|Location:||Mc Garry Township|
|Years of Operation:||1911, 1938 – 1996|
|Ounces of Gold Produced:||10,457,441|
Kerr Addison Mine (Producer)
Partial history as of 1979
MAIN METALS: Au, Ag
LOCATION: Approximately V* mile north-northwest of Virginiatown, 7* mile northwest of the tip of the Northeast Arm of Larder Lake, in central McGarry Township. Main shaft on boundary between patent ed claims L1751 (HJB30) and L1850 (HS166); underground workings in patented claims L1848 (HS165), L1850 (HS166) and L1905 (HJB29). Latitude 48.140, Longitude 79.580 . Map reference: ODM 50a, Township of McGarry.
GEOLOGY: The Larder Lake “break”, striking N600E through the centre of the property and dipping 75- 800N, represents the faulted contact between Timis kaming metasediments on the north and Keewatin metavolcanics on the south. In the vicinity of the mine workings, the hanging wall of the “break” con sists of intensely sheared greywacke. The footwall comprises a highly altered green and brown “car bonate zone”, up to 600 feet in width, which con tains irregular lenses of talc-chlorite schist and small irregularly shaped bodies of altered syenite intrusive rocks. South of this zone are bedded tuffs. Inter- banded with the tuffs, and lying south of them, are basic lava flows. The orebodies are of two different types. The car bonate type consists of irregular lenses of gold-bear ing quartz stockworks lying with in the highly altered and brecciated carbonate zone. Gold occurs in the free state randomly distributed throughout the quartz. The flow type of orebody consists of lenses of mineralized and silicified flow rock lying in the less altered flows and tuffs south of the carbonate zone. Pyrite mineralization, which is uniformly disseminated throughout the ore zone, contains most of the gold. The fracturing that permitted the formation of ore bodies can nearly all be associated with movements along the Kerr-Addison Fault and subsidiary faults, all of which are components of the Larder Lake “break”.
ECONOMIC FEATURES: The mine is Canada’s largest gold producer. The average recovered grade of the 34,228,275 tons of ore milled during the period 1938-1973 was 0.27 ounce of Au per ton. Ore re serves in 1976 stood at 502,560 tons averaging 1510.611 ounce of Au per ton and 330,170 tons aver aging 0.238 ounce of Au per ton (Canadian Mines Handbook 1977-78, p.172). OWNERSHIP: Kerr Addison Mines Limited.
HISTORY: 1906-1907: Kerr-Addison and Reddick claim groups staked. Surface work done. 1908-1911: Reddick and Kerr-Addison properties acquired by Associated Goldfields Mining Company Limited. Diamond-drilling and shaft (No.2) to 86 feet with 2,200 feet of lateral development on 83- foot level. 1920-1921: Shaft (No.1) to 325 feet with 1,085 feet of lateral development on levels at 60, 175 and 300 feet. During the period 1914-1921 more than 16,000 feet of diamond-drilling failed to intersect any orebodies. Work by Associated Goldfields Min ing Company Limited. 1936: Large scale sampling from four adits, 400 feet apart, driven into the hillside. Results not encouraging. One deep diamond-drill hole intersect ed 150 feet of ore grade material. No.1 Shaft de- watered and workings resampled. Shaft deepened to 716 feet with new level at 500 feet. 1937-present: No.3 Shaft to 3,995 feet with an in ternal shaft from 3,850-foot level to a depth of 6,022 feet. Underground development totalled 477,596 feet on 39 levels. 500-ton mill installed and commenced production in 1938. Capacity expanded to a maximum of 4,556 tons per day in 1960. Production steadily declined since 1961 to 935 tons per day at end of 1975.
|Years||Gold||Silver||Ore Milled||Recovered Grade|
|(ounces)||(ounces)||(tons)||(ounce of Au per ton)|
|1911, 1936 –||9,652,173||531,561||35,040,174||0.28|
In 1976, the mill was handling ore at an average rate of 730 tons per day.
Canadian Mines Handbook 1977-78, p.172.
OBM 1909, Vol.18, pt.1,p.130, 131.
ODM 1924, Vol.33, pt.3, p.23 (Kerr Addison; Reddick).
ODM 1941, Vol.50, pt.7, p.64-75.
ODM 1964, MRC3, p.35, 36.
Resident Geologist’s Files, Ontario Ministry of Natural Resources, Kirkland Lake.
Gordon, J.B., Lovell, H.L., de Grijs, Jan, and Davie, R.F.
1979: Gold Deposits of Ontario, Part 2: Part of District of Cochrane, Districts of Muskoka, Nipissing, Parry Sound, Sudbury, Timiskaming, and Counties of Southern Ontario; Ontario Geological Survey, Mineral Deposits Circular 18, 253p.