The Casino Red Cap occurrence is located southwest of the Columbia River and northwest of Casino Creek at an elevation of approximately 640 metres on the lower slopes of an east-facing slope.
Regionally, the area is underlain by basaltic volcanic rocks and sediments of the Lower Jurassic Elise Formation (Rossland Group), which has been intruded by quartz monzonitic rocks of the Early Jurassic Rossland Plutonic Suite, granodioritic rocks of the Middle Jurassic Nelson Batholith and granitic rocks of the Eocene Sheppard Intrusion.
Locally, a series of at least three narrow quartz vein systems occur along the north-dipping contact of a granodioritic stock of the Middle Jurassic Nelson Batholith and the Rossland meta-sediments to the southeast. The veins have a general northeast (055 degrees) strike and dip steeply (60 to 75 degrees) to the northwest, ranging in widths that average approximately 35.6 centimetres but locally vary from 15 to 100 metres. Mineralization consists of galena, sphalerite, pyrite and arsenopyrite in a gangue of quartz. Mineralized quartz is for the most part confined to the Rossland Group rocks adjacent to the contact; however, some quartz was noted in fractures in the intrusive. Numerous north-striking rhyolite dikes were mapped on the surface and underground.
In 1981, underground sampling (466-P) yielded up to 109.4 grams per tonne gold over 0.45 metre (Property File - Ainsworth Resources Limited [1981-03-25]: Report on the Casino Mine Gold Prospect Trail Creek Mining Division, Trail British Columbia).
A total of 5514 tonnes of ore were mined between 1951 to 1965, producing 81 334 grams gold, 23 949 grams silver, 6009 kilograms lead and 5982 kilograms zinc.
In 1951 the Casino Red Cap claim was owned by T.P. Voiken & Associates of Trail. The showing was developed by an opencut, 2 metres long and 2 metres deep. A crosscut adit, collared 12 metres below the outcrop, was being driven towards the vein. Nothing more was done with the property until 1957, when Messrs. Wells and Donelly began development work on a part-time basis. Two drifts, 61 metres long and 8 metres apart in elevation, were driven on the near-vertical vein. A stope, 46 metres long and 2 metres wide, was mined between the levels. A small amount of crosscutting was done on the lower level.
In 1961, the W.D. Mining Co. Ltd., consisting of five men with equal shares, operated the mine on a part-time basis. During the year, 108 metres of diamond drilling were completed. Casino Gold Mines Ltd. held an option on the property from June to September 1962. A geological survey was undertaken, and some development work done on No. 1 level; diamond drilling in five holes was done from No. 1 level. The property was then bought by Messrs. Donelly, Pompu and Ernewin and in October 1962 stoping began above No. 1 level. During the first half of 1963, approximately 30 metres of crosscut and 23 metres of raise were completed; stoping was done on No. 1 vein between No. 1 and No. 3 levels. Columbia River Mines Ltd. was formed in November 1963 to acquire the property and assets of W.D. Mining Co. Ltd. In 1964, a development program consisting of 625 metres of drifts, raises and sub-levels was started on No. 1, 2 and 3 veins.
In 1981, Ainsworth Resources examined and sampled the area. In 1988, Tobex Resources completed a program of geochemical sampling and a 113.0 line-kilometre airborne geophysical survey on the surrounding area as the AD and Gold Dust claims.
In 2010, St. Elias Mines Ltd. examined and sampled the underground workings. Samples of arsenopyrite-bearing quartz veins from pillars in the underground workings yielded from 3.75 grams per tonne gold over 0.13 metre to 12.50 grams per tonne gold over 0.80 metre and 23.10 grams per tonne gold over 0.30 metre (Assessment Report 32058).
