Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI31M05NE00046

Record: MDI31M05NE00046

General

Mineral Record Identification
Record Name(s)	Silver Leaf Mine - 1907, J.J. Gray - 1968
Related Record Type	Partial
Related Record(s)
Record Status	Developed Prospect Without Reported Reserves or Resources
Date Created	1980-Oct-02
Date Last Modified	2023-Aug-24
Created By
Revised By

Commodities

Primary Commodities: Silver

Secondary Commodities: Cobalt

Location

Township or Area: Coleman

Latitude: 47° 22' 32.57" Longitude: -79° 39' 35.43"

UTM Zone: 17 Easting: 601169 Northing: 5247788 UTM Datum: NAD83

Resident Geologist District: Kirkland Lake

NTS Grid: 31M05NE

Point Location Description: Main Shaft

Location Method: AMIS Site Visit

Access Description: From hwy 11b turn southeast on Coleman Kerr Lake Road for 3.7kms; approx. 100 m past the Canadaka Mill site at the southwest edge of Kerr Lake, follow an old trial approx. 185m to Kerr Lake; following the west bend in the road at Kerr Lake for 65m; main shaft 30m to the north.

Exploration History

1905-1907: Silver Leaf Mining Company Limited - prospecting, trenching.. 1907-1927: Silver Leaf Mining Company Limited - 2 shafts (300 and 500 ft in depth) with underground workings. 1909-1919: property leased to Crown Reserves Mines Ltd. - 1 shaft developed. 1927: Harvie Mining Company Limited - cross-cutting towards the Imperial Crown Claim (lot 3 con 5). 1946-55: Lakeleaf Silver Mining Co. Ltd. - DD-7; dewatering of shaft, examination of workings. 1959: Coballoy Mines and Refiners Ltd. - DD-4. Circa 1968: property acquired by J.J. Gray

Geology

Province: Southern

Subprovince: Cobalt Basin

Supergroup: Huronian Supergroup

Formation Group: Cobalt Group

Geological Age: Paleoproterozoic

Lithology

Lithology Data
Rock Type	Rank	Composition	Relationship
Terrigenous-Clastic-Unsubdivided	1	Quartzite, Greywacke, Conglomerate	Host
Vein	2	Calcite	Host
Quartz Diabase	3	Quartz Diabase	Intrudes

Lithology Comments

Feb 12, 2015 (A Wilson) - The Cobalt series on this property consists of three members, a basal conglomerate under bedded greywacke, which in turn underlies white quartzite. At the Main shaft these sediments have a thickness of about 100 feet; 65 feet of bedded greywacke overlies 35 feet of basal conglomerate. This is approximately the greatest thickness of Cobalt series on the property, their northerly extension being cut off by the diabase. The dip of the sediments is about 15 to 20°N. The bottom contact of the diabase has a dip of 40 to 60 N; it does not follow any stratigraphic horizon in the Cobalt series. Satterly has described the varieties of diabase occurring on the 400-foot level of the North shaft.

Mineralization

Mineralization and Alteration
Rank	Mineral Name	Class	Economic Mineral Type	Alteration Mineral Type	Alteration Ranking	Alteration Intensity	Alteration Style
1	Silver	Economic	Ore
3	Smaltite	Economic	Ore

Mineralization Comments

Feb 12, 2015 (A Wilson) - The two most important silver-cobalt producing calcite veins are the Carson and the North veins. The Carson Vein is productive only within the Cobalt sediments by contrast the North Vein only within the Keewatin series. The Carson Vein had a horizontal lentgth of 75 ft and was explored to a depth of 50 ft. About 500 ft west of the main Shaft on the 75 ft level, a one inch wide calcite vein showed assays of 1000 oz Ag/ton.

Mineral Record Details

Classification
Rank	Classification
1	Vein (Cobalt-Type)

Characteristics
Rank	Characteristic
2	Stratabound
1	Vein

Production Data
Year	Tonnes	Commodities	Reference	Comment
1931	570	Silver 15410000 Cobalt 548	MDC010, p.207	547 kg Co; 495,443 oz Ag. Mine operated 1906-08; 1910, 1915, 1921, 1929 and 1931

References

File - Resident Geologist file CO-0790

Publication Number: Date:

Author:

Publisher Name:

Location: Kirkland Lake RGP office

Mono - Silver cobalt calcite vein deposits of Ontario

Publication Number: MDC010 Page: 84-86, 206-207 Date: 1968

Author: Sergiades A.O.