Ontario Geological Survey
Permanent Link to this Record:
MDI52N04SW00018
| Record Name(s) | Red Lake Operations - Cochenour Complex - 2020, Cochenour Willans Mine - 1983, Wilanour Resources Mine - 1987, No.1 Shaft - 1983 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Producing Mine |
| Date Created | 1983-Sep-14 |
| Date Last Modified | 2024-Feb-15 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Secondary Commodities: Silver
Township or Area: Dome
Latitude: 51° 4' 39.59" Longitude: -93° 48' 29.39"
UTM Zone: 15 Easting: 443386.65 Northing: 5658772.02 UTM Datum: NAD83
Resident Geologist District: Red Lake
NTS Grid: 52N04SW
Point Location Description: Shaft on KRL 322 in Cochenour townsite Map 2074
Location Method: Conversion from MDI
Access Description: Municipal streets from Highway 125.
1922: F. Carroll and H. Tyrrell staked 9 claims but were unable to raise capital to do further development, so let the claims revert to the Crown. 1926: the Cochenour brothers and D. Willans staked claims. 1927-28: Cochenour brothers & D. Willans prospected and worked on their property. 1928: Cochenour Willans Syndicate formed and began surface stripping and trenching. 1932: Hollinger Consolidated Gold Mines optioned property, performed surface development and some diamond drilling. 1934: Surface work. 1935: Shaft sunk to 95.16 m and 2 levels established. 1936-37: Cochenour Willans Gold Mines was incorporated, carried out underground development. Apprx. 10,000’ of DD done. 1939: 3-compartment shaft deepened to 400’. Mill was constructed and production began at a rate of 150 to 200 tpd. First gold bar was poured on Dec. 23, 1939. 1963: Mill rate was up to 292 tpd average. No. 1 shaft deepened to 685.53 m with 18 developed levels. 1971: Production Mining operations ceased Aug 31, 1971 1975: Mine closed and was allowed to flood. 1979: Name changed to Willanour Resources. 1980: Joint venture agreement signed with Camflo Mines. Mine was dewatered and surface plants and the shaft rehabilitated down to the 1,300 ft level. 1981: Camflo conducted surface and underground exploration, drilling, geological mapping and geophysics.1982: Further work was suspended until financing could be arranged. 1983: Camflo Mines owns 67% of company. 1984: Wilanour, Annco & Wilmar formed Wilanour Partnership. Esso Minerals signed a joint venture agreement. Esso completed over 20,000 ft DD, confirmed the zone extends 575 ft below the existing workings and is open at depth. 1985: Esso expended $6.6 million and earned 65.5% interest in the mineral rights. Underground exploration indicated further exploration wasn’t warranted at the time. Mine was allowed to flood. 1987: drill program conducted from ice between Cochenour and McKenzie Island in March.1987: Inco Gold acquired Esso’s interests & rights. 1988-89: Inco dewatered mine to 2,200 ft, underground mapping and DD. 1990: Inco completed phase II of underground exploration program. Mining tests were carried out in previously unmined areas on 1800, 2050 and 2200 levels.1991: joint venture terminated June 1991. Property held 30% Wilanour Resources, 50% TVX Gold Inc, 12.5% Pronto Explorations Ltd. and 7.5% R.H. Fasken.1992: property on care & maintenance. 1995: In July, Wilanour Resources signed an agreement to sell mining assets to Goldcorp Inc. 1997: In March, Goldcorp acquired 58% interest in the Wilanour Joint Venture. 1998: Goldcorp acquired remaining interest in Wilanour Resources. Goldcorp now owns 100% of former Cochenour Mine property. 