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File Created: 24-Jul-85 by BC Geological Survey (BCGS)
Last Edit:  17-Feb-03 by Ron McMillan(RHM)

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NMI
Name SODIUM LAKE, HUTCHISON LAKE, SODA LAKE, MARSDEN LAKE Mining Division Clinton
BCGS Map 092P034
Status Showing NTS Map 092P06W
Latitude 51º 18' 12" N UTM 10 (NAD 83)
Longitude 121º 16' 48" W Northing 5684962
Easting 619899
Commodities Sodium Carbonate Deposit Types F09 : Playa and Alkaline Lake Evaporites
Tectonic Belt Intermontane Terrane Overlap Assemblage
Capsule Geology

Sodium Lake is located 8 kilometres east of 70 Mile House.

The lake 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 and host to several playa lakes. 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).

Soda Lake (Hutchison Lake in EMPR Bulletin 4, page 22) contains sodium carbonate-rich brine and the muddy shoreline is heavily encrusted with natron. Brine covered an area of approxiamtely 6 hectares to a maximum depth of 3 metres in October of 1937. The specific gravity of the brine was 1.0685 and it contained 7 per cent solids conposed of 96.3 per cent sodium carbonate, 3.3 per cent sodium chloride and 0.1 per cent sodium sulphate (EMPR Bulletin 4, page 23).

Bibliography
*EMPR BULL 4-22
EMPR P 1991-1
GSC MEM 363, 118
GSC MAP 1278A
CANMET: DEPT OF MINES, MINES BR RPT 642 P95

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