Geology of the property is lower Paleozoic limestones and sediments in the Antler orogenic belt that have been dislocated by the Roberts Mountain Thrust. These rocks were intruded by Mesozoic granites and then covered by Tertiary volcanics.
The first recorded production of gold, silver, copper, lead and zinc from the Diamond Jim lode deposit was in 1934. The deposits were not mined intensively until the 1950s, and the district was a steady producer of lead, silver, zinc and copper until the 1970s. Exploration activity for lode precious-metal deposits centered on the Diamond Jim area in the 1970s, when an extensive program of geologic mapping, geochemical sampling and minor drilling was performed by Columbus Mines, Inc. for Gold Creek Silver Mines, Inc., the past owner of the property. This work resulted in recognition of a greater extent of the mineralized zones than was previously known, and some gold production was recorded for the mine in the 1970s and 1980s.
From 1979 to 1981, Gold Creek Silver Mining Co. shipped 353 tons of ore averaging 39.08 opt silver, 0.05 opt gold, 28.82% lead, and 0.93% zinc.
Modern exploration was conducted in the 1980s and 2000s most significantly by Columbus Mines Inc. who surveyed and sampled the underground workings of the Diamond Jim. Later, Mason Exploration Associates Ltd. with Golden Hope Mines Ltd. collected rock samples at the Diamond Jim and drilled at the St. Elmo. In 2003 Argosy Minerals Inc. collected rock samples and planned to conduct drilling but the drilling was canceled before implementation.