Tombstone Exploration Corporation announced in combination with Goldrock Resources Inc. and the Bonanza Mining Company that the construction phase is moving smoothly. The project is on track for the complete build-out of the heap leach pad and pond and install of liner and production equipment at the Bonanza Harquahala Gold Mine in La Paz County, Arizona for early November 2020. The pad earthworks were completed in the third week of September ahead of schedule with the liner install to start on October 12. The plastic liner material has been delivered to site in preparation for the install with all liner welding equipment and personnel to mobilize this week. Engineers reviewing the liner install will also mobilize for an October 12 start. The carbon columns have been refurbished and are being shipped to site for a delivery of mid-October. All pumps and pad piping including drippers and valves have been ordered and have been delivered or being delivered by mid-October. A gravity survey is being completed to identify the final water well location. The survey will be completed by October 8 and water well drilling will commence thereafter. 5D Mining and Construction, the Company's earthworks contractor, also completed installing the initial roads and the crusher pad and will be ready to mobilize the crusher near the third week of October. The crusher and agglomeration facilities will take approximately one week to set-up with crushing expected to start towards the end of October depending on liner placement. 5D has also completed the carbon column pad location and the cyanide tank location. The tanks are being delivered. Bonanza has also contracted with Drake Cement to provide agglomeration cement and are finalizing a cyanide contract with Cyanco to provide cyanide and a tank by the end of October. All other chemicals and carbon are being purchased for an end of month start-up. The earthworks for the leach pad and pond were completed in August and are ready for liner installation. To date, the principal production area has been cleared, grubbed and fine graded to plan and is now ready for the liner. The pregnant solution pond is complete and ready for liner installation and the pond berms have been compacted to engineering specifications in preparation for installation of the leach pad liner and processing facility installation. 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. Once leaching has started, bi-weekly delivery of the carbon to a designated gold processing facility is expected. Based on past metallurgical testing, production is budgeted at 23,000 ounces of gold from first phase of production. Heap leaching is an industrial mining process used to extract precious metals and other compounds from ore using a series of chemical reactions that absorb specific minerals and re-separate them after their division from other earth materials. Similar to in situ mining, heap leach mining differs in that it places ore on a liner, then adds the chemicals via drip systems to the ore, whereas in situ mining lacks these liners and pulls pregnant solution up to obtain the minerals. Heap leaching is widely used in modern large-scale mining operations as it produces the desired concentrates at a lower cost compared to conventional processing methods such as flotation, agitation, and vat leaching.