The Warsaw Mountain occurrence is located on the southeast spur of Warsaw Mountain and is one of several kyanite occurrences within a 9 kilometre radius from Warsaw Mountain. Most occurrences occur along a northwest trending belt extending northwestly from Warsaw Mountain along Fred Laing Ridge to the confluence of Potlatch Creek with McNaughton Lake and southeastward through the head waters of Yellow Creek.

The area is underlain primarily by metasedimentary rocks of the Hadrynian Horsethief Creek Group. Three phases of intense folding have been recognized and have been affected by Barrovian metamorphism ranging from the garnet zone to the sillimanite zone of amphibolite grade. Phase 1 and 2 of folding are characterized by very tight to isoclinal folds with narrow hinge zones. A penetrative, axial planar schistosity is associated with them. In areas of higher metamorphic grade, migmatite and pegmatite constitute 10 to 30 per cent by volume of the rocks. Phase 3 folding is unevenly distributed thoughout the area. Folds generally have southwest dipping axial surfaces and a steeply dipping crenulation cleavage associated with them. Temperatures of metamorphism have been established between 540 and 585 degrees celcius and pressures between 5 and 8 kilobars (Geological Survey of Canada Paper 77-1C). Upper amphibolite facies metamorphic conditions were reached in the northern Monashee Mountains at circa 100 Ma (Geology Vol. 18, pp. 103-106).

In the Warsaw Mountain area kyanite is present in localized pelitic horizons near the base of the Semipelite-Amphibolite division (Geological Society of America Memoir 153), the Aluminous Pelite unit (Open File 1988-26) or Lower Pelite unit (Geological Survey of Canada Open File 2324) of the Horsethief Creek Group. Kyanite is rare in the Northern Semipelite unit (Mitchell, 1976), but when found, porphyroblasts in this horizon are abundant and up to 5 centimetres in length. A prominent kyanite-rich zone is located 400 metres north of the Northern Semipelite unit-Pelite unit contact. This zone is up to 30 metres wide and can be traces along strike for over 3 kilometres (Mitchell, 1976). Kyanite at the Yellow Creek (083D 007) showing may occur along the southern extension of this zone. Elsewhere in the Northern Semipelite unit (Mitchell, 1976), kyanite is found in abundance at the head waters of Potlatch Creek (083D 021) and on the ridge northeast of Potlatch Creek. Kyanite also occurs disseminated throughout the Pelite unit (Mitchell, 1976). Individual crystals are generally less than one centimetre long.