Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI52N04SW00003

Record: MDI52N04SW00003

General

Commodities

Primary Commodities: Gold

Secondary Commodities: Silver, Copper

Location

Township or Area: Fairlie

Latitude: 51° 4' 13.17"    Longitude: -93° 58' 55.37"

UTM Zone: 15    Easting: 431195   Northing: 5658104    UTM Datum: NAD83

Resident Geologist District: Red Lake

NTS Grid: 52N04SW

Point Location Description: Sulphide-bearing, auiferous quartz veins

Location Method: Data Compilation

Access Description: The Alcourt Occurrence is located in central Fairlie Township on the northern side of Red Lake. Located approximately 12 km northwest of the Town of Red Lake, access to the property is via the Pine Ridge Road which passes within 1 km of the occurrence.

Exploration History

1936-37: In 1936, the prospect was owned by Monteray Metals Mining Co. Ltd. and Stupach-Einarson Group. Trenching and Diamond Drilling. 1944: Acquired by Red Lake Area Gold Mines Ltd. Later staked by Colin Campbell and Ridgefield Uranium Mining Corp. Ltd. Ridgefield optioned 50% to Copper-Man. Minim Co. Ltd. 1959-1960: Ridgefield Uranium Mining drilled 16 DDHs on the No.1 Vein. 1960-1965: the property was optioned by Alcourt Minerals Ltd. who conducted trenching, magnetometer survey, and drilled 23 DDH totalling 3048 m. 1973: Dome Exploration Canada Limited worked the prospect and drilled 7 DDH totalling 787.2 m. 1980: Staked by Marc Desmeules and optioned to Sherrit Gordon Mines Ltd. 1981: Sherrit Gordon conducted detailed outcrop sampling as well as a HLEM and a mag survey, drilled 16 DDH and released a resource estimate. 2011: Sphere Resources Inc, optioned the property from Cam McMan Red Lake Gold Mines Ltd. and completed a technical report on the Alcourt Property. The company conducted mag and IP/res surveys on the property, completed removal of the overburden and waste rock from the surface surrounding the veins. The company also completed due diligence samples for data verification.

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

Feb 17, 2015 (K R Kettles) - The prospect is underlain by an interlayered sequence of sandstone, siltstone, and conglomerate beds which have been intruded by an augite diorite stock. The sediments strike NE-SW and dip vertically, to 50 deg. northwards. The augite diorite stock is approximately 200 m wide and 500 m long. It is comprised of equigranular to porphyritic augite diorite. The stock has been intruded by later lamprophyre and diorite dikes. Auriferous quartz veins are present in the stock along faults, shear zones and dilation zones. Post-mineralization faulting has resulted in 1 to 3 inches dislocations in some of the veins. DEPOSIT DESCRIPTION: Four vein systems are present in this prospect. The strike of the quartz veins ranges from 045 to 350 deg. and dips vary between 70 deg. SE and subvertical. The best developed vein, the No. 1 vein strikes north-south dips vertically and has been traced along strike for 120 m. The vein ranges in thickness from a few mm to 1-2 m. GEOPHYSICAL DATA: A weak magnetic anomaly is situated within the diorite measuring about 400 by 60 m.

Dec 07, 2005 (R Tuomi) - The Alcourt occurrence consists of several sulphide bearings, auiferous quartz veins hosted by a small gabbroic stock. The stock intrudes a sequence of north-dipping intermediate volcanic rocks, and clastic sediments consisting of argillites, wackes, and clast supported polymictic conglomerates. The gabbro stock has intruded the country rocks in the vicinity of a high strain zone which parallels the contact of the Hammell Lake Batholith, 1.5 km to the north. The gabbro is a roughly elliptical body with maximum dimensions of 150m by 350m. It consists of a medium-grained, homogenous, melanocratic gabbro in which augite is largely altered to hornblende.

Feb 17, 2015 (Therese Pettigrew) - The Alcourt Property is underlain by rocks of the Slate Bay assemblage (2.9 –2.85 Ga), a sequence of predominantly clastic sediments, with lesser amounts of intermediate volcanic rocks and lamprophyre dykes. Gabbro stocks of limited dimensions intrude the Slate Bay assemblage and appear to be the predominant host of the gold-bearing veins.

Lithology

Lithology Comments

Feb 17, 2015 (K R Kettles) - The prospect is underlain by an interlayered sequence of sandstone, siltstone, and conglomerate beds which have been intruded by an augite diorite stock. The sediments strike NE-SW and dip vertically, to 50 deg. northwards. The augite diorite stock is approximately 200 m wide and 500 m long. It is comprised of equigranular to porphyritic augite diorite. The stock has been intruded by later lamprophyre and diorite dikes. Auriferous quartz veins are present in the stock along faults, shear zones and dilation zones. Post-mineralization faulting has resulted in 1 to 3 inch dislocations in some of the veins. Four vein systems are present in this prospect. The strike of the quartz veins ranges from 045 to 350 deg. and dips vary between 70 deg. SE and subvertical. The best developed vein, the No. 1 vein strikes north-south dips vertically and has been traced along strike for 120 m. The vein ranges in thickness from a few mm to 1-2 m.

