Seneca Superior Mine (Agnico-Cart Lake Mine), Coleman Township, Cobalt area, Cobalt-Gowganda region, Timiskaming District, Ontario, Canada

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A property consisting primarly of the land around and under Cart Lake. There are 4 shafts along the shore of the lake the most recently active one was the Seneca#1 shaft (1963-67) from which Silver Town Mines Ltd. carried out drilling. The coordinates in Mindat are for this shaft which is now capped. Total recorded production was 5,627,297 oz.

EXPLORATION AND DEVELOPMENT
1906: Seneca No.l Shaft was sunk to 110' with a level at 100'.
Seneca No.2 Shaft was sunk to 50'.
1908: Gould No.l Shaft; was sunk 200' with levels at 80', 118' & 200'.
Gould No.2 Shaft; (Agnico ML Cart Lake Shaft, 1966) was sunk 195'
with levels at 98', & 185'.
1911-16: Seneca No.2 Shaft was deepened with levels at 100', 200', 265' &
335' to develop the very productive Worth Vein,
Seneca Shaft No.l was deepened with an extensive second level

GEOLOGY
A sequence of Cobalt conglomerate, slate and greywacke,
about 550' thick, rests unconformably on Keewatin rocks. The unconformity
follows a W striking paleovalley. The very productive Worth Vein forms an oval-shaped vertical lens as an oreshoot, 500' in horizontal length, that strikes NE. Production was largely restricted to the vicinity of a flat lying lens of well cleaved slate up to 30' thick between 200' and 265'
levels of the Seneca Shaft No.2. Above in the greywacke, and in th
upper part of the slate, the ore assayed 3,500 ozs./ton; below
towards the Cobalt-Keewatin unconformity this progressively
decreased to 900 ozs./ton.

References

Sergiades, A.O. (1968) Silver Cobalt Calcite Vein Deposits of Ontario, Ontario Dept. of Mines, MRC No.10.

Mineral List

Maucherite

Silver

2 entries listed. 2 valid minerals.