1999: Goldcorp drilled 9 DDH totalling 8,228 ft and conducted an exploration program including trenching, mapping, soil geochemistry, compilation of historical data, and geophysical surveys including regional airborne magnetometer/EM/radiometric survey. 2001: Goldcorp drilled 20 DDH totaling 42125 ft on eastern and NE portion of Cochenour mine property. 2002: Goldcorp drilled 17 DDH totalling 22,288 ft on eastern & NE portion of Cochenour property. 2003: Goldcorp drilled 11 DDH and deepened 2 previous holes for a total of 4,000 m. 2004: Goldcorp drilled 3 DDH for a total of 1,636 m on the depth extension of Cochenour Mine. 2008: Goldcorp acquired the Bruce Channel deposit from Gold Eagle Mines. 2009: Goldcorp began dewatering the Cochenour Mine to facilitate exploration of the Bruce Channel deposit. 2011: Goldcorp dewatered Cochenour mine to 2800 level, built a new headframe, excavated the Cochenour shaft and completed the Cochenour surface site infrastructure for its plans to connect the Bruce Channel deposit to the existing Cochenour shaft via a high-speed tramway. 2020: Evolution Mining Ltd. acquired the mine and is part of the Red Lake Operations including Campbell, Balmer Complex, Cochenour. McFinely included in the operations in 2021.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 52N04SW0097 | 20000005544 | 20000005544 |
| 48 | 52N04SW0019 | 52N04SW0019 |
| 22 | 52N04SW0098 | 52N04SW0098 |
| 63.3176 | 52N04SW0305 | 52N04SW0305 |
| 63.4637 | 52N04SW0001 | 52N04SW0001 |
| 63.3809 | 52N04SW0057 | 52N04SW0057 |
| 52N04SW0073 | 20000005540 | 20000005540 |
| 63.5158 | 52N04SW0009 | 52N04SW0009 |
Province: Superior
Subprovince: Uchi
Terrane: North Caribou
Domain: Uchi
Belt: Red Lake
Geological Age: Archean
Metamorphism Type: Regional
Metamorphism Grade: Greenschist
Dec 07, 2005 (K R Kettles) - The property is underlain primarily by altered mafic metavolcanic flows, with minor interflow chemical and clastic sedimentary rocks. Quartz and quartz-feldspar porphyry, and later mafic dikes are common. The amount of alteration (carbonatization and silicification) in the mafic volcanics varies considerably, and in some localities, the highly altered mafic flows appear to be intermediate to felsic in composition. The bands of iron formation are the only reliable horizon markers for determining stratigraphy and structure in the area. They have a maximum width of about 3 m. Quartz porphyry occurs as a small stock-like mass NW of the mine and as lenses and dikes in the volcanic rocks. The various lithologies have been so completely deformed and altered that their attitudes are highy variable. They strike E-W to NE-SW and dip steeply south. The ore horizon at the Cochenour Mine has been described as an over-thrust Fault Zone that was subsequently folded, sheared, refolded and faulted to obtain its present NW-SE attitude. Associated with this structure are ore structures in the immediate hanging wall and footwall mafic volcanic rocks. The structures include banded carbonate veins, narrow shear veins conformable to regional shearing, replacement structures and carbonate veins in the footwall, silicified and carbonatized lenses in talc-schist, silicified chert structures striking E-W to N 60 degs W and dipping 85 degs N, and silicified granular structures along the hanging wall and footwall of the talc-schist portion of the over-thrust Fault Zone.
