Ontario Geological Survey
Permanent Link to this Record:
MDI42C03SW00004
| Record Name(s) | Magnacon Mine - 1985, Macassa-Bishu - 1945, Bishu Prospect - 1946, Magnacon Mines and Oil Ltd. - 1940, Magnacon Main Zone - 1987, Magnacon No. 10 & No. 12 Showings - 1987, Curtis and Bandy Zones - 1987 |
|---|---|
| Related Record Type | Compound |
| Related Record(s) | |
| Record Status | Past Producing Mine With Reserves or Resources |
| Date Created | 1988-Jul-22 |
| Date Last Modified | 2023-Aug-03 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Township or Area: Mishibishu Lake Area
Latitude: 48° 6' 20.99" Longitude: -85° 25' 52.34"
UTM Zone: 16 Easting: 616783.89 Northing: 5329253.3 UTM Datum: NAD83
Resident Geologist District: Sault Ste. Marie
NTS Grid: 42C03SW
Point Location Description: Adit in hillside, shown on P.3184
Location Method: Field Visit
Access Description: Drive west along highway 17 from the junction of highway 17 and 101 for approximately 50 km to the Paint Lake Road (a gravel road heading south from highway 17). Drive south along the gravel road for approximately 55 km to the Eagle River Mill and Magnacon adit.
1937: Macassa Mines Limited - discovery, prospecting, trenching, stripping. 1945-54: Bishu Mines Ltd. - gains control of 18 claims covering the property, prospecting, stripping, trenching, 57 ddh (2632 m), 1407 m deep drilling. 1983: Westfield Minerals Ltd. - mapping, prospecting, geochemical surveys, geophysics, trenching, channel sampling. 1985: Flanagan-McAdam Resources Ltd amalgamated with Magnacon Mines and Oils Ltd. Muscocho Explorations Limited becomes operation of property by purchasing Westfield Minerals Ltd. 25% interest with Windarra Minerals Ltd. holding the remaining 25%. 1985: Muscocho Explorations Ltd. - 98 ddh (50 000 m), mapping. 1986-87: Muscocho Exploration Ltd. - 77 surface ddh (42,219 ft), 36 underground ddh (9344 ft), 3325 ft of ramping, crosscutting, ore drifting. 1988: Muscocho Exploration Ltd. - 88,786 ft surface and underground diamond drilling. Decision made to bring mine into production. 1989: Muscocho Exploration Ltd. - mine officially opened. 1989: Muscocho Exploraton Ltd. - mine closed due to financial problems. March 2000: River Gold Mines Ltd. acquired 75% interest in Magnacon property. 2003-04: River Gold Mines: de-watering of workings, underground drilling.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| WP Mishibishu Lake.2 | 42C03SW0083 | 42C03SW0083 |
| 42C03SW0033A1 | 42C03SW0092 | 42C03SW0092 |
| 2.13584 | 42C03SW0030 | 42C03SW0030 |
| 42C03SW0011 | 42C03SW0124 | 42C03SW0124 |
| WP Mishibishu Lake.8 | 42C03SW0088 | 42C03SW0088 |
Province: Superior
Subprovince: Wawa
Terrane: Wawa-Abitibi
Belt: Mishibishu Lake
Geological Age: Neoarchean Geochronological Age: 2700 MA Geochron. Age Ref.: GOO VOL1
Metamorphism Type: Regional
Metamorphism Grade: Greenschist
Dec 07, 2005 (A Wilson) - All of the mineralized zones occur in the most highly strained portion of the Mishibishu Deformation Zone. The tectonic-stratigrapy strikes at 115 and dips at 45 degrees north. The Magnacon mineralized zone has a chlorite dominated structural hanging wall and a sericite dominated structural footwall. The Mishibishu Deformation zone is the largest of the deformation zones in the belt, measuring approximately 40 km in length and several hundred metres up to 1.5 km in width. The zone is located north of the Mishibishu Lake Stock and lies along the lithological contact of mafic metavolcanic rocks to the north (hanging wall) with clastic metasediments to the south (footwall) The Western MDZ is that portion of the deformation zone west of Macassa Creek.
