Database name: | Canadian Iron Formation | |||||||||
Custodial agency: | Geological Survey of Canada | |||||||||
Compilers: | G. A. Gross and E. M. Hillary | |||||||||
Release date: | 2014-08-21 | |||||||||
Deposit name(s): | Borealis - 3 East Limb (occurrence); West Melville Iron Deposits (occurrence) | |||||||||
Longitude / Latitude: | -85.48650 / 68.19400 | |||||||||
Political location(s): | Canada; Province or state: Nunavut; Subprovince or locality: Melville Peninsula | |||||||||
NTS map data: | 047B02 (Folster Lake) | |||||||||
Deposit clan (type): | iron formation | |||||||||
Deposit (sub) types: | Algoma type; Reference: Underhill, D. H., 1970: Report on the 1970 Mineral Exploration Program, Melville Peninsula (060744); Mineral Assessment Report, Borealis Exploration Ltd; UnderhillDH (Norman H. Ursel Associates Ltd) (operator), Indian and Northern Affairs Canada, Publication code 060744 | |||||||||
Deposit status: | advanced project; Size category: significant; Status comments: Indicated resources based on surface areas determined by planimeter - 77 million long tons for West Limb and 54 million long tons for East Lmb; hematitic ore - 131million long tons (Ref ID 2688) | |||||||||
Geologic province: | Canadian Shield | |||||||||
Geologic subprovince: | Rae craton | |||||||||
Deposit object located: | centre of mineralized zone | |||||||||
Commodities: | Fe | |||||||||
Mineralization styles: | stratiform (mineralization zone) | |||||||||
Geological ages: | Archean (mineralization) Archean (host rocks) | |||||||||
Host rocks: | (1) sedimentary; iron formation; Depositional setting: shallow marine
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Metallogenic signatures: | Fe | |||||||||
Mineralogy: | (mineralization - massive / mineralization zone): magnetite, hematite, quartz, specularite | |||||||||
Deposit shape: | tabular; Component: mineralization zone
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Qualified comments: | (Applies to: location ) The location of the deposit was taken from AR 060744 Figure 11 (Geologic map of the vicinity of Borealis 1,2 and 3 iron formation occurrences). (Applies to: mineralization) Western Melville Peninsula hosts metamorphosed Algoma-type iron formation deposits within the Archean Prince Albert Group greenstone belt. The orebodies occur within a zone that extends for approx 15 miles in length. Five deposits, Numbers 1 to 5, (plus subdivisions) have been outlined. Hematite is the principal iron oxide in Deposit 3 West Limb , while both magnetite and hematite occur in 3 East Limb. The East Limb of Deposit 3 consists of a near vertically dipping slab of iron formation that averages at least 250 feet in width over a length of 4,500 feet. The East Limb is partially covered on the surface by 230 m wide younger quartzite. (Applies to: reserve/resource descriptions) Borealis 3 has 2 zones: 1) West Limb (Q) and 2) East Limb. There is no grade data and no samples taken from the East Limb. The ore is hematitic and estimated to be 131 million long tons, which is subtracted from the total tonnage of Borealis 1, 2, 3, 4 and 5. (Applies to: property geology) The east flank of the Borealis 3 deposit has the form of a vertically dipping slab, partially masked by glacial drift and thin (probably 20 ft) cover of Proterozoic quartzite, calc-silicate and marble lying unconformably on the iron formation. The I.F. (almost vertical dips) is intermittently exposed because of the moderate 10-60 dip of the Proterozoic sediments. | |||||||||
Links to other databases: | NUMIN; Key value: 047BSE0025 NMI; Key value: 47 B 2 Fe 1 | |||||||||
Geophysical-chemical signature: | Signature type: Airborne Magnetometer; Response type: positive (strong) | |||||||||
References: |
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Resource data: |
Estimate date: 1977; Component: mineralization zone; 54 million long tons ore; Combined with production?: no; Provisional entry?: yes; Resource category: geological resource Reference: Scruggs, G. G., 1977: Geology and Research of all Borealis Claims, Melville Peninsula (080645); Mineral Assessment Report, Borealis Exploration Ltd, Indian and Northern Affairs Canada, Publication code 080645 Percent weights allocated to deposit: 100.0% |