| Rock Type | Rank | Composition | Texture | Relationship | Mafic massive flow | 1 | Altered Basalt | Massive | Contains |
|---|---|---|---|---|
| Magnetite Ironstone | 2 | Slatey Chert-Magnetite | Iron Formation | Near |
| Vein | 3 | Carbonate-Quartz | Lenses | Host |
Dec 07, 2005 (K R Kettles) - The mafic metavolcanics are massive, fine to medium grained green rocks composed of chlorite, sericite, carbonate, and limonite. The iron formation bands are about 3 m wide and contain thin cherty quartz, slate, and magnetite layers. The quartz porphyry bodies range from a normal porphyry with small quartz eyes to a fine grained massive rock.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Arsenopyrite | Economic | Ore | ||||
| 2 | Boulangerite | Economic | Ore | ||||
| 3 | Cobaltite | Economic | Ore | ||||
| 4 | Chalcopyrite | Economic | Ore | ||||
| 5 | Gold | Economic | Ore | ||||
| 6 | Pentlandite | Economic | Ore | ||||
| 7 | Pyrite | Economic | Ore | ||||
| 8 | Pyrrhotite | Economic | Ore | ||||
| 9 | Rutile | Economic | Ore | ||||
| 10 | Sphalerite | Economic | Ore | ||||
| 11 | Tetrahedrite | Economic | Ore | ||||
| 12 | Silver | Economic | Ore | ||||
| 13 | Stibnite | Economic | Ore | ||||
| 1 | Quartz | Economic | Gangue | ||||
| 2 | Carbonate | Economic | Gangue | ||||
| Carbonate | Alteration | Carbonatization | 1 | Unknown | Disseminated | ||
| Silica | Alteration | Silicification | 2 | Unknown | Disseminated | ||
| Sericite | Alteration | Sericitization | 3 | Unknown | Disseminated |
Dec 07, 2005 (K R Kettles) - The main over-thrust Fault Zone consists of quartz-carbonate lenses that have been considerably faulted and folded. The zone has been traced for approximately 1300 m striking NW-SE. The dip of the zone varies considerably depending on the amount of folding and/or faulting that has occurred, but averages between 30 to 45 degs SW. Individual ore lenses in the zone strike almost perpendicular to the general strike of the zone. Between the years 1939 to 1975 the Mine produced: 1,131,689 OZ AU, 50,126 OZ AG FROM APP. 2,129,371 T MILLED(0.53 OPT AU,0.023 OPT AG).
Dec 07, 2005 (K R Kettles) - All of the volcanic rocks have been highly carbonatized, silicified, and sericitized.
| Shape | Length | Thickness | Depth | Strike | Dip | Plunge | Trend | Age | Reference |
|---|---|---|---|---|---|---|---|---|---|
| Unknown | 1300 | 685 | 135 | 40 |
Date: Feb 03, 1997
Geologist: K R Kettles
Notes: N/A
| Zone | Year | Category | Tonnes | Reference | Comments | Commodities |
|---|---|---|---|---|---|---|
| Cochenour | 2023 | Inferred Mineral Resource | 5680000 | Evolution Mining Ltd., news release, February 14, 2024. | Grade 4.94 g/t for 902,000 oz Au, with a cut-off grade of 2.7 g/t Au. | |
| Cochenour | 2023 | Indicated Mineral Resource | 1470000 | Evolution Mining Ltd., news release, February 14, 2024. | Grade 5.91 g/t for 280,000 oz Au, with a cut-off grade of 2.7 g/t Au. | Gold 5.91 g/t |
| Cochenour | 2023 | Probable Mineral Reserve | 700000 | Evolution Mining Ltd., news release, February 14, 2023. | Grade 6.12 g/t for 129,000 oz Au. | Gold 6.12 g/t |
| Cochenour | 1994 | Proven + Probable Reserve | 156940 | Northern Miner December 12 1994 p. 7 | Grade: 17.5 g/t Au (173 000 ton at 0.51 opt Au) | Gold 17.48 g/t |
| Cochenour | 1994 | Possible | 248570 | Northern Miner December 12 1994 p. 7 | Grade: 20.2 g/t Au (274 000 tons of 0.59 opt Au) | Gold 20.23 g/t |
