Database name: |
Canadian Iron Formation |
Custodial agency: |
Geological Survey of Canada |
Compilers: |
G. A. Gross and E. M. Hillary |
Release date: |
2014-08-21 |
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Deposit name(s): |
Mary River - No. 4 (occurrence) |
Longitude / Latitude: |
-79.86378 / 71.46107 |
Political location(s): |
Canada; Province or state: Nunavut; Subprovince or locality: North Baffin Island |
NTS map data: |
037G05 |
Deposit clan (type): |
iron formation |
Deposit (sub) types: |
Algoma type; Reference: Watts Griffis and McOuat Ltd., 1983: A Summary Report on the Mary River Deposit of Baffinland Iron Mines Ltd. (062161); Mineral Assessment Report, Baffinland Iron Mines Ltd., Indian and Northern Affairs Canada, Publication code 062161 |
Deposit status: |
advanced project; Size category: significant; Status comments: Estimated reserves (1966) 46 million tons of 66.84 % up to 350 ft of open pit depth. Of this, 1/3 is high grade magnetite lump and rest is micaceous specular hematite and finely granular magnetite. |
Geologic province: |
Canadian Shield |
Geologic subprovince: |
Rae craton |
Geologic district: |
Committee belt |
Deposit object located: |
centre of mineralized zone |
Commodities: |
Fe |
Mineralization styles: |
stacked lenses |
Geological ages: |
Archean (host rocks) |
Host rocks: |
(1) sedimentary; iron formation; Metamorphic grade: amphibolite - lower; Component: mineralization zoneExternal host rock forms: | tabular sedimentary body | Internal host rock structures: | massive granular | Individual lithologies: | iron formation - oxide | Host rock stratigraphy: | Mary River group |
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Mineralogy: |
(mineralization / mineralization zone): specularite (mineralization - massive / mineralization zone): magnetite |
Deposit shape: |
multiple lenses; Component: mineralization zoneDeposit dimensions: | length: 7,800 ft width: 250 ft |
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Qualified comments: |
(Applies to: mineralization) The deposit has an known strike length of 7800 feet and the width varies from 50 feet to >250 feet. The high grade zone represent 4 elongated lenses of contrasting mineralogy and texture. One third of the reserves is high grade magnetite lump, the remainder is friable mixture of granular to coarse micaceous specular hematite and less finely granular magnetite.
(Applies to: reserve/resource descriptions) Estimated reserves (1966) 46 million tons of 66.84 % up to 350 feet of open pit depth. Of this 1/3 is high grade magnetite lump and rest is micaceous specular hematite and finely granular magnetite. The orebody coincides with a strong magnetic anomaly, which extends farther along the strike that increases the possibility of additional high grade tonnage.
(Applies to: location and access) Deposit 4 is located 15 miles NW of Deposit 1 and 1 miles east of the proposed haulage route to the coast at Milnet Inlet. The deposit outcrops at an elevation of about 1000 feet above sea level. |
Links to other databases: |
NUMIN; Key value: 037GSW0010 |
Geophysical-chemical signature: |
Signature type: Airborne Magnetometer; Response type: positive (very strong) Signature type: Ground Magnetometer; Response type: positive (very strong) |
References: |
Gross, G. A., 1966 |
The origin of high grade iron deposits on Baffin Island, N.W.T. |
Canadian Mining Journal, Volume 87, p. 111 - 114 |
Hahn, J., 1966 |
Feasibility Study and Cost Estimate, Baffinland Iron Mines Limited, Mary River Area, Franklin (062243) |
Mineral Assessment Report, Baffinland Iron Mines Limited, Indian and Northern Affairs Canada, Publication code 062243 |
Neczkar, E.; Westervelt, R. D., 1963 |
Engineering Field Report No 1 on Mary River Iron Deposits (017056) |
Mineral Assessment Report, Baffinland Iron Mines Ltd, Indian and Northern Affairs Canada, Publication code 017056 |
Sangster, D. F., 1998 |
Mineral deposits compilation and metallogenic domains, northern Baffin Island and northern Melville Peninsula, Northwest Territories |
Geological Survey of Canada, Open File 3635, Scale 1:1000000 |
Watts Griffis and McOuat Ltd., 1983 |
A Summary Report on the Mary River Deposit of Baffinland Iron Mines Ltd. (062161) |
Mineral Assessment Report, Baffinland Iron Mines Ltd., Indian and Northern Affairs Canada, Publication code 062161 |
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