Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI52N04SW00017

Record: MDI52N04SW00017

General

Commodities

Primary Commodities: Gold

Secondary Commodities: Silver

Location

Township or Area: Dome

Latitude: 51° 3' 47.96"    Longitude: -93° 48' 5.37"

UTM Zone: 15    Easting: 443836.638   Northing: 5657172.003    UTM Datum: NAD83

Resident Geologist District: Red Lake

NTS Grid: 52N04SW

Point Location Description: Shaft on RL 6687 on Map 2074

Location Method: Data Compilation

Access Description: A drift was driven from the 1300 foot level of Cochenour Willans Mine to the Wilmar deposit, a winze was sunk from 1300 level to 2050 level. Actual minning of deposit was done from these workings not the original Rahill Shaft.

Exploration History

1927-28: Martin McNeely Mines incorporated, performs stripping, trenching and drilling.1934-36: Performs stripping, trenching, and drilling. 1944-46: Completed geological mapping, magnetometer surveys and drilling (totalling 10794.26 m by end of 1946). 1958: Wilmar Mines Ltd. is incorporated to take over property, jointly owned by McNeely Mines and Cochenour-Willans Gold Mines. 1960-71: Underground development started from the Cochenour mine 396.5 m level. Drift (totalling 1307 m) driven to Wilmar property. 48000 m of underground drilling completed by 1971. PRODUCTION/ DEVELOPMENT 1960-75: 60,810 OZ AU, 62,752 OZ AG FROM 227,813 T BY DRIVE AT 1300FT , INT.SHAFT 2050FT, ZONES ACCESSED BY WORKINGS INCLUDE: GRANODIORITE (WEST), BRECCIA,CARBONATE (RAHILL) AND DIORITE DIKE (EAST), RESERVES 1973: EAST AREA (B,C,DD) 1,253,200 T @ 0.23 OPTWEST (GDIOR) 5,700,000 T @0.1-0.15 OPT. “Inco: 21,616 feet of surface drilling in 1988. Following underground development and diamond drilling in 1989 and 1990, an 11,923 ton bulk sample was extracted. In 1991, Strathcona Mineral Services estimated a probable resource of 221,500 tons averaging 0.30 oz Au per ton between the 1800 and 2350 levels, and potential for an additional 260,000 tons at the same grade between the 2350 and 2600 levels. A 1991 pre-feasibility study by Inco indicated that the resources on the Cochenour property were not economic. In February 1998, Goldcorp completed its acquisition of all of the outstanding shares of Wilanour Resources Limited. Surface exploration work began again in January 2007 by Premier Gold Mines on the newly expanded joint venture property. In total 19 holes and 24 wedges were drilled targeting the both the West Granodiorite Zone and East Breccia Zone at depth beneath the old workings and laterally east and west of the zone. This drilling totaled 21,528.5 m and represented the first deep drilling completed under the Wilmar Mine. 2009 Gold Corp and Premier conducted a 17 DDH program completing 6807 m.” (taken form assessment report 2.44933)

Assessment Work on File

Geology

Province: Superior

Subprovince: Uchi

Terrane: North Caribou

Domain: Uchi

Belt: Red Lake

Geological Age: Archean  

Metamorphism Type: Regional

Metamorphism Grade: Greenschist

Geology Comments

Dec 07, 2005 (K R Kettles) - The northern half of the Wilmar property is underlain by altered mafic flows, whereas the southern half is underlain by felsic metavolcanic flows and flow breccias. The units strike about N65 degs E and dip steeply south. On the basis of pillow packing stratigraphic tops are to the south. The Wilmar mineralized zones are found at or close to the contact between a silicified, felsic volcanic breccia and talc-chlorite-carbonate schist. The contact is thought to be a major fault zone. Rolls in the contact between the two rock sequences have been found to be an important guide to ore. Diorite, lamprophyre and diabase dikes/sills are present in all parts of the sequence.

Lithology

Lithology Comments

Dec 07, 2005 (K R Kettles) - In the granodiorite zone a granodiorite body over 180 m long in strike contains mineralized veins. The body is 10 to 36 m wide. It is proably a dike or sill.

