Database name: |
Canadian Iron Formation |
Custodial agency: |
Geological Survey of Canada |
Compilers: |
G. A. Gross and E. M. Hillary |
Release date: |
2014-10-01 |
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Deposit name(s): |
Borealis - 5 Northern Zone (occurrence); West Melville Iron Deposits (occurrence) |
Political location(s): |
Canada; Province or state: Nunavut; Subprovince or locality: Melville Peninsula |
NTS map data: |
047B07 (Mackar Inlet) |
Deposit clan (type): |
lode gold |
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 |
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 (host rocks) Archean (mineralization) |
Host rocks: |
(1) sedimentary; iron formation; Depositional setting: shallow marine; Component: mineralization zoneExternal host rock forms: | tabular sedimentary body | Internal host rock structures: | massive | Individual lithologies: | iron formation - oxide | Host rock stratigraphy: | Prince Albert group |
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Metallogenic signatures: |
Fe |
Mineralogy: |
(mineralization - massive / mineralization zone): magnetite, hematite, quartz |
Deposit shape: |
tabular; Component: mineralization zoneDeposit dimensions: | width: 183 metres length: 305 metres |
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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: property geology) 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 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. Unlike the Southern part of the Borealis - 5 deposit, Northern and Central parts of the deposit are not intruded by granite. The Northern Zone has an average width of 600 feet and a length of 1000 feet.
(Applies to: reserve/resource descriptions) The total tonnage per vertical foot for the northern and central parts of the deposit is 690,000 long tons. The reserve estimates - Ref ID- 2688 - were 85 million long tons.
(Applies to: rock analysis and sample assays) Channel samples across the deposit assayed average Fe (soluble fraction) 29.1 % and Fe (magnetic fraction) 26.3 %. |
Links to other databases: |
NUMIN; Key value: 047BSE0026 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) |
Samples data: |
(1) Sample type: channel; Sample description: Soluble and magnetic Fe fractions of samples; Collector: ScruggsCommodities and grades in order of importance: | Fe (magnetic): 26.3 percent Fe (soluble): 29.1 percent | Reference number: 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 |
References: |
Anonymous, 1982 |
Preliminary Feasibility Study, Borealis Roche Bay Magnetite Project (062133) |
Mineral Assessment Report, Borealis Exploration Ltd; Scott-Ortech Mining Ltd (operator), Indian and Northern Affairs Canada, Publication code 062133 |
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 |
Underhill, D. H., 1969 |
Report for Borealis Exploration Limited on Mineral Exploration on Permits 47B2 and 47A5 and 6, Melville Peninsula A (019503) |
Mineral Assessment Report, Borealis Exploration Ltd, Indian and Northern Affairs Canada, Publication code 019503 |
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 |
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Resource data: |
Disclaimer - Reserves/Resource Data
Her Majesty the Queen in Right of Canada, represented by the Minister of Natural Resources (NRCan) does not warrant or guarantee the accuracy, completeness or fitness for any purpose of Reserve and Resource information (Data) contained in this database, including whether the Data is compliant with any securities regulations or standards, and NRCan does not assume any liability with respect to any damage or loss incurred as a result of the use made of the Data.
Resource and reserve figures are historical in nature. The Data source provided with each set of figures should be cited if the Data are re-reported. |
Estimate date: 1977; Component: mineralization zone; 85 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% |
Associated group(s): |
West Melville Iron Deposits (31) |