| Rock Type | Rank | Composition | Texture | Relationship | Mafic lava flow-unsubdivided | 1 | Hanging Wall |
|---|---|---|---|---|
| Terrigenous-Clastic-Unsubdivided | 2 | Footwall | ||
| Schist-Unsubdivided | 3 | Chlorite-Calcite-Sericite | Host | |
| Quartz-Feldspar Porphyry | 4 | Quartz-Feldspar | Near |
Dec 07, 2005 (A Wilson) - All primary rock textures have been destroyed by intense alteration and deformation. The mafic metavolcanic rocks now consist of chlorite-calcite schists, which grade into chlorite-ankerite and sericite schists toward the mineralized zones. The metasedimentary rocks are now variable quartz-sericite-chlorite-ankerite-calcite schists, which are more sericitic in proximity to the mineralized zones. Some of the porphyry dikes are cut by the mineralization, but none are known to cut the mineralization. The feldspar porphyry dikes are texturally similar to the feldspar porphyry dikes associated with the Mishibishu Lake Stock.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Gold | Economic | Ore | ||||
| 1 | Arsenopyrite | Economic | Gangue | ||||
| 2 | Pyrite | Economic | Gangue | ||||
| 3 | Galena | Economic | Gangue | ||||
| 4 | Chalcopyrite | Economic | Gangue | ||||
| 5 | Tourmaline | Economic | Gangue | ||||
| Chlorite | Alteration | Chloritic | 1 | Strong | Replacement | ||
| Ankerite | Alteration | Carbonatization | 2 | Strong | Replacement | ||
| Sericite | Alteration | Chloritic | 3 | Strong | Replacement |
Dec 07, 2005 (A Wilson) - Mineralization occurs in quartz and ankerite veis which form zones from several centimetres up to several metres in width. The large veins show evidence of crack-seal textures. Gold-sulphide mineralization occurs in fractures with clots of sericite-ankerite-green mica wall rock within the quartz veins. The main mineralized zone appears to cut obliquely across the general foliation trend within the MDZ. A 10-30 cm wide massive sulphide band termed the Upper Sulphide Zone is usually present in the structural hanging wall approximately 60 cm above the auriferous zone. This massive pyrite-pyrrhotite-chalcopyrite-galena band can be traced discontinuously on surface for approximately 2.3 km from the Magnacon occurrences eastward to the Northwest occurrence. Results of 2004 U/G drilling of Main Zone include assays up to 13.65 g/t Au over 2.1 m.
Dec 07, 2005 (A Wilson) - The central core of the MDZ is characterized by intense hydrothermal alteration which in conjunction with the deformation serves to obliterate much of the primary rock textures. The inner 250 m of the MDZ contains schists made up to variable amounts and combinations of chlorite, sericite, ankerite, quartz, calcite, green mica, feldspar and pyrite.
| Shape | Length | Thickness | Depth | Strike | Dip | Plunge | Trend | Age | Reference |
|---|---|---|---|---|---|---|---|---|---|
| Tabular | 240 | 300 | 75 |
| Zone | Year | Category | Tonnes | Reference | Comments | Commodities |
|---|---|---|---|---|---|---|
| Magnacon Mine | 1990 | Unclassified | 1333562 | MP152 ROA 1990, p. 182 | 1,470,000 tons at 0.2 opt Au | Gold 0.2 oz/T |
| Magnacon Mine | 1988 | Unclassified | 1540000 | Muscocho 1988 Annual Report | Gold 6.9 g/t | |
| Magnacon Mine | 1987 | Possible | 777000 | Assessment File WP Mishibishu Lake.16 | Gold 5.5 g/t |
| Year | Tonnes | Commodities | Reference | Comment |
|---|---|---|---|---|
| 1989 | 265000 |
Gold 1165690 |
RIVER GOLD MINES 2001 ANNUAL REPORT |
File - Resident Geologist files Resident Geologist files WP Mishibishu Lake.16, WP Mishibishu Lake.17
Publication Number: Date:
Author:
Publisher Name:
Location: SSM RGP office
Map - Precambrian geology, Mishibishu Lake area, Mishibishu Lake sheet
Publication Number: P3152 Scale: 1:15,840 Date: 1992
Author: Reid R.G., Bowen R.P., Heather K.B., Logothetis J., Reilly B.A.
Publisher Name: Ontario Geological Survey
Location:
Map - University River, Algoma and Thunder Bay districts
Publication Number: M2333 Scale: 1:63,360 Date: 1976
Author: Bennett G., Thurston P.C., Giguere J.F.
