The Flat occurrence is located approximately 75 kilometres east of Dease Lake.

The showing occurs near the faulted contact of the Ordovician to Mississippian Road River Group, on the north, and a Devonian to Permian unnamed unit, on the south. The Road River Group, part of Ancestral North America, in this area consists of undivided black, calcareous shale, slate, phyllitic shale, minor limestone, siltstone, and pebble conglomerate. The unnamed unit consists of mafic to felsic volcanics, tuff, chert, phyllite, argillite, schist and limestone. This unit may be part of the Quesnel Terrane but this assignment is uncertain (Geological Survey of Canada Open File 2779).

In 1989, Placer Dome conducted a program of heavy mineral, rock and silt sampling on the Flat claims. Two rock samples collected assayed 0.225 and 1.595 grams per tonne gold (Assessment Report 20118). Both samples were taken from the same felsic outcrop, either a rhyolite dike or a lens of metasediments. The hostrock consisted of quartz, sericite and pyrite, suggesting that the rock may have been hydrothermally altered.