Limestone was once quarried for marble on the south side of Sheep Creek, 6 kilometres west of its confluence with the Salmo River.

The quarry is developed in limestone, with some interbedded quartzite, of the Lower(?) and Middle Ordovician Active Formation (correlative in part with the Glenogle Formation of the western Rocky Mountains). The limestone strikes 020 degrees and dips between 60 and 70 degrees east. The band can be traced southwest from Sheep Creek up the valley side to a considerable height above the valley floor. It is badly shattered and in places cut by quartz veinlets. An irregular set of joints strike 075 degrees. The limestone produced from the quarry is fine to coarse grained and white to grey banded.

A small amount of limestone, quarried by W. McArthur before 1914, was used in the Nelson Post Office.