The Oro occurrence is located on Crown grant Lot 2434 at 1448 metres elevation above sea level, in the Slocan Mining Division. The claim is on the north side of Carpenter Creek, just east of Cody Creek.

Regionally, the area lies on the western margin of the Kootenay Arc, in allochthonous rocks of the Quesnel Terrane. In the vicinity of the occurrence, the Quesnel Terrane is dominated by the Upper Triassic Slocan Group, a thick sequence of deformed and metamorphosed shale, argillite, siltstone, quartzite and minor limestone. Rocks of the Slocan Group are tightly and disharmonically folded. Early minor folds are tight to isoclinal with moderate east plunging, southeast inclined axial planes and younger folds are open, southwest plunging with subhorizontal axial planes. The sedimentary sequence has been regionally metamorphosed to lower greenschist facies.

South of the occurrence, the Slocan Group has been intruded by the Middle Jurassic Nelson intrusions which comprise at least six texturally and compositionally distinct phases ranging from diorite to lamprophyre. The most dominant phase is a medium to coarse grained potassium feldspar porphyritic granite. Several feldspar porphyritic granodiorite dikes, apparently related to the Nelson intrusions, also cut the sedimentary sequence near the occurrence (Paper 1989-5).

The Oro property is underlain by argillite of the Slocan Group and a large quartz porphyritic dike probably related to the Nelson intrusions. An adit has been driven on a northwest-trending shear that dips 55 degrees southwest. The shear varies from a few centimetres up to 0.6 metre in width. It is filled with crushed rock, gouge and quartz which is sparingly mineralized with sulphide minerals (probably galena and sphalerite).

In 1927, seven tonnes of ore were mined from the adit to produce 7278 grams of silver, 527 kilograms of lead and 113 kilograms of zinc.