Laserfiche WebLink
.~ <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />137 3 Sherman SL, Room 215 C O L O~ D O <br />Denver, Colorado 80203 D t v t 5 1 o N o r <br />MIN <br />A L S <br />Phone: (303) 866-3567 & <br />FAX: (303) 832-8106 G E O L O G Y <br /> <br />~~ <br />~, RECLAM ATION•MIN ING <br />~~i\, ~I <br />\ <br />~ SAFETY•SCIENCE <br />January 9, 2004 ~w JU 41 <br /> Bill Owens <br /> Governor <br /> Greg E. Walther <br />Jlm StOVer Executive DireLYOr <br />J.E. Stover & Associates Ronald W. Cattany <br />2768 Compass Drive, Suite 101 Division Director <br />Grand Junction, Colorado 81506 Natural Resou¢e Trustee <br />RE: McClane and Munger Canyon Mine <br />Permits C-1980-004 (McClane) and C-1981-020 (Munger) <br />2001 and 2002 Annual Hydrology Reports (AHR's) <br />Dear Mr. Stover: <br />The Division has completed review of the referenced AHR's. Our review comments are <br />presented below. <br />2001 Annual Hydrology Report <br />In general, the report format and content was consistent with previous years, and complies <br />with permit requirements. Monitoring data indicates that there is no impact to the local <br />hydrologic balance, as predicted in the Probable Hydrologic Consequences section of the <br />permit application package (PAP). East Salt Creek shows no impact from mining activity. <br />Total dissolved solids (TDS) levels are lower downstream of the mines than upstream, and' <br />other dissolved components occur at about the same concentrations above and below. <br />There is no indication of impact to the groundwater system. <br />2002 Annual Hydrology Report <br />Overall, the repdrt demonstrates that there has been very little in the way of impact from <br />mining activity on the groundwater or surface water systems in the mine vicinity. <br />Conductivity of alluvial groundwater (and hence TDS) was higher upstream of the mines <br />than downstream. East Salt Creek TDS analyses is higher than baseline values both <br />upstream and downstream of mining. TDS below the mines was slightly higher than <br />upstream, but this would not appear to be due to mining activity, considering that mine <br />discharge water TDS was lower than East Salt Creek surface water TDS. <br />Requests and Recommendations <br />1. The permits require twice a year sampling of two ephemeral drainages, McClane <br />Creek and Munger Creek. These drainages exhibit typical flashy flows after intense summer <br />storms, and brief snowmelt runoff in wet years. As such, it is typically the case that the <br />streams are dry when scheduled quarterly sampling is conducted. Permit language states <br />Office of Office of Colorado <br />Mined Land Reclamation Active and Inactive Mines Geological Survey <br />