Publisher Name: Ontario Division of Mines
Location:
Map - Operation Pukaskwa, districts of Algoma and Thunder Bay
Publication Number: P0541 Scale: 1:126,720 Date: 1997
Author: Bennett G., Thurston P.C., Giguere J.F.
Publisher Name: Ontario Dept. of Mines
Location:
Map - Operation Pukaskwa, University River sheet, districts of Thunder Bay and Algoma
Publication Number: P0507 Scale: 1:63,360 Date: 1997
Author: Bennett G., Thurston P.C., Giguere J.F.
Publisher Name: Ontario Dept. of Mines
Location:
Map - Geological series, Precambrian geology, Mishibishu Lake area, northeastern section, districts of Thunder Bay and Algoma
Publication Number: P2970 Scale: 1:15,840 Date: 1986
Author: Bowen R.P., Logothetis J., Heather K.B.
Publisher Name: Ontario Geological Survey
Location:
Map - Mishibishu Lake area, District of Thunder Bay, Ontario
Publication Number: ARM49J Scale: 1:63,360 Date: 1997
Author: Evans E.L.
Publisher Name: Ontario Dept. of Mines
Location:
Map - Marginal notes, Mishibishu Lake area
Publication Number: P3184 Date: 1992
Author: Reid R.G., Bowen R.P., Heather K.B., Logothetis J., Reilly B.A.
Publisher Name: Ontario Geological Survey
Location:
Folio - Mishibishu Lake area, Sault Ste. Marie Mining Division, NTS No. 42C/03SW
Publication Number: GDIF597 Date: 1997
Author: Wawa RGO
Publisher Name: Ontario Geological Survey
Location:
File - Newspaper - Muscocho Explorations WRGO
Publication Number: Clippings Date: 1996
Author:
Publisher Name:
Location: Timmins RGP
Part - Geology of the Mishibishu Lake area
Publication Number: ARV49-09 Page: 12 Date: 1997
Author: Evans E.L.
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: 289 Date: 1971
Author: Ferguson S.A., Groen H.A., Haynes R.
Publisher Name: Ontario Dept. of Mines and Northern Affairs
Location:
MonoMap - Geology of the Pukaskwa River-University River area, districts of Algoma and Thunder Bay
Publication Number: R153 Page: 50-51 Date: 1977
Author: Bennett G., Thurston P.C.
Publisher Name: Ontario Division of Mines
Location:
Article - Mineralization of the Mishibishu Lake greenstone belt
Publication Number: MP132.059 Page: 284-288 Date: 1997
Author: Heather K.B.
Publisher Name: Ontario Geological Survey
Location:
Mono - Wawa mineral deposits data base
Publication Number: OFR5775 Page: 283-284, 290 Date: 1991
Author: Frey E.D., Stewart R.C.
Publisher Name: Ontario Geological Survey
Location:
Mono - Geology, structure and economic geology of the Mishibishu Lake area
Publication Number: OFR5774 Page: 145-146, 160-161, 19 Date: 1991
Author: Reid R.G., Bowen R.P., Reilly B.A., Logothetis J., Heather K.B.
Publisher Name: Ontario Geological Survey
Location:
Article - Wawa Resident Geologist's District - 1988
Publication Number: MP142.010 Page: 186-187 Date: 1997
Author: Tortosa D.J.J., Frey E.D., Stewart R.C., Wilson A.C., Wing W., Ashick L., Melisek J.
Publisher Name: Ontario Geological Survey
Location:
Article - Wawa Resident Geologist's District - 1989
Publication Number: MP147.010 Page: 187 Date: 1997
Author: Tortosa D.J.J., Frey E.D., Stewart R.C., Wilson A.C., Wing W., Beach P., Walmsley J.
Publisher Name: Ontario Geological Survey
Location:
Article - Wawa Resident Geologist's District - 1990
Publication Number: MP152.009 Page: 182-183 Date: 1997
Author: Tortosa D.J.J., Frey E.D., Delisle P.C., Lowe C., Wilson A.C., Beach P., Walmsley J.
Publisher Name: Ontario Geological Survey
Location:
File - Windarra Minerals Ltd./Westward Explorations Ltd.
Publication Number: clippings Date: 2004
Author:
Publisher Name:
Location: Timmins RGP
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