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.