Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI52N04SW00045

Record: MDI52N04SW00045

General

Commodities

Primary Commodities: Gold

Location

Township or Area: Dome

Latitude: 51° 1' 14.11"    Longitude: -93° 52' 3.8"

UTM Zone: 15    Easting: 439139.82   Northing: 5652472.43    UTM Datum: NAD83

Resident Geologist District: Red Lake

NTS Grid: 52N04SW

Point Location Description: Precise/SHAFT/TR

Location Method: Data Compilation

Access Description: Access from Red Lake is via forestry road to the Goldshore mine, then west along an exploration road for 3 km to the Peterson Skookum Bay property

Exploration History

1935-36: Skookum Gold Mines trenched and stripped on property. 1936-37: Competed 23 drill holes totalling 1919 m. 1937: Sunk shaft to 57 m but no lateral development was extended from the shaft. 1946: Clifton Consolidated Mines drilled 4 holes totalling 96 m. 1963: B. Crawfor drilled 2 holes totalling 109.5 m. 1971: Cochenour Willans Gold Mines Ltd. conducted VLF-EM and IP surveys. 1981: Gold Fields Resources performed Geology, geophysics, and drilled 8 DDH totalling 1242.8 m. 1983: C. Peterson carried out trenching, mapping, and sampling. 1985-86: C. Peterson carried out stripping and sampling. 1991: C. Peterson carried out trenching sampling, and drilled 2 DDH totalling 98.17 m. 1993: C Peterson drilled 1 DDH totalling 153.05 m. 2012-14: Goldcorp Canada carried out sampling.

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 prospect is located in the SE part of the Dome stock. In the vicinity of the prospect granite-granodiorite is cut by numerous N70degs E striking diorite and granodiorite dikes. To date 11 auriferous quartz veins and stringers have been discovered. 9 of these are located along N 30 degs W striking fractures or shear zones. The other 2 veins occur along N 70 degs E striking fractures and shear zones and are associated with diorite dikes. Some of the veins appear to occupy a single well defined fracture whereas others are located in zones 0.3 to 1.5 metres wide of closely spaced anastamosing fractures along which there has been minor displacement. There are gradations between single fractures and shear zones along strike. Alteration of the wall rocks adjacent to the quartz veins is common. Alteration envelopes are best deveoloped adjacent to veins occupying shear zones. GEOPHYSICS: The prospect is located in an area in which the magnetic contours are very irregular as compared to the contours in the rest of the Dome stock.

Lithology

Lithology Comments

Dec 07, 2005 (K R Kettles) - The rocks in the vicinity of the propect consist of pink massive granite to granodiorite.

Mineralization

Mineralization Comments

Dec 07, 2005 (K R Kettles) - The auriferous quartz veins are composed mainly of grey to white glassy quartz with minor amounts of FE-carbonate, pyrite, chalcopyrite, tetrahedrite, malachite, and gold. Nine of the veins strike N 30 degs W and two strike N 70 degs E. Dips of all veins are subvertical. The veins vary in width from 2 cm to 1.8 m and pinch and swell considerably along strike and with depth. They vary in length from 10 to 510 m. Veins occupying single fractures tend to have narrower and more consistent widths than those occupying shear zones. Narrow subparallel quartz stringers are common adjacent to some of the veins occupying shear zones. Assays from 9 of the veins are as follows: Vein 1 - 285 m exposure, channel samples range from 0.02 to 2.96 opt Au. Vein 2 - 15 m exposure, channel samples range from 0.2 to 1.72 opt Au. Vein 3 - exposed in 12 m cross trench, channel samples range from 0.20 to 2.34 opt Au. Vein 4 - 66 m exposure, channel samples from 0.03 - 0.04 opt Au. Vein 5 - 130 m exposure, channel samples range from 0.02-0.91 opt Au. Vein 6 - 24 m exposure, channel samples range from 0.34 -0.93 opt Au. Vein 7 - 24m exposure, channel samples contained no gold. Vein 8 - 65 m exposure, channel samples range from nil - 0.10 opt Au. Vein 9 - 134 m exposure, channel samples range from 0.12-0.18 opt Au. The best values occur in association with chalcopyrite and tetrahedrite.

