Upload
others
View
5
Download
0
Embed Size (px)
Citation preview
Abdel Aty B. Salman Former Chairman, Nuclear Materials Authority (NMA), Cairo, Egypt
http://kenanaonline.com/absalman
Geology of the Nile Basin Countries Conference,
Alexandria, Egypt, 20-23 March, 2012
URANIUM POTENTIALITIES IN THE NILE BASIN COUNTRIES *
Abdel-Aty Badr Salman Former Chairman, Nuclear Materials Authority, Cairo, Egypt
Website:http:kenanaonline.com
Abstract River Nile Basin Countries (RNBC) are sharing together water from the great Nile River and
its tributaries and upper Nile lakes. They have, in general, similar major geologic and structural
features within the African carton. These countries include: Egypt, Sudan, Southern Sudan,
Ethiopia, Eritrea,Congo, Uganda, Kenya, Rwanda, Burundi and Tanzania.
Based on the nature of the geologic provinces in RNBC, it is evident that most of these
countries have good potentialities for hosting uranium resources. Moreover, some of these countries
include economic uranium deposits, uranium occurrences and or radioactive anomalies.
The Archean rocks which form the back bone of African craton have a good potentiality for
hosting unconformity related uranium - type deposit. The Pan-African Granites and the associated
acidic volcanics are favor rocks for including vein type uranium resources. Intra-cratonic basins,
which represent prominent structural features in the East Africa Region, can be considered as
important entrapment structures for uranium deposits. The volcanic activities through the East
Africa Region in the various episodes have a remarkable role in redistribution of uranium in many
geologic formations. The Phanerozoic sedimentary successions have certain horizons with good
uranium bearing strata.
______________________
*Presented in Geology of the Nile Basin Conference (GNBCC-2012) as invited talk., Alexandria,
Egypt, 20-23 March,2012)
1. Introduction )NB Countries & Importance of Uranium Resources )
2. Stages for uranium exploration
3. Types of Uranium Deposits
4. Uranium Potentialities in NB Countries
5. Conclusion and Recommendations
NB Countries
* NB countries are 11: Egypt, Sudan, Southern Sudan, Ethiopia, Eritrea, Congo, Uganda, Kenya, Rwanda, Burundi and Tanzania.
* NBC are sharing and show similarities in the main geologic provinces and major structural features.
* The information about U resources in the NBC are scarce, this may cause some deficiency in this presentation.
Egypt
Sudan
Ethiopia
Uganda Congo Kenya
Tanzania
Rwanda
Burundi
Eritrea
1.
NILE
BASIN
COUNTRIES
East Africa Rift &
Nubian - Arabian
Shield
NBC share in the
main geologic &
structural features
•Red Sea Hells
• Intracratonic
Basins
• East Africa Rift
CONGO
CRATON
EAST
SAHARA
CRATON
WEST
AFRICA
CRATON HU
GG
AR
BE
LT
Uranium is essential for nuclear fuel cycle: Nuclear
energy production (Low coast), isotopes production,
other uses, entrance of modern technology fields
STOP
STOP
STOP
EVALUATE
REGIONAL
GEOLOGY
EXPLORE
REGION
EVALUATE
URANIUM
OCCURRENCES
PREPARE FOR
DEVELOPMENT
FAVORABLE
IAEA 1980 BULLETIN VOL. 22, NO 1
NO
YES
YES
YES
NO
NO
URANIUM
FOUND
?
RECOVER
ABLE
?
2. SEQUENCE OF EVENTS IN URANIUM
RESOURCE DEVELOPMENT
(Stages for Uranium Exploration)
Deep
Trenches
Exploratory
Wells
1.REGIONAL PHASE
A. COLLECTING INFORMATION
A.3.
TOPOGR. MAPS &
SPACE IMAGES
A.2.
GEOPHYSICAL
MAPS
A.1.
GEOLOGIC &
METALOGINIC
MAPS
REGIONAL SURVEYING B.
B.3. GEOCHEMICAL
SURVEY
B.2 2.2. AIR BORNE RADIOMETRY
B.1. REGIONAL
GEOLOGICAL
Fig. Airborne radiometric survey maps showing total count gamma radiation, uranium and thorium contents in ppm.
2.3
geologic &
RADIOMETRIC
2-2
FOOT
2.1
CARBORNE
RADIOMETRIC
3. DETAILED SURVEY 3.3
Drilling &
exploratory mining
3-2.
