Ontario Geological Survey
Permanent Link to this Record:
MDI31M05NE00061
| Record Name(s) | O'Brien Mine RL403 - 1903, Cross Lake Lease - 1940, Nipissing O'Brien Mines Ltd. - 1952, Agnico Mines Ltd. - 1958, Mining Location 403 - 1958 |
|---|---|
| Related Record Type | Compound |
| Related Record(s) | |
| Record Status | Past Producing Mine Without Reserves or Resources |
| Date Created | 1980-Oct-10 |
| Date Last Modified | 2023-Aug-24 |
| Created By | |
| Revised By |
Primary Commodities: Cobalt, Silver
Secondary Commodities: Nickel, Copper, Gold
Township or Area: Coleman
Latitude: 47° 23' 57.31" Longitude: -79° 40' 4.56"
UTM Zone: 17 Easting: 600513.66 Northing: 5250393.5 UTM Datum: NAD83
Resident Geologist District: Kirkland Lake
NTS Grid: 31M05NE
Point Location Description: Main Shaft
Location Method: Data Compilation
1905-1937: M.J. O'Brien - five shafts with about 12 miles of drifts, cross-cuts, raises and winzes; 1940-52: Cross Lake Lease - development work confined to No. 2 shaft. 1952-58: Nipissing O'Brien Mines Ltd. – No. 2 shaft deepened by 10 ft.; No.615 Winze sunk 115 ft. from 340 level of the main shaft, No. 14 shaft sunk, other development work 4424 ft. drifting; 1044 ft. raises 2583 ft. and 204 U/G drill holes 39,711 ft. 1958-64: development work restricted to main shaft.
Province: Southern
Subprovince: Cobalt Basin
Supergroup: Huronian Supergroup
Formation Group: Cobalt Group
Geological Age: Paleoproterozoic
| Rock Type | Rank | Composition | Texture | Relationship | Conglomerate | 1 | Host |
|---|---|---|---|---|
| Mafic lava flow-unsubdivided | 2 | Host | ||
| Ironstone-unsubdivided | 3 | Host | ||
| Vein | 4 | Calcite, Quartz | Contains | |
| Lamprophyre-Unsubdivided | 5 | Contains | ||
| Gabbroid-Unsubdivided | 6 | Host |
Jul 26, 2017 (A Wilson) - The Nipissing diabase on this claim lies on the northwest limb of the Peterson Lake diabase basin. Maps P.97 and 97A show the bottom contact of the diabase striking north easterly and dipping southeast. This contact cuts across the Cobalt series - Keewatin contact at a small angle; clearly the Cobalt series-Keewatin contact had no direct influence in guiding the course of intrusion of the diabase. The Cobalt series lie on the southward flank of a trough in the underlying Keewatin. Where exposed at surface the Keewatin consists largely of andesite lava but in the north part of the claim (below the Nipissing diabase and Cobalt series) are Keewatin sediments as shown by Knight. Lamprophyre dikes occur abundantly cutting through the Keewatin.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Silver | Economic | Ore | ||||
| 2 | Smaltite | Economic | Ore | ||||
| 3 | Chalcopyrite | Economic | Gangue | ||||
| 4 | Niccolite | Economic | Gangue |
| Year | Tonnes | Commodities | Reference | Comment |
|---|---|---|---|---|
| 1966 | 1 |
Silver 1737813 Cobalt 2466 Copper 967 Nickel 672 |
RGO FILES | N/A |
| 1958 | 1 |
Silver 73261409 Cobalt 93577 Copper 50043 Nickel 12328 |
MRC 10, p.180-181 | total production 1954-1958 (includes other areas) - no tonnage data |
| 1951 | 21167 |
Silver 665674309 Cobalt 972939 Copper 16390 Nickel 84635 |
MDC 10, p.180-181 | Total Production 1923-1951 |
| 1922 | 12599 |
Silver 619786945 Cobalt 348269 |
MDC 10, p.180-181 | Total Production 1905-1922 |
File - Resident Geologist file CO-0727
Publication Number: Date:
Author:
Publisher Name:
Location: Kirkland Lake RGP office
Part - Geology of the mine workings of Cobalt and South Lorrain silver areas
Publication Number: ARV31-02.001 Page: 121-128 Date: 1998
Author: Knight C.W.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Silver cobalt calcite vein deposits of Ontario
Publication Number: MDC010 Page: 84-86, 180-181 Date: 1968
Author: Sergiades A.O.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Preliminary report on part of Coleman Township, concession 6, lots 1 to 6, District of Timiskaming
Publication Number: PR1961-03 Page: 58-66 Date: 1998
Author: Thomson R.
Publisher Name: Ontario Dept. of Mines
Location:
Map - Cobalt silver area, northern sheet, Timiskaming District
Publication Number: M2050 Scale: 1:12,000 Date: 1997
Author: Thomson R.
Publisher Name: Ontario Dept. of Mines
Location:
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