The Gorge Creek occurrence is located 1 kilometre south- southeast from the Mica Dam on McNaughton Lake. The area is underlain primarily by folded metasedimentary rocks of the Hadrynian Horsethief Creek Group. The regional foliation in the area strikes 083 degrees and dips 44 degrees. Upper amphibolite facies metamorphic conditions were reached in the northern Monashee Mountains at circa 100 Ma (Geology Vol. 18, pp. 103-106). An expanded description of the regional geology is given in the Warsaw Mountain showing (083D 041).

In the Warsaw Mountain area, northern Selkirk Mountains, 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) and the Lower Pelite unit (Geological Survey of Canada Open File 2324) of the Horsethief Creek Group are more recent divisions correlative with the Semipelite-Amphibolite division. This unit consists of pelitic schist (locally kyanite, sillimanite, staurolite, garnet, biotite and/or muscovite-bearing), quartzofeldspathic psammite, conglomerate with clasts of marble, calcsilicate rock, quartzite and granite, and concordant and discordant amphibolite. Kyanite porphyroblasts in these horizons are up to 5 centimetres in length.