The Silver Spray occurrence is located 3.5 kilometres southeast of Toby Creek in the Golden Mining Division. The occurrence is between Coppercrown and Stark creeks on the north face of Coppercrown Mountain.

The area is underlain by Proterozoic clastic sedimentary rocks and Cretaceous intrusive rocks. The occurrence is within the Dutch Creek Formation of the Proterozoic Purcell Supergroup. The Purcell Supergroup strata include the Aldridge, Creston, Kitchener, Dutch Creek and Mount Nelson formations (Paper 1990-1).

In the vicinity of the occurrence, rocks of the Kitchener and Dutch Creek formations have been further subdivided and assigned to the Van Creek and Gateway formations (Open File 1990-26).

The Dutch Creek Formation includes green and black laminated argillite, quartzite, siltstone and buff dolomitic siltstone. The Van Creek Formation consists mainly of coarse to medium grained, light grey to dark green quartzite, siltstone and silty argillite and correlates with the strata of the Lower Kitchener Formation.

The Gateway Formation consists of an interbedded sequence of quartzite, green siltstone and buff dolomite that correlates with the lower portion of the Dutch Creek Formation. The contact with the underlying Van Creek Formation is gradational or marked by the basaltic flows of the Nicol Creek Formation.

The sedimentary rocks have undergone regional metamorphism to at least greenschist facies.

The Silver Spray occurrence is within the upper Hg2 member of the Gateway Formation immediately below the contact with the unconformably overlying Dutch Creek Formation in the crest of an anticline parasitic to the major Coppercrown anticline (Open File 1990-26).

Mineralization consists of galena, tetrahedrite and cerussite with minor sphalerite and malachite in vertical and bedding-parallel fractures in the order of 5 to 20 centimetres wide (Minster of Mines Annual Report 1926).