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Ontario Geological Survey
Permanent Link to this Record:
MDI52A11SW00007
| Record Name(s) | Thunderhead Gold Mine - 1950 |
|---|---|
| Related Record Type | Partial |
| Related Record(s) | |
| Record Status | Prospect |
| Date Created | 1979-Jul-23 |
| Date Last Modified | 2022-May-11 |
| Created By | |
| Revised By |
Primary Commodities: Gold, Platinum Metals, Copper
Secondary Commodities: Iron, Nickel, Silver, Zinc
Township or Area: Gorham
Latitude: 48° 32' 15.51" Longitude: -89° 17' 29.18"
UTM Zone: 16 Easting: 330858 Northing: 5378595 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 52A11SW
Point Location Description: Precise
Location Method: Field Visit with GPS
Access Description: Proceed along Hazelwood Road 18 km north of Highway 102 (Red River Road) to Peterson Road. Adit is 10 m from road on west side.
1945-46: Macassa Gold Mines Ltd. drilled 12 DDH totalling 575 m. 1950: Thunderhead Gold Mines Ltd. conducted line cutting and a magnetometer survey. 1961-62: Thunderhead drilled 5 DDH totalling 632 m and drove an adit 80 m. 2005: Kennecott drilled 3 DDH totalling 902 m. 2007: Geoinformatics Exploration Canada Ltd. drilled 4 DDH totalling 1904 m.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 63.231 | 52A11SW0016 | 52A11SW0016 |
| 2.34638 | 20000002091 | 20000002091 |
Province: Superior
Subprovince: Wawa
Terrane: Wawa-Abitibi
Belt: Shebandowan
Geological Age: Archean
| Rock Type | Rank | Composition | Texture | Relationship | Mafic lava flow-unsubdivided | 1 |
|---|---|---|---|---|
| Felsic lava flow-unsubdivided | 2 | |||
| Gabbro | 3 | |||
| Vein | 4 | Host |
Dec 16, 2015 (Therese Pettigrew) - The layered gabbro intrusion is approximately 1 km x 1 km and is interpreted to be 350 m deep. All of the 2007 drill holes were collared in a leucogabbro to melanogabbro phase. It consists of 40-70% plagioclase (medium-coarse grained with reddish oxidized surface) and 25-60% fine grained mafics (mainly clinopyroxene). The gabbro is underlain by a fine grained black-green peridotite (80% mafics and 20% plagioclase) sometimes with cumulate texture. Altered serpentine (chrysotite and lizardite) + chlorite-epidote zones are often present along fractures and can be pervasive (AFRI 20000002091).
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Chalcopyrite | Economic | Ore | ||||
| 2 | Gold | Economic | Ore | ||||
| 3 | Pyrite | Economic | Ore | ||||
| 4 | Pyrrhotite | Economic | Ore | ||||
| 5 | Sphalerite | Economic | Ore | ||||
| 6 | Magnetite | Economic | Ore | ||||
| 1 | Plagioclase | Economic | Gangue | ||||
| 2 | Clinopyroxene | Economic | Gangue |
Dec 16, 2015 (Therese Pettigrew) - Ferguson et al. (1971) reports that the No. 1 vein is 157 m long and strikes east. A sample assayed 1.70 oz/t Au and 1.28 oz/t Ag. Southwest of the auriferous stringers, copper and nickel sulphides occur associated with mafic intrusives. The first hole of the 2005 Kennecott program was drilled into a garnet-magnetite skarn. Four metres of 1.7 gpt gold and 0.53% copper at 58 metres (down-hole depth) were intersected. The second and third holes were on the layered gabbro-melanocratic gabbro-peridotite intrusion. Hole 3 intersected 11.8 metres of 0.295 ppm platinum, 0.373 ppm palladium, 0.32% copper, 0.10% nickel and 0.04 ppm gold from 288.6 metres down-hole including 5.5 metres of 0.428 ppm platinum, 0.541 ppm palladium, 0.48% copper and 0.14% nickel from 292.8 metres down-hole. The 2007 drill program results included the following: 14 metres of 0.35 % copper, 0.33 gpt platinum and 0.40 gpt palladium; 20 metres of 0.22 % copper, 0.25 gpt platinum 0.29 gpt palladium; 8 metres of 0.23 % copper, 0.21 gpt platinum 0.34 gpt palladium; and 4 metres of 0.78 % copper, 0.25 gpt platinum 0.29 gpt palladium (AFRI 20000002091). The Thunderhead property hosts the western extension of the gold bearing quartz veins on the Gorham property (MDI52A11SE00006). Surface sampling of the No. 1 vein indicated a grade of 0.63 opt Au across 2.5 feet for a length of 195 feet. The No. 3 vein, possibly the western extension of the Gorham #1 vein, yielded a grade of 0.714 opt Au across 1.8 feet for a length of 250 feet. In 1961-64, a 263 foot adit was driven on strike of the #1 vein, but ended short of the better mineralization part of the vein (AFRI 52A11SW0004).
| Rank | Classification |
|---|---|
| 1 | Lode (Gold) |
| 2 | Magmatic |
| 1 | Vein |
| Rank | Characteristic |
|---|---|
| 2 | Massive |
| 1 | Vein |
Book - Canadian Mines Handbook 1977-78, Thunderhead
Publication Number: CMH1977-78 Page: 304 Date: 1978
Author:
Publisher Name:
Location:
Mono - Gold deposits of Ontario, part 1, districts of Algoma, Cochrane, Kenora, Rainy River, and Thunder Bay
Publication Number: MDC013 Page: 274 Date: 1971
Author: Ferguson S.A., Groen H.A., Haynes R.
Publisher Name: Ontario Dept. of Mines and Northern Affairs
Location:
Map - Gorham Township and vicinity, District of Thunder Bay, Ontario
Publication Number: ARM48C Scale: 1:63,360 Date: 1997
Author: Macdonald R.D.
Publisher Name: Ontario Dept. of Mines
Location:
Map - Geological compilation series, Lakehead-Shebandowan sheet, District of Thunder Bay
Publication Number: P0177 Scale: 1:126,720 Date: 1997
Author: Pye E.G., Fenwick K.G.
Publisher Name: Ontario Dept. of Mines
Location:
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For detailed information regarding this mineral record please contact the Thunder Bay South Resident Geologist District Office