Laserfiche WebLink
~ ~ III IIIIIIIIIIIIIIII <br />TR9PPER 1RINING INC. 999 <br />June 9, 1987 <br />CERTIFIED P577401527 <br />Mr. Gregg Squire <br />Colorado Mined Land Reclamation Division <br />423 Centennial Building <br />1313 Sherman Street <br />Denver, CO 80203 <br />Dear Gregg: <br />~~~~~~~® <br />JUN 10198T <br />MINED LAND <br />RECLAMATION DIVISION <br />RE: Trapper Mines proposed historic production standards, Division's response <br />Following are Trapper Mine's responses to the Division's comments on our pro- <br />posed historic production standards for postmine grazing lands and wildlife <br />habitat. <br />Division Comment: <br />1. Trapper has presented six years of production data in the proposal. As a <br />matter of policy, the Division requires seven years of data in order to <br />ensure that natural precipitation cycles (low to high) have been expressed <br />in the data. As Trapper has noted, the data for years 1982, 1983 and 1984 <br />indicate above-average precipitation. This would appear to skew the <br />standard toward higher values. The Division can accept the standard based <br />on the six years of data, though Trapper may wish to submit 1986 data to <br />present additional data from a year with a more normal precipitation <br />record. <br />Response• <br />Enclosed Table 1 provides seven years of production data for premine range <br />sites A, B, and C. The 1979 data, as collected, includes both herbaceous pro- <br />duction and shrub production. Therefore, in order to calculate herbaceous <br />production, the total 1979 production was multiplied by the percent herbaceous <br />component given in the appropriate Soil Conservation Service (SCS) range site <br />description. Percent herbaceous production was obtained from SCS range site <br />descriptions for Brushy Loam (Trapper Mine range sites A and B) and Clayey <br />Foothills (Trapper Mine range site C). These SCS range sites are close <br />approximations to the Trapper Mine range sites based on species composition. <br />Trapper cannot provide 1986 data since no premine sampling was done in 1986. <br />Division Comment: <br />2) In order to verify [he range of precipitation cycles, Trapper should <br />submit precipitation records from 1979 through 1985 for a station at or <br />near the mine. <br />cont. <br />P.0. Box 187 Craig, Colorado 81626 (303) 824-4401 <br />