Trenching &
Sampling
3.1
Mapping: Top.,Geol
&radiometric
3.4
Ore Reserve
3.5
Ore Configuration
3.4
Ore Grade
4.MINING AND MILLING
Notes Type *Proterozoic: Athabasca Basin, Saskatchewan, Canada *The Phanerozoic deposits: Le Rouble, France * Red Sea Hells, Egypt
1.
Unconformity-
related
Extensional basins and intracratonic Carbon: Shirley Basin, Wyoming, USA Sulphides: Benavides Deposit, Texas, USA Tabular: Grants Uranium Region, New Mexico, USA
2.
Sandstone
Upper Archean to Lower Proterozoic age: a. U-dominant with REE): (Blind River — Elliot Lake, Ontario, Canada) b. Polymetallic (Au + U) : Witwatersrand, South Africa
3.
Quartz-
pebble
conglomerate
Spatially related to granite: 1.Intragranitic veins: Fanay, Haute
Vienne, France, 2. Perigranitic veins: Pribram, Czech
Republic, 3. In metamorphic or sedimentary rocks:
Shinkolobwe, Shaba, Zaire
4.
Veins
Intracratonic & Extensional basins (matrix of hematite-rich
breccias) : Olympic Dam, Australia
5.
Breccia
complex
Alaskite: Rössing, Namibia Granite, monazite: Bingham Canyon, Utah, USA. Red Sea Hells, Egypt Peralkaline syenite: Kvanefjeld, Greenland Carbonatite: Phalaborwa, South Africa Pegmatite: Bancroft area, Ontario, Canada
6.
Intrusive
Phanerozoic sediments(Marine)
Utah–Idaho, USA , North Africa and Middle East Phosphate belt
7.
Phosphorite
Extensional basins: Deposits are in circular, vertical (up to 1000 metres in vertical extent) pipes Uranium occurs as pitchblende with sulphides and carbon in permeable breccia matrix (Orphan mine, Arizona, USA )
8.
Collapse
breccia pipe
*stratabound, structure-bound, combinations of both. Rexspar, British Columbia, Canada Ben Lomond, Queensland, Australia
9. Volcanic
(a) stratabound in dominantly unconsolidated surfacial sediments
(b) structure-bound uraniferous within source rocks.
Lake Raeside, Australia
(c) lose detrital recent sediments (Basin) Jordan
10.
Surfacial
*Uranium occurs in alkali silicate metasomatites (albitites,
aegirinites and alkaliamphibole rocks), commonly intruded by
microcline granite.
Zheltye Vody, Krivoy Rog, Ukraine
11.
Metasomatite
Stratabound, disseminated uranium occurs in metasediments
and/or metavolcanics, generally without direct evidence of post
metamorphic mineralization.
12.
Metamorphic
*Irregular concentrations of uranium occur in lignite and in clay
and/or sandstone immediately adjacent to lignite.
North Dakota and South Dakota, USA
13.
Lignite
Uranium (generally 10–400 ppm) and associated metals, such as
Mo, V and Cu, occur in carbonaceous marine shales.
Kolm/Alum Shale, Sweden
14.
Black shale
Fig. : Types of uranium deposits and their related geologic provinces
Massive U - oxide
Alteration zone
More than 500 000 tU in Athabasca area, Cuney, 2007)
The mechanism of Roll front uranium
deposit formation http://www.icmj2.com/03Oct/03OctFeature.htm
Mudstone
Mudstone
Flow of ore bearing solutions
Red altered S.S
Yellow altered S.S
Bleached altered S.S
Ore
Mineralized S.S. decreasing
in grade with arrow
S.S
. T
hic
kn
es
s
5
to
30
f
0 to 200 ft 100 to 500 ft
Geologic Provinces and Uranium Potentialities
Country
* Pre-Pan-African gneissose granitic rocks (Uranium & tantalum-niobium mineralization; disseminated and vein type).
1. Egypt
* Pan African granites (vein type)
* Unconformity uranium contact zone between Precambrian basement and Phanerozoic sedimentary rock
* Volcanic rocks of various ages; vein type uranium
* Carboniferous clastic sediments; banded uranium
Geologic Provinces and Uranium Potentialities Country
*Archaean-Lower Proterozoic Basement (Gold, Tin,
Diamonds, Radioactive elements, Asbestos, Mica,
Graphite & Marble, Int.1); Unconformity and vein type U
2-Sudan & 3-Southern Sudan
* Granite rocks (Miri locality, Kadugli area in the southern part of Kordofan Province in the Nuba Mountains); vein type of U & Th, (Sadig, et al., 1988).
