Ontario Geological Survey
Permanent Link to this Record:
MDI42C03SW00010
| Record Name(s) | Mishi Pit - 2002, Mishi Deposit - 1988, Granges-MacMillan Prospect - 1988, Mishi Main Zone - 1988, Mishi #2 Zone - 1996 |
|---|---|
| Related Record Type | Compound |
| Related Record(s) | |
| Record Status | Past Producing Mine Without Reserves or Resources |
| Date Created | 1991-Jan-08 |
| Date Last Modified | 2023-May-04 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Township or Area: Mishibishu Lake Area
Latitude: 48° 6' 56.85" Longitude: -85° 26' 59.93"
UTM Zone: 16 Easting: 615364 Northing: 5330332 UTM Datum: NAD83
Resident Geologist District: Sault Ste. Marie
NTS Grid: 42C03SW
Point Location Description: Open pit
Location Method: Data Compilation
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 50 km to where a west-trending bush road intersects the main road. Drive west approximately 1 km to a large stripped area.
1985-86: MacMillan Energy Corp Ltd. - geochemistry, ground geophysics, 29 ddh (7072.8 ft). 1987-95: MacMillan Gold Corp. and Granges Exploration Ltd. - 249 ddh (138,461.41 ft), ground geophysics, trenching, stripping, bulk sampling (6000 tonnes), airborne geophysics. 1996-97: MacMillan Gold Corp. - 50% interest in property sold to Mishibishu Gold Corp., environmental baseline survey, structural assessment. 1998-2001: River Gold Mines Ltd. - property acquisition, infill drilling, DD-73-1578 m. 2002-2007: River Gold Mines Ltd. - production. 2006: Wesdome Gold Mines Inc. - DD-18-3232 m., mineral inventory. begins in mid-year; company plans to drift 1 km from Magnacon. 2010-2011: Wesdome Gold Mines Inc. - feasibility study, DD-21,000m, dewatering, construction. 2012: Wesdome Gold Mines Inc. - commencement of commercial production. 2021: Production from the pit stopped, but stockpiled ore was still being processed at the Eagle River Mine.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| WP Mishibishu Lake.7 | 42C03SW0082 | 42C03SW0082 |
| Mishibishu Lake 0032-B1 | 42C03SW0093 | 42C03SW0093 |
| WP Mishibishu Lake.49 | 42C03SW0025 | 42C03SW0025 |
| WP Mishibishu Lake.43 | 42C03SW0021 | 42C03SW0021 |
| WP Mishibishu Lake.45 | 42C03SW0009 | 42C03SW0009 |
| WP Mishibishu Lake.50 | 42C03SW0045 | 42C03SW0045 |
| WP Mishibishu Lake.42 | 42C03SE2001 | 42C03SE2001 |
| WP Mishibishu Lake.44 | 42C03NW0005 | 42C03NW0005 |
Province: Superior
Subprovince: Wawa
Terrane: Wawa-Abitibi
Belt: Michipicoten
Tectonic Assemblage: Catfish
Geological Age: Neoarchean Geochronological Age: 2.7 GA Geochron. Age Ref.: GOO VOL 1
Feb 03, 2011 (A Wilson) - All of the mineralized zones occur in the most highly strained portion of the Mishibishu Deformation Zone. The tectonic-stratigraphy 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. The deformation and alteration styles of the western MDZ are similar to the central MDZ, however, the intensity of strain and alteration decreases further to the west as the Pukaskwa Batholith is approached.
| Rock Type | Rank | Composition | Texture | Relationship | Schist-Unsubdivided | 1 | Chlorite-Calcite | Host |
|---|---|---|---|---|
| Mafic lava flow-unsubdivided | 2 | Sheared | Hanging Wall | |
| Quartz-Feldspar Porphyry | 3 | Quartz Porphyritic | Near | |
| Conglomerate | 4 | Calcite-Sericite | Sheared | Footwall |
Feb 03, 2011 (A Wilson) - Gold mineralization is hosted by a strongly sheared package of mafic metavolcanic rocks, quartz-eye bearing rocks of unknown origin, and clastic metasedimentary rocks. The metavolcanic rocks consist of massive, medium-to coarse-grained amphibole+plagioclase bearing flows and sills which are variably sheared to chlorite/calcite schists. The metasedimentary rocks were originally polymictic conglomerates and wackes but have been sheared to calcite+sericite+iron carbonate schists.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Ankerite | Economic | Gangue | ||||
| 2 | Arsenopyrite | Economic | Gangue | ||||
| 3 | Tourmaline | Economic | Gangue | ||||
| 4 | Pyrite | Economic | Gangue |
Feb 03, 2011 (A Wilson) - Assays from diamond drilling completed by Granges in 1987 returned values up to 73.54 g/t Au over 1 m. Trench assays returned assays of: 2.43 g/t Au over 7 m; 9.84 g/t Au over 5 m; 2.98 g/t Au over 20m; 4.34 g/t Au over 12m; 5 g/t Au over 14 m; 8.56 g/t Au over 10 m; 5.81 g/t Au over 8 m; 4.26 g/t Au over 10 m; 6.20 g/t Au over 13 m and 3.87 g/t Au over 6 m.
