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2014-08-14_PERMIT FILE - M2014027 (3)
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2014-08-14_PERMIT FILE - M2014027 (3)
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Last modified
8/24/2016 5:46:44 PM
Creation date
8/14/2014 3:47:45 PM
Metadata
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Template:
DRMS Permit Index
Permit No
M2014027
IBM Index Class Name
PERMIT FILE
Doc Date
8/14/2014
Doc Name
Adequacy review response
From
Colorado Mining and Exploration, LLC
To
DRMS
Email Name
RCO
Media Type
D
Archive
No
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will separate mineralized from non - mineralized material. The fine mineralized material will be <br />transported by truck to an off -site mill for recovery of gold and silver. The coarse non - <br />mineralized material will be moved to the waste dump. Mining is planned to commence <br />approximately September 1, 2014 and continue for approximately ten years. Existing roads will <br />be used for mine and waste dump access. A berm will be constructed on the outside of the <br />existing road for water diversion and safety. As the open pit is developed a spiral shaped road <br />will be used to access the bottom of the pit and to remove the mined material. <br />All surface disturbances will occur on leased patented mining claims. No Federal lands will be <br />disturbed. New ground disturbance will be restricted to within the historic open pit and on the <br />adjacent historic waste dump. Current planning indicates approximately 9.68 acres will <br />eventually be disturbed, 5.8 acres in the open pit and 3.88 acres on the existing waste dump. <br />Mining and Processing <br />The ore at Crystal Hill occurs in an outcropping, cone shaped, mineralized and altered breccia <br />pipe. The breccia pipe is exposed in the bottom and east sides of the existing open pit. The <br />country rock surrounding the breccia pipe ranges from coarsely jointed, unaltered quartz latite <br />on the eastern side to weakly consolidated, broken, flat -lying agglomerates on the western <br />side. The more erosion resistant quartz latite forms the mass of Crystal Hill and much of the <br />high wall of the open pit. No soil exists in the open pit or on the existing waste dumps. <br />Approximately 100 feet of the breccia pipe will be mined from its present surface exposures, <br />approximately 9,000 feet elevation, to approximately 8,900 feet elevation by conventional <br />open pit methods. Less than 35,000 tons of material will be mined per year and mining will be <br />occurring less than 180 days per year. Crawler type tractors will be used to break and move the <br />ore. No explosives are needed to break and move the mineralized material. The fragmented <br />ore will be crushed and screened on -site, the fines loaded with a front -end loader into trucks <br />and transported to an off -site mill. No more than approximately 1,000 tons of fine ore bearing <br />material will be on site at any time. It will take no more than 30 days to move this material to <br />the off -site mill. Mining should be completed within ten years; however, this projected time <br />frame is tentative and based only on projections from historic resource estimates. Due to the <br />geologic character of the Crystal Hill ore body, additional precious metal bearing rock may be <br />found below and adjacent to the planned pit floor. <br />The historic open pit has been engineered with slopes consistent with modern safe mining <br />practices. A geotechnical slope stability analysis and a map is located at the end of this Exhibit. <br />No subsurface water was encountered by previous operators while enlarging the open pit or in <br />groundwater monitoring wells. The western side of the pit is day lighted and has topographic <br />closure. This condition will continue to exist as the pit is deepened. No acid mine drainage <br />exists, or emanates from the open pit inasmuch as the sulfide minerals and water necessary to <br />produce acid effluent do not exist in the present ore zone at Crystal Hill. <br />
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