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iii iiiiiiiiiiiiiiii <br /> 999 <br /> STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Depanment of Natural Resources <br />1313 Sherman St., Room 215 y <br /> <br />Denver, Colorado 80207 Il <br />~~ <br /> <br />Phone: (303) 866-3567 I <br />FAX: (303)872-8106 <br /> DfiPARTMEN'I' OF <br />November 15, 1994 NATU~iL <br /> RESOURCE <br />Al Weaver Roy Romer <br />Governor <br />Eaergp Plle19 COal, Iao• lames S. LOChhead <br />P.O. BO% 449 Esecmive Dvec mr <br />Florence, CO 81226 Michael B. lung <br />Urvision Dueuo~ <br />R8: Julp 1, 1993 to Juae 30, 1994 Annual Hydrology Report and <br />Review <br />Southfield Mine (C-81-045) <br />Dear Mr. Weaver: <br />The Division has completed its review of the 1993-1994 Annual <br />Hydrology Report. Below are the highlights of the review which are <br />separated by subject matter. <br />i. Mine Inflow <br />Changes that have occurred in the mine since last year's <br />report: <br />A. It is apparent from the amount of inflow recorded this <br />year that the mine is experiencing an ever-increasing inflow <br />rate in the 2 North mining section. In fact, the area's <br />inflow has increased 70$ from 1993, up from 25.8 ACFT to 43.6 <br />ACFT. Of the 18,327,000 total gallons of inflow recorded for <br />the year, 14,194,720 gallons are from the North Dewatering <br />Well located in the North main section. This comprises 77.5$ <br />of all inflow recorded. The increase may be due in part to <br />several factors; new fracture zone penetration, coal <br />dewatering, precipitation infiltration, drainage from <br />abandoned workings above the 2 North section or a combination <br />of these factors. The report indicates that new fracture <br />zones have been encountered in the mining operations at sites <br />8 and 9. Therefore, the reasons for the increase could be <br />twofold; from new fractures coupled with drainage from the <br />abandoned workings above and updip from the 2 North section. <br />Several large underground mines have operated in the past <br />directly above the 2 North area. The Pioneer Canon Mine, <br />Canon National Mine and Liberty No.3 Mine are historic mines <br />directly above the 2 North section. <br />As for a recharge factor from direct precipitation on the <br />