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STATE OF COLORADO <br />DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866-3567 <br />FAX: (303) 832-8106 <br />COLORADO <br />D I V I S ION OF <br />RECLAMATION <br />MINING <br />SAFETY <br />Bill Ritter, Jr. <br />Governor <br />DATE: 21 April 2010 <br />TO: Wallace Erickson <br />FROM: David Bird <br />James B. Martin <br />Executive Director <br />RE: Geochemistry Review, Wildcat Mining Corporation - May Day Mine, M-1981-185 <br />1) The analyte list shown in Attachment B-3 is not as comprehensive as DRMS would like for a hard <br />rock metal mining operation that disturbs sulfide-bearing rock. The recommended analytes are as <br />follows: <br />For ground water sampling: All parameters listed on Table 1 through 4 in CDPHE Regulation 41- <br />Basic Standards for Ground Water. The Operator may omit Total Coliforms, Asbestos, Free <br />Cyanide, Chlorophenol, Color, Corrosivity, Foaming Agents, Odor, Phenol, Gross Alpha Particle <br />Activity, and Beta/Photon emitters. These regulations are available at: <br />htti)://www.cdphe.state.co.us/regulations/wQccregs/100241 wgccbasicstandardsforgroundwater.pdf <br />For surface water sampling: All parameters on Tables I through III in CDPHE Regulation 31- Basic <br />Standards and Methodologies for Surface Water. The Operator may omit D.O., Suspended Solids, <br />Temperature, E. Coii, Total Residual Chlorine, Free Cyanide, Sulfide, and Asbestos. The Operator <br />can provide a total chromium analysis rather than the separate analyses of the chromium species <br />Cr(II1) and Cr(VI). To allow comparison of water quality data to aquatic life standards, the analyses <br />must also report either total hardness or separate analyses of Calcium and Magnesium. These <br />regulations are available at: <br />hgp://www.odphe.state.co.us/regulations/wgccregs/100231wgccbasicstandardsforsurfacewater pdf <br />2) Most analytical reports included in the application (e.g., Attachments B-3 and C-4, Table C-2, C-3, <br />C-4) provide insufficient information pertaining to what the samples represent, how they were <br />collected, or the location on the site where they were collected. DRMS needs a detailed description <br />of where and how the samples were collected, including a location plotted on a map and a photograph <br />of the sample. Also, please explain why sample "Type 1- May Day" matrix is shown as rock but <br />concentrations are mg/L. Finally, the analyte lists need to be expanded to be consistent with the <br />recommendations of comment (1) above. <br />3) Total Quant is regarded as a semi-quantitative method with accuracy of f 50%. Therefore, DRMS <br />will add 50% to each analytical result in evaluations of potential impacts. The operator has the <br />option of providing more quantitative analyses. <br />Office of Office of <br />Mined Land Reclamation Denver 9 Grand Junction 9 Durango Active and Inactive Mines