The McQuillan Creek showing is located 17 kilometres southeast of Port Alberni on McQuillan Creek.

The area is underlain by volcanic rocks of the Devonian Duck Lake Formation, Sicker Group which have been intruded by Late Eocene Mount Washington Intrusive Suite rocks to the south. The rocks comprise hematitic jasper, basalt flows, hematitic basalt breccia, feldspar porphyry basalt intrusives, basalt and tuff.

Locally, hematitic jasper is exposed in a 1.7 metre wide by 15 metre long outcrop, trending approximately 155 degrees. The jasper consists of 75 to 90 per cent bright brick-red jasper with 10 to 20 per cent interstitial clear quartz containing about 5 to 10 per cent very fine- grained disseminated hematite. Irregular hematite-filled fractures, up to 2 centimetres thick, crosscut the jasper. Locally the jasper contains massive hematite bands, 0.5 to 1.5 metres thick.

In 1984 and 1985, Nexus Resources completed programs of prospecting and geochemical sampling. In 1986, Hollycroft Resources completed a program of geological mapping, prospecting and geochemical sampling on the McQuillan claim. A sample from the outcrop assayed low values for copper, zinc, silver and gold (Assessment Report 14880).

From 1999 through 2002, Mandalay Resources completed programs of prospecting and rock and soil geochemical surveys on the King claims. In 1999, a long grab sample of mineralized outcrop, from the area of the McQuillan Creek occurrence, assayed 5720 parts per billion gold, 92 parts per million copper and 185 parts per million lead (Assessment Report 26086).

An outcrop of jasper somewhere along the creek, occurring between a large bed of argillaceous schist and crystalline rock and containing abundant hematite, was noted in the Minister of Mines Annual Report 1895. This is possibly the same outcrop.