737
70 40605 290 40925 402 40634 508 40782 614 40756 720 40748
72 40663 295 40783 404 40558 510 40783 616 40751 722 40765
74 .40725 300 40622 406 40564 512 40780 618 40745 724 40797
76 40700 302 40590 408 40763 514 40794 620 40745 726 40815 !
78 40719 304 40626 410 40932 516 40789 622 40747 728 40817
80 40725 306 40723 412 41064 518 40801 624 40738 730 40812
82 40726 308 40763 414 40995 520 40800 626 40733 732 40804
84 40746 310 40753 416 40872 522 40796 628 40728 734 40783
86 40747 312 40774 418 40853 524 40795 630 40733 736 40771
88' 40736 314 40792 420 40903 526 40795 632 40738 738 40753
90 40728 316 40803 422 40775 528 40794 634 40745 740 40749
92 40725 318 40813 424 40786 530 40788 636 40736 742 40745
94 40744 320 40816 426 40723 532 40785 638 40732 744 40734
96 40742 322 40831 428 40610 534 40792 640 40730 746 40736
98 40755 324 40837 430 40638 536 40796 642 40723 748 40748,
100 40767 326 40856 432 40659 538 40803 644 40731 750 40760 --105 40752 328 40822 434 40703 540 40795 646 40733 752 40764 -
110 40754 330 40736 436 40668 542 40805 648 40746 754 40757
[TR222 -Lum & others]
[44]
LINE MRA3
D nT D nT D nT D nT D nT D nT D
0 40826 106 40796 212 40842 318 40981 424 40775 530 40835 636
2 40819 108 40799 214 40878 320 40920 426 40802 532 40842 638
4 40820 110 40812 216 40894 322 40856 428 40906 534 40846 640
6 40822 112 40806 218 40838 324 40890 430 40924 536 40840 642
8 40802 114 40777 220 40803 326 40936 432 40864 538 40848 644
10 40780 116 40792 222 40804 328 40861 434 40806 540 40850 646
12 40787 118 40794 224 40808 330 40839 436 40749 542 40861 648
14 40801 120 40793 226 40817 332 40919 438 40707 544 40861 650
16 40807 122 40793 228 40843 334 40889 440 40689 546 40852 652
18 40816 124 40796 230 40854 336 40878 442 40708 548 40864 654
20 40836 126 40802 232 40858 338 40846 444 550 40876 656
22 40854 128 40800 234 40844 340 40931 446 40591 552 40895 658
24 40863 130 40797 236 40851 342 41114 448 40500 554 40902 660
26 40812 132 40804 238 40863 344 41190 450 40565 556 40894 662
28 40710 134 40806 240 40868 346 41215 452 40665 558 40859 664
30 40787 136 40813 242 40863 348 40757 454 40738 560 40833 666
32 40829 138 40816 244 40881 350 40295 456 40783 562 40815 668
34 40836 140 40807 246 40891 352 40100 458 40800 564 40805 670
36 40926 142 40819 248 40899 354 40216 460 40797 566 40812 672
38 40985 144 250 40914 356 40580 462 40810 568 40821 674
40 40979 146 40824 252 40925 358 40822 464 40823 570 40835 676
42 40719 148 40817 254 40860 360 40862 466 40836 572 40856 678
44 40640 150 40822 256 40830 362 40846 468 40840 574 40880 680
46 40594 152 40828 258 40825 364 40855 470 40845 576 40925 682
48 40634 154 40838 260 40830 366 40850 472 40851 578 40973 684
50 40664 156 40853 262 40851 368 40809 474 40848 580 40929 686
52 40703 158 40852 264 40834 370 40743 476 40850 582 41020 688
54 40773 160 40838 266 40833 372 40738 478 40844 584 41042 690
56 40825 162 40805 268 40769 374 40785 480 40836 586 40833 692
58 40835 164 40790 270 40635 376 40845 482 40828 588 40621 694
60 40840 166 40818 272 40731 378 40870 484 40824 590 40506 696
62 40882 168 40830 274 40794 380 40917 486 40823 592 40652 698
64 40869 170 40812 276 40818 382 40992 488 40818 594 40767 700
66 40770 172 40838 278 40839 384 40926 490 40814 596 40769 702
68 40702 174 40856 280 40844 386 40775 492 40822 598 40743 704
70 40687 176 40844 282 40841 388 '40741 494 40824 600 40724 706
72 40714 178 40803 284 40843 390 40736 496 40819 602 40786 708
74 40757 180 40879 286 40851 392 40724 498 40829 604 40831 710
76 40793 182 40826 288 40856 394 40701 500 40833 606 40784 712
78 40762 184 40839 290 40869 396 40738 502 40845 608 40807 714
80 40764 186 40858 292 40882 398 40773 504 40846 610 40795 716
82 40774 188 40855 294 40888 400 40813 506 40838 612 40740 718
84 40780 190 40886 296 40857 402 40820 508 40828 614 40729 720
86 40781 192 40830 298 40833 404 40799 510 40829 616 40790 722
88 40784 194 40793 300 40835 406 40819 512 40831 618 40813 724
90 40786 196 40777 302 40844 408 40839 514 40830 620 40838 726
92 40796 198 40783 304 40863 410 40836 516 40826 622 40758 728
94 40801 200 40786 306 40880 412 40831 518 40827 624 40676 730
96 40801 202 40802 308 40874 414 40817 520 40838 626 40637 732
98 40805 204 40840 310 40839 416 40801 522 40830 628 40669 734
100 40807 206 40849 312 40866 418 40777 524 40825 630 40738-, 736
102 40798 208 40856 314 40913 420 40748 526 40827 632 40778 738
104 40792 210 40837 316 40959 422 40769 528 40836 634 40813 740
[TR222 -Lum & others]
[45]
LINE MRA3
nT -D nT D nT .
