The IJR white marble occurrence is located on the eastern shore of Nimpkish Lake, approximately 4 kilometres north of the community of Nimpkish.

The area is underlain by Mesozoic rocks of the Karmutsen Formation volcanics, which forms the footwall, the Quatsino limestone, divided into two members, the lower member, that forms the white marble deposit, and the overlying grey limestone member, and the overlying Parsons Bay Formation and Bonanza volcanics. The sedimentary and volcanic rocks have been intruded by plutonic rocks including Cretaceous batholithic rocks, which include granite to diorite, intrusives. Numerous basic dikes have also intruded the volcanic, carbonate and granitic rocks.

Locally, a white marble layer, 10 to 15 metres thick and exposed over 1350 by 1350 metres, is hosted in the lower member of the Quatsino Formation. The Lower Quatsino limestone has been recrystallized to medium to fine grained white to off- white, and very light grey calcite marble. Numerous stylolites both oxidized and unoxidized are present, and in some areas some iron oxide is present on surface fractrures.

In 2001, sampling of the marble returned a brightness of 88 to 94.5, tint values less than 2.6 and acid insoluables ranging from 0.26 to 1.16 per cent (Assessment Report 26652).