Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI52N04SW00030

Record: MDI52N04SW00030

General

Commodities

Primary Commodities: Gold

Secondary Commodities: Tungsten, Silver

Location

Township or Area: Dome

Latitude: 51° 4' 39.1"    Longitude: -93° 49' 38.76"

UTM Zone: 15    Easting: 442036.65   Northing: 5658772.02    UTM Datum: NAD83

Resident Geologist District: Red Lake

NTS Grid: 52N04SW

Point Location Description: No. 1 Shaft on Claim 87 Map 2074

Location Method: Data Compilation

Access Description: No. 5 Shaft was the main production shaft.

Exploration History

1925: McNeeley Red Lake Holdings exposed the 'Main Shear' on surface. 1931: Coniagas Mines optioned the property and completed diamond drilling. 1933: McKenzie Red Lake Gold Mines took over property, sunk shaft, drifted, and did cross cuts. 1935: Mill came into operation. 1935-1940: 'Main Shear' developed down to 375 m. 1940: North Mine Zone discovered, Main Shear developed to 480 m. 1940-44: North Mine Zone developed down to 315 m. 1951-62: North Mine Zone developed down to 720 m.1956-57: No. 2 Shear Zone explored by a total of 13 underground drill holes from the 165, 225, 255, 315, 345, and 480 m levels and by about 30 m of drifting on the 480 m level. 1956-1982: Little Long Lac Gold Mines owned property. 1962: West Mine Zone discovered. 1966: Mine ceased operation due to exhaustion of ore reserves.

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 'Main Shear' , the 'Hanging Wall Fractures', and the 'No. 2 shear zone' are located in the eastern part of the composite McKenzie Gold-Eagle diorite-granodiorite stock.The 'Main Shear' is a zone of shearing located along a contact between granodiorite and augite diorite. It is crescent shaped; the northern and central parts strike N 5 degs E with an average dip of 35 degs W, and the southern part curves to the SE at S 52 degs E and dips are steeper. Individual shears within the zone pinch out along strike and with depth, but the continuity of the zone is maintained by adjacent shears. The width of the shear zone is from 0.6 to 9 m. The 'Main Shear' contains highly sheared and altered granodiorite, augite diorite, mafic dikes, and irregular masses, and the orebodies consisting of lenses and veins of quartz. The 'Hanging Wall Fractures' (HWFs) consist of fractures subsidiary to the 'Main Shear', and occur 20 to 100 m west of the 'Main Shear' in both augite diorite and granodiorite. Their strike is parallel to the Main Shear but the dips to the west are flatter. Orebodies in the HWFs consist of auriferous quartz lenses and veins which are more regular and continuous than those in the Main Shear or the North Mine. The 'No 2 shear zone' is parallel to the Main Shear, and is located approximately 270 m below it. It consists of a zone of shearing, silicification and quartz veining in augite diorite. It extends from the augite-diorite greywacke contact at 270 m below surface down dip to depths greater than 480 m. It is 300 m long and ranges from 7.5 to 12 m in width. Mineralization occurs in quartz veins and veinlets and in silicified zones.

Lithology

Lithology Comments

Dec 07, 2005 (K R Kettles) - The Main Shear is host to irregular masses, lenses and veins of quartz which are mineralized. Within the shear zone are granodiorite, augite diorite, and mafic dikes.

Mineralization

Mineralization Comments

Dec 07, 2005 (K R Kettles) - MAIN SHEAR:The Main Shear strikes N 5 degs E, and dips 35 degs W on average. It varies from 0.9 to 9 m wide, has been developed along strike for 360 m, and to a depth of 480 m. Oreshoots within the Main Shear consist of overlapping lenses and veins of quartz varying from 6 to 135 m long and 1.5 to 2.5 m wide. The down dip extent of these quartz lenses and veins is usually less than 30 m. The orebodies are located in bulges in the width of the shear zone, and where there are variations in its strike and dip. The best ore shoots are located where the Main Shear slowly follows the augite diorite- granodiorite contact; between the surface and the 165 m level, and between the 375 and 480 m levels. The quartz veins and lenses consist of light grey to white quartz with minor amounts of free gold, sulphide, and telluride minerals. Ankerite occurs above the 255 m level, tourmaline below the 255 m level, and no scheelite was observed above the 195 m level. HANGING WALL FRACTURES: Orebodies within the 'Hanging Wall Fractures' (HWFs) consist of auriferous quartz lenses and veins along discrete fractures. They strike N 5 degs E and dip at less than 35 degs W. The orebodies range in length from 6 to 210 m, and 1.4 to 3 m in width. The down dip extent of individual lenses and veins ranges from 12 to 200 m. The quartz veins and lenses consist of light grey to white quartz with minor amounts of free gold, sulphide and telluride minerals. NO. 2 SHEAR ZONE: The No. 2 shear zone has no ore zones outlined, although gold mineralization occurs in quartz veins and veinlets and in silicified zones in and adjacent to the No. 2 shear zone. It was explored by a few widely spread underground drill holes and a limited amount of drifting. Assays of diamond drill core from the 'No. 2 shear zone' range from trace to 1.23 opt Au/ 0.75 m.

Alteration Comments

Dec 07, 2005 (K R Kettles) - The granodiorite, and augite diorite in and adjacent to the shear zone and Hanging Wall Fractures have been variably carbonatized, sericitized, silicified, and chloritized. The augite diorite within the No. 2 shear zone has been silicified in places. Geochemistry show that addition of Na2O, K2O, H2O, and CO2 and depletion of all other major oxides has occurred in the augite diorite in and adjacent to the 'Main Shear'.

Mineral Record Details

Mineral Zones - Size and Shape

Rank: 1       Structure Type: Shear

Rank: 1       Structure Type: Shear

Rank: 1       Structure Type: Shear

Rank: 1       Structure Type: Shear

Site Visit Information

Date: Jan 29, 1997

Geologist: K R Kettles

Notes: N/A

References

File - Resident Geologist files RL 1936 Burton, F.R.; 1957 McCarthy, P.J.; 1959 Kuryliw, C.J.; 1962-64 Dome #55

Publication Number: Date:

Author:

Publisher Name:

Location: Red Lake RGP office

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:

MonoMap - Geology of Dome Township, District of Kenora

Publication Number: R045 Page: 74-76  Date: 1997

Author: Ferguson S.A.

Publisher Name: Ontario Dept. of Mines

Location:

Part - Gold deposits in the vicinity of Red Lake

Publication Number: ARV44-06.001 Page: 11-17  Date: 1997

Author: Hurst M.E.

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: 211-212  Date: 1971

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

Publisher Name: Ontario Dept. of Mines and Northern Affairs

Location:

Part - Geology and mineral deposits of the Red Lake area

Publication Number: ARV49-02 Page: 156-157  Date: 1998

Author: Horwood H.C.

Publisher Name: Ontario Dept. of Mines

Location:

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

Publication Number: OFR5558 Page: 362-372  Date: 1987

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

Publisher Name: Ontario Geological Survey

Location:

Thesis - Geology of the McKenzie Red Lake Gold mines

Publication Number: MA Thesis Date: 1941

Author: Hoiles, R.G.

Publisher Name: Queen's University

Location:

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