Laserfiche WebLink
(Page 2) <br /> <br />MINE ID # OR PROSPECTING ID # M-86-076 <br />'' INSPECTION DATE 8/20/98 INSPECTOR'S INITIALS VVFiE <br />OBSERVATIONS <br />This inspection occurred as part of DMG routine monitoring schedule. Ms. Trina Morgan and Ms. Johanna <br />Cramer, from the DMG Denver Office, accompanied the DMG inspector throughout the inspection. <br />The Incas Mine is a 1 10d type permit, approved for excavation and on-site milling of precious metals ore, on- <br />site tailings disposal, 9.94 acres affected area. The permit area is located in an area of pre-law mining <br />disturbances. Pre-law mining disturbances include several small surface excavations, portal and access roads. <br />Operations were active during the time of this inspection. DMG holds 540,358 financial warranty. <br />Signs & Markers - Mine identification sign was posted at the mine entrance. Affected area perimeter markers <br />were observed. Permitted mining activities appeared to have affected < 1 acre. Affected lands were <br />contained within approved areas. Public access is controlled by two locked gates across the access road. <br />Mine access road was well maintained. <br />Mill Facility - Temporary water and electric line extended from the pre-law portal, located at the downslope <br />end of the permit area, to the mill facility. Operator indicated that water impounded within the pre-law portal <br />was utilized to support milling activities. Mill circuits were enclosed within two 10' x 10' permanent <br />structures, wood frame construction with metal siding and roof, concrete foundation and stem walls. Small <br />crusher and ball mill were sheltered by temporary wood and tarp structure. Sodium cyanide is utilized and <br />stored within the concrete lined portions of the permanent structures. Sodium hypochlorite solution is utilized <br />to destruct the sodium cyanide. The concrete foundations and stem walls, and the roof and walls of the <br />permanent structures appeared intact, no evidence of settling, rupture, or leaking were observed. Structures <br />appeared to have been well constructed and located away from established avalanche paths and drainage <br />ways. Total quantity of tailings on-site was visually estimated at <3 cy. Operator indicated that sand tailings <br />are utilized to mix concrete on-site for construction. <br />Hydrologic Balance - The desired metals occur in low concentrations in sandstone and limestone strata. <br />Operator stated that the ore material and native soils were relatively neutral, approximately pH 7 or 8. <br />Analysis reports from 1997 water samples indicate a pH of 8.10 for surface water samples, and a pH of 7.86 <br />for groundwater samples. Operator is current with the hydrologic monitoring plan. <br />Review of the water monitoring analysis reports has revealed an apparent anomaly in the elevated levels of <br />sulfate, as SO4, relative to the low levels of calcium, shown as CaC03, and iron. Additionally, S0, levels <br />spiked for groundwater sample 95111301, however, pH, iron and aluminum dropped significantly from the <br />preceding sample analysis. Please submit an explanation for the apparent anomaly. <br />I & E Contact Address <br />NAME Bob Hill <br />OPERATOR Deadwood Gulch Mining Co. <br />STREET P.O. Box 96 <br />CITYISTATE/ZIP Hesorus. CO 87 326 <br />cc: Tom Gillis, DMG <br />^ CE <br />^ BLM, Don Englishman <br />^ FS <br />^ HW <br />^ HMWMD ICHI <br />^ SE <br />^ WOCD ICHI <br />^ Other <br />