40800 742 40825 848 40805
40816 744' 40819 850 40806
40766 746 40813 852 40807
40743 748 40809 854 40804 '
40758 750 40802 856 40805
40773 752 40800 858 40810
40791 754 40797 860 40813
40749 756 40799 862 40810
40695 758 40779 864 40809
40820 760 40793 866 40801
40835 762 40786 868 4080140836 764 40791 870 40807 .
40839 76& 40797 872 40806 ,
40838 ,768 40798 874 40813
40836 770 .40801 876 40811
40840 772 40809 878 40809
40840 774 40818 880 40809
40839 776 4081'9 882 '40810 '.
40849 778 40820 884 40805 '40848 780 40819 886 40801 .
40842 782 40824 888 40802
40841 784 40827 890 40798
40842 786 40821 892 40806
40839 788 40809 894 40805
40845 790 40807 896 40801
40847 792 40801 898 40803
40848 794 40803 900 40800
40840 796 40821
40839 798 40824
40940 800 40820
40828 802 40825
40828 804 40830
40823 806 40831
40825 808 40827
40822 810 40816
40812 812 40818
40813 814 40813
40807 816 40818
40807 818 40824
40810 820 40823.40812 822 40813
40816 824 40819
40831 826 40819
40838 828 40818
40838 830 40820
40841 832 40811
40840 834 40817
40828 836 40806
40827 838 40802
40826 840 4080340824 842 40802 -
40824 844 40801
40828 846 40804 --
[TR222 -Lum & others]
[46]
.LINE MRA40 40847 106 40856 212 40851 318 40769 424 40824 530 40856 636
2 40850 108 40855 214 40855 320 40645 426 40825 532 40878 638
4 40874 110 40862 216 40889 322 40442 428 40827 534 40891 640
6 40924 112 40834 218 40926 324 40343 430 40831 536 40909 642
8 .40919 114 40823 220 40900 326 40439 432 40820 538 40913 644
10 40785 116 40802 222 40929 328 40504 434 40819 540 40919 646
12 40m 118 40845 224 41007 330 40590 436 40825 542 40922 648
14 _40939 120 40852 226 41042 332 40668 438 40827 544 40928 650
16 40998 122 40832 228 40908 334 40705 440 40837 546 40956 652
18. 41004 124 40793 230 40889 336 40735 442 40835 548 40951 654
20 40848 126 40792 232 41083 338 40768 444 40828 550 40944 656
22 40508 128 40794 234 41036 340 40795 446 40844 552 40946 658
24 40772 130 40799 236 40303 342 40820 448 40858 554 40961 660
26 40654 132 40797 238 40246. 344 40848 450 40850 556 40968 662
28 40761 134 40825 240 40513 346 40867 452 40862 558 40973 664
30 40784 136 40824 242 40664 348 40877 454 40871 560 40924 666
32 40808 138 40834 244 40797 350. 40888 456 40884 562 40858 668
34 40797 140 40822 246 40842 352 40883 4~ 40885 564 40829 670
36 40705 142 40843 248 40861 354 40873 460 40874 566 40828 672
38 40572 144 40834 250 40856 356 40874 462 40875 568 40843 674
40 40619 146 40807 252 40840 358 40869 464 40902 570 40875 676
42 40670 148 40803 254 40850 360 40865 466 40940 572 40892 678
44 40720 150 40803 256 40876 362 40872 468 40951 574 40905 680
46 40782 152 40319 258 40883 364 470 40930 576 40929 682
48 40847 154 40829 260 40885 366 472 40858 578 40910 684
50 40819 156 40834 262 40906 368 474 40786 580 40891 686
52 40821 158 40824 264 40866 370 476 40814 582 40856 688
54 40822 160 40818 266 40846 372 40932 478 40808 584 40775 690
56 40826 162 40817 268 40873 374 40877 480 40859 586 40801 692
58 40823 164 40834 270 40923 376 40843 482 40838 588 40823 694
