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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  20-Oct-1986 by Brian Grant (BG)

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Name 61 MILE CREEK Mining Division Clinton
BCGS Map 092P023
Status Showing NTS Map 092P05E
Latitude 051º 16' 55'' UTM 10 (NAD 83)
Longitude 121º 31' 54'' Northing 5682203
Easting 602404
Commodities Hydromagnesite Deposit Types F09 : Playa and Alkaline Lake Evaporites
Tectonic Belt Intermontane Terrane Overlap Assemblage
Capsule Geology

The 61 Mile Creek hydromagnesite deposits are located within a swampy area at the headwaters of 61 Mile Creek and about three kilometres east of Goose Lake and 1.6 kilometres northwest of the head of 61 Mile creek.

The general region contains numerous semi-evaporitic playa lakes that have been termed 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).

Several hydromagnesite deposits are present in the area adjacent to a small swampy lake in a depression between low hills.

White hydromagnesite with what is described as a typical cauliflower-like surface texture covers about 1.1 hectares. The material has been pitted to a depth of 30 centimetres but no data is available to indicate total thickness of the hydromagnesite nor of the character of the underlying material.


Analysis of Three Surface samples:

MgO CaO Fe+Al SiO2 H2O CO2 H2O+CO2

1 38.00 1.6 1.7 9.80 16.0 32.9 -

2 34.4 1.76 0.69 11.60 - - 48.16

3 32.75 3.32 0.67 12.40 - - 47.74


EMPR BULL *4, pp. 103, 113-114, 125
EMPR OF 1987-13