Dolomite of the Ordovician to Silurian Beaverfoot Formation outcrops just south of Cedared Creek, 3.2 kilometres northwest of Spillimacheen. The dolomite continues to outcrop southeastward along the mountainside for 8.75 kilometres on the west limb of the Kindersley Creek Anticline. The underlying Ordovician Mount Wilson Quartzite outcrops to the east. The strata generally strike 138 degrees and dip 75 degrees southwest.

The deposit is comprised of nearly white weathering, brownish grey, thickly bedded, fine grained dolomite, with some beds of brown weathering, brecciated dolomite cemented in part by white calcite. A sample of the white weathering dolomite from the base of the mountain contained 30.91 per cent CaO, 21.54 per cent MgO, 0.74 per cent SiO2, 0.25 per cent Al2O3, 0.50 per cent Fe2O3 and 0.02 per cent sulphur (Canada Bureau of Mines Report 811, page 214, Sample 87).