Tombstone Exploration Corporation announced in partnership with Goldrock Resources Inc. and the Bonanza Mining Company the execution of a significant contract with 5D Mining & Construction, Inc. (“5D”) for the building of the heap leach pad for the Bonanza Harquahala Mine. Phase One construction of the Bonanza Heap Leach Project is anticipated to start on or about May 25, 2020, with full project completion expected by mid-September. Per the contract, 5D will supply labor, equipment and materials to perform all of the civil work and liner installation for phase one. Phase Two, currently under consideration, includes a much bigger package where have potentially identified 150,000 – 300,000 oz of Au in defined underground targets in and around the old Harquahala mine with significant upside potential. The 5D contract for construction for this first phase of the Bonanza Heap Leach Project includes all survey work required for layout and grading, debrushing the work area, demolishing obstructing concrete structures, relocating and stockpiling the existing tailings, mass grading for the PLS pond and leach pad, all trenching and backfill for the liner anchor trench, fine grading for the liner, installation of the liner and perforated drain pipe, including required support work. Over the course of its 20-year history, 5D has become a major construction company in and out the mining industry and is one of the most respected contractors in the Copper Corridor area of Arizona. Located in Globe, Arizona, 5D has provided work for some of the companies in the world, including BHP Billiton, Capstone Pinto Valley Mine (Capstone Mining Corp.), Freeport-McMoRan Miami, Grupo Mexico ASARCO Hayden, and many others.