Nov 30, 2020 (Therese Pettigrew) - DDH 2 drilled in 1991 returned up to 11.7 g/t Au over 2.1 m and 11.6 g/t Au over 1 m from the No. 5 quartz vein (Assessment report 52N04SW9950). Grab samples taken in 1993 returned up to 0.56 oz/t Au from the No. 2 vein and 1.16 oz/t Au from the No. 5A vein (Assessment report 52N04SW0015). Sampling done in 1983 returned several assays over 1 oz/t Au, including results up to 18.42 oz/t Au (631.4 g/t Au) (Assessment report 52N04SW0034). Sample A692227 taken in 2012 near the Skookum Shaft area returned 14.824 g/t Au from a blue-grey quartz vein with sulphides (Assessment report 20000008645). The 150 degree set of quartz veins and stringers was the dominant target of the early work. All veins that have been discovered to date are narrow, on the order of a few centimetres, up to 10 cm. However, gold assays in the ounces range have been obtained from grab samples of the veins, undoubtedly due to nugget effect. Pyrite and minor chalcopyrite are common gangue minerals in the veins. The very narrow width of the veins and erratic distribution of contained gold means that unless continuity of high grade veins can be demonstrated, wall rock dilution would make them uneconomic for mining. A number of them are, however, located within ductile shear zones in places up to 2 m wide. The #1 vein extends southward from the south shore of Skookum Bay. Horwood (1945) reported assays up to 0.45 ounce gold per ton from the vein. It has been mapped at a scale of 1:10 along a 21.5 m length. Correlation has been made across Skookum Bay with a vein on the north side, so that it is estimated to be at least 330 m long. The #5 vein, between the shaft and the #1 vein, appears to be two converging narrow veins. Mr. Peterson reports (personal communication, 1997) he got an assay of 28 ounce gold per ton from this system, but also numerous assays >1 ounce gold per ton. The writer collected several pieces of quartz with pyrite, chalcopyrite and visible gold randomly along a 3 m length of the vein. The combined sample (Geoscience Laboratories, Ontario Geological Survey) assayed 51 000 ppb Au (1.49 ounces gold per ton). The #8 vein is up to 5cm wide, but in a zone of shearing about 1.5m wide, mostly on its west side. Foliation--feathering adjacent to and on west side of the vein indicates right lateral movement along the shear zone. Mr. Peterson (personal communication, 1998) has got assays up to 4 ounces gold per ton from this vein. A grab sample taken by Mr. Peterson from the vein and submitted by the writer for assay returned 14.81 ounces gold per ton (Geoscience Laboratories, Ontario Geological Survey). Further evidence of dextral movement along the shear is indicated by fault offset on a mafic dike cut at a high angle by the shear. At the #12 vein, the shear zone is on the order of 1 metre wide and is occupied by numerous quartz stringers and veins, with crack--and--seal texture indicating a protracted emplacement history. Right lateral movement on it is again indicated by the rotation of shear fabric into the quartz vein. This vein appears to be the most continuous of the veins discovered to date. It does not appear to have been uncovered in the early work (ie. prior to 1940), unless it is the same vein as the #10 vein. A chip sample taken by OGS staff member C. Blackburn across the width of the zone, containing both quartz vein and wall rock material, assayed 140 ppb Au (Blackburn et al., 1999).

Alteration Comments

Dec 07, 2005 (K R Kettles) - The granite rocks adjacent to the quartz veins have been sericitized and are light grey in color. In places they have also been silicified and contain appreciable amounts of finely disseminated pyrite. Alteration zones adjacent to veins occupying single fractures are generally less than 30 cm in width, whereas those developed adjacent to veins in shear zones vary between 0.3 and 1.5 m in width. Hydrothermal alteration envelopes adjacent to the quartz veins are not symmetrically developed with respect to the veins and vary considerably in extent on both sides and along the strike of the veins. Alteration envelopes are best developed adjacent to veins occupying shear zones. There is no apparent relationship between the extent of hydrothermal alteration, and the width of the quartz veins.

Mineral Record Details

Mineral Zones - Size and Shape

Rank: 2       Structure Type: Shear

Rank: 1       Structure Type: Vein

Site Visit Information

Date: Jan 24, 1997

Geologist: K R Kettles

Notes: N/A

References

File - Resident Geologist files 1936-38 Dome #30A

Publication Number: Date:

Author:

Publisher Name:

Location: Red Lake RGP office

Map - Red Lake area, District of Kenora, airborne electromagnetic survey, total intensity magnetic survey [Dome Township]

Publication Number: P1579 Scale: 1:20,000    Date: 1978

Author: Questor Surveys Ltd.

Publisher Name: Ontario Geological Survey

Location:

MonoMap - Geology of Dome Township, District of Kenora

Publication Number: R045 Page: 48-49  Date: 1997

Author: Ferguson S.A.

Publisher Name: Ontario Dept. of Mines

Location:

Part - Geology and mineral deposits of the Red Lake area

Publication Number: ARV49-02 Page: 77-79  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: 346-347  Date: 1987

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

Publisher Name: Ontario Geological Survey

Location:

Mono - Report of Activities 1998, Resident Geologist Program, Red Lake Regional Resident Geologist Report: Red Lake and Kenora Districts

Publication Number: OFR5987 Page: 20-23  Date: 1999

Author: Blackburn C.E., Hinz P., Storey C.C., Kosloski L., Ravnaas C.

Publisher Name: Ontario Geological Survey

Location:

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