The Brooke showing, is located 4.6 kilometres southwest of the Pillar, south of Jock Creek, and 7.0 kilometres east-northeast of the Shasta occurrence (094E 050) (Assessment Report 16804). Smithers is 280 kilometres to the south.

The showing is situated within a Mesozoic volcanic arc assemblage which lies along the eastern margin of the Intermontane Belt, a northwest-trending belt of Paleozoic to Tertiary sediments, volcanics and intrusions bounded to the east by the Omineca Belt and to the west and southwest by the Sustut and Bowser basins.

Permian Asitka Group crystalline limestones are the oldest rocks exposed in the region. They are commonly in thrust contact with Upper Triassic Takla Group andesite flows and pyroclastic rocks. These Takla rocks have been intruded by plutons and other bodies of the mainly granodiorite to quartz monzonite Early Jurassic Black Lake Suite and are in turn unconformably overlain by or faulted against Lower Jurassic calcalkaline volcanics of the Toodoggone Formation, Hazelton Group.

The dominant structures in the area are steeply dipping faults which define a prominent regional northwest structural fabric trending 140 to 170 degrees. In turn, high angle, northeast-striking faults (approximately 060 degrees) appear to truncate and displace northwest-striking faults. Collectively these faults form a boundary for variably rotated and tilted blocks underlain by monoclinal strata.

The Brooke showing is hosted within a northwest trending, lens-shaped, Early Jurassic, equigranular biotite, hornblende granodiorite to quartz monzonite and rare diorite stock of the Black Lake Suite (Bulletin 86). The oldest rocks underlying the Brooke showing appear to be equigranular, holocrystalline quartz monzonite with goethite staining where magnetite has been oxidized on fracture surfaces. This is intruded by syenite and syenite porphyry dikes. Both these units are intruded by a potassium feldspar-epidote, latite porphyry. The showing proper is hosted in undifferentiated syenite and syenite porphyry rocks.

The Brooke showing consists of chalcopyrite, pyrite, quartz and barite within and adjacent to a gossan developed along the subhorizontal contact between the stock and volcanics and associated intrusives of the Toodoggone Formation. Malachite and azurite staining are present.

Assay results from sample KX26519 were 3.74 grams per tonne silver, 0.034 gram per tonne gold, 1.50 per cent copper and 0.275 per cent zinc (Assessment Report 3987). In 1987, sampling 500 metres south-southwest along the same ridge where the above sample was taken, yielded additional anomalous results. Sample 106087 analysed 6.8 grams per tonne silver, 0.305 gram per tonne gold, 0.032 per cent copper, 0.020 per cent zinc and 0.012 per cent lead (Assessment Report 16804).

In 2004, a rock sample (TD 94) of andesite with barite veins and malachite, taken from a road cut located approximately 700 metres to the northeast, assayed 4.9 grams per tonne silver and 0.326 per cent copper (Assessment Report 27602).

Work History

In 1969, Cominco Ltd. completed a program of geological mapping and geochemical (rock, silt and soil) sampling on the area as the Theban claims.

In 1971 and 1972, Kennco Explorations Ltd. completed programs of geological mapping and geochemical (rock, silt and soil) sampling program on the area as the Black claims.

In 1980 and 1981, Serem Ltd. completed programs of prospecting, geological mapping and geochemical (rock, silt and soil) sampling on the area as the OJ, Orange, Arg and Argus claims.

During 1985 through 1987, Rhyolite Resources Inc. completed programs of geological mapping, trenching, geochemical (heavy mineral, rock and soil) sampling and a 200 line-kilometre airborne geophysical survey on the Adrian, Argus, Ian, Otto and Paul claims. Also in 1987, Beachview Resources Ltd. prospected and sampled (rock and soil) the area as the Brooke and Lee claims. In 1988, Rhyolite Resources completed a further program of rock and soil sampling, geological mapping and a 7.2 line-kilometre induced polarization survey on the Ian, Otto, Adrian, Paul and Argus claims. In 1990, Rhyolite conducted a soil geochemical sampling program to extend the coverage of an existing survey grid and to explore a new area within the claim group.

In 1992, Electrum Resources completed a program of heavy mineral sampling on the area as the Pil 1-3 claims. The following year, the Pil claims were expanded and a further program of prospecting and geochemical (heavy mineral, rock and silt) sampling was completed. In 1995, Electrum Resources completed a program of rock and soil sampling and a 9.7 line-kilometre ground magnetic survey on the Pil claims. In 1996, a minor prospecting and sampling program was completed along with LANDSAT TM and Radar imagery review. In 1997, a further program of rock and soil sampling and 28.7 line-kilometres of ground geophysical surveys were completed on the Pil claims. In 1998, Electrum Resource completed a program of geological mapping, geochemical (rock, silt and soil) sampling and a 4.9 line-kilometre ground magnetic survey on the Pil claims.

In 1999, Finlay Minerals purchased the Pil property and conducted a major exploration effort including induced polarization and magnetic surveys, geochemical (soil and rock) sampling and detailed geological mapping. During 2001 through 2007, Finlay Minerals completed further programs of geological mapping, geochemical sampling, trenching, diamond drilling and geophysical surveys on the Pil property. A complete summary of this work can be found in the Pil South (MINFILE 094E 310) occurrence.

In 2015, Finlay Minerals completed a program of geological mapping and geochemical (rock and soil) sampling on the Pil claims.