CANADIAN AND WORLD MINERAL DEPOSIT DATABASES
Geological Survey of Canada


Deposit number Country Location Names Commodities
529 Canada (Northwest Territories) / Ca 65.42.48 N -- 116.29.53 W Jackpot; Jackpot Claim Group; JEN Claim Group (JEN1-15); U Claim Group (U1-20) U; Cu; Fe; REE
 
Database name: World Fe-oxide+/-Cu-Au-U (IOCG) deposits
Compilers: Sunil S. Gandhi
Release date: 2015-03-04
   
Deposit name(s): Jackpot; Jackpot Claim Group; JEN Claim Group (JEN1-15); U Claim Group (U1-20)
Political location(s): Canada; Province or state: Northwest Territories; Nearest community: Yellowknife (380 km NNW)
Canada; Province or state: Northwest Territories; Nearest community: Port Radium / Great Bear Lake (65 km E)
NTS map data: 086F09 (Bishop Lake)
Deposit clan (type): Cloncurry-type
Deposit (sub) types: subparallel lensoid zones ; Uraninite and chalcopyrite in magnetite-rich lenses and pods, up to15 m long, in biotitic granitoid paragneiss; U-Th ratio up to 1; Ag and rare earths present; some magnetite-apatite-actinolite veins; Reference: McGlynn, J. C., 1971: Metallic Mineral Industry, District of Mackenzie; Paper, Geological Survey of Canada, Publication code 70-17, 194 p.
Deposit status: prospect; Size category: very small
Geologic province: Wopmay Orogen
Geologic subprovince: Great Bear Magmatic Zone
Geologic district: Northern Wopmay Fault Zone
Deposit object located: shaft
Commodities: U; Cu; Fe; REE
Mineralization styles: stratiform magnetite-rich lenses in paragneiss; paragenetically younger sulphides and uraninite
Geological ages: Middle Paleoproterozoic (host rocks)
Middle Paleoproterozoic (mineralization)
Tectonic setting: continental marginal deformation zone-major fault zone; convergent; Formal name: Wopmay Faut (or Medial) Zone (host rocks)
continental marginal deformation zone-major fault zone; convergent; Formal name: Hottah Terrane-Slave Craton Collision Zone (country rocks)
Coincident features: lenses and pods in layered gneisses (metasedimentary remnant of the Paleoproterozoic Hottah terrane near the west boundary of the Wopmay fault zone); Coincident feature name: Treasure Lake Group
lenses and pods in layered gneisses (15 m wide zone trends northerly; variable steep dips; local minor folds and crenulations in the magnetite-biotite-rich paragneiss); Coincident feature name: Treasure Lake Group
Regional tectonic structure: general north trend parallel to Wopmay Fault Zone (a remnant of metasedimentary strata in the Paleoproterozoic Hotah terrane that collided with the Slave craton to the east ca. 1883 Ma) Tectonic structure name: Treasure Lake Group
Host rocks: (1) metamorphic; paragneiss (biotite-rich granitoid paragneisses); Depositional setting: continental; Metamorphic grade: amphibolite
External host rock forms:gneissic
Host rock protoliths:iron-rich siltstone (possibly magnetite-rich placer or iron-rich tuffaceous siltstones); Host rock protolith name: Treasure Lake Group
Internal host rock structures:foliated to layered; crenulated
Individual lithologies:biotitic quartzo-feldspathic gneiss (varies from massive granitic to layered gneisses; bedding and lamination seen in thin sections; locally garnet and cordierite)
Host rock stratigraphy:Treasure Lake Group
Related igneous rocks: (1) intrusive; granite suite (gradational boundary with paragneiss); Initials: Porphyritic granite; Magma series: calc-alkaline; Depositional setting: continental
Individual lithologies:potassic granite (perthitic microcline phenocrysts in matrix of quartz, plagioclase, biotite and opaque minerals)
Country rocks: (1) paragneiss; (grades into granitic gneiss); Country rock name: Treasure Lake Group; Metamorphic grade: amphibolite
Country rock protoliths:iron-rich siltstones (possibly magnetite-rich placer or iron-rich tuffaceous siltstones); Country rock protolith name: Treasure Lake Group
Individual lithologies:biotitic quartzo-feldspathic gneiss (zone of granitized metasedimentary rocks 3 x 1.5 km; grades into granitic gneiss; trend NNE)

(2) felsic volcanic assemblage; (unconformably overlying paragneisses); Country rock name: Sloan Group ; Metamorphic grade: none
Country rock protoliths:felsic volcanics (extrusives of the Great Bear magmatic zone ca. 1875-1865 Ma old); Country rock protolith name: Sloan Group
Individual lithologies:dacite-rhyolite (volcanic textures preserved)

