Ontario Geological Survey
Permanent Link to this Record:
MDI52E10SW00016
| Record Name(s) | Sentinel - 1898 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1980-Jun-30 |
| Date Last Modified | 2023-Jul-04 |
| Created By | |
| Revised By |
Primary Commodities: Gold, Antimony
Township or Area: Shoal Lake Area
Latitude: 49° 35' 33.29" Longitude: -94° 47' 11.69"
UTM Zone: 15 Easting: 370885.62 Northing: 5494866.48 UTM Datum: NAD83
Resident Geologist District: Kenora
NTS Grid: 52E10SW
Point Location Description: Precise
Location Method: Conversion from MDI
Access Description: The occurrence is about 28 km southwest of Kenora, 2.7 km south of Upper Ash Rapids, and is accessible by boat from Kenora or Clearwater Bay.
Circa 1887: Owned by Coronada Gold Mining Company Ltd. Work was begun on shafts but operations were suspended. 1898: property optioned to Sentinel Consolidated Gold Mining Company of Ontario. Work recommenced and 60 tons of vein material were test milled at the Rat Portage Reduction Works. 1975: Hudson Bay Exploration and Development Company Ltd. drilled 1 DDH totalling 127.1 m 500 m to the west, at the edge of Labyrinth Bay. 1988: Homestake Mineral Development Company carried out mapping and sampling.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 27 | 52E10SW8524 | 52E10SW8524 |
| 2.11976 | 52E10SW8577 | 52E10SW8577 |
Province: Superior
Subprovince: Wabigoon
Geological Age: Archean
| Rock Type | Rank | Composition | Texture | Relationship | Granodiorite | 1 | Adjacent |
|---|---|---|---|---|
| Vein | 2 | Quartz | Contains | |
| Mafic Pyroclastic Breccia | 3 | Pyroclastics | ||
| Gabbro | 4 |
May 28, 2020 (Therese Pettigrew) - East-trending, intermediate to felsic pyroclastics are interbedded with mafic volcanics and minor cherty and argillaceous sediments in the Labryinth Bay area. These rocks have been intruded by sills of gabbro and peridotite. The sequence is mostly north-facing, but some isoclinal folding or fault-block stacking may have occurred. Foliation is weak to moderate and essentially parallel to bedding. A small oval stock of medium-grained granodiorite cuts the volcanics obliquely; a fine-grained border phase may be present along the southwestern side of the stock. The granodiorite is massive and jointed, with rare, east-southeast-trending alignment of the few biotite grains. Carbonate and traces of pyrite occur on fractures and fine sericitic alteration is widespread. Quartz-filled fractures are locally numerous (Davies and Smith, 1988).
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pyrite | Economic | Ore | ||||
| 2 | Pyrrhotite | Economic | Ore | ||||
| 3 | Gold | Economic | Ore |
May 28, 2020 (Therese Pettigrew) - A zone of fracturing and shearing about 1 m wide lies near the southwestern contact of the granodiorite. The zone strikes 150 degrees and has a near-vertical dip. Pyrite is present along fractures and is also associated with irregular quartz veinlets. A vertical, 1.5 by 1.5 m shaft was sunk on the zone, and pieces of quartz on the dump are up to 20 cm wide. Bow (1899) noted the presence of 2 shafts, one 12 m deep and the other 32 m deep, and of a sugary white quartz vein, which could be traced 6 m at the deeper shaft. A grab sample of the vein from the deeper shaft contained 0.11 oz Au/ton, as reported by Thomson (1936). Grab samples of granodiorite cut by quartz, with pyrite along fractures, were taken from the dump of the shallower shaft and from a pit 200 m to the east in this study; they contained 9 ppb and 7 ppb gold, respectively (Davies and Smith, 1988). A 50 ton sample from the large shaft is reported to have averaged $14 (0.7 oz) Au/ton (Canadian Mining Review 1898, p. 258). At the old shaft, a 2 m wide felsite dyke occurs at or near the sheared contact between mafic pyroclastics and gabbro. Two samples from this showing are highly anomalous in antimony, returning 270 and 229 ppm Sb. One sample from the shaft area returned 340 ppb Au (Assessment report 52E10SW8577).
Mono - The geological setting of gold occurrences in the Lake of the Woods area
Publication Number: OFR5695 Page: 293-294 Date: 1988
Author: Davies J.C., Smith P.M.
Publisher Name: Ontario Geological Survey
Location:
MonoMap - Geology of the Shoal Lake-Western Peninsula area, District of Kenora
Publication Number: OFR5242 Page: 64-65, 112 Date: 1978
Author: Davies J.C.
Publisher Name: Ontario Geological Survey
Location:
Part - Geology of the north central part of the Lake of the Woods
Publication Number: ARV45-03.001 Page: 29 Date: 1997
Author: Thomson J.E.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Gold deposits of the Kenora-Fort Frances area, districts of Kenora and Rainy River
Publication Number: MDC016 Page: 37 Date: 1976
Author: Beard R.C., Garratt G.L.
Publisher Name: Ontario Division of Mines
Location:
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