2017-11-29_PERMIT FILE - M2017056

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EXHIBIT C Mining Plan The proposed Harmony Gardens Site permit area contains verified aggregate resources. The new supply will provide construction materials to meet the northern Colorado demand. Introduction and Overview The applicant anticipates mining and reclaiming the proposed Harmony Windsor Site in approximately four (4) months. However, the rate of mining and overall life of the mine is dependent on several factors including product demand. Test pits have verified that commercial deposits of sand and gravel exist to about 10 feet below the surface of the ground. In addition to the commercial sand and gravel materials, clay, silt, and other non-marketable materials excavated from the proposed permit area will be used on-site for reclamation. Traditional organic topsoil on most of the site is thin (less than 4 inches thick), but is thickest in areas where crop production was most common. Most of the soils are sandy loams that are well drained. The topsoil and overburden will be stripped separately prior to mining the deposit and stockpiled or used immediately for reclamation. Although the mining area is small, plans currently include mining in three phases — the mining areas are immediately east (Phase I) and west (Phase II) of the Sinclair pipeline and Phase III is on the far western edge of the property (see Exhibit E, Mining Plan Map). An internal haul road will connect all three mining area phases. There is an improved gravel farm road that connects the proposed permit area with Weld County Road 74. Even though the proposed permit area will be mined in three phases, integration of mining and reclamation is still applicable within each phase. In areas where the reclamation plan requires it, as the pit reaches its maximum depth and edges are completed, they will be backfilled and reclaimed. In areas where the final pit depth has been achieved and operations are no longer present, backfilling and reclamation of pit walls will extend onto the floor. The only water used on-site for production will be for dust control. Water for dust control will be trucked to the site from other locations. Therefore, no new water demands will occur on the proposed Harmony Windsor Site. Mining Methods Groundwater is not expected to be encountered during mining and the deposit will be dry mined. Mining will occur within 200 feet of the Lake Canal Ditch, however, depth of mining will not reach the elevation of the ditch and intercepting ditch seepage is not anticipated. Mining will proceed by first stripping and stockpiling topsoils and overburden. The exposed gravel will then be removed in lifts and screened and/or transported off-site for processing. Since the material is unconsolidated deposits, no blasting is required. Harmony Windsor Site DBMS Limited Impact I10 Permit Application Page 7