*Tectonic zones breccias, vein type; uranium associated with phosphate ( U= 2220 ppm, P2 O5 = 26,1% with high V content)
* Palaeozoic cover; (Marble, Precious Stones, Heavy
;Uranium Sandstone - type(Metals, Radioactive Material
Geologic Provinces and Uranium Potentialities
Country
*Archean, Early Proterozoic and Contacts between
Precambrian and Phanerozoic sequences ; Unconformity
related type U
4. Ethiopia
Late Proterozoic granites and pegmatite's; vein type U,
lenticular bodies of U- Th rich accessory minerals.
* Volcanic rocks of various ages; vein type uranium
Intra cratonic basins and Carboniferous sequence : Uranium Sandstone – type
Geologic Provinces and Uranium Potentialities
Country
* Neo-Proterozoic unites : Vein and disseminated
uranium with rare earth elements
5. Eritrea
* post-tectonic granitoids and associated volcanic rocks: Vein and disseminated uranium type
• Mesozoic Sediments & intra-cratonic basins (Sandstone intercalated with siltstones): Sandstone uranium type
* Closed basins: Surfacial uranium deposits
Geologic Provinces and Uranium Potentialities
Country
*Late Proterozoic mica schists underlying a quartzite
horizon: Disseminations or as veins of pitchblende, and
secondary uranium minerals
6. Congo
* Shinkolobwe uranium deposits were discovered in 1915. This mine, near the southern Congolese town of Likasi, produced uranium for the first atomic bombs.
* Precambrian massifs bordering, to the south, east and north. 400 km. long belt of uranified minerals, stretching from south of Lubumbashi to Kalongwe,west of Kolwezi east, a vast sedimentary central basin.
Shinkolobwe U mine location, Congo
Gold, Uraninite (Shinkolobwe Mine: Kasola Mine, DRCongo, http://www.mindat.org/photo-241509.html
Becquerelite with fourmarieite on uraninite, Shinkolobwe Mine, Congo
Wulfenite PbMoO4 With kasolite , Shinkolobwe, Shaba, Congo
Pegmatites and granites in eastern and western regions, Buganda and Karamoja.
1
Sandstone in the Rift Valley and Buhweju plateau 2
Unconformities in the metasediments of Buganda- Toro System, Karagwe-Ankolean System, Kyoga Series and Singo-Mityana Series
3
Springs along Rift Valley margins and
4
Volcanic tuffs in Fort Portal area 5
Geologic Provinces and Uranium Potentialities
Country
* Precambrian crystalline Basement Unconformities in the
metasediments of Buganda-Toro System, Karagwe-Ankolean
System, Kyoga Series and Singo-Mityana Series;
Unconformity U- type mineralization and other types
7. Uganda
* Pegmatites and granites in eastern and western regions,
Buganda and Karamoja; vein type U deposits and polymetallic
minerals.
* Volcanic tuffs in Fort Portal area; volcanogenic u deposits
* Sandstone in the Rift Valley and Buhweju plateau; Sandstone
U - type
Geologic Provinces and Uranium Potentialities
Country
* Proterozoic gneisses of the Mozambique belt form the
basement of an intracratonic basin, filled with continental
Permo-Triassic elastics: Vein & Sandstone U type deposits
8. Kenya 9. Rwanda
* Carbonatites: rich in rare earth elements, phosphorus, niobium, uranium, thorium, copper, iron, titanium, barium, fluorine, zirconium: Vein or disseminated U type deposits
* Folded and metamorphosed sediments, mainly schists and quartzites intruded by granites, covers most of Rwanda; Unconformity, Vein and disseminated U- types mineralization
*Cenozoic to Recent volcanic rocks occur in the northwest and west. Some of these volcanics are highly alkaline ; Vein type U
* Tertiary and Quaternary sediments fill parts of the Rift in the western Rwanda; Sandstone and surfacial U types
Namibia Lofdal Carbonatite Complex
Geologic Provinces and Uranium Potentialities
Country
* Folded and slightly metamorphosed clastic sediments of
the Mesoproterozoic Kibaran belt underlie most of
Burundi. The Kibaran rocks are intruded by granites:
Conglomerate, vein type and dissiminated U
10. Burundi
* Igneous and residual phosphate accumulations and weathered carbonatite: Vein and dessiminated U type.
