The U occurrence is located about 13 kilometres west of the Rainbow Lakes and 80 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, consists in this region of undivided black, calcareous shale, slate, phyllitic shale, minor limestone, siltstone, and pebble conglomerate. The Devonian to Permian unit consists of mafic to felsic volcanics, tuff, chert, phyllite, argillite, schist and limestone. This unit is thought to be part of the Quesnel Terrane but this assignment is uncertain (Geological Survey of Canada Open File 2779).

In 1980, DuPont of Canada Exploration Limited spent several days on their U claims conducting prospecting and soil and stream sediment sampling. During this time, a banded iron formation was discovered just south of the contact in an area of mainly greenstone. This unit also contains areas of rhyolite, basalt, quartzite and graphitic and pyritic banded chert. Rocks north of the fault contact (Road River rocks) are described as black phyllitic slate.

The banded iron formation is a small lenticular body with a maximum width of 1 metre and a traceable length of about 50 metres. Magnetite and quartz occur as interbedded laminations. Several small lenses of rhyolite occur nearby. Float near the contact was found to contain galena in association with quartz-carbonate veining in highly sericitized rock.