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2010-11-23_PERMIT FILE - M2009076
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2010-11-23_PERMIT FILE - M2009076
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Last modified
8/24/2016 4:27:15 PM
Creation date
11/23/2010 1:49:51 PM
Metadata
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Template:
DRMS Permit Index
Permit No
M2009076
IBM Index Class Name
PERMIT FILE
Doc Date
11/23/2010
Doc Name
Adequacy Review Response #3
From
Clear Creek County Clerk and Recorder
To
DRMS
Email Name
JLE
Media Type
D
Archive
No
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Permanent cessation of operations will require the complete removal of all milling equipment and trailers as well as <br />the measures described above. The three milling equipment trailers shall have their wooden cribbing removed. This <br />cribbing can be discarded in a municipal landfill. A truck tractor shall then be employed to couple to the trailers and <br />remove them to an offsite location permitted for equipment parking. There is salvage value in this equipment. The <br />remaining conveyors and bins can be sold for salvage or scrap and removed appropriately. Smaller, loose <br />equipment and supplies may be stored in the Crusher Feed pile enclosure structure (that is to remain) for storage. <br />This site is fairly flat and previously contained parked and stored equipment. Minimal grading may be necessary <br />prior to re-vegetation operations. Re-vegetation shall be done within the existing native soil (properly neutralized as <br />stated above) according to previously specified techniques as stated in 6.14(1)(e)(iii - A). <br />These reclamation measures are entirely appropriate to restore this property to rangeland, as defined by the <br />Colorado 1L11.RB Hardrock Rules. Clear Creek county currently has the patented mining claims of this property <br />zoned M-1 (mining and/or residential). The segments of property that have been added to these parcels via the BLM <br />land purchase program are zoned M-2 (mining only). A copy of Clear Creek county zoning regulations are attached <br />at the end of this Exhibit D. It shall be stressed that the only permitted use of M-2 zoned property in Clear Creek <br />county is MINING. <br />Tailings Impoundment Process Water: <br />During normalized operations, process water contained in the Tailings Impoundment is continually recycled to the <br />Water Holding Pond as an important processing medium. Reclamation measures shall be prescribed to manage this <br />process water in the event of unforeseen cessation and forfeiture of the reclamation bond. <br />As previously described above in the Mobile Millsite Reclamation section, any remaining process water in the <br />various mill process circuits and the Water Holding Pond may be drained down to the Tailings Impoundment via the <br />double walled HDPE pipeline for disposal. The amount of water anticipated from the Mobile Millsite facilities is <br />approximately 20,100 gallons. This water can be drained down gradually and in a very controlled manner inorder to <br />prevent overwhelming- the Tailings Impoundment facilities. <br />The total process water that may have to be contended with is 20,100 gallons from the Mobile Millsite + 201,100 <br />gallons that may be stored in the Tailings Impoundment Pond (refer to Exhibit T, 6.4.20(7)(f)) = 221,200 gallons or <br />0.68 acre-ft. <br />Since this process water is not in a condition that can be discharged directly to the environment, a treatment method <br />must be used. Evaporation is the best solution. Considering the relatively high pan evaporation rate averaging 38 <br />inches/year and the average precipitation of 15.72 inches/year, the net evaporation rate would be 22.28 inches/year. <br />At this net rate, it could be reasonably expected that it could take 4-6 months to passively evaporate this water over <br />an average pond area of 1 acre. <br />To accelerate evaporation, a system of pumps and forced evaporation equipment may be employed. Western Pump <br />& Dredge in Grand Junction, CO offers rental units. One such unit is capable of processing 45 gal./min. at our <br />climatic conditions. At this rate, this equipment could accelerate the forced evaporation period of time within 1 <br />week. But to be conservative and add an approximate 25%, contingency, 10 days should be sufficient time. As the <br />captured water is evaporated, the embankment crest may be graded into the beach zone to level the bench and <br />facilitate drainage. <br />Measures shall also be applied to any residual stonnwater that may have been captured by the Stormwater <br />Sedimentation Collection Pond. A maximum storage volume of 184,430 gal. should be considered. Since this water <br />is diverted stormwater, it should be in a quality acceptable to be discharged down Hukill Gulch in the normal course <br />of the watershed. This should be done within 72 hours of the storm event. Enough time should be allowed for any <br />sediment to settle before pumping operations. At an easily achievable 65 gal/min, it would take 2 days to pump this <br />water. If contamination is evident, than this water shall be evaporated in the same manner as the process water. <br />After any standing water has been evaporated, leachate collection will begin to diminish rapidly. The hydraulic <br />conductivity and saturation characteristics of the tailings has been analyzed by TRI/Environmental and is reported in <br />Exhibit C. After surface water evaporation, it can be assumed that the slimes fraction of the tailings are impounded <br />Page 6 of 9
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