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3416
1010
90
1729
2225 13
15 3240
48
24
6818
3016 8
3620
1016 16
18
18
14
817
1212
18
70
38
3020
15
2322
20
35
19
12
3248
9056
40
28
4020
9075
80
56
90
1814
18 13 4860
60
86 60
90
80
76
6038
40
24 36
32
25
26
708586
30
90
3516
87
6060
6864
82
86
8686
88
25
76
20 4234
3028
48
60
6670
4032
2856
3626
65
56
45
16
18
88
36
2835
5440
4032
3745
3826
24 35
27
12
10
23
1310
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10
10
20
19
48
52
38
44
1540
331525
3580
40
66
32
39
58
1925
NEIL
BOOT
LAD
ROBB LAKE
3010 2030
15
35
30
30
40
15
10
3014
25
202634
1635 204318
18 10
22
10
15
1526
35
15
18
2536
30
33
37
20 22
21
40
20
2429
22
30
30
30
35
24
30
3122
4244
44
20
15
2848
35
361400
1400
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3
Geological Survey BranchGeoscience Map 2000-9
GEOLOGY OF MOUNT MCCUSKER-ROBB LAKE AREA,
NORTHEASTERN BRITISH COLUMBIA
NTS 94G/4Wby Andrew Legun, JoAnne Nelson and Mike Cecile
SCALE 1:50 000
4 5
MIDDLE TO EARLY? SILURIAN
Sb
Sn
Osk
Ob
MIDDLE ORDOVICIAN
LATE ORDOVICIAN
EARLY SILURIAN
EARLY ORDOVICIAN
Ok
WOKKPASH MEMBERDiscontinuous. Cross-bedded dolomitic sandstone and quartzite. It is a discrete unit in the footwall of the Gautschi thrust (about 20 m. thick). Absent in ridge stratigraphy drained by Embree, Bartle and Sidenius Creeks. Towards Colledge Creek it is exposed as 50 mtres of quartzite in an anticlinal arch. Further east about 60 metres noted at Mt. Bertha by Taylor (1970).
MUNCHO-MCCONNELL FORMATIONMedium to thick bedded cream dololutites and cryptalgal laminites with scattered (aeolian?) quartz grains.
QUARTZITE MARKER UNITTwenty to fifty metres of crossbedded and horizontally laminated quartz arenites interbedded with pale dolostones and sandy dolostone. Irregular upper contact of some dolostones suggest interstratal diastems. Single beds of quartzite are up to 10 metres thick, normally 2 to 5 metres thick.
BEAVERFOOT FORMATIONIn the northeast a platformal facies of laminated to cross-bedded quartz arenite, orange arenaceous dolostone overlies reddish and brown dolomitic siltstones. Uppermost beds evidence periods of exposure and include dololutite with mudcracks, a discontinuous dolomite breccia with hematite nodules, granule quartzite. To south and west there is a sharp (shelf to basin) lithological transition to dolomitic shales, quartz turbidites, banded cherty and dolomitic siltstones, pyritic shale, black shale.
BASAL SILURIAN UNITPlaty calcareous shale, minor nodular dolomitic limestone, laminated dolomitic siltstone. Upper beds include small bioherms and bioclastic lenses interbedded with and transitional to massive shelf dolostones of overlying Nonda facies.
NONDA FORMATIONGrey to dark grey, medium bedded dolostone, cherty and silicified dolostone. Occasional biostromal and bioclastic beds with crinoids, brachiopods, stromatoporoids.
STONE FORMATIONPale unfossiliferous dolostone, alternating pale grey and white dolostone, minor granular crystalline dolostone.
SKOKI FORMATIONMedium to thick beds of dark grey to tan dolostone with oncolites, pisolites, planispiral gastropods and solitary corals (Bighornia). Beds with grazing trails and bioturbation structures are common. Upper beds are cherty in some areas (eg. north side of Sidenius Creek). Massive beds with few oncolites and fossils typify exposures on the north side of Sikanni Chief River.
KECHIKA GROUPThin bedded, putty colored, calcareous and dolomitic slate and shale. Minor interbeds of thin limestone. Uppermost beds are thicker and more dolomitic. Normally a strong cleavage obscures bedding characteristics.
BESA RIVER FORMATIONEastern facies varying from light brown to dark grey weathering shale, minor calcareous shale.
Geological boundary (defined, approximate, inferred) ...........................
Thrust fault; teeth in upper plate (defined, approximate, inferred) .........
Normal fault; downthrown side indicated (defined, approximate) ...........
Fault, uncertain or unknown type (defined, approximate) ......................
Bedding (inclined,overturned,vertical) ...................................................
Cleavage .............................................................................................
Axial trace of overturned antiform, synform (arrow indicates plunge) ....
Axial trace of upright antiform, synform (arrow indicates plunge) ...........
Fossil sample locality (macrofossil, conodant) ......................................
Minfile occurrence; developed prospect, prospect, showing....................
Cross-section line ................................................................................
Topographic contour (100 metre interval) .............................................
Geochemical analysis site ....................................................................
