The Edison occurrence is located on Edison Creek at an elevation of 730 metres. The Superior occurrence is located metres to the east and at an elevation of 680 metres.
The area is located in the Insular Belt of the Cordillera. The region is underlain mainly by volcanics and crystalline rocks and minor sediments.
At the occurrence, northwest striking, moderately west dipping calcareous sediments of the Parson Bay Formation overlie Karmutsen Formation tholeiitic basalts, both of the Upper Triassic Vancouver Group. Overlying Lower Jurassic Bonanza Group andesitic to rhyodacitic lava, tuff and breccia are coeval with, or genetically related to, Island Plutonic Suite granodiorite, that in this area occurs as small, isolated plutons.
Locally, lenses of chalcopyrite-pyrrhotite associated with garnet-epidote altered limestone and limy tuff, intruded by mafic and felsic dikes.
In 1972, trenching and diamond drilling on the showings yielded:
------------------------------------------------------------------------------------------Showing Sample Copper Zinc Silver Length(number) (type-number) (per cent) (per cent) (grams per tonne) (metres) No.2 Trench-92427 4.2 0.20 73.5 0.75 No.2 DDH-Y-3 0.2 N/A 1.7 1.98 No.3 Trench-5885 7.75 0.59 126.5 1.35 No.3 DDH-Y-1 1.76 N/A 23.3 0.33 No.8 Trench-92302 11.62 0.46 163.5 0.90 No.8 DDH-Y-1 1.92 N/A 19.6 8.55------------------------------------------------------------------------------------------
Showing Sample Copper Zinc Silver Length
(number) (type-number) (per cent) (per cent) (grams per tonne) (metres)
No.2 Trench-92427 4.2 0.20 73.5 0.75
No.2 DDH-Y-3 0.2 N/A 1.7 1.98
No.3 Trench-5885 7.75 0.59 126.5 1.35
No.3 DDH-Y-1 1.76 N/A 23.3 0.33
No.8 Trench-92302 11.62 0.46 163.5 0.90
No.8 DDH-Y-1 1.92 N/A 19.6 8.55
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(Assessment Report 4425)
The Number 3 showing is believed to represent the original Edison occurrence, the Number 2 and 8 showings lie 200 and 90 metres west, respectively.
Sphalerite and galena in skarn beds 10 to 15 centimetres thick, striking 285 degrees and dipping 70 degrees north are reported inter-bedded with barren greenish fine-grained limestone in Edison Creek. This style of mineralization is unique for the chalcopyrite-pyrrhotite Yreka Camp.
Work History
The area has been explored in conjunction with the Yreka (MINFILE 092L 052) mine and was first staked in 1898. In 1970 and 1971, Green Eagle Mines completed programs of airborne electromagnetic and magnetic geophysical surveys, rock and soil sampling and ground magnetic survey on the area. In 1972, Iso Explorations completed a program of ground geophysical surveys, geological mapping, soil sampling, trenching and 4 diamond drill holes totalling 582 metres. In 1998 and 1999, Talltree Resources completed programs of rock and soil sampling, geological mapping and a ground electromagnetic survey on the area. During 2015 through 2019, Karmamount Mineral Exploration Inc. completed minor programs of geological mapping and geochemical (rock and soil) and biogeochemical sampling and a 12.9 line-kilometre induced polarization survey on the area as the Yreka property.