| Rank | Characteristic |
|---|---|
| 1 | Sheared |
| Shape | Length | Thickness | Depth | Strike | Dip | Plunge | Trend | Age | Reference |
|---|---|---|---|---|---|---|---|---|---|
| Irregular | 400 |
Date: Oct 19, 2001
Geologist: A Wilson
Notes: The Main Zone consists of 5 ore lenses arranged in a stacked, en echelon series of plunging quartz vein aggregates. Lenses are defined based on maximum abundance of quartz vein material, coincident gold values and characteristic stratigraphic position. Grade continuity is better in mafic-hosted ore zones where the gold is hosted by pyrite disseminations within the veins, as well as, the wall rocks. Gold distribution is more discontinuous in felsic-hosted ore zones where the gold is distributed almost entirely as free gold within quartz veins. Gold mineralization is associated with zones of smokey quartz veins that are spatially associated with zones of sericitization.
| Zone | Year | Category | Tonnes | Reference | Comments | Commodities |
|---|---|---|---|---|---|---|
| Mishi Pit - Open Pit | 2021 | Inferred Mineral Resource | 2300000 | Wesdome NI 43-101 p. 115, SEDAR, April 22, 2022 | 120000 ounces Au | Gold 1.61 g/t |
| Mishi - Underground | 2020 | Inferred Mineral Resource | 400000 | Wesdome NI 43-101 p. 115, SEDAR, April 22, 2022 | 65000 ounces Au | Gold 5.4 g/t |
| Mishi - Open Pit | 2020 | Inferred Mineral Resource | 2800000 | Wesdome NI 43-101 p. 115, SEDAR, April 22, 2022 | 147000 ounces Au | Gold 1.6 g/t |
| Mishi Mine | 2019 | Proven + Probable Reserve | 116000 | OFR6366, p.6 | 10,500 contained ounces Au; Proven + Probable Mineral Reserves | Gold 2.8 g/t |
| Mishi - Underground | 2019 | Inferred Mineral Resource | 373000 | OFR6366, p.6 | 65,000 contained ounces Au | Gold 5.4 g/t |
| Mishi - Open Pit | 2019 | Inferred Mineral Resource | 2808000 | OFR6366, p.6 | 147,000 contained ounces Au | Gold 1.6 g/t |
| Mishi - Underground | 2010 | Indicated Mineral Resource | 567100 | River Gold Mines press release 29/11/10 | 82359 ounces | Gold 4.52 g/t |
| Mishi - Underground | 2010 | Inferred Mineral Resource | 437600 | River Gold Mines press release 29/11/10 | 81369 ounces | Gold 5.78 g/t |
| Mishi - Open Pit | 2010 | Indicated Mineral Resource | 44888200 | River Gold Mines press release 29/11/10 | 333940 ounces | Gold 2.12 g/t |
| Mishi - Open Pit | 2010 | Measured Mineral Resource | 280900 | River Gold Mines press release 29/11/10 | 22,192 ounces | Gold 2.46 g/t |
| Mishi Pit - Open Pit | 2010 | Inferred Mineral Resource | 5169200 | River Gold Mines press release 29/11/10 | 59362 ounces | Gold 2.42 g/t |
| Mishi Pit | 2002 | Proven + Probable Reserve | 210700 | River Gold Mines 4th quarter results | Gold 3.1 g/t | |
| Mishi Deposit | 2001 | Unclassified | 859000 | River Gold Mines 2001 Annual Report | ||
| Mishi Deposit | 2001 | Probable Mineral Reserve | 104000 | River Gold Mines 2001 Annual Report | Gold 3.75 g/t | |
| Mishi Deposit | 2001 | Possible | 298000 | River Gold Mines 2001 Annual Report | ||
| Mishi Deposit | 1997 | Possible | 1424000 | Mishibishu Gold Corporation 1997 Annual Report | Gold 4.26 g/t | |
| Mishi Main Zone | 1996 | Unclassified | 772000 | MacMillan Gold Corp. 1996 Annual Report | ||
| Mishi Deposit | 1988 | Proven | 1108391 | WP Mishibishu Lake.25 p. 3 | Gold 5.7 g/t | |
| Mishi Open Pit | 1988 | Proven | 772000 | Resident Geologist Files |
| Year | Tonnes | Commodities | Reference | Comment |
|---|---|---|---|---|
| 2021 | 36508 |
Gold 2283 Ounces |
OFR6384, p.2 | 2,283 ounces at a head grade of 2.4 g/t Au |
| 2020 | 39856 |
Gold 2718 Ounces |
OFR6374, p.2 | 2,718 oz Au at a head grade of 2.7 g/t Au |
| 2019 | 46405 |
Gold 3072 Ounces |
OFR6366, p.6 | 3,072 oz Au at a head grade of 2.5 g/t Au |
| 2018 | 70633 |
