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<br />Mount Royale Ventures, LLC <br />9145 Sunshine Canyon Dr. <br />Boulder, CO 80302 <br />Telephone: 720 565-3448 <br />Fax: 720 565-3497 <br />December 4, 2007 <br />Ms. Valois Shea <br />EPA Region 8, 8P-W-GW <br />1595 Wynkoop Street <br />Denver, Colorado 80202-1129 <br />Dear Ms. Shea, <br />Mount Royale Ventures, LLC (MRV) - the operators of the Cash & Who Do <br />Mines and Gold Hill Mill - pursuant to the Code of Federal Regulations Part 146 hereby <br />submit the following information in application for an Underground Injection Control <br />Permit for a Class V well (CFR146.5(e)(8)). <br />Introduction <br />MRV operates the Cash & Who Do Mines (CO-DRMS Permit #M1983-141). Ores <br />produced from these mines are processed in MRV's Gold Hill Mill (CO-DRMS Permit <br />#M1994-117). As part of the mining process, MRV plans to return the mill tailings to the <br />underground workings as a sand or cemented sand backfill. <br />Geology <br />The area of the proposed well is entirely underlain by a batholith of Boulder Creek <br />Granite. This granite "ranges from a very coarse grained mottled pink and black biotite <br />granite ...to a medium grained quartz monzonite gneiss"'. Strong northwesterly faults <br />known as breccia reefs exist with lesser fissure veins providing the orebodies for mining. <br />The veins range from a few inches in width to several feet, with only a foot or less of <br />altered granite adjoining. These veins typically strike N30°E-N60°E and dip from <br />vertical to 60° both NW and SE. Mineralization includes a wide range of tellurides, some <br />sulfides, some carbonates, quartz (both bold and horn varieties) with massive silica <br />flooding. Alteration of the host rock is cerrusitic. <br />Iniectate <br />The proposed injectate is comprised of the gangue minerals remaining after beneficiation <br />by gravity and flotation methods, from the ores produced from the receiving "well" <br />location. These ores are gold and silver telluride ores typical of the well-known Gold <br />Hill mining district. Chemical analysis of the ore, the tailings and the water associated <br />with the tailings are provided. MRV would like the option of backfilling with and <br />without a cement or pozzolanic additive. <br />' Lovering, T., Goddard, E.N., 1950. "Geology and Ore Deposits of the Front Range of Colorado", United <br />States Geological Survey Professional Paper 223, USGPO, Washington.