On the southwest face of Pinchi Mountain, Late Permian serpentinized and steatized peridotites of the Trembleur Intrusions are in contact along the Pinchi fault with blue-grey limestones and quartzitic sediments of the Mississippian to Triassic Cache Creek Group.

Magnesite occurs as 0.3 to 1.2 metre wide veins and/or as small lenses or irregular masses of magnesian carbonate veined by cherty quartz. This magnesite is best exposed on the cliff face on Pinchi Mountain and the ankeritic carbonate alteration contains about 56.4 per cent MgCO3, 16.1 per cent CaCO3, 16.2 per cent FeCO3 and about 12 per cent insolubles which are mainly silica (Open File 1987-13 p. 40). The magnesite probably originated as alteration of the serpentinites along the Pinchi fault.

In 2011, Nanton Nickel Corporation completed an exploration program including an airborne helicopter geophysical survey, reconnaissance mapping, prospecting and geochemical sampling over the property containing the occurrence. Four major, magnetic high anomalies were noted on the property. Noted rock sample MRR-21 located approximately 1 kilometre south of the occurrence graded 0.13 nickel (Assessment Report 32715).

In 2012, Nanton Nickel Corporation completed an exploration program including ground mapping, prospecting, soil and rock geochemical sampling and a petrographic study. Rock and soil sampling was not completed on the area immediately surrounding the occurrence. Anomalous rock sampling was noted in an area northwest of the occurrence.