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EXHIBIT D MINING PLAN <br /> 1. General Mining Plan <br /> The permit area will be surveyed prior to any site disturbance. Maps C-2 show the mining plan. <br /> Map C-2A shows the anticipated extents of mining five years into the life of the operation. Map <br /> C-213 shows the final mining conditions. This is estimated to be 15 years into the life of the mine. <br /> Mine access will be via the Westbound I-70 on ramp, the current site access point. An improved <br /> access road will be installed from the on ramp, meeting Clear Creek County standards. This road <br /> and its anticipated disturbance area have been included in the permit boundary. A Colo. Dept. of <br /> Transportation (CDOT) access permit has been submitted. The applicant anticipates that CDOT <br /> will require acceleration and deceleration lanes and other improvements. The extent of the <br /> required improvements is not known at this time, but given how much larger the CDOT right-of- <br /> way is than the road in this area, it is not anticipated that these improvements will require <br /> property outside of the right-of-way. The CDOT right-of-way can be seen on Map C-1. <br /> The gravel zone is estimated to be 200+ feet thick in an alluvial deposit and is overlain by <br /> roughly 12 inches of gravelly loamy sand. The deposit sits atop a Precambrian-age gneissic <br /> metasedimentary rock that was intruded by Tertiary igneous, granitic rock. Mining will proceed <br /> as deep as possible without encountering groundwater. Drilling conducted by Deere and Ault in <br /> 2009 showed groundwater at roughly 100-120 feet below the current ground level. Therefore,the <br /> current mining plan stops at what is believed to be just above the groundwater level. If during <br /> mining, groundwater is encountered higher up, the excavation will backfilled to two feet above <br /> groundwater level, and this will be the new mining depth limit. <br /> The cross sections shown on Map C-3 show the baseline, mining, and reclamation topography. <br /> The final elevation of the proposed operation will be a minimum of 10 feet above the West Fork <br /> of Clear Creek. The West Fork of Clear Creek will not enter into any pit or depression below its <br /> grade.No portion of the mining will enter the West Fork of Clear Creek, and a barrier of in-place <br /> native material will be maintained until the very end of the operation to prevent stormwater from <br /> discharging from the operation to the creek. The barrier will not be removed until revegetation <br /> has successfully taken place in the disturbed areas. When removed, reclamation of its footprint <br /> DMR t.wrA anA ASv an .Pf f f <br /> February 2019 D-1 <br />