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M' <br />' (Page 2) ' <br />MINE ID # OR PROSPECTING ID # M-77-297 <br />INSPECTION DATfi 3/12/9a INSPHCTOF:'S INITIALS~71-IlL <br />OBSERVATIONS <br />This inspection was conducted by Wally Erickson from the DMG Durango Office. Don En~3lishman, BLM, and <br />Tony Bates, Frank Barnett and Dan Johnson, Umetco, accompanied the DMG inspector throughout the <br />inspection. The 9.9 acre permit area is located adjacent to pre-law mining disturbances grid structures. Mine <br />status is Temporary Cessation, commencing 12/4/96. DMG holds 519,000 financial w~irranty. <br />Backfilling & Grading -Burros portal and shafts /1 5 and 7 were backfilled and sealed. Operator indicated that <br />the 500' deep Burros 7 shaft had been backfilled with waste rock material and capped with 5' concrete plug. <br />Waste rock stockpile for the Burros 7 shaft had been regraded to slopes ranging from 5Ff:1 V to 3H:1 V with <br />contour furrows on 10' centers. Backfilled and graded areas appeared stable. Metal hoi:;t building and steel <br />headframe were intact at the Burros 7 shaft. Three Butler buildings with concrete foundations, one concrete <br />foundation with concrete vault, and two abandonded trucks were located at the Burro:• 5 shaft. <br />Hydrologic Balance -Tops of waste rock stockpiles had been graded and bermed to contain surface drainage. <br />Additional stormwater retention berms were observed within natural drainage channels. Stormwater retention <br />berms were located in dry drainage channels, upslope and downslope of affected areaa•. Surface drainage <br />from the access road was routed to the top of the Burros portal waste rock stockpile. Upland drainage for <br />the Burros portal waste rock stockpile was routed around the stockpile by 18"CMP culvert. Toe of waste rock <br />stockpiles for the Burros 7 shaft and Burros portal were lined with large sandstone block<.• (2'- 5'diameterl to <br />reinforce toe of slope, control erosion, and ensure containment of waste rock material. <br />Evidence of recent heavy precipitation was observed. Stormwater retention berms located downslope of <br />affected areas appeared to be intact and stable. However, several stormwater retention berms for upslope <br />areas had been breached. Drainage from breached berms appeared to have been contained by the access road <br />drainage ditch and conveyed to the Burros portal waste rock stockpile. Drainage convey~;d to the top of the <br />Burros portal waste rock stockpile appeared to have been contained by the stormwater containment berms <br />located on top of the stockpile. Surface settling on top of the stockpile had resulted from drainage infiltrating <br />into the stockpile. Evidence of concentrated drainage from the stockpile was not observed along the outslope <br />and toe of the stockpile. Additional evidence of heavy precipitation was observed at thy: CMP culvert inlet, <br />which conveys upland drainage around the Burros portal waste rock stockpile. Culvert clid not appear to be <br />blocked, however, drainage appeared to have exceeded culvert capacity. Excess upland drainage overtopped <br />culvert inlet and flowed to top of the stockpile. Maintenance and/or repair of stormwater structures is <br />necessary to ensure continued adequate control of surface drainage. <br />I & E Contact Address cc: Tom Gillis, DMG <br />^ CE <br />NAME Tonv Bates X BLM, Don Engli<_hman <br />OPERATOR Umetco Minerals Corporation ^ FS <br />STREET P.O. Box 1029 ^ HW <br />CITY/STATE/ZIP Grand Junction. CO 81506-8728 ^ HMWMD (CHI <br />^ SE <br />^ WOCD ICH1 <br />X Umetco Dove Cn:ek, Frank Barnett <br />