The Mount Rose showing is located 6 kilometres west of Armstrong, southwest of the summit of Mount Rose.

In this area, sedimentary and volcanic rocks of the Upper Triassic to Lower Jurassic Nicola Group are in fault contact to the north with Cambrian-Ordovician volcanic (Tsalkom Formation) and sedimentary (Sicamous Formations) rocks. To the south, the Nicola Group is in probable unconformable contact with Devonian to Triassic sedimentary and volcanic rocks of the Harper Ranch Group. Cretaceous granitic plugs of the Salmon Arm Intrusions intrude the Nicola, Sicamous and Tsalkom rocks. Outliers of Eocene Kamloops Group volcanic rocks are present.

Cretaceous quartz diorite hosts a large quartz vein (the Ivan vein) which has been mined for industrial use. The quartz is massive, milky white and is cut off by a fault to the northeast. The vein is about 12 metres thick, is exposed for 75 metres along strike and averages 30 metres in plan width. Minor impurities including sparse disseminations of galena, chalcopyrite, pyrite, pyrrhotite and limonite occur near the hangingwall and the fault. Limonitic fractures are also present near the fault. Fractures 3 to 15 centimetres apart are common. The analysis of a random sample of loose muck from the quarry returned 99.56 per cent silica (Minister of Mines Annual Report 1969, page 407).

Between 1968-75, the Mount Rose Mining Co. produced about 5034 tonnes for stucco dash, exposed aggregate and metallurgical use.