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File Created: 24-Jul-85 by BC Geological Survey (BCGS)
Last Edit:  20-Apr-08 by Mandy N. Desautels(MND)

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NMI 082G12 Mg1
Name MARYSVILLE, PERRY CREEK Mining Division Fort Steele
BCGS Map 082G051
Status Past Producer NTS Map 082G12W
Latitude 49º 34' 40" N UTM 11 (NAD 83)
Longitude 115º 58' 33" W Northing 5492192
Easting 574039
Commodities Magnesite Deposit Types E09 : Sparry magnesite
Tectonic Belt Omineca Terrane Ancestral North America
Capsule Geology

Magnesite forms a bed which is conformably interbedded with quartzites of the Lower Cambrian Cranbrook Formation. It is underlain by a sequence of thinly banded, reddish quartzitic and buff magnesite beds and is overlain by magnesite interstratified with thin, greenish argillite beds and locally thin limestone. It varies from coarse to finely crystalline, weathers rough and commonly has a rusty brown surface. Fresh surfaces are pearly grey, white or cream-coloured and are cut by minor quartz veins or host to knots of quartz. The best bed of magnesite is about 15 metres thick and samples indicate the following chemistry: 4.54 per cent SiO2, 2.4 per cent Fe2O3, 0.4 per cent Al2O3, 0.79 per cent CaO, 43.7 per cent MgO and 48 per cent Loss On Ignition.

Minor production has been reported for the Marysville deposit (Z.D. Hora, personal communication, 1990), but no figures are available.

Bibliography
EMPR AR 1937-A25; *1941-78; 1947-219; *1959-176; 1961-150; *1964-187
EMPR BULL 76 p. 77
EMPR OF 1987-13; *1988-14
EMPR PF (Letter and graph from Richard B. Berg to Kirk Hancock, October 27, 1994)
GSC MAP 396A; 15-1957; 11-1960
GSC MEM 76; *207, pp. 18,56
GSC SUM RPT 1932, Part AII, p. 101

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