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Preliminary analysis of sites in reference to DMO status Rules. <br />Per Rule 1.1(14), definitions: <br />A) None of the sites uses chemicals in metallurgical processing. <br />B) Toxic forming materials maybe the main focus. The primary concern is the stockpiling of <br />ore on waste piles and the geo-chemical make up of the rock waste being deposited on <br />the surface. Contamination build up of surface materials from prolonged use of an area <br />may be an issue of concern. The long term and short-term exposure at the surface of ore <br />stockpiles needs to be reviewed. Waste rock analysis should identify if there is any <br />potential metals or natural toxins that need to be addressed. <br />C) No discharges from the mines or waste piles have historically been observed. Water and <br />rock sampling should identify any potential for acid mine drainage. <br />D) If a DMO designation is warranted all sites are in the 110d definition. <br />E) The focus of the review is to determine the potential for AMD or other contamination <br />risks. <br />Staff through separate correspondence will make a formal request from Cotter for water, sample . <br />data and a composite sample of waste rock along with other noted issues. after engineering and <br />supervisory review. It will also+be noted that DMG staff will review the information,gathe[ed in <br />.cone with the sampling in its preliminary assessment of the DMO issue. _, , ,. . <br />Russ Mean~~ <br />EPS II <br />Grand Junction Field Office <br />Enclosures: 3/24/05 inspection reports for the above referenced sites <br />