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File Created: 24-Jul-85 by BC Geological Survey (BCGS)
Last Edit:  25-May-06 by Garry J. Payie(GJP)

Summary Help Help

NMI
Name BOTTS LAKE Mining Division Golden
BCGS Map 082K079
Status Showing NTS Map 082K16W
Latitude 50º 47' 47" N UTM 11 (NAD 83)
Longitude 116º 22' 06" W Northing 5627373
Easting 544517
Commodities Magnesite, Copper Deposit Types E09 : Sparry magnesite
Tectonic Belt Omineca Terrane Ancestral North America
Capsule Geology

South of Botts Lake on Dunbar Creek, magnesite-bearing dolomite occurs in the lower part of the Middle Proterozoic Mount Nelson Formation of the Purcell Supergroup.

Botts Lake magnesite outcrops were traced over a distance of 118 metres along strike. The magnesite-bearing unit is at least 10 metres thick, strikes 130 degrees and dips 47 degrees east. The footwall consists of hard, aphanitic to fine-grained, dark grey to black dolomite which weathers pale grey. It is cut by pale grey dolomite and milky white quartz veinlets (<5 millimetres thick). Light to medium grey dolomite which weathers pale fawn in colour overlies the dark dolomite. The magnesite-bearing rock is snow white and weathers white or light grey. Field estimates indicate that the rock consists of a mixture of dolomite (40 to 70 per cent) and magnesite (30 to 60%) and is expected to have lower magnesia content than other magnesite deposits of the Brisco area. Traces of enargite (Cu3AsS4) were found in hairline fractures within this horizon.


Bibliography
EMPR AR 1964-199
EMPR FIELDWORK *1991, pp. 474-476
EMPR OF 1987-13

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