* Tertiary and Quaternary sediments fill parts of the Western Rif : Sandstone and surfacial U deposits
Distribution of carbonatites in Tanzania
(after van Straaten 1989)
Distribution of carbonatites in Tanzania (after van Straaten 1989) http://www.uoguelph.ca/~geology/rocks_for_crops/52tanzania.PDF
Tanzania Uranium Overview (Uraniferous mineralization in the Karoo sandstone (roll-front uranium mineralization)
(http://www.uraniumresources.co.uk/overview/index.htm
Karoo Basins
Tanzania
Mtonya Project
Ruvuma Project
Ruhuhu Project
Kayelekera (Paladin)
15,650 t U3O8 Indian Ocean
Dar es Salam
Zambja
DR
Congo
Geologic Provinces and Uranium Potentialities
Country
* Archean granite and greenstone rocks form the central Tanzania Craton: Conglomerate, vein & dissiminated type
11. Tanzania
*Geological and structural model of Mtonya and demonstrated that conditions favourable for roll-front uranium mineralization
*Interior drainage system and closed basins in Central Tanzania: * Surficial type uranium deposits Low-grade, spotty uranium, occurring partly as discrete minerals (uranyl vanadates and silicates). Types: 1. calcrete in Upper Tertiary to Recent 2. thin, mineralized, strongly silicified sheet calcrete
developed directly over weathered granitic basement rocks.
3. mineralized and silicified calcareous Upper Tertiary valley-fill sediments
* The most promising structural features suitable for hosting U are: Intra-cratonic basins, shears and fault zones within acidic igneous & volcanic rocks, unconformities contact zones between igneous and sedimentary rocks and closed basins nearby phosphate bearing formations
Opening cooperation channels in the field of uranium geology and exploration between NBC
1
The cooperation channels can include training in the fields: 2.a uranium exploration stages 2.b. Radiation safety & protection 2.c. Ore processing and technology
2
Encouragement of investment projects in uranium resources for the private sectors in NBC and forming integrated firms. Demands for uranium will increase in the near future.
3
Study of the possibilities for construction of metallogenic map for the Nile Basin Countries. This map, if constructed, will help the investors to upgrade their activities in these countries
4
NBC are similar to one body, River Nile and its tributaries represent the veins in this body. Our role as scientists to keep this body healthy by unlimited scientific cooperation, this is the main way for the future generations to have respectful life in the Earth Planet ( The science is power).
5
40
Thank You
CV (INTRODUCTION
Name: Prof Abdel Aty Badr Salman Born December 22, 1940, El Monofia Province, Egypt
Former Chairman of Nuclear Materials Authority, Cairo, Egypt
e-mail:[email protected] - Website: http:/kenanaonline.com/absalman
Adress: Nuclear Materials Authority, P.O.Box: 530, El Maadi, Cairo, Egypt
B.Sc. in Geology and Chemistry, 1962, University of Alexandria, Egypt. M.Sc. and Ph.D. in Geology (1968
&1975), Faculty Science, Ain Shams University, Cairo, Egypt.
Career Organizations
Nuclear Materials Authority, Cairo, Egypt: Head of the Northern Eastern Desert-Developing Department,
1977, Head of Production Sector (1997), Vice Chairman (1997-1999), Chairman of Nuclear Materials
Authority, Cairo, Egypt (1999-2000). Since Dec.2000: Emeritus Professor and Scientific Advisor in Nuclear
Materials Authority of Egypt and Consultant.
Scientific works
50 Published articles, 35 unpublished scientific reports. Supervisor on 16 Ph.D. and 21 M.Sc.Theses.
Author of books: Nuclear Age, 2005 and Water Conflict in the Arab Region,2011 (In Arabic)
Other Related Activities: Counterpart and/or consultant for IAEA projects and Egypt representative in
IAEA/OECD Uranium Group for 3 years.
•Member in the boards of: Center of Nuclear Researches, Atomic Energy Authority, Egypt (1998-2001).
•Member of the National Committee of Geology, Academy of Scientific Research and Technology, Egypt
(since 2000)
3. Capabilities for managements of academic and scientific institutions. Planning for uranium exploration
and evaluation of uranium reserves. Geological consultation in various geologic, natural resources and
environmental fields.
Awards: Certificate as a distinguished person who has a considerable achievement in science, included
in “Who is Who in the World”, vol.6, published 1982-1983.