Gold 4310 Ounces |
Wesdome Gold Mines Ltd. press release February 21, 2019 | 4,310 ounces at a head grade of 2.3 g/t gold |
| 2017 | 152591 |
Gold 7985 Ounces |
Wesdome Gold Mines Ltd. press release January 11, 2018 | 7,985 ounces at a head grade of 2.0 g/t gold |
| 2016 | 30714 |
Gold 1292 Ounces |
Wesdome Gold Mines Ltd. press release February 22, 2017 | 1,292 ounces at a head grade of 1.6 g/t gold |
| 2015 | 138688 |
Gold 7485 Ounces |
Wesdome Gold Mines Ltd. press release February 22, 2017 | 7,485 ounces at a head grade of 2.0 g/t gold |
| 2007 | 134204 |
Gold 12076 Ounces |
Brousseau et al. p. 31 | total production 2002-2007 134,204 tonnes @ 3.4 g/t Au (12,076 ounces) |
Book - Granges Exploration Ltd. newspaper clippings
Publication Number: Clippings Date: 1996
Author:
Publisher Name:
Location: Timmins RGP
File - Resident Geologist files WP Mishibishu Lake.40, WP Mishibishu Lake.25, Mishibishu Lake 0028
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:
Publication - Technical Report for the Eagle River Gold Mining Complex, Ontario, Canada
Publication Number: NI 43-101 Page: 115 Date: 2022
Author: Taylor, S., So, J., Moffatt, B.
Publisher Name: Wesdome Gold Mines Ltd
Location: SEDAR
Article - Mineralization of the Mishibishu Lake greenstone belt
Publication Number: MP132.059 Page: 287-288 Date: 1997
Author: Heather K.B.
Publisher Name: Ontario Geological Survey
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 - 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:
Mono - Wawa mineral deposits data base
Publication Number: OFR5775 Page: 287 Date: 1991
Author: Frey E.D., Stewart R.C.
Publisher Name: Ontario Geological Survey
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:
Mono - Geology, structure and economic geology of the Mishibishu Lake area
Publication Number: OFR5774 Page: 187-191 Date: 1991
Author: Reid R.G., Bowen R.P., Reilly B.A., Logothetis J., Heather K.B.
Publisher Name: Ontario Geological Survey
Location:
Book - The structure, stratigraphy and mineral deposits of the Wawa area: Geological Association of Canada–Mineralogical Association of Canada–Society of Economic Geologists, Joint Annual Meeting, Toronto 1991, Field Trip A6
Publication Number: GACMAC Page: 57-58 Date: 1991
Author: Sage, R.P. and Heather, K.B.
Publisher Name: Geological Association of Canada
Location: Timmins RGP
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 - 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:
Mono - Report of Activities 2020, Resident Geologist Program, Timmins Regional Resident Geologist Report: Timmins and Sault Ste. Marie Districts
Publication Number: OFR6374 Date: 2021
Author: Azadbakht Z., Bousquet P., Zammit K., Daniels C.M., Hinz S.L.K., Sword P., Boucher C., Dorland G., Patterson C.
Publisher Name: Ontario Geological Survey
Location:
Publication - Technical report and pre-feasibility study for the Mishi Project, 150 p.
Publication Number: NI 43-101 Date: 2011
Author: K. Brousseau, N. Gauthier, S. Poirier
Publisher Name:
Location: Timmins RGO
Mono - Report of Activities 2019, Resident Geologist Program, Timmins Regional Resident Geologist Report: Timmins and Sault Ste. Marie Districts
Publication Number: OFR6366 Date: 2020
Author: van Hees E., Bousquet P., Suma-Momoh J., Daniels C.M., Hinz S.L.K., Boucher C., Sword P., Wang L., Fudge S.P., Millette A., Patterson C.
Publisher Name: Ontario Geological Survey
Location:
We are continuously updating our assessment file / technical report information. If you notice errors in the data, please contact us.
Please review our Terms of Use agreement for this data product.
For detailed information regarding this mineral record please contact the Sault Ste. Marie Resident Geologist District Office