Ontario Geological Survey
Permanent Link to this Record:
MDI52N04SW00019
| Record Name(s) | Annco Mine - 1963, Martin-McNeely - 1983, No.2 Group - 1983, Annco Mine - Wilanour Resources - 1963 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Past Producing Mine Without Reserves or Resources |
| Date Created | 1983-Sep-14 |
| Date Last Modified | 2023-May-01 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Secondary Commodities: Silver
Township or Area: Dome
Latitude: 51° 4' 10.95" Longitude: -93° 48' 45.82"
UTM Zone: 15 Easting: 443057 Northing: 5657891 UTM Datum: NAD83
Resident Geologist District: Red Lake
NTS Grid: 52N04SW
Point Location Description: Centre of claim KRL 90 Map 2074
Location Method: Data Compilation
Access Description: The deposit was accessed by a drift from the 2050 foot level of the Cochenour Willans Mine.
1927-28: Martin McNeely Mines Ltd performed stripping, trenching, and drilling. 1934-35: Performed more stripping, trenching, and drilling. 1944-46: Carried out geological mapping, magnetometer survey, drilling - 10794.26 m of drilling completed on the Annco and adjoining Wilmar property by the end of 1946. 1958: Wilmar Mines incorporated, take over property owned by Martin McNeely and Cochenour Willans. 1963: Annco Mines incorporated to develop part of property, Cochenour Willans Mine drove their 627.25 m level into the Annco property. 1965: Production started. 1968: exploration for the downdip extension of the ore zone below the 2000 ft level established the mineralized zone to at least 175 ft below the 2000 ft level. 1971: Production ceased. 1972-1991: The operations had a number of owners, including Camflo Mines, Wilanour Resources, Esso Minerals Canada (Esso) and Inco Gold Inc. (Inco). The Annco mine was considered part of the Cochenour -Willans Mine site after this point. 1984: Compilation work by Esso Minerals determined that there was potential for a 459 590 tonne zone @ 25 g/t between the 3000 and 4600 level. Esso attempted to drill test the down plunge extension of the Annco orebody from surface with no success. 1985: Esso Minerals rehab the Cochenour shaft and drove a drift, 2050 level, into the Annco workings and setup two drill stations. Ten holes plus three wedge holes totaling 7226 m were completed. Drill results results imdicated that the strike length of mineralization was in the order of 137 m and that it could contain somewhere in the vicinity of 200,000 tons of mineable ore. The costs and high risk factor involved in attempting to prove this potential tonnage by additional drilling from 2050 level was not considered justified given the relatively small size of the typical West Zone stope. 1988-1990: Inco Gold completed 12 210 m of surface drilling, 450 m of drifting and 31 123 m of underground drilling. 1997: Goldcorp Inc. purchased a 100% interest in Cochenour–Willans Mine. 1998-2002: Goldcorp completed trenching, grab sampling and compilation work. 2003: Goldcorp allowed the mine, including the Annco, to flood.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 63.3809 | 52N04SW0057 | 52N04SW0057 |
| 63.4637 | 52N04SW0001 | 52N04SW0001 |
| 63.4009 | 52N04SW0002 | 52N04SW0002 |
| 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 Flows | Adjacent |
|---|---|---|---|---|
| Peridotite | 2 | Peridotite | Intrudes | |
| Ultramafic Schist | 4 | Talc | Adjacent |
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 | Pyrite | Economic | Ore | ||||
| 2 | Pyrrhotite | Economic | Ore | ||||
| 3 | Arsenopyrite | Economic | Ore | ||||
| 4 | Chalcopyrite | Economic | Ore | ||||
| 5 | Mariposite | Economic | Ore | ||||
| 6 | Gold | Economic | Ore | ||||
| 1 | Quartz | 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 Annco deposit is a down-plunge extension of the Cochenour Willans West Zone. The West Zone has been described as containing silicified granular structures at the hanging wall and footwall of the talc schist portion of the over-thrust Fault Zone. Mottled rhyolite dykes are often found between these structures and the hanging wall and footwall flows. Mineralization commonly persists through the dykes and into the flows. The property was developed from the 627.25 m level of the Cochenour Willans Mines.
Dec 07, 2005 (K R Kettles) - All of the volcanic rocks have been highly carbonatized, silicified, and sericitized.
| Zone | Year | Category | Tonnes | Reference | Comments | Commodities |
|---|---|---|---|---|---|---|
| Annco Mine Deposit | 1985 | Unclassified | 45360 | Original MDI | Resource is quotes as 50 000 tons at "Excellent grade". 1985: potential for 200,000 t, DDH assays average 0.2 opt Au/3 ft | Gold 5.67 g/t |
| Year | Tonnes | Commodities | Reference | Comment |
|---|---|---|---|---|
| 1971 | 134391 |
Gold 53903 Ounces |
OFR 5558 P. 433 | Total production of mine from 1965 to 1971 |
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:
Book - Northern Miner 74-01-31 p. 2
Publication Number: NMINER Date: 1974
Author:
Publisher Name: Northern Miner
Location: Red Lake RGP
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: 182-185 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: 48 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: 205-206 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: 432-433 Date: 1987
Author: Durocher M.E., Burchell P.S., Andrews A.J.
Publisher Name: Ontario Geological Survey
Location:
Book - 1964, COMPANY REPORT, P. 54 ( ANNCO?)
Publication Number: CO.RP 1964 Date: 1964
Author: Fahlgren, J.E.J.
Publisher Name:
Location: Red Lake RGP
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 - Dome Township, Kenora District
Publication Number: M2074 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:
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:
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