Bull Creek flows southwest from Mount Farnsworth to the O'Donnel River. It is about 10 kilometres long and its junction with the O'Donnel River is about 33 kilometres southeast of the community of Atlin. All work has been done near the creek junction with the O'Donnel River and has involved small, individual operations running intermittently from 1903 to 1945 and during the past 13 years. From 1936 to 1945, 1296 ounces of gold (40,309 grams) were recovered from the creek.

Bull Creek flows over primarily cherts and argillites with minor limestone of the Mississippian to Triassic Kedahda Formation of the Cache Creek Complex. There are also some exposures of mafic volcanic rocks of the upper Mississippian to Permian Nakina Formation (Cache Creek Complex) east and west of the headwaters of Bull Creek. The bedrock in the creek is composed of weathered and fractured argillite which contains some gold.

The placer stratigraphy consists of grey till overlying yellow till which overlies clean, well stratified auriferous gravels immediately above bedrock. This creek has distinctly fine gold in comparison to the main producers in the Surprise Lake area.