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CashMineNon-DMOCertification AdrianBrown <br />The following evaluation is provided to demonstrate that toxic or acidic chemicals are not stored or used <br />at the Cash Mine, and that acid- or toxic-producing materials will not be used, stored, or disturbed in <br />quantities sufficient to adversely affect any person, any property, or the environment. <br />' 3.1 Chemicals <br />No toxic or acidic chemicals are stored or used in the Cash Mine in such a way as to adversely affect any <br />person, any property, or the environment. <br />A small quantity of sulfuric acid is stored and used in the mine for the purpose of maintaining the <br />' batteries that power underground miner's lamps. Less than 1 gallon of acid is on site at any time, and is <br />stored in an enclosed spill-proof facility at the mine portal. <br />' 3.2 Fuels <br />Diesel fuel is used at the mine to power generators, compressors, motors, and small equipment. The fuel <br />is stored in a double-lined contained facility, and fueling is performed within the containment of that <br />facility, or in subsidiary fueling locations. No release of fuel is anticipated. <br />Combusted fuel products aze not hazardous or toxic, with the exception of trace levels of carbon <br />monoxide, which are dispersed into the atmosphere. <br />3.3 Solvents <br />' Solvents are stored and used in very small quantities (generally less than 1 gallon) for the purpose of <br />cleanup during maintenance of equipment. Solvents are stored in enclosed storage and spill proof <br />' containment areas, and used in very limited quantities. Solvents used on site are non-toxic. <br />3.4 Explosives <br />' Explosives are used as part of the mining activity to fragment the rock by blasting. The explosives used <br />are nitrate-based, principally ANFO (ammonium nitrate/fuel oil), detonated by PETN boosters and <br />detonation cord. Explosive use is anticipated to be approximately 3.7 lb/ton of ore removed, or <br />' approximately 28 ton/yeaz in full production (50 tons of ore per day). <br />Almost all the nitrate in explosives is consumed on detonation; approximately 1%, or approximately 500 <br />' lb remains in the blasted rockmass. Of this, most is loaded and hauled to the mill with the ore; <br />approximately 25% of the blasted material, and hence of the residual ammonium nitrate, remains in the <br />mine as backfill; this represents approximately 125 lb of ammonium nitrate per year. <br />' The only medium in which the ammonium nitrate can cause an environmental or health impact is <br />dissolved in the mine water. Mine inflow occurs at approximately 2 gpm, based on testing during mine <br />' development. If all of the ammonium nitrate is dissolved in this mine inflow, and if all the ammonium is <br />converted to nitrate, the concentration of nitrate in the mine water would be 6.7 mg/L as nitrogen. This is <br />less than the MCL for drinking water for nitrate, which is 10 mg/L nitrate (as nitrogen). Thus the <br />' maximum impact on groundwater that can occur as a result of explosives can not adversely affect any <br />person, any property, or the environment. <br /> <br />' 1607A-20061210 3 <br />