GENERAL33660 - Laserfiche WebLink

Home Browse Search

~ III IIIIIIIIIIIII III ~ 999 COLOtvtA ORO MOLiNO~ INC. (COM, INC.) GOLB HII.L MILL STORM WATER MANAGEMENT PLAN SWMP PERMIT NO. ®R-040073 RECLAMATION PERMFf NO. M-94-117 Desointion of MininpAdivilier The Gold Hill Mill, owned by Colina Oro Molina, ]nc. (COM, IncJ is located ]0 miles west of Boulde Colorado in the SE 1/4 of the NW 1/4 of Sectio+u 12, T1N, R72W, in the 6th Principal Meridian The mill and associatod tailings pond is eo an elevation between 8525 and 8600 feet, There ere currently 6.20 acres permitted and 3.46 accts dishabed. The mill processes ore by crushing, and grinding. The ore is separated from waste rock (tarlirrgy) by gravity sepma4on on tables mud gravity cones, and by flotation using soda ash, pine oil and xenthate to condition the ore and promote flotation The tailings ere thicloerred in a thickener tank end pumped outside to alined tailings Pond adjacent to the-mill building through a PVC pipe that is buried most of the way to the teilvrgs pond. Ore is tnrdted to the mill and dumpcdvr a two compartment ore bin adjacent to the mill. The art is withdrawn from the bins by conveyors et the bottom of the bim. Ore is conveyed into the mill building when the processing is completed The mill building is a 70.faot by 120.foot metal building that houses all of the gushing grinding, conceruuating, end ihic]renitrg circuits. Tailings are spigoted into the tailings pond, crtaiing a beach mrs end a pond eras created by decant water. The decant water is pumped back to the mill to be reused in the Processing circuit. During arty storm events, storm water is drown off the tailings through a decmrt line above the tailings sends and through a PVC discJumge line to the Haul A edit located below the tailings pond. The storm water is stortd behind a bulkhead in the edit end pumped back to the mill to be used es process water or diverted to the tailings pond for evaporation Any leakage from tlu bulkhead is contained by a cofferdam. Water from the cofferdam is pumped back behind the bulkhead. The process and storm water from the tailings pond is a closed loop - The mill has not processed any ore since mid-1994. Several conditions in the DMG reclamation permit must be met before milling operations emu resume. 2. A_rur Srrbfed To EA7uent Lindt~iows Glriddines The following areas are oat subject W the SWMP guidelines (oroeess waterl: • Arta 1 -Runoff from the perlang lot ,ore storage bin, mine waste dumps that were leveled for the perking lot, and runoff from the southwest side of the roof on the mill building. Runoff is collected by a berm end french drain system below the waste dump and piped to the tailings pond through a solid PVC buried pipe. • Aree 2 -The tailings area includes the tailings pond and a backslope that extends up to a berm end ditch above and behind the tailings pond Moat of the area below the ditch is