Elevation: 5,866 feet
Type: Gold, Silver
The Liberty Gem mine is 8.5 miles southwest of Hailey, and about one-half a mile northeast of the junction of Kelly Gulch and Croy Creek. The property comprises 22 unpatented claims, owned by the National Milling and Mining Corporation. There are several exploration workings on the property, but development has been principally by two shafts; the Bernie, 230 feet deep; and the Main shaft, 210 feet deep. Both shafts are now caved at the surface. The deposits were discovered in 1927 by Newton Mathews and have been worked intermittently since that time.
Three veins are reported to occur on the property, although only one was examined. This vein is exposed in an open pit a few feet from the Main shaft. It is 30 inches thick, strikes N. 15° W. and dips 48° SW. The vein is essentially a shear zone containing irregular masses of lead ore distributed throughout the fault gouge.
The country rock is part of the Wood River formation, although it is reported (13) that on the 100-foot level from the Main shaft the vein passed into granitic rock, presumably a part of the large granitic mass outcropping nearby to the southwest in the Hailey Gold Belt area.
In 1939 a shipment of crude ore from the property assayed .015 ounce of gold per ton, 18.4 ounces of silver per ton, 18.9 per cent lead, and 3.3 per cent zinc. The production record of the mine was not obtained but it is believed to be small.
Source: Detailed Geology of Certain Areas in the Mineral Hill and Warm Springs Districts, Blain County Idaho. Idaho Bureau of Mines and Geology, 1950