Mineralization

Mineralization Comments

Mar 15, 2012 (K R Kettles) - GRANODIORITE ZONE:The granodiorite body is 180 m long and varies from 10 to 36 m wide. Gold mineralization is associated with multi-directional, quartz-tourmaline veins of limited extent. The dips of the veins is variable, with horizontal and 35 to 60 degs S dipping veins dominant. Mineralization consists of py and po with trace cp and tellurides. Published grades of this zone vary from 0.10 to 0.15 opt Au. From surface to the 625.25 m level there is an estimated 5,700,000 tons of ore. DIORITE DIKE ZONE:The mineralized zones occur within diorite dikes in the volcanic breccia zone. The mineralization is associated with quartz-carbonate veinlets cutting the dikes in a multitude of directions. Visible gold is present. Possible ore reserves are estimated at 140,000 tons grading 0.21 opt Au. BRECCIA ZONE:Mineralized zones are located at the talc-chlorite-carbonate schist and brecciated silicified volcanic contact.Mineralization occurs in minute dolomitic stringers which lace the siliceous breccia and schist. The intensity of mineralization and grade increases in the vicinity of the rolls in the contact. The average Au to Ag ratio is 1:10. The breccia pipe zones are zones of intense shearing and brecciation where the rocks are silicified and sericitized. They may represent fault displacement of the breccia-schist contact zones, and have Au:Ag ratios of 1:1. Proven ore from this zone is 31500 tons of 0.32 opt Au. CARBONATE ZONE:The carbonate zones are located west of the volcanic breccia zone. The mineralized zones contain primarily tellurides with some visible gold. The average Au to Ag ratio is 1:7. The dimensions and shape of the zones are extremely variable. Probable ore reserves from this zone is 25000 tons of 0.17 opt Au. 2009: Drilling in the area, 8 drill holes, assays returning ranging up to 9.13 g/t Au over 4m, and 10.20 g/t over 0.5 m.

Alteration Comments

Dec 07, 2005 (K R Kettles) - The granodiorite adjacent to the auriferous quartz tourmaline veins has been bleached and sericitized. The diorite dikes and other country rocks have been silicified and carbonatized.

Mineral Record Details

Mineral Zones - Size and Shape

Rank: 1       Structure Type: Contact

Rank: 2       Structure Type: Breccia

Rank: 1       Structure Type: Vein

Rank: 3       Structure Type: Breccia

Rank: 1       Structure Type: Contact

Rank: 2       Structure Type: Shear

Rank: 1       Structure Type: Vein

Site Visit Information

Date: Jan 30, 1997

Geologist: K R Kettles

Notes: N/A

References

File - Red Lake Resident Geologists Files 1945 Dome #22

Publication Number: AF RL 1945 Date: 1945

Author:

Publisher Name:

Location: Red Lake RGP

Map - Dome Township, Kenora District

Publication Number: M2074 Scale: 1:12,000    Date: 1997

Author: Ferguson S.A.

Publisher Name: Ontario Dept. of Mines

Location:

File - Red Lake Resident Geologists Files 1959 Dome #41

Publication Number: AF RL 1959 Date: 1959

Author:

Publisher Name:

Location: Red Lake RGP

File - Red Lake Resident Geologists Files 1980 Dome #77

Publication Number: AF RL 1980 Date: 1980

Author:

Publisher Name:

Location: Red Lake RGP

File - Red Lake Resident Geologists Files 1981 Dome #105

Publication Number: AF RL 1981 Date: 1981

Author:

Publisher Name:

Location: Red Lake RGP

File - Red Lake Resident Geologists Files 1984-85 Dome #114

Publication Number: AF RL 1984 Date: 1984

Author:

Publisher Name:

Location: Red Lake RGP

File - Red Lake Resident Geologists Files 1985 Dome #135

Publication Number: AF RL 1985 Date: 1985

Author:

Publisher Name:

Location: Red Lake RGP

File - A Study of Exploration Possibilities and the Potential Economic Objectives; Assessment file 52N04SW0077, AFRO 63.3179

Publication Number: AFRI52N04SW0077 Date: 1973

Author: Hutton, D.A.

Publisher Name: Wilmar Mines Ltd.

Location: http://www.geologyontario.mndm.gov.on.ca/mndmfiles/afri/data/imaging/52N04SW0077/52N04SW0077.Pdf

Part - Gold deposits in the vicinity of Red Lake

Publication Number: ARV44-06.001 Page: 24-25  Date: 1997

Author: Hurst M.E.

Publisher Name: Ontario Dept. of Mines

Location:

Part - Geology and mineral deposits of the Red Lake area

Publication Number: ARV49-02 Page: 182-184  Date: 1998

Author: Horwood H.C.

Publisher Name: Ontario Dept. of Mines

Location:

MonoMap - Geology of Dome Township, District of Kenora

Publication Number: R045 Page: 86-88  Date: 1997

Author: Ferguson S.A.

Publisher Name: Ontario Dept. of Mines

Location:

Mono - Gold deposits of Ontario, part 1, districts of Algoma, Cochrane, Kenora, Rainy River, and Thunder Bay

Publication Number: MDC013 Page: 215-216  Date: 1971

Author: Ferguson S.A., Groen H.A., Haynes R.

Publisher Name: Ontario Dept. of Mines and Northern Affairs

Location:

Mono - Gold occurrences, prospects, and deposits of the Red Lake area, volumes 1 and 2

Publication Number: OFR5558 Page: 381,394,398-401  Date: 1987

Author: Durocher M.E., Burchell P.S., Andrews A.J.

Publisher Name: Ontario Geological Survey

Location:

File - 1973 Resident Geologist's Files, Red Lake

Publication Number: AF RL 1973 Date: 1973

Author: Hutton, D.A.

Publisher Name:

Location: Red Lake RGP

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For detailed information regarding this mineral record please contact the Red Lake Resident Geologist District Office