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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  24-Jul-1985 by BC Geological Survey (BCGS)

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Name THREE MILE LAKE Mining Division Clinton
BCGS Map 092P003
Status Showing NTS Map 092P04E
Latitude 051º 03' 31'' UTM 10 (NAD 83)
Longitude 121º 33' 52'' Northing 5657323
Easting 600603
Commodities Magnesium Sulphate Deposit Types F09 : Playa and Alkaline Lake Evaporites
Tectonic Belt Intermontane Terrane Overlap Assemblage
Capsule Geology

Three Mile Lake is located west of Highway 97, 4 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.

Three Mile Lake contains magnesium sulphate-rich brine which in earlier times was of much higher concentration than in 1937 (EMPR Bulletin 4, page 41). In 1937, the brine had a density of up to 1.008 and contained up to 0.66 per cent dissolved solids composed mainly of 74 per cent magnesium sulphate, 5 per cent sodium sulphate, 1.5 per cent sodium chloride, 7 per cent sodium carbonate and 12.5 per cent calcium sulphate.

EMPR P 1991-1
GSC MEM 118-53, 363