Ontario Geological Survey
Permanent Link to this Record:
MDI52G03SW00052
| Record Name(s) | Bufo Lake Occurrence - 2004 |
|---|---|
| Related Record Type | Simple |
| Record Status | Occurrence |
| Date Created | 2004-Feb-26 |
| Date Last Modified | 2022-Jan-05 |
| Created By | B Schnieders |
| Revised By | B Schnieders |
Primary Commodities: Gold
Township or Area: Norway Lake Area
Latitude: 49° 1' 55.36" Longitude: -91° 22' 11.86"
UTM Zone: 15 Easting: 619146.378 Northing: 5432297.932 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 52G03SW
Point Location Description: N/A
Location Method: Field Visit
Access Description: The Bufo Lake occurrence is located in the Lumby Lake greenstone belt of the Wabigoon Subprovince, located approximately 40 km northeast of Atikokan. Access is gained via the Premier Lake road at the 41 km marker.
Province: Superior
Subprovince: Wabigoon
Belt: Lumby Lake
Geological Age: Archean
Dec 07, 2005 (B Schnieders) - Bufo Lake Occurrence The Bufo Lake occurrence is located in the Lumby Lake greenstone belt of the Wabigoon Subprovince, located approximately 40 km northeast of Atikokan. Access is gained via the Premier Lake road at the 41 km marker. A gold occurrence was re-discovered by Ray Bernatchez while prospecting in 2003. The Bufo Lake occurrence (15U:5432080 Northing, 619158 Easting) consists of a quartz-carbonate vein striking 90 to 120 and dipping nearly vertically. The quartz-carbonate vein appears to be at the contact between a quartz-phyric, diorite or tonalite and highly deformed mafic metavolcanic rocks or gabbro (chlorite schist). The vein is exposed by stripping for 15 m. The quartz-carbonate vein varies in width from 15 to 90 cm and displays a crack-seal texture. The vein is hosted by a carbonatized schist, which includes green mica, iron carbonate, pyrite, minor chalcopyrite and possibly galena or a telluride. The carbonatized schist contains euhedral pyrite crystals and was interpreted to represent an altered and deformed porphyry or diorite. A chip sample across 30 cm of quartz vein collected by the authors assayed 9.03 g/t gold and 14 g/t silver. A chip sample across 30 cm of the altered porphyry (carbonate schist) assayed 1.69 g/t gold (Resident Geologist's Files, Thunder Bay South District, Thunder Bay). The Bufo Lake occurrence is located approximately 1 km west of the old Mining North Pit 5, where samples of quartz-carbonate vein in float returned up to 2.33 ounces per ton gold (Schnieders and Dutka 1985). The original float boulder was 30 to 50 cm across and consisted of rusty-weathering quartz and euhedral pyrite. A smoky quartz vein hosted by a metavolcanic schist with green mica returned 0.14 ounce per ton gold. A sample from the old pits immediately south of Bufo Lake (UTM: 15U5431817 Northing, 619633 Easting) collected by the authors assayed 121 ppb Au and 6032 ppm Cu (Resident Geologist's Files, Thunder Bay South District,
Map - Atikokan-Lakehead sheet, geological compilation series, Kenora, Rainy River and Thunder Bay districts
Publication Number: M2065 Scale: 1:253,440 Date: 1997
Author: Pye E.G., Fenwick K.G.
Publisher Name: Ontario Dept. of Mines
Part - Geology of the Lumby Lake area
Publication Number: ARV69-05 Scale: Date: 1997
Author: Woolverton R.S.
Publisher Name: Ontario Dept. of Mines
Map - Lumby Lake area, districts of Kenora and Rainy River, Ontario
Publication Number: M1960G Scale: 1:31,680 Date: 1997
Author: Woolverton R.S.
Publisher Name: Ontario Dept. of Mines
Map - Geological series, Precambrian geology, Lumby Lake area, western part, Kenora District
Publication Number: P2828 Scale: 1:15,840 Date: 1985
Author: Jackson M.C., Chevalier P.
Publisher Name: Ontario Geological Survey
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For detailed information regarding this mineral record please contact the Thunder Bay South Resident Geologist District Office