Area of Outcrop ....................................................................................
Robb Lake breccia, other breccias (coarser, more rounded fragments) ..
10 Kilometres2
F
A B
C
LATE SILURIAN AND EARLY DEVONIAN
Barnes, C. R. and Pyle L.J. (1999): Lower Paleozoic stratigraphy and conodont biostratigraphy, platform to basin transect, in the Trutch, Halfway River and Ware map areas (94G,B,F), northeastern British Columbia; Geological Survey of Canada, Central Forelands Natmap Project 1999, Fall workshop Program and Abstracts, edited by Larry S. Lane.
Cecile, M.P. (2000): Geology of Mt. McCusker area-east half, northeastern British Columbia; Geological Survey of Canada, publication pending.
Cecile, M.P. and Norford, B.S. (1979): Basin to platform transition, lower Paleozoic strata of Ware and Trutch areas, northeastern British Columbia; Geological Survey of Canada, Paper 79-1A, p. 219-226.
Jones, H. and Dujardin, R. (1973): Geological and geochemical report on the RB/DEV/JUNE group, Mt. Bertha; B.C. Ministry of Energy and Mines, Mineral Assessment report 4090, 8p.
Legun, A. (2000): Geology of the Mount McCusker-Robb Lake area, northeastern British Columbia; B.C. Ministry of Energy and Mines, Geological Fieldwork 1999, Paper 2000-1, pages 147-156.
MacQueen , R.W. and Thompson, R.J. (1978): Carbonate-hosted lead-zinc occurrences in northeastern British Columbia with emphasis on the Robb Lake deposit; Canadian Journal of Earth Sciences, volume 15, p. 1737-1762.
Mann, F.T. (1981): Stratigraphic aspects of the Silurian-Devonian sequence hosting zinc and lead mineralisation near Robb Lake, northeastern British Columbia; unpublished Ph.D. thesis, University of Toronto, 252p.
McHale, K.B. and Pearson, B.D. (1974): Geological and geochemical report McCusker claim groups I,II and III, Liard/Omineca Mining Division; B.C. Ministry of Energy and Mines, Mineral Assessment report 4865, 64p.
Morrow, D.W. (1978): The Dunedin Formation: a transgressive shelf carbonate sequence; Geological Survey of Canada, Paper 76-12, 35 p.
Needoba, J. (1973): Geological and geochemical report on the Inbe group; B.C. Ministry of Energy and Mines, Mineral Assessment report 44622, 10p.
Nelson, J.L., Paradis, S., Zantvoort, W. (1999): The Robb Lake carbonate-hosted lead-zinc deposit, northeastern British Columbia: A Cordilleran MVT Deposit; B.C. Ministry of Energy and Mines, Geological Fieldwork 1998, Paper 1999-1, p.89-101.
Norford, B.S. (1991): Ordovician and Silurian stratigraphy, paleogeography and depositional history in the Peace River Arch area, Alberta and British Columbia; Bulletin of Canadian Petroleum Geology, Volume 38A, p. 45-54.
Norford, B.S., Gabrielse, H. and Taylor, G.C. (1966): Stratigraphy of Silurian carbonate rocks of the Rocky Mountains, northern British Columbia; Bulletin of Canadian Petroleum Geology, Volume 14, p. 504-519.
Pearson, B. and McHale B. (1974): Geological and geochemical report J.R. claims group A and B, B.C. Ministry of Energy and Mines, Mineral Assessment report 4886, 11p.
Riddell, C.H. (1972): Surface geology, McCusker Area, northeastern British Columbia; B.C. Ministry of Energy and Mines, Petroleum Assessment report 1761, 51 p.
Salat, H. (1973): Geological and geochemical survey Tri claims; B.C. Ministry of Energy and Mines, Mineral Assessment report 4692, 15p.
Taylor, A.H. (1977): Carbonate stratigraphy and petrology: Robb Lake zinc-lead property, northeastern British Columbia; unpublished M.Sc thesis, Carleton University.
Taylor, G.C. (1979): Trutch (94G) and Ware east half (94F, E1/2) map-areas, northeastern British Columbia; Geological Survey of Canada, Open File Report 606.
Taylor, G.C. and Mackenzie, W.S. (1970): Devonian stratigraphy of northeastern British Columbia; Geological Survey of Canada, Bulletin 186, 62p.
Tebbut, G.E. (1970): Surface geology, Trimble area; B.C. Ministry of Energy and Mines, Petroleum Assessment report 1551.
Thompson, R.I. (1989): Stratigraphy, tectonic evolution and structural analysis of the Halfway River map area (94B), northern Rocky Mountains, British Columbia; Geological Survey of Canada, Memoir 425,119 p.
Williams, M.G. (1975): Geological and geochemical report, LAD, LASS and EL DORADO mineral claims, Liard/Omineca Mining Division; B.C. Ministry of Energy and Mines, Mineral Assessment report 5725, 20p.
Williams, M.G. (1974a) Diamond drilling report on the Lad and Lass claim groups, Mt. McCusker area, Mineral Assessment report 5328.