60 40824 166 40842 272 40912 378 40850 484 40734 590 40811 696
62 40824 168 40851 274 40865 380 40853 486 40783 592 40753 698
64 40816 170 40843 276 40824 382 40851 488 40613 594 40553 700
66 40823 172 40841 278 40764 384 40827 490 40462 596 40433 702
68 40808 174 40825 280 40685 386 40807 492 40540 598 40529 704
70 40815 176 40832 282 40644 388 40823 494 40604 600 40693 706
72 40819 178 40849 284 40774 390 40829 496 40748 602 40808 708
74 40789 180 40865 286 40840 392 40826 498 40863 604 40841 710
76 40792 182 40883 288 40847 394 40825 500 40849 606 40831 712
78 40782 184 40857 290 40828 396 40837 502 40824 608 40878 714 I
80 40793 186 40816 292 40836 398 40845 504 40808 610 40889 716
82 40806 188 40627 294 40857 400 40848 506 40804 612 40799 718
84 40814 190 40637 296 40904 402 40845 508 40824 614 40749 720
86 40814 192 40757 298 40990 404 40858 510 40841 616 40752 722
88 40822 194 40788 300 41142 406 40841 512 40843 618 40752 724
90 40826 196 40751 302 41256 408 40815 514 40843 620 40751 726
92 40832 198 40750 304 41316 410 40801 516 40832 622 40736 728
94 40833 200 40772 306 41281 412 40801 518 40817 624 40737 730
96 40836 202 40784 308 40997 414 40799 520 40815 626 40753 732
98 40839 204 40815 310 40693 416 40797 522 40820 628 40819 734
100 40843 206 40820 312 40756 418 40795 524 40825 630 40876 736
102 40834 208 40841 314 40745 420 40806 526 40820 632 4091~ 738
[TR222 -Lum & others]
[47]
LINE MRA440975 742 40847 848 40807 954 40815
40996 744 40857 850 40780 956 40811
40983 746 40854 852 40773 958 40820
40956 748 40842 854 40822 960 40833 ,
40905 750 40844 856 40865 962 40844
40831 752 40835 858 40862 964 40847
40791 754 40838 860 40782 966 40834
40789 756 40842 862 40765 968 40840
40836 758 40843 864 40854 970 40855
40870 760 40853 866 40910 972 40863
40878 762 40851 868 40886 974 40862
40875 764 40850 870 40802 976 40867
40799 766 40856 872 '40752 978 40864
40713 768 40858 874 40758 980 40860
40661 770 40869 876 40746 982 40851
40644 772 40882 878 40767 984 40829
40700 774 40902 880 40811 986 40800
40767 776 40920 882 40849 988 40808 .
40841 778 40896 884 40888
40877 780 40867 886 40902
40890 782 40844 888 40897 '
40887 784 40808 890 40894
40901 786 40801 892 40861
40907 788 40812 894 40811 -,
40932 790 40780 896 40819
40976 792 40781 898 40822
40963 794 40796 900 40837
40867 796 40814 902 40842
40767 798 40830 904 40832
40701 800 40826 906 40825
40764 802 40843 908 40827
40914 804 40870 910 40835
41008 806 40910 912 40840
41081 808 40935 914 4083541062 810 40932 916 40829 ,-
41011 812 40901 918 40826
40965 814 40868 920 40822
40893 816 40795 922 40828
40781 818 40735 924 40830
40699 820 40753 926 40837
40607 822-40797 928 40840
40660 824 40819 930 40847
40738 826 40852 932 40840
40712 828 40869 934 40829
40656 830 40879 936 40823
40618 832 40892 938 40821
40568 834 40906 940 40828
40683 836 40927 942 40834
40643 838 40950 944 40838
40729 840 40954 946 4083840763 842 40932 948 40834 -
40791 844 40904 950 40830
[TR222 -Lum & others]
Recommended
