A lens of fine grained, cream to pale blue, mottled and streaked dolomite forms a small elongate hill, 15 metres west of the Canadian Pacific Railway 180 metres north of the saw mill at Boundary Falls. The lens is enclosed in greenstone of the Carboniferous or older Anarchist Group. The deposit is 52 metres long and 18 metres wide.

A small quarry is situated in the south end of the deposit. The dolomite was burnt in an adjacent lime kiln sometime earlier this century.