The Lancaster occurrence is on the east side of Jubilee Mountain, which is on the west side of the Rocky Mountain Trench. These properties are 4 kilometres south of Harrogate and 8 kilometres northwest of Spillimacheen.

The Annual Report of 1889 records that the Lancaster claim was staked in 1887. No records of significant mineral production were found although the Annual Report for 1890 listed approximately 25 tonnes of "copper and carbonate" ore were shipped from Lancaster. In 1968, Calix Mines Limited carried out an induced polarization survey over the Crown grant claims. In 1974, Dekalb Mining Corporation conducted a drill program to locate a lead-silver-barite zone. In 1975, the corporation followed this with an electromagnetic survey and a geochemical soil survey over the claims. The following year Dekalb conducted another drilling program supplemented with gravity information. The drilling confirmed that mineralization was confined to dolomitic limestone of the Upper Jubilee Formation (Middle to Upper Cambrian) and associated with breccia zones.

In the Lancaster occurrence area, the McKay Group (Upper Cambrian to Middle Ordovician) conformably overlies the Jubilee Formation. Here, these units form the east limb of a large syncline. Disseminated galena, sphalerite, chalcopyrite and chalcocite occur in the Jubilee Formation in a breccia matrix and as small pockets of richer ore in the barite. The sulphides tend to concentrate near the contact of shale in the McKay Group. Silver is associated with the galena. The sulphide deposition is considered to be epigenetic and replacement in origin.