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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  19-Feb-2003 by Ron McMillan (RHM)

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NMI
Name CLINTON LAKE, ADA B (L4792), CLIFFORD (L4791), J.T.M. #1-8 Mining Division Clinton
BCGS Map 092P003
Status Past Producer NTS Map 092P04E
Latitude 051º 04' 28'' UTM 10 (NAD 83)
Longitude 121º 35' 06'' Northing 5659056
Easting 599129
Commodities Magnesium Sulphate Deposit Types F09 : Playa and Alkaline Lake Evaporites
Tectonic Belt Intermontane Terrane Overlap Assemblage
Capsule Geology

Clinton Lake is located east of Highway 97, 1.5 kilometres south of Clinton. Physiographically it is located near the edge of the Cariboo Plateau. Annual precipitation averages between 300 and 400 millimetres (EMPR Paper 1991-1).

The lake is a semi-evaporitic playa lake located in the dry valley along the Ashcroft-Clinton road. Bedrock includes marine sedimentary (ribbon chert, limestone and argillite) and volcanic rocks (basic flows and tuffs) of the Permian to Upper Triassic Cache Creek Group; Jurassic sedimentary rocks (chert pebble conglomerate, greywacke, shale and grit); and non-marine sediments (shale, sandstone, tuff, diatomite, conglomerate and breccias) of the Miocene Deadman River Formation.

Clinton Lake contains magnesium sulphate-rich brine and has at times contained layers of epsomite. It covers an area of approximately 10 hectares and is covered with brine to depths ranging from a few centimetres to metres; the epsomite crystallizing at times of low water levels. Between 1918 and 1920, approximately 1800 tonnes of epsomite was harvested from the lake, and more than 900 tonnes was sold (EMPR Bulletin 4). The brine had a density of 1.123 and contained 13.97 per cent dissolved solids composed mainly of 84.1 per cent magnesium sulphate, 3.45 per cent sodium sulphate, 9.5 per cent sodium chloride and 1.16 per cent potassium chloride. Assessment Report 8051 reports that random sampling of epsomite "evaporite residue" returned values of 19.5 per cent MgO and 49.1 per cent SO4, indicating the material is nearly pure epsomite.

Bibliography
EMPR AR *8051
EMPR BULL 4-40
EMPR P 1991-1
EMPR AR 1918-228, 1922-155
GSC MEM 363
GSC MAP 1278A

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