The Idaho-Maryland Mine property is located in Grass Valley; California, in the historic “Northern Mines District” which is one of the most famous and productive mining districts in California. The principal mines in the area include the Empire, Idaho-Maryland, North Star, Pennsylvania and W.Y.O.D. mines.
The original claim on the Idaho-Maryland Mine Property was staked in 1851 and high-grade gold mineralization was discovered in 1863. The Idaho Maryland Mine operated from 1862 until it shut down in 1956 because of the fixed price of gold at $35. USD per ounce and rising labor and supply costs. During its operation, the Idaho-Maryland Mine Property yielded 2.38 million ounces (74 million grams) of gold from 5,546,000 short tons or a recovered grade of 0.43 ounces of gold per short ton. The Idaho Maryland Mine was mined to a depth of 3,280-foot (1,000m) level. The Idaho Maryland Mine is reputed to be the second largest and second most productive underground gold mine in California history, a runner-up to the adjacent Empire Mine.
From 2002 to 2012, Idaho Maryland Mining Corporation, a subsidiary of Emgold Mining Corp., under agreement with the mine owners, conducted studies, investigations, sampling, testing, etc. at the Idaho Maryland Mine and applied to California and local regulating agencies for permission to reopen the mine. These efforts produced a Draft Environmental Impact Report, Phase 1 Environmental Report, Technical Reports, Assays and numerous other studies and data. About two thirds of the way through the regulatory process, Emgold, citing equity market conditions and funding difficulties, withdrew its application to re-open the Idaho Maryland Mine.