The Westwold showing is located 19 kilometres west of Falkland, southwest of Westwold.

In this area, sedimentary rocks of the Devonian to Triassic Harper Ranch Group are in probable unconformable contact with Upper Triassic to Lower Jurassic Nicola Group sedimentary and volcanic rocks. Triassic to Jurassic granitic rocks of the Klotassin intrusions intrude the Harper Ranch and Nicola groups. Extensive Eocene Kamloops Group volcanic rocks cap the older rocks.

The Harper Ranch includes a Permian limestone, contact metamorphosed to marble, which has been quarried for industrial use. The 2000-metre long, 75-metre wide massive marble is in contact with granodiorite to the north and grades into a skarn zone of to the south at the Kenallan prospect (082LSW045). The marble is white, medium to coarse-grained and has abundant fractures at 10 to 40-centimetre spacings. Sampling in 1968 returned 54.8 per cent CaO, 0.47 per cent MgO, 0.07 per cent Fe2O3 and insolubles at 0.85 per cent (Minister of Mines Annual Report 1968, page 322).

The deposit was put into production in 1968 by Annis Industries Ltd. and up to 1970 produced 4810 tonnes of marble for stucco dash, roof rock, riprap and driveway rock.