Williams, M.G. (1974b) Geological, prospecting and diamond drilling report on the Bertha claim groups, Sikanni Chief River, Robb Lake area, B.C. Ministry of Energy and Mines, Mineral Assessment report 5469, 52p.
440000E
460000E
445000E
455000E
6320000N
6345000N 6345000N
DUNEDIN FORMATIONGrey crystalline dolostone, dark grey argillaceous stromaporoid and amphiporoid-rich limestone (patch reefs?), argillaceous crinoidal limestone, minor dark calcareous shale. (Ddu): Sections at Mt. Bertha probably include younger shelf limestones.
94/BC A
N
F
O P
94/G H
4 3 12
5 6 8
12
7
1011 9
13 14 15 16
Peace Reach
Williston Lake
Finlay River
Takla Lake
97
122°124°126°
57°
56°
LOCATION MAP
MAP AREA
BRITISHCOLUMBIA
Dbr
Dw
Dd, Ddu
Ds
Dm
Sq
Dd-DBr
68
32
32
28
6066
707453
4026
30
15
5
32
22
40
5020
60 25
25 45
40
65
80
45
4
20
60
25
50
80
45
30
18
7845
12
1210
10
45 2536
40
5015
30 32
1840
25
30
3050
30
20
3320
40
30
50
5
75
75
1530
4840
20
40
60
48
49
37
13
26
18
2020
15
30
12
35
16
4225
5520
50 30 25
85
70
20
80
80
35
10
5
25
8
4649
26
30
15
10
10
30
3630
22
29
16
26
20
3529
40
10
801018
5
20
2519
26
15
25
4433
17
30
40
15
34
60
12
1035
15
6025
20
1025
34
24
68 70
STONE AND DUNEDIN FORMATIONS UNDIVIDEDDiscontinuous dark grey fossiliferous and calcareous dolostone overlying lighter grey, more massive unfossiliferous dolostone.Dsd
LATE ORDOVICIAN TO EARLY SILURIAN ROAD RIVER GROUPBrown shale, graded quartz ss., dark calcareous shale, laminated dolomitic siltstone. Equivalent to Sb + Ob (undivided).
SILURIAN BRECCIA UNITMatrix supported beds consisting of fragments of tabular dolostone, nodular chert, fossil debris. The beds are in sharp contact (above and below) with sequences of thinly interbedded cherty dolostones and brown dolomitic siltstones.
Sbx
71
q u a r t zi t e
ma
r ke
r
?
DUNEDIN AND BESA RIVER FORMATION (WESTERN FACIES)Black argillite and shale grading to and infolded with dark shaly limestone, lenses of crinoidal limestone.
094B 005 456710 6309600 ROBB LAKE, WEBB, WEST WEBB Developed Prospect ZN PB094B 012 457130 6314800 RON Showing ZN PB FE094G 004 456003 6340785 RB, DEV, JUNE, MOUNT BERTHA, MT. BERTHA Showing PB ZN BA094G 005 448999 6328063 NEIL, JR Showing ZN PB CU094G 007 447608 6345708 TRI, COLLEDGE CREEK Showing PB ZN CU BA094G 008 455705 6344191 LYNDA Showing PB BA094G 009 448900 6348225 Showing
449598 BOOT, HEEL6345312 Showing094G 014 444551
ZN PBLAD, LASS ZN PBProspect
094G 015 ZN PB6331650
RON
NORDLING CREEK CU PB ZN BA094G 013
6327718454432 TOLL, BERTHA Showing
TOLL
NORDLING CREEK
McCusker thrustGautschi thrust
McCusker thrust
24002200200018001600
I J
McCu s k e r - S i d e n i u s t h r u s t
240022002000180016001400
220020001800160014001200
24002200200018001600
2400220020001800160014001200
G H
E F
2400
1400
TRI
RB
LYNDA
MINFILE
SYMBOLS
EARLY AND MIDDLE DEVONIAN
LEGEND
REFERENCES
OSrr
Ministry of Energy and MinesMinerals DivisionGeological Survey Branch
(Abandoned)
F
CC
CC
Ok
Ok
Ok
Ok
Sn
Sn
SnSn
Sn
SnDm
Dm
DmDm
DmOb
Ob
Ob
Osk
Osk
Osk
Osk Dm
Dm Dbr
DbrDm
Sb
Sb ObDm Dbr Ds
Dm
Dd
DbrSn
Sq
Sq
Ok
Sb
Dbr
DsSq
Sq
Sb SbObOb
DbrDs
DdDs
Sn
Sb
DmDs
Sq
Ok
McCuskerthrust
Gautschithrust
Gautschithrust
Bartlethrust
Bartlethrust
ESL (metres)
OSrr
ESL
ESL
ESL
ESL
DOLOMITIC QUARTZ SANDSTONE UNITMassive beds of dolomite cemented medium and fine grained quartz sandstone. Probable stratigraphic equivalent to unit Ds.
Dqs
McCusker-Gautschithrust
Dd
Dm,Dw
Dm,Dw
Dm,Dw
Dm,Dw