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CashMineNon-DMOCertification AdrianBrown <br />' approximately normal to the main fabric. The orebodies in the district are in general located on the main <br />structures. The structures in the district also generally comprise permeable conduits in the rockmass. <br />' 2.4 Mining <br />The Cash Mine is an underground gold mine that currently extends to a depth of 668 feet below ground <br />level. The mine has been developed on nine levels, at an average vertical spacing of approximately 70 <br />feet. <br />Development of the mine to date has been along two ore-bearing veins: the Cash Vein, and the Freiburg <br />' Vein. These veins are sub-vertical, trending approximately NE-S W, and they converge at the eastern end <br />of the mine. <br />' Mining has been performed in general by the overhand cut and fill method. The vein orebody is removed <br />by blasting the back and face, and the void created is backfilled with non-ore material to form the <br />platform for further extraction. Where there is insufficient waste for backfilling, the stopes were left <br />' open. An estimated 90,000 tons of ore have been recovered from the mine to date. <br />The proposed mining at the site will continue this mining strategy, possibly utilizing cemented paste <br />backfill for stope filling. No hazazdous of environmentally significant materials will be used in the <br />' mining process, or liberated as a result of it. <br />2.5 Processing <br />' The ore produced from the Cash Mine is to be processed in the Gold Hill Mill, an adjacent facility to the <br />north of the mine (licensed under Colorado Division of Reclamation, Mining and Safety Permit <br />' M-1994-117). The separation process involves crushing and grinding, gravity separation to recover free <br />gold, followed by froth flotation of the gravity separation tailing to recover gold-bearing metal sulfides. <br />The gold-bearing concentrate will be shipped offsite for processing. Tailing from the froth flotation <br />process will be discharged to the double lined tailings facility at the site. No hazardous or <br />environmentally significant materials will be used in ore processing. <br />' The tailings from the site may be recovered, cement added, and pumped underground for use as <br />cemented backfill. It is anticipated that this cemented backfill will contain no hazardous constituents as a <br />result of ore processing, and will contain only trace levels of sulfide minerals. Further evaluation will <br />' provide detailed characterization of any tailings backfill that may be proposed in the future so that the <br />operation will continue to qualify as anon-Designated Mining Operation. A technical revision to the <br />mining and reclamation permit will address any proposed tailings backfill at a future date. <br />3. NON-DESIGNATED MINING OPERATION DETERMINATION <br />Certification of non-Designated Mining Operation status by DRMS requires that "...an operator <br />demonstrates to the board ... that toxic or acidic chemicals are not stored or used on-site and that acid- <br />or toxic producing materials will not be used, stored, or disturbed in quantities suj~cient to adversely <br />affect any person, any property, or the environment... ° 34-32-112.5 (2) C.R.S. <br />' i601A-20061210 2 <br />