Concentrations of placer gold occur at different points along Terry Creek in post-glacial gravel overlying a false bedrock of kaolinized granitic material. The area is underlain by schists.

"Data from the Cariboo mining district indicate that supergene leaching of gold dispersed within massive sulphides by Tertiary deep weathering followed by Cenozoic erosion is the most likely explanation for the occurrence of coarse gold nuggets in Quaternary sediments" (Exploration in British Columbia 1989, page 147).