The Great Glacier occurrence is an area which extends from the International Boundary, south of the Great Glacier and southeast to the valley of Craig River. The area has been described (in Geo- logic Survey of Canada Memoir 246, page 23) as crystalline schists and gneisses. The less altered schists include biotite, sericite, chlorite, and hornblende which exhibit a well developed cleavage. The more crystalline schists in the occurrence area are dominantly mica schists, with large crystals of hornblende, brown garnet, silli- manite or staurolite. Other minerals, other than the typical mica, quartz, and feldspar, include kyanite, ottrelite, actinolite, tourmaline, apatite, andalusite, and minor graphite.