(3) granite; (grades into paragneiss); Country rock name: porphyritic granite; Metamorphic grade: none
Country rock protoliths:granite (no sharp boundaries with the paragneiss ); Country rock protolith name: porphyritic granite
Individual lithologies:granite (perthitic microcline phenocrysts 35%, 20 % plagioclase, close to 40% quartz, 5% green biotite, accessory opaque minerals)

(4) diabase; (intrusive sheet dipping gently to south); Country rock name: Hottah diabase sheet; Metamorphic grade: none
Country rock protoliths:diabase (ENE-trending sheets dated at 780 Ma; one covers the area north of mineralized paragneiss of the Jackpot showing); Country rock protolith name: Hottah diabase sheet
Metallogenic signatures: Fe-U-Th-Cu-Ag-REE
Alteration signatures: tourmalinization: tourmaline, schorl; What was altered: host mafic paragneiss
hematization: hematite after primary magnetite; What was altered: magnetite
Mineralogy: (alteration): hematite
(gangue): quartz
(mineralization): magnetite, uraninite, zircon, allanite, xenotime, apatite, pyrite, chalcopyrite, tourmaline, fluorite, ilmenite, pseudobrookite, galena
Radiometric ages: Object dated: Mineralogy(2); Age - Ma: 1,872; +8; -8; Dating method: U-Pb; Concentrate: uraninite; Source rock: magnetite-rich paragneiss; Formal name: redistribution of syngenetic uranium; Event dated: mineralization; Interpretive comment: mineralization interpreted by Miller (1982) as slightly older than the Great Bear magmatic activity; Reference: Miller, R. G., 1982: The Geochronology of Uranium Deposits in the Great Bear Batholith, Northwest Territories; Canadian Journal of Earth Sciences, Volume 19, p. 1428 - 1448

Object dated: Mineralogy(2); Age - Ma: 1,849; +10; -10; Dating method: U-Pb; Concentrate: uraninite; Source rock: magnetite-rich paragneiss; Event dated: mineralization; Interpretive comment: this age may reflect resetting of isotopic equilibrium in the mineralization dated at 1872 ± 8 Ma; Reference: Miller, R. G., 1982: The Geochronology of Uranium Deposits in the Great Bear Batholith, Northwest Territories; Canadian Journal of Earth Sciences, Volume 19, p. 1428 - 1448
Deposit shape: lensoid
Deposit dimensions:strike length: 15 metres
width: 2 metres
length down-dip: 10 metres
Qualified comments: (Applies to: discovery and development) First staked in 1953; 3 mineralized zones about 1 km apart; drilling on the main zone to the north in 1954-'55 totalled 810 m in 16 holes; best assay: 0.17% U over 0.6 m; a 10 m inclined shaft in 1957; surface exploration intermittentlly after 1950s; airborne magnetic anomaly is 1000 nT; ground magnetic relief is 6000 nT; main anomaly about 1 km long; trends SSE; coincident spectrometric anomalies; second zone 1 km to the SSW; a trench sampled in 1972 ran 1.4% Cu and 6 g/t Ag over 6 m; a third radioactive zone is located 1 km east of the second zone and is relatively little explored
References:
Gandhi, S. S., 1992
Magnetite Deposits in Metasiltstones of the Snare Group at Hump Lake, Northwest Territories
in Current Research 1992, Part A, Edited by Geological Survey of Canada, Paper, Geological Survey of Canada, 92-1A, p. 225 - 235

Gandhi, S. S., 1994
Geological Setting and Genetic Aspects of Mineral Occurrences in the Southern Great Bear Magmatic Zone, Northwest Territories
in Studies of Rare-Metal Deposits in the Northwest Territories, Edited by Sinclair, W. D.; Richardson, D. G., Bulletin, Geological Survey of Canada, 475, 96 p, p. 63 - 96

McGlynn, J. C., 1971
Metallic Mineral Industry, District of Mackenzie
Paper, Geological Survey of Canada, Publication code 70-17, 194 p.

Miller, R. G., 1982
The Metallogeny of Uranium in the Great Bear Batholith Complex, Northwest Territories
Ph. D. Thesis, University of Alberta, Edmonton, Alberta, University of Alberta, Edmonton, Alberta, 271 p.

Miller, R. G., 1982
The Geochronology of Uranium Deposits in the Great Bear Batholith, Northwest Territories
Canadian Journal of Earth Sciences, Volume 19, p. 1428 - 1448


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