| Year | Tonnes | Commodities | Reference | Comment |
|---|---|---|---|---|
| 1975 | 2311850 |
Gold 1131689 Ounces |
OFR 5558 P. 431 | TOTAL PRODUCTION FROM YEARS 1939 TO 1975. Grade: 15.8 g/t Au (0.46 opt Au) Total production 1,131,689 oz Au |
| 1971 | 14719 |
Silver 21146 Ounces Gold 18133.5 Ounces |
Canadian Mines Handbook 1972-73, p. 82 | Milled 8,411 t ($97,345) from Annco, 44,581 t ($459,642) from Wilmar and 14,719 t ($134,355) from Cochenour Willans for a total of 67,711 t ($691,342), giving 18,133.5 oz Au and 21,146 oz Ag. Mill operations ceased Oct 7, 1971. |
| 1970 | 18575 |
Gold 21520.88 Ounces |
Canadian Mines Handbook 1971-72, p. 99-100 | Milled 8441 t ($121,194) from Annco, 67,246 t ($718,058) from Wilmar and 18,575 t ($112,509) from Cochenour- Willans for a total of 94,262 t ($773,891) |
| 1969 | 14147 |
Gold 18829.46 Ounces |
Canadian Mines Handbook 1970-71, p. 93 | Milled 12,359 t ($136,202) from Annco, 45,068 t ($553,439) from Wilmar and 14,147 t ($84,250) from Cochenour Willans for a total of 71,574 t ($773,891). |
| 1968 | 43620 |
Gold 23421.67 Ounces |
Canadian Mines Handbook 1969-70, p. 90 | Milled 27,922 t ($359,206) from Annco, 28,018 t ($247,831) from Wilmar and 43,620 t ($313,669) from Cochenour Willans for a total of 99,630 t ($920,706) |
| 1967 | 71434 |
Gold 36642.35 Ounces |
Canadian Mines Handbook 1968-69, p. 84 | Milled 39,924 t ($570,465) from Annco, 8,522 t ($89,076) from Wilmar, and 71,434 t ($621,109) from Cochenour Willans for a total of 119,880 t ($1,280,650). |
| 1966 | 64613 |
Gold 36206.77 Ounces |
Canadian Mines Handbook 1967-68, p. 83 | Milled 42,133 t ($581,670) from Annco and 64,613 t ($690,274) from Cochenour Willans for a total of 106,746 t ($1,271,944). |
| 1965 | 93617 |
Gold 41950.74 Ounces |
Canadian Mines Handbook 1966-67, p. 80 | Milled 10,053 t from Annco and 93,617 t from Cochenour Willans Mine for a total of 103,670 t ($1,473,310) |
| 1964 | 101910 |
Gold 61414.62 Ounces |
Canadian Mines Handbook 1965, p. 77-78 | Recovered $2,155,653 of gold. |
| 1963 | 106634 |
Gold 80725.36 Ounces |
Canadian Mines Handbook 1964, p. 77 | Recovered $2,832,653 of gold. |
| 1962 | 100001 |
Gold 81241.47 Ounces |
Canadian Mines Handbook 1963, p. 76 | Recovered $2,862,137 of gold. |
| 1961 | 96155 |
Gold 80130.41 Ounces |
Canadian Mines Handbook 1962, p. 55 | Recovered $2,824,597 of gold. |
| 1960 | 90010 |
Gold 72103.63 Ounces |
Canadian Mines Handbook 1961, p. 54 | Recovered $2,543,095 of gold. |
| 1959 | 84004 |
Gold 64982.93 Ounces |
Canadian Mines Handbook 1960, p. 57-58 | Recovered $2,280,901 of gold. |
| 1958 | 77804 |
Gold 60976.04 Ounces |
Canadian Mines Handbook 1959, p. 52-53 | Recovered $2,140,259 of gold. |
| 1957 | 75550 |
Gold 58348.98 Ounces |
Canadian Mines Handbook 1958, p. 62 | Recovered $2,039,297 of gold. |
| 1956 | 70520 |
Gold 45024.92 Ounces |
Canadian Mines Handbook 1957, p. 63 | Recovered $1,575,422 of gold. |
| 1955 | 68521 |
Gold 35147.45 Ounces |
Canadian Mines Handbook 1956, p. 61 | Recovered $1,231,215 of gold. |
| 1954 | 66045 |
Gold 24111.5 Ounces |
Canadian Mines Handbook 1955, p. 46-47 | Recovered $844,867 of gold. |
| 1953 | 61680 |
Gold 27187.92 Ounces |
Canadian Mines Handbook 1954, p. 46 | Recovered $947,227 of gold. |
| 1952 | 67361 |
Gold 36580.92 Ounces |
Canadian Mines Handbook 1953, p. 46 | Recovered $1,265,700 of gold. |
| 1951 | 70531 |
Gold 37631.08 Ounces |
