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 - 5 Southern Zone (occurrence); West Melville Iron Deposits (occurrence) | ||||||||||||
Longitude / Latitude: | -85.30456 / 68.36473 | ||||||||||||
Political location(s): | Canada; Province or state: Nunavut; Subprovince or locality: Melville Peninsula | ||||||||||||
NTS map data: | 047B07 (Mackar Inlet) | ||||||||||||
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 of Southern zone based on surface areas determined by planimeter - 331 million 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); massive (mineralization zone) | ||||||||||||
Geological ages: | Archean (host rocks) Archean (mineralization) | ||||||||||||
Coincident features: | fault(s) | ||||||||||||
Host rocks: | (1) sedimentary; iron formation; Depositional setting: shallow marine; Metamorphic grade: amphibolite - lower; Component: mineralization zone
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Related igneous rocks: | (1) intrusive; granite suite
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Metallogenic signatures: | Fe | ||||||||||||
Mineralogy: | (mineralization - massive / mineralization zone): magnetite, hematite, quartz | ||||||||||||
Deposit shape: | tabular; Component: mineralization zone
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Qualified comments: | (Applies to: location ) The location was taken from AR 060744 Figure 14: Geologic Map of the Borealis 5 Iron Formation Occurrence. (Applies to: reserve/resource descriptions) Indicated reserves based on surface areas determined by planimeter - 3 zones (North, Central and South), total potential tonnage 1,406 million long tons (Ref ID 2688). No sampling done. Indicated reserves of Southern zone based on surface areas determined by planimeter - 331 million long tons, 276,000 tons per vertical foot. (Applies to: property geology) The Borealis - 5 deposit is divided into 3 sections by two strike-slip faults which offset the I.F. The deposit consists of an isoclinal fold plunging steeply to the north. It is irregular in outline as the result of a complex history of steeply folding, refolding, and faulting. Magnetite and quartz are the most common mineral phases, hematite also occurs. The Southern part has been intruded by granite its depth projections are uncertain. (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. Magnetite, with minor specularite and quartz, are the main minerals in the iron formation of Deposits 1, 2, 4, and 5. The deposits contain an estimated combined tonnage of 3.3 billion long tons, based on surface sampling (not drilling). The Borealis 5 deposit has been subdivided into North, Central and South and consists of an isoclinal fold plunging steeply to the north. The deposit as a whole outcrops over 10,000 feet, and is up to 1,800 feet thick.The Southern Zone has an average width of 600 feet and a length of 4200 feet. | ||||||||||||
Links to other databases: | NUMIN; Key value: 047BSE0027 NMI; Key value: 47 B 02 Fe 1 | ||||||||||||
Geophysical-chemical signature: | Signature type: Airborne Magnetometer; Response type: positive (strong) Signature type: Ground Magnetometer; Response type: positive (strong) | ||||||||||||
References: |
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Resource data: |
Estimate date: 1977; Component: mineralization zone; 331 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% |