The Petra (B.A. Corp.) occurrence is located on the edge of and just off (west) reverted Crown grant Oyster (Lot 10228), immediately south of Liverpool Creek in the Perry Creek drainage.

The area is underlain by sedimentary rocks of the middle Creston Formation intruded at their (faulted) contact with Kitchener Formation by diorite sills of the Moyie Intrusions; all these units belong to the mid-Proterozoic Purcell Supergroup.

The showings are hosted in quartzite of the Creston Formation; microdiorite dikes are found in float in this area and are ascribed to a local source by recent work. Both these rock types belong to the mid-Proterozoic Purcell Supergroup, assuming that the microdiorite is part of the Moyie Intrusions.

Locally, several zones exposing quartz veins or quartz vein stock works, up to 70 centimetres wide, with a few narrow stringers have been identified on the Petra group. The veins are pyrite and hematite with traces of chalcopyrite and galena; anomalous zinc suggests the presence of sphalerite. Disseminated euhedral pyrite, up to several millimetres in size, is also present.

In 1979, a 0.3-metre chip sample (6263B) from quartz vein in contact with a dike assayed 3.4 grams per tonne silver and 0.5 gram per tonne gold (Assessment Report 7723). These were taken from a large quartz outcrop a few hundred metres south east of the shaft.

In 1981, a rock sample (49145) from a 2-metre wide quartz lens assayed 6.8 grams per tonne silver (Assessment Report 9850).

In 1985, a sample (66375E) from a trench yielded 4.1 grams per tonne gold (Assessment Report 14211).

In 1986, bulk soil sampling concentrates indicated highly anomalous gold values of up to 11 grams per tonne gold, whereas sampling of trenches yielded up to 3.9 grams per tonne gold over a width of 10 metres and drilling under the trench yielded 0.3 gram per tonne gold over 1.5 metres (Assessment Report 15649).

The occurrence is one of a series of sub-parallel veins, “ledges” or shears that have been historically explored as part of the Perry Creek lode gold property, which includes the Homestake (MINFILE 082FSE012), Columbia (MINFILE 082FSE009) and McIntosh (MINFILE 082FSE120) occurrences. The area has been historically explored by at least a shaft and an adit with several trenches.

In 1978, Meridian Resources completed a program of geochemical sampling and geological mapping on the area. During 1979 through 1986, Gallant Gold Mines completed programs of rock, soil and silt sampling, trenching, geological mapping, 60 metres of diamond drilling and ground electromagnetic and magnetic surveying on the area as the Perry Creek property. In 1984, Trans-Artic Explorations completed a ground electromagnetic survey on the area as the Snow claim. In 1987, Chapleau Resources completed a program of soil, silt and rock sampling, trenching and geological mapping on the area as the Racki claims, Morgan property. In 2001 and 2002, National Gold Corporation completed programs of geological mapping and rock sampling on the area immediately west as the HS and Zinger claims. Also, in 2002, Klondike Gold completed a soil sampling program on the area as the PC claims. In 2003, Chapleau Resources conducted an extensive exploration program of surface prospecting, rock and soil sampling and geological mapping on the area as the Zinger property.