The Hidden Treasure occurrence lies on the western slopes of Jubilee Mountain, 1 kilometre north of the Spillimacheen River and 8 kilometres northwest of the village of Spillimacheen on the Columbia River.

The principal work on the occurrence is an "excavation" in the side of the hill. The excavation started as an open cut and continued as a tunnel. The open cut is 12 metres high and 9 metres deep. Government records indicate that in 1895 eighteen tonnes of ore were shipped. In 1898, nine tonnes of ore were mined. From this ore 4,808 kilograms of copper were recovered. In 1916, six tonnes of ore were mined, producing 454 kilograms of copper and 10,886 grams of silver.

The region includes strata from the Purcell and Windermere supergroups, overlain by a Paleozoic platformal carbonate succession. The structure of the area is dominated by the Mount Forster-Steamboat Fault, one of a series of Mesozoic thrust faults, and it carries folded Middle and Upper Proterozoic strata over folded Upper Proterozoic and Paleozoic strata.

In Jubilee Mountain, the Middle to Upper Cambrian Jubilee Formation generally consists of a massive dolomite-limestone unit. The Upper Cambrian to Middle Ordovician McKay Group conformably overlies the Jubilee Formation and generally includes thin bedded limestones, shales and thin bedded sandstones.

At the Hidden Treasure occurrence, a limestone-slate contact is described. Chalcopyrite, galena, malachite, azurite, sphalerite and barite were observed in the Jubilee limestone, confined to a sheared zone of limestone and to "slate" of the McKay group. Copper sulphides, primarily "replacing limestone" have been converted to malachite and azurite.