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EXHIBIT D <br />1. General Mining Plan <br />MINING PLAN <br />The property boundary has been surveyed on site and the permit area will be surveyed prior to any <br />site disturbance. Map C-2 shows the mining plan. <br />The gravel zone is approximately 30 feet thick in an alluvial deposit and is overlain by soil and <br />overburden ranging from 4 to 15 feet. In general, the area will be mined by first excavating <br />soil/overburden with front end loaders which will be used to backfill the slopes of mined out areas <br />to a 3HA V slope as shown on Map F-1. The raw gravel material will then be loaded into a <br />crusher/screen plant where various sizes of product will be made and placed in separate stockpiles. <br />Dozers may also be used to move topsoil/overburden or gravel. Mining activities are expected to <br />occur approximately 3 to 5 months per year, while the processing operations including <br />screening/crushing and washing can occur any time of the year. Mining will proceed from Pit 1 to <br />Pit 2 and 3 as shown on Map C-2. The mining of the deposit will occur to the limits shown on Map <br />C-2 and will be mined to a slope no steeper than 0.5H:1 V in order to maximize gravel recovery. <br />Backfilling with overburden will create the shallower reclaimed slopes. <br />United Companies mines using a 0.5H:1 V to near vertical slope on active mining faces. Highwall <br />mining will progress to an offset line from the crest line, which marks the mid -slope of the 2H:1 V <br />mining slope. Both boundaries will be staked prior to mining in the area. This offset serves two <br />purposes. First, the volume of material left in the highwall will allow the crest to be pushed <br />towards the toe with the final mining slope of 2H:1 V, which will maximize gravel recovery and <br />additionally will reduce the required backfill material to bring the slopes to a 3H:1V slope. <br />Secondly, this offset provides additional slope safety. A failure would be governed by the internal <br />angle of friction of the material. This would limit the failed slope to an angle of 38 degrees or <br />—1.3H:1V. This failure would not only stay within the permit area, it would stay within the final <br />slope envelope. Such a failure is unlikely given that only the active slope is near vertical. <br />The maximum total tonnage sold from the site in any one calendar year is 378,750 tons, though <br />the expected annual average is 90,000 tons. The raw material will be sold as various products: <br />crushed rock, chips, road base, concrete, and asphalt. A breakdown of the product tonnages and <br />Tri County Pit Sept 2016 D-2 <br />