Tombstone Exploration Corporation is a mineral resource company in the exploration stage. The Company's primary focus of operations is to generate revenue from the production of silver and gold, as well as additional base minerals, such as copper, lead and zinc. As of December 31, 2015, the Company held the mineral rights to approximately 400 acres of the United States Bureau of Land Management (BLM) lode claims, which included the Stardust Mine in Yuma County Arizona, the...