The Green Monster mine is located in the Goodsprings Mining District, NE of Sandy Valley NV, in Clark County. The Green Monster claims were first located in 1894 and were soon afterward acquired by the Hearst Estate, who still owns the property. In 1919, John Darington leased the ground and sank a winze in ore from near the southern end of the 200 level. The development was unprofitable and there is no record that any shipments were made. The property was idle until Roy Jacobson leased it in 1942. In that year two carloads of zinc ore was shipped to Coffeyville, KS. Shipments to the stockpile of the Metals reserve Company at Jean during the following 2 years amounted to 2,496.4 tons averaging about 19 percent zinc and 1 percent lead.

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