Tombstone Exploration Corporation announced in combination with Goldrock Resources Inc. and the Bonanza Mining Company that construction has begun on the leach pad at the Harquahala Mine in La Paz County, Arizona. The Bonanza Mine property includes the Harquahala and Golden Eagle mines, located approximately eight miles south of Salome, Arizona. The project totals 2,656 acres and has significant underground workings, from which some 180,000-200,000 ounces of gold were reportedly produced from high-grade ore in the late 1800's and early 1900’s. Mined rock and tailings from previous operations represent an additional potential resource.