Ontario Geological Survey
Permanent Link to this Record:
MDI52G14NE00002
| Record Name(s) | Mountain Island Bay - 1983 |
|---|---|
| Related Record Type | Simple |
| Record Status | Occurrence |
| Date Created | 1995-May-30 |
| Date Last Modified | 2021-Dec-13 |
| Created By | Q Unknown |
| Revised By | Therese Pettigrew |
Primary Commodities: Gold
Township or Area: Penassi Lake Area
Latitude: 49° 53' 57.03" Longitude: -91° 8' 35.9"
UTM Zone: 15 Easting: 633337.99 Northing: 5529073.36 UTM Datum: NAD83
Resident Geologist District: Kenora
NTS Grid: 52G14NE
Point Location Description: Pits and trenches on map in Assessment report 52G14NE0010
Location Method: Conversion from MDI
Access Description: The trenches are located 400 m east of Hwy 599 approximately 650 m north of the cottage access road on the southwest tip of Mountain Island Bay. Ontario Geological Map 2268 has a trench indicated at this location.
Possibly 1930s: unknown individuals conducted trenching. 1970: Chimo Gold Mines Ltd. conducted a magnetometer and EM survey 1983: Prolific Petroleum Ltd. conducted magnetics and VLF-EM surveys, and sampling. 2004: Unitronix Corp. carried out prospecting and sampling.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.29269 | 20000000260 | 20000000260 |
| 2.27993 | 52G15NW2004 | 52G15NW2004 |
| 52G14NE CK-0051 | 52G14NE0066 | 52G14NE0066 |
| 52G14NE-0035 | 52G14NE0010 | 52G14NE0010 |
Province: Superior
Subprovince: Wabigoon
Belt: Sturgeon Lake
Geological Age: Archean
Dec 07, 2005 (R Tuomi) - Two shallow trenches follow a 080 degrees trend of shearing which dips 84 degrees to the north. The two trenches, approximately 18m apart, are in sheared metabasalt cut by granodiorite dikes near a contact with massive, medium grained granodiorite. The dikes trend 034 degrees and dip 84 degrees to the northwest. The trenches, which average 1m in width and 2 to 5 m in length, contain narrow shears with pink calcite in a silicified zone. 2 to 3 percent pyrite is present near the trench margins.
| Rock Type | Rank | Composition | Texture | Relationship | Mafic lava flow-unsubdivided | 1 | Basalt | Host |
|---|---|---|---|---|
| Mafic lava flow-unsubdivided | 2 | Host | ||
| Granodiorite | 3 | Host | ||
| Granodiorite | 4 | Massive | Near | |
| Granodiorite | 5 | Dykes | Host |
Dec 07, 2005 (R Tuomi) - MINERALIZATION OCCURS IN: narrow shear zones in metabasalt HOST ROCK: mafic metavolcanics near contact with granodiorite. OTHER ASSOCIATED ROCK TYPES: 1) massive granodiorite 2) granodiorite dikes.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Gold | Economic | Ore | ||||
| 2 | Pyrite | Economic | Ore | ||||
| 1 | Quartz | Economic | Gangue | ||||
| Carbonate | Alteration | Carbonatization | 1 | Unknown | Disseminated |
Feb 12, 2020 (R Tuomi) - Earlier sampling of grab samples from trench #3 gave assays of 0.141, 0.227 and 0.337 ounce gold per ton from a quartz-carbonate breccia. The most recent sampling was of the two southerm trenches, #1 and #2. Trench #1 assayed less than 0.01ounce gold per tonne. Trench #2 assayed 0.05 ounce gold per tonne. Only two trenches of the three mentioned in the reference were sampled and assayed during a visit to the site in 1992.
Feb 12, 2020 (Therese Pettigrew) - Sample 354967 returned 3474 ppb Au from a fine-grained volcanic with quartz-carbonate veins containing blebby pyrite (Assessment report 20000000260). Sample 902565 returned 2796 ppb Au from an altered granitic dyke with 3-4% sulphides (Assessment report 52G15NW2004).
Map - Granite Bay, Sturgeon Lake, Kenora and Thunder Bay districts
Publication Number: M2268 Scale: 1:31,680 Date: 1974
Author: Trowell N.F.
Publisher Name: Ontario Division of Mines
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 Kenora Resident Geologist District Office