Ontario Geological Survey
Permanent Link to this Record:
MDI42C03SW00009
| Record Name(s) | Discovery Showing - 1981, Erie Canadian Occurrence - 1930 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1991-Jan-08 |
| Date Last Modified | 2022-Sep-13 |
| Created By | |
| Revised By |
Primary Commodities: Gold, Silver
Township or Area: Mishibishu Lake Area
Latitude: 48° 5' 29.55" Longitude: -85° 22' 15.47"
UTM Zone: 16 Easting: 621301.93 Northing: 5327758.31 UTM Datum: NAD83
Resident Geologist District: Sault Ste. Marie
NTS Grid: 42C03SW
Point Location Description: Trenching north of Mishi Lake
Location Method: Based on Assessment
Access Description: The site is most easily accessed by helicopter from Wawa.
1925-26: Pioneer Corporation - prospecting, sampling. 1937 - 38: Erie Canadian Mines Ltd. - property acquisition from L. A. Van Sickle et al., mapping, prospecting, trenching. 1981-85: Westfield Minerals Ltd. - mapping, geochemistry, ground geophysics, 25 ddh. 1994: MacMillan Gold Corp. and Granges Inc. - airborne geophysics.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| Mishibishu Lake 0017 | 42C03SW0116 | 42C03SW0116 |
| WP Mishibishu Lake.8 | 42C03SW0088 | 42C03SW0088 |
| WP Mishibishu Lake.42 | 42C03SE2001 | 42C03SE2001 |
| Mishibishu Lake 0025 | 42C03SW0108 | 42C03SW0108 |
| Mishibishu Lake 0023 | 42C03SW0109 | 42C03SW0109 |
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
Dec 07, 2005 (A Wilson) - The Mishibishu Deformation Zone (MDZ) is the largest of the deformation zones int he 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 and clastic metasediments to the south. The central MDZ has the highest degree of strain intensity and alteration within the belt. Shear zones are broad and exhibit pervasive deformation and alteration. Mafic metavolcanics in the hanging wall become progressively more strained and altered with increasing proximity to the centre of the zone. Conglomerate clasts are attenuated and only the most competent clasts are discernable from matrix. An intense penetrative foliation strikes approximately 300 and a well developed stretching lineation plunges moderately to the N and NE. The Discovery occurrences lies within a subsidiary shear zone located north of the main MDZ. The Discovery occurrence is bounded to the north and west by a major, NE-trending cross structure across which there is a significant change i n the degree of alteration and deformation of the rocks. NW of this structure, are weakly foliated, chlorite-calcite bearing mafic to intermediate metavolcanics as well as undeformed porphyritic feldspar-bearing flows.
| Rock Type | Rank | Composition | Texture | Relationship | Vein | 1 | Quartz | Host |
|---|---|---|---|---|
| Mafic Schist | 2 | Chlorite-Calcite Schist | Hanging Wall | |
| Schist-Unsubdivided | 3 | Chlorite-Calcite | Footwall |
Dec 07, 2005 (A Wilson) - The showing consists of a series of multiple quartz veins. In dril core, this mineralized vein system is hosted by a black, graphitic, sulphide-bearing schist. The occurrence si bounded to the N and W by a major, NE-trending cross-structure across which there is a significant change in the degree of alteration and deformation. NW of this structure are weakly foliated, chlorite-calcite bearing mafic to intermediate metavolcanic rocks as well as undeformed porphyrytic feldspar-bearing flows. To the east and south, the occurrence is bounded by an NE trending diabase dike swarm. The rocks to the south of the occurrence are chlorite-calcite schists that closely resemble the mafic metavolcanic rocks to the north.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Gold | Economic | Ore | ||||
| 1 | Pyrite | Economic | Gangue | ||||
| 2 | Arsenopyrite | Economic | Gangue | ||||
| 3 | Galena | Economic | Gangue | ||||
| 4 | Sphalerite | Economic | Gangue | ||||
| 5 | Chalcopyrite | Economic | Gangue |
Dec 07, 2005 (A Wilson) - A sample collected by Erie Canadian in 1938 returned an assay of 2.97 oz/t Au over 8 inches. Grab samples collected by Westifeld in 1982 returned assays of 1.32 oz/t Au and 1.40 oz/t Ag; tr Au and 0.02 oz/t Ag.
| Rank | Characteristic |
|---|---|
| 1 | Sheared |
| 2 | Vein |
| Shape | Length | Thickness | Depth | Strike | Dip | Plunge | Trend | Age | Reference |
|---|---|---|---|---|---|---|---|---|---|
| Regular | 120 | 4 | 132 |
Date: Oct 17, 2001
Geologist: A Wilson
Notes: There is a broad halo surrounding the occurrence in which there is an increase in alteration intensity as the mineralized zone is approached. These alteration zones are listed in order of increasing proximity to mineralization. A) chlorite-calcite-pyrite. B) chlorite-ankerite-calcite-pyrite-quartz. C) chlorite-sericite-ankerite-calcite-pyrite-quartz. Within the most extreme alteration, compositional mineral banding is common, especially adjacent to the mineralization. All alteration types are gradational to one another. Alteration type C forms a 15 m wide envelope around the mineralization, and alteration type B forms an outer envelope of 90 m. The vein system varies from a single discrete quartz vein to swarms of foliation-parallel and crosscutting veins. At least 3 sets of quartz veins have been observed on surface: an early set of foliation-parallel veins which are commonly boudinaged and strongly deformed; a major set, which clearly cross cuts the foliation and commonly occupies axial traces of kink bands; and late quartz-tourmaline veinlets.
File - Resident Geologist files Mishibishu Lake 0024-A1, St. Germain-0012
Publication Number: Date:
Author:
Publisher Name:
Location: SSM RGP office
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:
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:
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:
Article - Gold showings of the Mishibishu Lake area, Thunder Bay District
Publication Number: MP126.015S Page: 86-87 Date: 1997
Author: Heather K.B.
Publisher Name: Ontario Geological Survey
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:
Article - Mineralization of the Mishibishu Lake greenstone belt
Publication Number: MP132.059 Page: 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 - 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 - 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:
Mono - Wawa mineral deposits data base
Publication Number: OFR5775 Page: 285 Date: 1991
Author: Frey E.D., Stewart R.C.
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:
Mono - Geology, structure and economic geology of the Mishibishu Lake area
Publication Number: OFR5774 Page: 224-241 Date: 1991
Author: Reid R.G., Bowen R.P., Reilly B.A., Logothetis J., Heather K.B.
Publisher Name: Ontario Geological Survey
Location:
MonoMap - Geology of the Pukaskwa River-University River area, districts of Algoma and Thunder Bay
Publication Number: R153 Page: 47-48 Date: 1977
Author: Bennett G., Thurston P.C.
Publisher Name: Ontario Division of Mines
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