The Stirrup Creek placer occurrence is located along Stirrup Creek, from its junction with Watson Bar Creek, northwest to its headwaters in the Camelsfoot Range.

The area is underlain by marine sedimentary rocks of the Lower Cretaceous Jackass Mountain Group, which have been intruded by sills and dikes of Tertiary to Cretaceous feldspar porphyry and quartz porphyry. The Jackass Mountain Group consists of conglomerate, siltstone and sandstone, generally trending to the north or northeast and dipping to the west.

Placer gold was discovered on Stirrup Creek in 1916, and during the next 25 years is reported have produced from 70.7 to 155.5 kilograms of gold (Assessment Report 12786). The placer gold is reported to have a median size of 2 to 4 millimetres to cube- shaped grains on the order of 4 to 6 millimetres in size and a fineness of greater than 920 (Assessment Report 12786).

In 1994, four 0.038-cubic metre surface bulk samples were collected and yielded values from 0.039 to 3.02 grams of gold per cubic metre (Assessment Report 23954).