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File Created: 04-Aug-1989 by Peter S. Fischl (PSF)
Last Edit:  03-Jun-1997 by Peter S. Fischl (PSF)

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NMI
Name ANDERSON CREEK LIMESTONE, CHIPUIN MOUNTAIN Mining Division Kamloops
BCGS Map 092I072
Status Prospect NTS Map 092I12E
Latitude 050º 43' 06'' UTM 10 (NAD 83)
Longitude 121º 41' 53'' Northing 5619312
Easting 591907
Commodities Limestone Deposit Types R09 : Limestone
Tectonic Belt Intermontane Terrane Cache Creek
Capsule Geology

Limestone outcrops for 6 kilometres along a westerly trending ridge on the southeastern flank of Chipuin Mountain, 17 kilometres east-northeast of Lillooet.

A mass of limestone of the middle to Upper Permian Marble Canyon Formation (Carboniferous to Jurassic Cache Creek Complex) lies as a remnant along the south end of the granodioritic Mount Martley stock of Jurassic age. To the south, the limestone is overlain by andesite of the middle-Upper Cretaceous Spences Bridge Group. The limestone generally strikes 135 degrees and dips 35 to 78 degrees southwest near the southern margin of the deposit.

Various outcrops on a steep side of the ridge to the north of Anderson Creek expose mostly well bedded, dark grey and less commonly light grey to white, fine grained, rarely medium to coarse grained limestone frequently displaying black or white streaks. The limestone is locally veined by white calcite. A number of bulk samples were collected from three sites along the top of the ridge (Sites AC 1, AC 2, AC 3). Three bulk samples were analysed from each site. The bulk samples from the three sites averaged as follows in per cent (B.C. Hydro Report SE 8221, Table 3-1, Samples AC-1-1 to 1-3, AC-2-1 to 2-3, AC-3-1 to 3-3):

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Site CaO MgO SiO2 Al2O3 Fe2O3 TiO2 Na2O K2O P2O5 Ig.Loss

AC 1 51.86 0.57 6.98 0.54 0.28 0.23 0.22 0.02 0.02 40.05

AC 2 55.70 0.70 0.26 0.53 0.26 0.20 0.33 0.02 0.02 43.03

AC 3 55.21 0.86 0.76 0.62 0.20 0.20 0.32 0.02 0.02 41.94

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The deposit was mapped and sampled by B.C. Hydro in 1981 and 1982 during a search for dolomite in the Hat Creek area to scrub gases from a proposed coal-fired electrical generating plant utilizing pressurized fluidized bed combustion.

Bibliography
EMPR AR 1958-90
EMPR FIELDWORK 1981, pp. 270,271
EMPR PF (*B.C. Hydro Reports SE 8117 (1981), Addendum, pp. 1-3; SE 8221 (1983), pp. 3-1,3-2 (in 092INW098, Langley Lake)
GSC MAP 1010A; 1386A; 42-1989
GSC MEM 262, p. 16
GSC OF 165; 866; 980
GSC P 46-8; 47-10; 73-1A, p. 212; 74-49; 81-1A, pp. 185-189; 82-1A, pp. 293-297; 85-1A, pp. 349-358

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