Placer workings along Antoine Creek are located about 14 kilometres northwest of Horsefly. Bedrock geology comprises sediments and basalts of the Middle-Upper Triassic Nicola Group.

The Antoine Creek deposit consists of Cenozoic unconsolidated sediments. Pay gravel is locally cemented by calcite. The original pay horizon was a 1.0 metre thick gravel horizon on top of a red clay layer. The horizon was worked by a series of shallow shafts and drifts at the head of Antoine Creek. Slightly downstream, several small hydraulic pits were made. The gravels were recorded as paying $0.50 per cubic yard, or about 0.43 gram per tonne. The site was worked for the period 1929 to 1933 by R.N. Campbell and several associates. Only a small amount of gold was produced (6479 grams) which is consistent with the small size of the operation. Recorded production of 5878 grams of gold between the years 1926 to 1935 is probably less than the total produced (Bulletin 28, page 50).

"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).