2021-09-16_REVISION - M1983033 - Laserfiche WebLink

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Walstrum Spur Amendment, Exhibit D—Mining Plan revised September 2021 Amendment is between 300 and 1,000 feet higher than the elevation of Highway 6. Stage S and the new added areas serve to act as a natural sight berm along the southern perimeter of the mining area. This is consistent with the current design on the Existing Quarry area. 3.0 MINING PLAN Note: DRMS Guidance from Rule 1: General Provisions and Requirements — Permit Process, Section 6.4.4 Exhibit D Mining Plan is shown in italics for each section. 3.1 Methods of Mining 6.4.4(a) description of the method(s) of mining to be employed in each stage of the operation as related to any surface disturbance on affected lands; The mining methods currently used in the Existing Quarry will also be used in the Spur Amendment area. In general, the overall site manufacturing process is as follows: Raw resource is blasted using explosives and the resulting fragmented rock is hauled by truck to the on-site manufacturing plant to be made into construction materials including fine and coarse aggregates; photographs of the mining and manufacturing operations are shown in Appendix D-1. Aggregate products are then hauled offsite by customers using their own over-the-road trucks or a third-party hauler under contract to the Operator. Mining consists of three steps detailed below: Site Preparation • Locate and install markers to identify the Dig Line • Extend pioneering roads into the area to be developed • Install stormwater collection ditches downslope of the area to be worked, normally along the pioneering road, to intercept runoff from upslope areas and divert flows to the Existing Quarry • Clear vegetation — Where practicable, trees will be harvested and put to beneficial use such as firewood and lumber, and woody and herbaceous vegetation will be incorporated into the growth medium. Resource Extraction • Bulldoze benches into the terrain • Push growth media to the edges of newly formed benches for later use in concurrent reclamation. The growth media will be placed to minimize erosion and located where disturbance is ongoing on active bench. Berms, swales, and intermediate seeding will be utilized as required. • Modify or extend the existing two track and haul road into the working area • Extract overburden/weathered material and incorporate into road base material • Conduct drilling • Conduct blasting (further described in Section 3.9 Explosives) • Extract competent resource, load into haul trucks, and transport to manufacturing facility Manufacturing • The existing manufacturing equipment (Primary, Secondary, and Tertiary crushing and screening plants) located on the Existing Quarry floor is used to manufacture material from both the Existing Quarry and will be used to manufacture material from the Spur Amendment • Fines generated from the processing plants will be stockpiled on-site and/or placed in the approved location in Gilpin County. See Exhibit C-3 Mining Map for the locations. The mining methods described in this plan are essentially unchanged from those described in the 1983, 1985, and 2002 mining plans with one exception: Whereas the Existing Quarry has been mined from the bottom up, the Spur Amendment will be mined from top down. This top-down method will be utilized in the Existing Quarry from this time forward. QTETRA TECH Page 3 1 9