The Roy occurrence is located on the north east side of Indian River near Roy Creek, approximately 2.3 kilometres south of Clarion Lake and at an elevation of 600 metres.

The area is underlain by an elongate, northeast- trending, stock of phyllic-propylitic altered porphyritic quartz diorite, which intrudes a sequence of rhyolite and dacitic to andesitic pyroclastics. The volcanic rocks are part of the Lower Cretaceous Gambier Group and occur at the south end of a roof pendant. The pendant is enclosed in Late Jurassic diorite and quartz diorite of the Jurassic to Tertiary Coast Plutonic Complex. The stock is exposed over a 900 by 400 metre area.

Locally, a mineralized zone is developed in chlorite- altered dacitic lapilli tuffs and tuff breccias ("greenstone"). These occur within a sequence of rhyolite and dacitic to andesitic pyroclastics of the Upper Jurassic to Lower Cretaceous Gambier Group. The sequence lies near the south end of the Indian River roof pendant, which occurs within Late Jurassic diorite and quartz diorite of the Jurassic to Tertiary Coast Plutonic Complex.

The mineralized zone contains massive chalcopyrite stringers, up to 12 centimetres wide, disseminated chalcopyrite and pyrite in a matrix of black chlorite, disrupted quartz veins, and brecciated wall rock. Chalcopyrite-rich mineralization occurs over widths of up to 0.5 metres. The zone strikes 140 degrees for at least 90 metres and dips 25 degrees south west. Mineralization becomes more intense over a 214 metre area where the zone is cut by a dike striking perpendicular to the zone. The mineralization consists of chalcopyrite, pyrite, and minor sphalerite occurring as blebs up to 7 centimetres in diameter. In the general vicinity, silicified fracture zones in greenstone (chloritized rhyolite) are, locally, weakly mineralized with pyrite and occasionally chalcopyrite.

A chip sample taken along 2.4 metres assayed trace gold, 54.8 grams per tonne silver and 12.4 per cent copper (Minister of Mines Annual Report 1916, p. 368).

In 1919, drilling from the Roy No.3 tunnel is reported to have intersected a pyritized granodiorite yielding 0.5 per cent copper towards the end of the hole (Paul A. Lindberg [1975-09-29]: Geological Mapping and Economic Appraisal of the Indian River Section of the Britannia Claims).

In 1975, a sample (IRA 34) from the main trench assayed 27.8 per cent copper, 90.5 grams per tonne silver and 0.69 gram per tonne gold over 1.2 metres (Assessment Report 36023).

In 1984, a grab sample (13817) of massive sulphides assayed 89.5 grams per tonne silver, 15.5 per cent copper and 0.17 gram per tonne gold (Tom Heah [1984-12-01]: Geology and Geochemistry of the London Group Indian River, B. C. Rept. #144-016-84). Sampling by Anaconda, the same year, yielded up to 0.2 gram per tonne gold, 107 grams per tonne silver and 22.3 per cent copper (Sample RSC-C; CDN Resource Laboratories Ltd. [1984-09-10]: Assay Reports - 1984 - Falconbridge Copper - Anaconda).

The area has been explored since the early 1900’s and later on by Britannia Mining and Smelting. Exploration work is reported to have consisted of three short adits or tunnels and a number of open cuts. In 1962, Anaconda acquired the claims. The area was drilled by Anaconda in 1965, 1980 and 1981. In 1984, Falconbridge Copper entered into an option agreement with Anaconda Canada and conducted programs of geological mapping and sampling on the area. The following year, a single drill hole, totalling 328 metres, was completed. During 1985 through 1989, Minnova and Fleck Resources completed programs of geological mapping, rock sampling, electromagnetic surveys and six diamond drill holes, totalling 1500 metres, on the area as part of the Fleck Option. This work concluded that the surface alteration and mineralization represented the erosional remnant of an overlying massive sulphide deposit. In 2015, NEK Canada Mining Group completed a program of rock sampling and geological mapping on the area.