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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  10-Jan-1994 by George Owsiacki (GO)

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NMI
Name THREE G'S Mining Division Revelstoke
BCGS Map 082L098
Status Showing NTS Map 082L16W
Latitude 050º 57' 04'' UTM 11 (NAD 83)
Longitude 118º 24' 38'' Northing 5645336
Easting 400920
Commodities Graphite, Rare Earths Deposit Types
Tectonic Belt Omineca Terrane Kootenay, Monashee
Capsule Geology

At the Three G's occurrence, a graphite-monazite showing occurs near the Monashee decollement. Allochthonous cover rocks comprise Precambrian-Paleozoic(?) Shuswap Metamorphic Complex granitic gneiss, paragneiss, garnet sillimanite schist, minor quartzite, marble and amphibolite, which are separated by the Monashee decollement from underlying Precambrian-Paleozoic(?) Monashee Complex (Group) calcsilicate gneiss, impure marble, sillimanite kyanite schist and local carbonatite. Pegmatites intrude the Shuswap rock series.

X-ray diffraction studies identified graphite, quartz, pyrrhotite, pyrite, and annite and siderophyllite which are trioctahedral micas of ideal composition. Geochemical analysis also yielded 271,000 parts per million lanthanum, 272 parts per million praseodymium, 825 parts per million neodymium, 83 parts per million samarium, 40 parts per million gadolinium, 6 parts per million dysprosium and 596 parts per million thorium (Thomas, 1991).

A rock grab sample from the showing analysed 3.8 per cent carbon (Thomas, 1991).

Bibliography
EMPR FIELDWORK 1987, pp. 54-58
EMPR OF 1988-13; 1988-26; 1990-30
EMPR PF (*Private report, G.E. Thomas, June 23, 1991)
GSC MAP 143A; 1059A
GSC MEM 296
GSC OF 481; 658
EMPR PFD 4408, 4409, 4410, 521186

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