The John Bull (Evening Star, W.B. Marks) occurrence is reportedly located immediately below the first main fork of Jim Kelly Creek, approximately 5.6 kilometres from its junction with the Tulameen River

The area is underlain by sediments of the Lower to Upper Cretaceous Pasayten Group, which are composed of altered, fractured and fissured sandstone, conglomerate and pelite. These are intruded by foliated diorite of the late Jurassic and early Cretaceous Eagle Plutonic Complex, composed of a mass of foliated granodiorite. To the north of the showing, the upper Oligocene–lower Miocene Coquihalla Formation, composed of basalt, rhyolite, tuff and agglomerate, caps Coquihalla Mountain.

The showing consists of a small quartz vein that strikes 165 degrees and dips 50 degrees west. The vein is developed by a 6.1-metre open-cut and a tunnel extending 7.6 metres along the vein. The vein ranges from 15 to 25 centimetres in width, and has several parallel stringers, which traverse the rock adjacent to the vein. The mineralized main quartz vein hosts pyrite and chalcopyrite.

Another mineralized vein is reported approximately 400 metres west of the main occurrence. The vein consists of quartz with pyrite and minor chalcopyrite in a silicified and sheared greenstone.

In 1913, a sample, taken across 20 centimetres, assayed 24.0 grams per tonne gold and 17.1 grams per tonne silver. A high-grade sample yielded 48.0 grams per tonne gold (Minister of Mines Annual Report 1913, page 233).

In 1937, an 18-centimetre wide sample assayed 9.6 grams per tonne gold and 3.43 grams per tonne silver (Minister of Mines Annual Report 1937, pages D21,D22).

In 1984, silicification and pyritization were found to be associated with east-trending faults. A major fault of this nature was found along the western boundary of the claim. Ten samples were taken from the pyritized areas and assayed between 0.34 and 1.71 grams per tonne silver and 0.034 gram per tonne gold (Assessment Report 13829).

The area has been explored since the late 1890’s. In 1909, copper-gold ore was reportedly removed by James Kelly but the exact location of this is unknown. In 1914, the John Bull, Spokane, Vancouver, Marsellaise, Superior and Gold Mountain groups were explored. In 1926, exploration was done on the Silver Bell and Belmont claims, thought to be the same vein as previously worked by James Kelly. In 1937, the Evening Star group was worked by W.B. Marks.

During 1982 through 1985, Minequest Exploration completed programs of prospecting and soil sampling the area as the Aura claims. In 1989, T.M. Parsons prospected and sampled the area as the Fortune and Great Scott claims.