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EXHIBIT D MINING PLAN <br /> 1. General Mining Plan <br /> The property boundary was surveyed and is staked on site; the new permit area will be surveyed <br /> prior to any site disturbance. Map C-1 shows the Current Conditions of the King Pit. Mine access <br /> is via Colorado State Highway 150—Los Caminos Antiguos Road accessed from U.S. Highway <br /> 160 to the south, as it has been to this point. <br /> The currently mined gravel zone is estimated to be 25 feet thick and is overlain by 0-5 inches of <br /> topsoil and variable depths of overburden at its deepest areas. Actual mining depth may exceed <br /> 25 feet, but design slopes will remain constant. The deposit rests on over 5,000 feet of <br /> Pleistocene alluvial fan deposits composed of the Alamosa Formation and the Santa Fe <br /> Formation deposited above greater than 9,000 feet of Tertiary volcanic and sedimentary deposits <br /> collectively underlain by Precambrian basement gneiss. Mining will occur in phases that <br /> advance from west to east and progressively north. Map C-2 shows the Mining plan with <br /> projected phasing and F-1 features the Reclamation plan. <br /> In general, each new mining phase will be mined by first excavating 0-5 inches of topsoil and <br /> underlying variably thick overburden with front end loaders and bulldozers. Overburden is <br /> believed to have a maximum thickness of 2 feet thick and consists of variable compositions of <br /> sandy to cobbley to bouldery clay loam of the Littlebear, Mount Home-Saquache, and Uracca <br /> soil profiles. While considered overburden, cobbles may be recovered from the above mentioned <br /> loam units. Topsoil, overburden, and separated waste fines will be stockpiled and used to backfill <br /> the slopes of mined out areas to a 3H:1 V slope during Reclamation as shown on Map F-1. <br /> After overburden is removed, gravel mining will reach a depth of approximately 25 feet below <br /> the pre-mine ground surface. The maximum active highwall will be 40 feet tall and 300 feet <br /> long. The King Pit mines using"dozer push to stockpile" and "front-end loader to portable plant" <br /> techniques that result in 3H:1 V side slopes and a pit floor that matches pre-mining slopes of <br /> approximately 5H:IV. New mining areas will be developed in 40 acre phases. Prior to initiating <br /> a new phase,the previous phases will begin reclamation. <br /> King Pit Greg 1 rwicki aad Aswoclatrz Pl,l(' <br /> February 2018 D-1 <br />