Canadian Mines Handbook 1952, p. 44-45 | Recovered $1,306,551 of gold. |
| 1950 | 71171 |
Gold 41753.23 Ounces |
Canadian Mines Handbook 1951, p. 53-44 | 12 month production to Dec 31, 1950. Recovered $1,449,672 of gold. |
| 1949 | 83891 |
Gold 33815.4 Ounces |
Canadian Mines Handbook 1950, p. 51 | 12 month production to Dec 31, 1949. Recovered $1,071,610 of gold. |
| 1948 | 109726 |
Gold 43353.62 Ounces |
Canadian Mines Handbook 1949, p. 50-51 | 12 month production to May 31, 1948 plus 7 month production to Dec 31, 1948. Recovered $1,504,804 of gold total. |
| 1947 | 62915 |
Gold 28682.74 Ounces |
Canadian Mines Handbook 1948, p. 51-52 | 12 month production to May 31, 1947. Recovered $995,578 of gold. |
| 1946 | 39274 |
Gold 15629.04 Ounces |
Canadian Mines Handbook 1947, p. 72-73 | 12 month production to May 31, 1946. Recovered $542,484 of gold. |
| 1945 | 38766 |
Gold 19347.85 Ounces |
Canadian Mines Handbook 1946, p. 74-75 | 12 month production to May 31, 1945. Recovered $671,564 of gold. |
| 1944 | 53886 |
Gold 30475.33 Ounces |
Canadian Mines Handbook 1945, p. 58 | 12 month production to May 31, 1944. Recovered $1,031,590 of gold. |
| 1943 | 57619 |
Gold 35098.88 Ounces |
Canadian Mines Handbook 1944, p. 43 | 12 month production to May 31, 1943. Recovered $1,188,097 of gold. |
| 1942 | 62330 |
Gold 33511.43 Ounces |
Canadian Mines Handbook 1943, p. 43 | 12 month production to May 31, 1942. Recovered $1,134,362 of gold. |
| 1941 | 57389 |
Gold 26523.57 Ounces |
Canadian Mines Handbook 1942, p. 44 | 12 month production to May 31, 1941. Recovered $897,823 of gold. |
| 1940 | 39923 |
Gold 18475.3 Ounces |
Canadian Mines Handbook 1941, p. 41 | Jan-Sept 1940 prod. Recovered $625,389 of gold. |
| 1939 | 9070 |
Gold 3635.65 Ounces |
Canadian Mines Handbook 1941, p. 41 | Recovered $125,139 of gold. |
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 1948-72 Dome #10
Publication Number: AF RL 1948 Date: 1948
Author:
Publisher Name:
Location: Red Lake RGP
Part - Geology and mineral deposits of the Red Lake area
Publication Number: ARV49-02 Page: 80-96 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: 51-56 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: 206-207 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: 430-431 Date: 1987
Author: Durocher M.E., Burchell P.S., Andrews A.J.
Publisher Name: Ontario Geological Survey
Location:
Book - Northern Miner Dec 12 1994
Publication Number: NM Page: 7 Date: 1994
Author:
Publisher Name:
Location:
Map - Geology and Tectonostratigraphic Assemblages, East Uchi Subprovince, Red Lake and Birch-Uchi Belts, Ontario
Publication Number: P3460 Scale: 1:250,000 Date: 2004
Author: Sanborn-Barrie M., Rogers N., Skulski T., Parker J.R., McNicoll V.J., Devaney J.R.
Publisher Name: Geological Survey of Canada, Ontario Geological Survey
Location:
Map - Geological map of Dome Township, District of Kenora (Patricia Portion), Ontario
Publication Number: M1951A Scale: 1:31,680 Date: 1997
Author: Chisholm E.O.
Publisher Name: Ontario Dept. of Mines
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 - Dome Township
Publication Number: P0125 Scale: 1:12,000 Date: 1997
Author: Ferguson S.A.
Publisher Name: Ontario Dept. of Mines
Location:
Map - Precambrian Geology, Dome Township
Publication Number: OFM0231 Scale: 1:12,000 Date: 1993
Author: Atkinson B.T.
Publisher Name: Ontario Geological Survey
Location:
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