Ontario Geological Survey
Permanent Link to this Record:
MDI52F09SW00044
| Record Name(s) | Brockman - 1898 |
|---|---|
| Related Record Type | Partial |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1991-Jan-22 |
| Date Last Modified | 2022-Mar-16 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Secondary Commodities: Silver
Township or Area: Tabor Lake Area
Latitude: 49° 30' 38.6" Longitude: -92° 20' 1.15"
UTM Zone: 15 Easting: 548237.905 Northing: 5484446.336 UTM Datum: NAD83
Resident Geologist District: Kenora
NTS Grid: 52F09SW
Point Location Description: General
Location Method: Field Visit with GPS
Access Description: The Brockman Prospect is situated about 150 m northwest of Brown Lake on claim K. 590550 (formerly mining location H.W. 419). The shaft, trenches, and adit are accessible from a narrow bush road, which branches east from the Sandy Point Road, 9.5 km south of its intersection with Highway 17 at Borups Corners. An old footpath branching southwest from the bush road leads to the shaft.
1898 - 1900: The Northwestern Ontario Exploration Company sunk a 142 ft. shaft on a north-south-trending quartz vein, drove an adit 50 ft. along an east-west-trending quartz vein, and did some trenching on both veins. 1981: Staked by A. Kozowy. 1983 - 1984: Teck Explorations Ltd. optioned the claims, conducted ground geophysics, geological mapping, and sampled the dump at the shaft, the adit and trenches. 1985: Claims transferred back to A. Kozowy. 1987: Claims optioned to International Platinum Corporation who conducted stripping and sampling. The Brockman Prospect is underlain by fine-grained, dark green, chloritic and carbonatized, massive, mafic metavolcanic flows, in close proximity to a large gabbro intrusion to the southwest and felsic to intermediate pyroclastics to the north. The Brockman Prospect occurs within the dominantly calc-alkaline Kawashegamuk Lake Group. Mineralization: A 6.5 ft. x 9.8 ft. timbered shaft was sunk to a depth of 43.3 metres on a narrow shear zone occupied by a thin (15 cm-30 cm) milk white to dark blue-gray quartz vein. The vein strikes northwest, dips steeply west, and pinches and swells along its strike and dip. Bow (1899) reported that the vein was traced for a strike length of 305.0 metres. The vein contains iron carbonate and angular, chloritic fragments of mafic wall rock. The fragments and wall rock immediately next to the vein are intensely altered by iron carbonate. Variable amounts [<1-3%] of disseminated chalcopyrite, sphalerite, pyrrhotite and pyrite occur along the edges of the vein and within the vein. A small adit on the face of a hill, located approximately 240 m west-southwest of the Brockman shaft, has been driven 15.2 metres along a shear zone occupied by a narrow [< 50 cm] quartz vein, striking east-west, dipping 60° north. The milk white vein pinches and swells along its strike and dip and contains disseminated pyrite and small angular fragments of chloritic, mafic, wall rock. The surrounding mafic metavolcanics are iron carbonatized and contain disseminated pyrite. An assay of 1 ounce gold per ton was obtained from the quartz vein on surface, but poor gold assays were obtained from samples taken inside the adit (W. Penno, geologist. Teck Explorations Ltd., personal communication, 1984). Bow (1899) reported that the vein was traced along strike for 182.9 metres and was rich with gold at the adit entrance, but poor within the adit. Three grab samples of quartz vein material, taken by the author from the dump at the shaft, assayed 0.01, 0.08, and 0.52 ounce gold per ton. Sampling at the dump by Kresz (1987) gave assays of 0.05 ounce gold per ton, and 2.16, 2.92, and 12.66 ounces gold per ton, with silver assays ranging from 0.2 ounce silver per ton to 1.56 ounces silver per ton. (OFR 5723, p. 176, 177)
Province: Superior
Subprovince: Wabigoon
Terrane: Western Wabigoon
Belt: Eagle-Wabigoon-Manitou
Geological Age: Precambrian
| Rock Type | Rank | Composition | Texture | Relationship | Mafic lava flow-unsubdivided | 1 | Chloritic And Carbonatized | Contains |
|---|
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 5 | Chalcopyrite | Economic | Ore | ||||
| 10 | Gold | Economic | Ore | ||||
| 15 | Pyrite | Economic | Ore | ||||
| 20 | Pyrrhotite | Economic | Ore | ||||
| 25 | Sphalerite | Economic | Ore |
Mar 16, 2022 (Q Unknown) - Best assay 12.66 opt Au AND 1.56 opt Ag.
| Year | Tonnes | Commodities | Reference | Comment |
|---|---|---|---|---|
| 1991 | 0 | MDI |
Part - Mines of northwestern Ontario
Publication Number: ARV08-01.004 Scale: Date: 1998
Author: Bow J.A.
Publisher Name: Ontario Bureau of Mines
Location:
MonoMap - Geology of the Kawashegamuk Lake area, District of Kenora
Publication Number: OFR5659 Scale: Date: 1987
Author: Kresz D.U.
Publisher Name: Ontario Geological Survey
Location:
Mono - Geology, gold mineralization and property visits in the area investigated by the Dryden-Ignace economic geologist, 1984-1987
Publication Number: OFR5723 Scale: Date: 1989
Author: Parker J.R.
Publisher Name: Ontario Geological Survey
Location:
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