The general area of the occurrence is given as the exact locality of Olivine Mountain (Camsell, 1911).

The dunite-rich core of the Tulameen Ultramafic Complex, a zoned Alaskan-type intrusive complex contains outcrops over an elongate area extending from Grasshopper Mountain up the northwest slope of Olivine Mountain to its summit. Chromite frequently occurs as clusters of disseminated coarse crystals, particularly in areas of intense serpentinization within the dunite. The mineral also forms small blebs, minute veinlets, massive pods and lenses up to 100 by 6 centimetres in size within the dunite and is associated with lesser magnetite. These are scattered randomly throughout the dunite, not occurring in any significant concentrations.

Four thin sections made from chromite-rich serpentines carried diamonds in veinlets of serpentine and hornblende, visible under a microscope (Camsell, 1911). The general appearance of the diamonds is given as brownish to yellowish in colour, partly or wholly opaque and having a spherical or quite irregular outline. Their size is described as being about the size of an ordinary pin's head.