The Bullion occurrence is located at about 760 metres elevation, 2.5 kilometres southeast of Olalla, British Columbia. The occurrence consists of three main adits and other workings located on or near the Bullion No. 1 (Lot 3116) and Nelly No. 1 Crown grants and the Bullion Fraction (Lot 3450) Reverted Crown grant. The Yellow Jacket Fraction claim was also part of this claim group in 1928. The occurrence comprises part of the Olalla Gold Camp.
In 1934, the property was explored by three main adits; the No. 1 at 762 metres, the No. 2 at 762 metres and the No. 3 at 617 metres elevation. The Nos. 1 and 2 adits are on the Bullion Fraction Crown grant and the No. 3 adit is on the Nelly No. 1 Crown Grant. The most significant gold-bearing skarn mineralization was discovered in the No. 1 adit. The No. 2 adit did not intersect significant mineralization and No. 3 was not driven far enough to intersect the mineralized zone. The West Tunnel is located 200 metres west of the No. 1 adit at about 700 metres elevation. During the period between 1980 and 1990, the area has been explored by G. Crooker. Exploration consisted of prospecting, geological mapping, geochemical sampling and geophysical surveys. Several skarn zones, shear zones, and narrow quartz veins hosting anomalous gold and silver values, were found.
The Bullion showing is located near the ultramafic to alkaline Middle Jurassic Olalla intrusion. This intrusion has intruded a sequence of oceanic sediments and volcanics of the Carboniferous to Triassic Shoemaker Formation and Old Tom Formation. Black to green chert, light grey quartzite and minor limestone lenses comprise the dominant lithologies. The Shoemaker and Old Tom formations form a broadly folded, east-dipping sequence in the area. It consists of five major lithologies: massive and bedded chert, greenstone, chert breccia, argillite and limestone. The Olalla intrusion consists of a magnetite-bearing pyroxenite peripheral zone to a diorite and syenite core. The pyroxenite is composed primarily of augite with lesser magnetite. Biotite alteration occurs within the pyroxenite. The syenite is fine grained, light grey to buff to pink. Coarse grained syenite dikes occur at the contact with the peripheral pyroxenite zone. Metasomatic deposits have formed along the contact of the Olalla intrusion with Shoemaker sediments. Mineralization is related to skarns, shearing and quartz veining. Mineralization consists mainly of auriferous and argentiferous pyrite and pyrrhotite with minor chalcopyrite, malachite, azurite and tetrahedrite.
The Bullion occurrence contains quartz veins, brecciation and skarn mineralization. The most significant gold values are associated with skarn. Skarn mineralization is developed near the contact between diorite and limestone and limy sediments of the Shoemaker Formation. The most significant skarn mineralization occurs near the No. 1 adit, where numerous workings have exposed garnet skarns mineralization with pyrite, pyrrhotite, magnetite and chalcopyrite. Up to 102.86 grams per tonne gold and 23.99 grams per tonne silver are reported over 1.4 metres (Assessment Report 22256). Other significant intersections include two taken by Friday Mines Ltd. in 1962. The first 0.91-metre intersection yielded 30.17 grams per tonne gold and the second 0.99-metre intersection yielded 10.97 grams per tonne gold (Assessment Report 22256). In 1928, an emerald green nickel carbonate, possibly zaratite, was observed in fractures (Minister of Mines Annual Report 1928, page 261). However, samples yielded less than 1 per cent nickel.
In 1990, exploration around the West tunnel by G. Crooker revealed considerable skarn mineralization near the portal. Weak to moderate silicification also occurs within the skarn but mineralization is sparse. A large opencut about 50 metres south also showed skarn mineralization. Sampling from the West tunnel in 1934 yielded 1.37 grams per tonne gold and 11.66 grams per tonne silver over 1.07 metres of skarn mineralization (Assessment Report 22256).
It was reported that a shipment of copper was made around 1926, but no official records were found (Minister of Mines Annual Report 1928, page 261).
