The Expo 8 occurrence is located on the north side of a ridge separating Whiteman and Bouleau creeks, approximately 3 kilometres west-northwest of the creek’s junction.

Regionally the area is underlain by volcanics, mudstone, siltstone, shale and fine clastic sedimentary rocks of the Devonian to Triassic Harper Ranch and(?) Nicola groups, which are intruded by Middle Jurassic granitic rocks of the informally named Terrace Creek batholith. Eocene Coryell quartz latite porphyry to syenite plugs and dikes intrude the igneous and sedimentary rocks, and volcanic rocks of the Eocene Penticton and Kamloops groups overlie them.

Locally, a potassic-altered granite and orthoclase feldspar porphyry host quartz veins with gold and silver values.

In 1987, a float sample (53621) containing visible gold assayed 2.0 grams per tonne gold and 17.6 grams per tonne silver, whereas the following year rock samples (53622) of barren-looking quartz veins yielded up to 42.1 grams per tonne silver (Assessment Report 17882).

During 1986 through 1989, Pacific Northwest Resources Inc. completed programs of prospecting; silt, soil and rock sampling; geological mapping and ground electromagnetic surveys on the area as the Expo 7 and 8 claims. Also in 1988, Chevron Minerals Ltd. completed a program of soil sampling and a 27.0 line-kilometre ground electromagnetic (VLF) survey on the area immediately northwest as the Boul 2-3 claims.

During 2014 through 2016, the area was held and explored by Ximen Mining Corp. as the Brett Gold property and a complete summary of exploration work can be found at the Brett (MINFILE 082LSW110) occurrence.