Ontario Geological Survey
Permanent Link to this Record:
MDI52N02SE00011
| Record Name(s) | Bobjo - 1925, New York Oils - 1939 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Developed Prospect Without Reported Reserves or Resources |
| Date Created | 1985-Jul-23 |
| Date Last Modified | 2022-Mar-23 |
| Created By | |
| Revised By |
Primary Commodities: Gold, Zinc
Secondary Commodities: Silver
Township or Area: Earngey
Latitude: 51° 6' 1.77" Longitude: -92° 37' 27.98"
UTM Zone: 15 Easting: 526296 Northing: 5661067 UTM Datum: NAD83
Resident Geologist District: Red Lake
NTS Grid: 52N02SE
Point Location Description: Precise
Location Method: Data Compilation
Access Description: South Bay Road
Gold was found on the property in 1925 (Laidlaw). Property was optioned to Coniasgas Mines Ltd., who carried out an unknown amount of surface work including sampling, stripping, and trenching. 1928-29: Bobjo Mine carried out surface and underground development work, sinking an 82 m shaft on two levels. Over 487 m of lateral development was completed but only minimal mining was done. An open cut was exploited where high-grade gold was processed through a small stamp mill on the property for a minor production of 361.7 ounces of gold and 29 ounces of silver. Between 1937-1939 surface exploration program was carried out by New York Oils Ltd. under T.L. Fawcett, with 2134 m of diamond drilling completed. No work was recorded and the project was shut down due to the war effort. 2006-07 Mainstream Minerals Corp, and King's Bay Gold Corporation Ltd carried out VLF-EM and ground magnetic geophysical surveys and a diamond drilling program of 28 drill holes totalling 5717.1 m. 2008: Mainstream Minerals drilled 5 DDH. 2010: Premier Gold optioned the property and conducted an airborne mag/EM survey and drilled 5 DDH totalling 1679.3 m.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| RL EAR K #75 / 2.37462 | 20000003525 | 20000003525 |
| 2.50290 | 20000006394 | 20000006394 |
| 2.49474 | 20000007642 | 20000007642 |
Province: Superior
Subprovince: Uchi
Terrane: North Caribou
Domain: Uchi
Belt: Birch-Uchi
Geological Age: Archean
| Rock Type | Rank | Composition | Texture | Relationship | Mafic lava flow-unsubdivided | 1 | Basalt | Contains |
|---|---|---|---|---|
| Quartz-Rich Granitoid | 2 | Adjacent |
Jun 13, 2019 (Therese Pettigrew) - The Bobjo property is underlain by intermediate to mafic, massive to pillowed, locally variolitic volcanics and associated fragmentals. The rock units typically strike northeast to southwest and are mainly composed of homogenous mafic metavolcanic flows and pillow lavas intruded by north-trending quartz-feldspar porphyry dykes and gabbro sills (Parker and Atkinson, 1992; Assessment report 20000006394).
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pyrite | Economic | Ore |
Feb 03, 2012 (A McKee) - GRADE 1939(?) GRAB SAMPLES: FROM MAIN VEIN TR.-0.06 OPT AU, PRODUCTION 1928-29: 362 OZ AU AND 29 OZ AG. 2007- 27 Drill holes completed in this area with multiple gold intercepts. And many holes returned visible gold indications. Drill hole BJ07-14, the first four assays were in V.G with the best value excedding 6.3opt over .03m of core length, from 0.0-3.9 m. The average gold grade was 0.928 opt with the best intercept from 0.6-1.5 m averaging 3.82 opt in gold. (several assays returned from 27 drill holes, refer to assessment file 2.37462 for more details.)
Jun 13, 2019 (Therese Pettigrew) - Gold found on the Bobjo property is typically associated with pyrite mineralization within and proximal to shear-hosted quartz +/- carbonate +/- chlorite veins, or as cryptocrystalline mineralization within what look like barren, milky quartz veins. Gold mineralization appears to follow a preferred orientation, generally tending west-northwest which corresponds to the orientation of D2 deformation within the Red Lake-Uchi Greenstone Belt. Quartz stringers and veins host carbonate, sericite, chlorite, pyrite, pyrrhotite, and fine visible gold. A grab sample taken from spherulitic felsic flows on the property by OGS staff member B.T. Atkinson in 1992 assayed 290 ppb Au, 4 ppm Ag, 420 ppm Cu, 3.1% Zn, and 59 ppm Cd (Parker and Atkinson, 1992). Assays from the 2010 drill program returned values up to 4.796 g/t Au, with 2.96 g/t Au over 2.5 m found in DDH RG1001 and 6.127 g/t Au over 0.7 m in DDH RG1004 (Assessment report 20000006394).
| Year | Tonnes | Commodities | Reference | Comment |
|---|---|---|---|---|
| 1929 | 1 |
Silver 900 Gold 11275 |
OFR 5835, Page 185 and ODM Annual Report, v. 39, pt.1, p. 8 | No production tons or grade quoted , only ounces produced 11 275 g Au and 900 g Ag (362 oz Au and 29 oz Ag). |
Map - Earngey and Birkett townships, Kenora District
Publication Number: M2428 Scale: 1:31,680 Date: 1980
Author: Thurston P.C.
Publisher Name: Ontario Geological Survey
Location:
Mono - Gold deposits of Ontario, part 1, districts of Algoma, Cochrane, Kenora, Rainy River, and Thunder Bay
Publication Number: MDC013 Page: 220 Date: 1971
Author: Ferguson S.A., Groen H.A., Haynes R.
Publisher Name: Ontario Dept. of Mines and Northern Affairs
Location:
Part - Geology and gold deposits of the Uchi-Slate lakes area
Publication Number: ARV48-08.001 Page: 40-41 Date: 1997
Author: Bateman J.D.
Publisher Name: Ontario Dept. of Mines
Location:
MonoMap - Geology of the Earngey-Costello area, District of Kenora, Patricia Portion
Publication Number: R234 Page: 79-80 Date: 1985
Author: Thurston P.C.
Publisher Name: Ontario Geological Survey
Location:
Part - Statistical review of Ontario's mineral industry in 1929
Publication Number: ARV39-01.001 Page: 8 Date: 1997
Author: Rogers W.R., Young A.C.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Gold occurrences, prospects and past-producing mines of the Birch-Confederation lakes area
Publication Number: OFR5835 Page: 185-186 Date: 1992
Author: Parker J.R., Atkinson B.T.
Publisher Name: Ontario Geological Survey
Location:
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