Mineralization

Mineralization Comments

Dec 07, 2005 (K R Kettles) - No. 1 vein estimated grade and tonnage 17000 tonnes a 0.2429 oz/t. (8.33 g/t), OFR 5558. P.437 From MDI1: ESTIMATED RESERVES 1959-60: 20,000 TONNES AT 0.45 OUNCES PER METRIC TONNE, ESTIMATED RESERVES 1986: NO.1 VEIN:51 TONNES/VERT.METER @ 0.3554 OZ AU/TONNE, NO.3 VEIN:17.5 T/M @ 0.3255, ESTIMATED RESERVES 1986: NO.1 VEIN:5,000 TONNES @ 1.273 OZ AU/TONNE; 17,000 TONNES @ 0.2429 OZ AU/TONNE.

Feb 17, 2015 (Therese Pettigrew) - Three significant quartz veins are present in this prospect. The best developed vein is the No. 1 vein, which strikes N-S, dips vertically and has been traced along strike for 120 m. The vein ranges in thickness from a few mm to 1-2 m. Grab samples from the vein returned assays of 57.9 g/t Au and 41.1 g/t Ag. The No. 2 vein is parallel to the No. 1 vein and approx. 55 m to the east. The No. 2 vein has a strike length of 65 m and varies in width from 5 to 30 cm. The No. 2 vein extends 10 m to the north of the gabbro contact into the enclosing conglomerate. The No. 3 vein outcrops near the south end of the No.1 vein and trends NE. Mineralization in the vein consists of pyrite and visible gold. The exposed strike length is 25 m with a maximum width of 30 cm. Wall rocks adjacent to the vein are moderately sheared and pyritic. The No. 4 and 5 veins are located 80 m west of the north end of the No. 1 Vein and are postulated to be a parallel set of veins or the northern extension and faulted offset of the No. 1 and No. 2 veins. Gold mineralization on the Alcourt property is associated with quartz flooding (silicification) accompanied by 2-5% fine-grained disseminated pyrite, chalcopyrite and minor arsenopyrite. Incipient carbonatization (dolomite, ankerite) is pervasive both in and surrounding the silicification whereas calcite is dominant throughout the entire greenschist facies. Significant assay results from Ridgefield Uranium Mining in 1959 range from 0.2 to 675.6 g/t Au, with particularly interesting assays including DDH R59-03 from 9.6-9.7 m: 198.1 g/t Au; DDH R59-02 from 19.8-20.0 m: 88.6 g/t Au; DDH R59-08 from 47.1-47.5 m: 84.0 g/t Au; R59-13 from 54.6-54.8 m: 675.6 g/t Au. Significant assays from Alcourt Mineral’s drilling program in the 1960s includes AL-12 from 8.2-8.6 m: 74.0 g/t Au; AL-14 from 20.3-20.1 m: 197.5 g/t Au; AL-14 from 32.3-32.6 m: 189.1 g/t Au; AL-14 from 37.3-37.5 m: 121.0 g/t Au; AL64-04 from 38.9-39.2 m: 98.9 g/t Au.

Alteration Comments

Dec 07, 2005 (K R Kettles) - Magnetite is present in the wall rock adjacent to the auriferous quartz veins.

Mineral Record Details

Mineral Zones - Size and Shape

Rank: 1       Structure Type: Vein

Site Visit Information

Date: Dec 23, 1996

Geologist: K R Kettles

Notes: N/A

References

Publication - Technical Report on the Alcourt Property, Red Lake Mining Division, Ontario, Canada

Publication Number: 2011 43-101 Scale:     Date: 2011

Author: Harron, G.A.

Publisher Name: Sphere Resources

Location: SEDAR

Part - Geology and mineral deposits of the Red Lake area

Publication Number: ARV49-02 Scale:     Date: 1998

Author: Horwood H.C.

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 Scale:     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 Scale:     Date: 1987

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

Publisher Name: Ontario Geological Survey

Location:

Map - Fairlie Township, Kenora District

Publication Number: M2407 Scale: 1:12,000    Date: 1978

Author: Riley R.A.

Publisher Name: Ontario Geological Survey

Location:

Map - Precambrian Geology, Red Lake

Publication Number: P3227 Scale: 1:50,000    Date: 1993

Author: Atkinson B.T., Stone D.

Publisher Name: Ontario Geological Survey

Location:

Map - Geology and gold mineralization, Red Lake greenstone belt

Publication Number: P3107 Scale: 1:50,000    Date: 1991

Author: Durocher M.E., Burchell P.S., Wallace H., Andrews A.J., Hugon H., Atkinson B.T.

Publisher Name: Ontario Geological Survey

Location:

Map - Red Lake area, District of Kenora, geological compilation map

Publication Number: P0338 Scale: 1:63,360    Date: 1997

Author: Ferguson S.A.

Publisher Name: Ontario Dept. of Mines

Location:

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