Black Diablo Hill
Previously Producing Manganese District - Pershing County, Nevada
The Black Diablo Property hosts the Black Diablo Manganese Oxide Mine. Located 19 miles South of Golconda, the Black Diablo Hill property is a previously producing Manganese open pit mine. Historical documentation describes the deposit as "massive lenses of ore."
Regarding manganese oxide deposits, the USGS notes that (in the Winnemucca area) “permissive and favorable tracts coincide with those of the Cyprus massive sulphide deposits. The Mineral Resource Data System entry for the Black Diablo deposit reports a sample containing 10,000 ppm Cu. Franciscan type Manganese Oxide deposits commonly contain trace copper, suggesting that the Black Diablo is anomalous for copper. As this is an anomalously high amount of Cu for a Manganese Oxide Deposit, it may indicate the area is particularly prospective for Cyprus style VMS deposits such as the Big Mike.
In operation from approximately 1929 to 1955, Black Diablo's production was about 100,000 tons of ore which averaged 25 to 35 percent manganese, which places it in the upper 10% of historical deposit production and produced the majority of Manganese Oxide in Pershing County.