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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  17-Feb-2003 by Ron McMillan (RHM)

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NMI
Name EIGHTYTHREE MILE LAKE Mining Division Clinton
BCGS Map 092P044
Status Showing NTS Map 092P06W
Latitude 051º 26' 57'' UTM 10 (NAD 83)
Longitude 121º 22' 41'' Northing 5701024
Easting 612705
Commodities Sodium Carbonate Deposit Types F09 : Playa and Alkaline Lake Evaporites
Tectonic Belt Intermontane Terrane Overlap Assemblage
Capsule Geology

Eighty-three Mile Lake contains sodium carbonate-rich brine, and is located 500 metres west of Highway 97, 25 kilometres south of 100 Mile House.

The lake is is a semi-evaporitic playa lake. It is located in the "Green Timber Plateau" area (EMPR Bulletin 4), a semi-arid plateau area averaging 1130 metres elevation which is part of the Cariboo Plateau. The area is underlain by alkaline plateau basalt flows of the Miocene to Pleistocene Chilcotin Group, mantled by a thin cover of glacial till and glaciofluvial sediments. Annual precipitation averages between 300 and 400 millimetres (EMPR Paper 1991-1).

Eighty-three Mile Lake in 1937 (EMPR Bulletin 4) covered an area of approximately 12 hectares and contained brine to a maximum depth of about 60 centimetres. At 16 degrees celsius, the brine had a density of 1.085 and contained 4.85 per cent solids. The solids were composed of 97.2 per cent sodium carbonate and 2.8 per cent sodium chloride. No "winter crystal" (crystalline sodium carbonate minerals) is known to precipitate in the brine.

Bibliography
EMPR BULL 4-5
EMPR P 1991-1
EMPR ASS RPT 20080
GSC MEM 363
GSC MAP 1278A

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