The Allan Creek showing is located at an elevation of 840 metres on the north side of Allan Creek, later referred to as Centennial Creek, a northern tributary of the Oktwanch River. The occurrence is approximately 27 kilometres northwest of the town of Gold River.

The area is underlain by Upper Triassic Karmutsen Formation (Vancouver Group) pillow lavas with minor interbedded limestone, which have been intruded by granodiorite of the Jurassic Island Plutonic Suite.

Locally, a small lens of 0.3 by 3.0 metres at a limestone-volcanic contact contains chalcopyrite interstitially with garnet.

2013 prospecting on the Preston property showed that chalcopyrite was found to be associated with K-feldspar, epidote ± garnet and amphiboles. The mineralization is spatially related to the contact metamorphism and metasomatism of the Karmutsen and Buttle Lake groups by the Island Plutonic Suite. Chalcopyrite is not confined to the skarnified limestone. In the north of the property the chalcopyrite is found as clots within the thick units of basaltic volcanic rock.

In 1965, Empire Development completed a program of prospecting and geological mapping on the area as part of the Nimpkish Copper property. In 1972, First National Mines completed a program of geological mapping and rock sampling on the area as the HK 1-2 claims. In 1990, the area was prospected as the Maybee A claim. In 1993, Noranda completed a program of airborne geophysical surveys on the area as part of the Muchalat property. In 1995 and 1996 the Allan Creek area was prospected, stream sampled and rock sampled by Westmin Resources Limited, operating for Doromin Resources Ltd., as part of the Dragon property.

In 1996, R.J. Lightle prospected the area. In 2011, the area was prospected as part of the Preston property. In 2012 and 2103, Santa Fe Metals Corp., on behalf of British Pacific Minerals Ltd., carried out programs of prospecting, stream sediment and rock sampling on the Preston property. The sampling of mostly metasedimentary rocks returned anomalous values of copper (ranging between 0.0002 and >1 per cent) and silver (ranging between <0.1 to 3.3 grams per tonne). The sampling was followed up by a small microdrill program to determine the extent, style and potential of copper, silver, zinc, lead mineralization at the massive sulphide lens in Campbell Creek (092E 025), approximately 800 metres northwest of the Allan Creek showing.