The Granite (formerly Horse) Creek showing is located south of the creek near its headwaters. The creek flows westward into the northern end of Surprise Lake, approximately 35 kilometres northeast of the community of Atlin.

The creek is located well within the Late Cretaceous Surprise Lake batholith (Surprise Lake Plutonic Suite) which covers about 1100 square kilometres northeast of Atlin. This alaskitic body has intruded into Upper Paleozoic volcanic and sedimentary rocks of the Cache Creek Complex.

This area was prospected for uranium in 1978 and geologists at that time noted traces of wolframite and some minor quartz veining within the creek bed. Minor amounts of galena were also present in outcrops south of the creek. No uranium was noted along this part of Granite Creek.