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<br /> <br />Portland Limestone Quarries (M-1977-344) Permit Amendment-02 <br />Holcim US Inc, 3500 Highway 120, Florence, CO 81226 Revised pursuant to preliminary adequacy review November 20, 2023 <br />Phone (719) 288-1443 www.holcim.us 72 <br /> <br />Figure 2.4.3-1 Mine Plan Blocks <br />2.4.4 Mine Infrastructure Development <br />The mine will develop as two distinct development projects. MTAC from the plant to RCQ and the Hwy 96 <br />Access to RCQ will be developed first. Once safe access is available for contractors, vendors and <br />employees, development of the mine infrastructure will begin including fencing and RCQ mine buildings <br />and utilities. <br />2.4.4.1 Material Transport and Access Corridor <br />MTAC will include an access road for employees and vendors and the planned overland conveyor system <br />(Figures 2.4.4.1-1 thru 3). The corridor will extend from the plant to RCQ or approximately 6.7 miles. The <br />conveyor and a maintenance road will lie inside a chain link fence. The access road will lie west of the <br />conveyor fence. <br />The gravel access road will be 40 foot wide to allow safe passage of both employees and equipment in <br />both directions. The road will be constructed with road base as the sub grade and 8 inches of gravel. The <br />road will have 10-foot-wide graded shoulders. <br />The conveyor will be constructed as the road is being constructed. The conveyor will be an overland <br />system with 13 elevated wildlife crossings. The wildlife crossings will be constructed over shallow natural <br />ravines or dry stream beds. The elevated section will span approximately 95 feet, reaching an elevated <br />height of 10 feet 9 inches, allowing the safe passage of wildlife along MTAC. The conveyor will be <br />supported by steel supports on precast concrete pads set on the graded and leveled ground surface ever y <br />9 feet.