Ontario Geological Survey
Permanent Link to this Record:
MDI31M05NE00038
| Record Name(s) | M.J. O'Brien Ltd. - 1923, Cross Lake Lease - 1940, L.J. O'Shaughnessy (Shag Silver Mines) - 1948, Agnico Mines Ltd. - 1950, Deer Horn Mines Ltd. - 1958 |
|---|---|
| Related Record Type | Compound |
| Related Record(s) | |
| Record Status | Past Producing Mine Without Reserves or Resources |
| Date Created | 1984-Nov-02 |
| Date Last Modified | 2023-Aug-24 |
| Created By | |
| Revised By |
Primary Commodities: Cobalt, Silver
Secondary Commodities: Copper, Lead, Nickel, Zinc
Township or Area: Coleman, Coleman, Coleman
Latitude: 47° 23' 27.84" Longitude: -79° 38' 43.76"
UTM Zone: 17 Easting: 602223 Northing: 5249513 UTM Datum: NAD83
Resident Geologist District: Kirkland Lake
NTS Grid: 31M05NE
Point Location Description: Cross Lake O'Brien Shaft.
Location Method: AMIS Site Visit
1905: extensive surface prospecting began; 1908: Trinity Shaft sunk to 150 ft.; 1922: Cross Lake O’Brien No. 1 vein discovered; 1922-53: extensive DD program; Cross Lake O’Brien Shaft of Main shaft sunk to a depth of 590 ft. with levels at 270 ft., 395 ft. and 450 ft. 1958-64: Main Shaft deepened to 900 ft., drifting (5813 ft.) cross cuttings 2,548 ft. raising 10,025 ft. and 1037 UG DD holes.; 134,054 ft.; 9 new silver zones discovered and 6 were brought into production. 1979: St. Joseph Exploration L td.- compilation and extensive surface drilling southeast of shaft.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| CO-0729//63.3829 | 31M05NE0420 | 31M05NE0420 |
Province: Southern
Subprovince: Cobalt Basin
Supergroup: Huronian Supergroup
Formation Group: Cobalt Group
Geological Age: Paleoproterozoic
| Rock Type | Rank | Composition | Texture | Relationship | Diabase | 1 | Diabase | Contains |
|---|---|---|---|---|
| Granitoid-Unsubdivided | 2 | Footwall | ||
| Vein | 3 | Host |
Jul 28, 2017 (A Wilson) - Within the property, Nipissing diabase, about 500 ft. thick forms the Nipissing Diabase Arch that trends NNE and separates the Peterson from the Lorrain basin. In the eastern part, Cobalt sediments 225 ft. thick underlie the diabase about the crest of the arch; in the west part, Keewatin rocks cut by Haileyburian lamprophyre dikes occur in underground workings from the main shaft. The west portion of the property is also crossed by NW striking Cross Lake Fault and Cross Lake olivine diabase dike. The most important producing veins found till 1959 are Nos. 1,2, and 5. Vein No. 1 is arcuate in nature and strikes generally southwest; it was productive mostly in the diabase. Veins No. 2 and 6 striking west-northwest with steep dips were most productive in the Keewatin rocks. Vein No. 10 is closely associated with WNW striking Vein No. 10 Fault. After 1960, nine silver zones were discovered; vein No. 7, 16 and 27 account for most of the production.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Argentite | Economic | Ore | ||||
| 2 | Chalcopyrite | Economic | Ore | ||||
| 3 | Chloanthite | Economic | Ore | ||||
| 5 | Galena | Economic | Ore | ||||
| 6 | Lollingite | Economic | Ore | ||||
| 7 | Marcasite | Economic | Ore | ||||
| 8 | Silver | Economic | Ore | ||||
| 9 | Sphalerite | Economic | Ore | ||||
| 10 | Tetrahedrite | Economic | Ore |
| Rank | Classification |
|---|---|
| 1 | Vein (Cobalt-Type) |
| Year | Tonnes | Commodities | Reference | Comment |
|---|---|---|---|---|
| 1984 | 121677 | MDC 10, p.124-125 | 2,910,149 lbs cobalt; 41,328,539 oz. silver; 186,421 lbs nickel; 474,998 lbs copper | |
| 1984 | 121677 |
Silver 88523699 Cobalt 44094 Copper 78365 Nickel 17635 |
Silver Cobalt Calcite Vein Deposits of Ontario, p.124-125 | total production 1960-1966 (possible production 1928-1942 not included) |
Book - Deerhorne Mining Ltd.
Publication Number: CIM Date: 1967
Author:
Publisher Name: CIM 1967
Location: Kirkland Lake RGP office
File - Resident Geologist files CO-0646, CO-0728
Publication Number: Date:
Author:
Publisher Name:
Location: Kirkland Lake RGP office
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:
Compend - Annual report of the Regional and Resident Geologists, 1979
Publication Number: MP091 Page: 81 Date: 1980
Author: Kustra C.R.
Publisher Name: Ontario Geological Survey
Location:
Mono - Silver cobalt calcite vein deposits of Ontario
Publication Number: MDC010 Page: 84-6, 124-25, 180-81 Date: 1968
Author: Sergiades A.O.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Preliminary report on part of Coleman Township, concession 5, lots 1 to 6, District of Timiskaming
Publication Number: PR1961-04 Page: 15-22 Date: 1998
Author: Thomson R.
Publisher Name: Ontario Dept. of Mines
Location:
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