 Precipitation runoff from the peak drains into Joffre Creek and Twin One Creek, both tributaries of the Lillooet River.The first ascent of the mountain was made on August 18, 1957, by Dick Chambers, Joe Hutton, Roy Mason, Paddy Sherman, and Cyril Scott, who were members of the British Columbia Mountaineering Club.The mountain's name honors Tom Matier, an early well-known prospector in the area.