The Mile 83 sedimentary kaolin showing is located approximately 111 kilometres east-southeast of the town of Prince George and 82 kilometres northwest of McBride. The showing is 9 kilometres northeast of Highway 16 on the northeast side of the Fraser River, in the Cariboo Mining Division.

The region is characterized by early Paleozoic rocks that have been complexly folded and thrust faulted, and then in turn overprinted by later normal faulting. The showing is hosted in the McNaughton Formation (Gog Group), generally characterized by quartzites and quartz arenites.

Locally, blue plastic clays occur along the CNR tracks north of the Fraser River. The clays burn salmon and are suitable for common brick.