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III IIIIIIIIIIIII III • <br />999 <br />DIVISION OF MINERALS AND GEOLOGY <br />Deparlmenl of Natural Resources <br />1313 Sherman 51., Roam 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866-3567 <br />FAX: 13031832-8106 <br />August 27, 1998 <br />Ron Thompson <br />Property Manager <br />Basin Resources, Inc. <br />14300 Highway 12 <br />Weston, CO 81091 <br />RE: 1997 Annual Hydrology Report, Golden Eagle Mine, #C-81-013 <br />Mr. Thompson: <br />~I~ <br />DEPAR"FMEf~IT OF <br />NATURAL <br />RESOURCES <br />Roy Romer <br />Go~ernur <br />lames 5 Lnchhead <br />E recmive Dueaor <br />ptichael B. Lone <br />Orvision Direuor <br />The Division has completed review of the 1997 Annual Hydrology Report (AHR) for the Golden <br />Eagle Mine. Two comments were carried over from the 1996 review. The Division notes Table <br />3.1-1, Golden Eagle Mine Well Data. The infomtation in this table satisfies the Division request to <br />indicate well measuring point elevations. Also, a discussion of possible drawdown north of the <br />mined area is included in this years report, as indicated in Greystone's 1996 responses. <br />Analysis of Data and Determination of Impacts <br />Monitoring Frenuency <br />A considerable improvement over 1996 was noted regarding compliance with the approved <br />monitoring plan in terms of frequency and sampling requirements. All samples and site visits were <br />conducted as required. <br />Surface Water Quantity and Quality <br />Two stations on the Purgatoire River are monitored for flow and field parameters on a quarterly <br />basis, and a lab sample is analyzed on an annual basis. PRS-2 is located upstream of all Golden <br />Eagle mining activities and PRS-3 is located downstream of all mining activities. One water <br />sample was conducted at each of these locations, in accordance with the annual sample list on page <br />2.05-47d, Table 23 of the permit. Flow is slightly higher (7%) at the downstream site and water <br />quality is effectively un-changed, with EC values of 267 umhos/cm and 259 umhos/cm from <br />upstream to downstream. Overall water quality is within the standards for all uses. <br />~~ <br />STATE OF COLORADO <br />T~vo surface water stations are monitored on Ciruela Canyon. CCS-1 is located over SW 1 longvvall <br />panel which was mined in the (ate 1980's. No flows were recorded for 1997 in this ephemeral <br />