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Exhibit Page 14 EXHIBIT D - MINING PLAN GENERAL CONCEPT: General Site Information The 9.1 -acre Wallace Pit is located on the southern edge of Hay Camp Mesa. The proposed conversion /expansion totals 283 acres and includes 3 separate areas: • the eastern 78 -acre area on which the existing 9.1 -acre 110 permit is located, on the southern slope of Hay Camp Mesa, including 3.8 acres of affected land and 4480 linear feet of existing, permanent road (2.47 acres) through the area. • the 8.4 -acre area of affected land currently part of M1990 -025 and previously used by McStone Aggregates (d /b /a Four States Aggregates) for mining and plant operations, located just east of the high - voltage Western Area Power Administration power line. • the central 33.9 -acre area, including the WAPA powerline easement (including a pylon) and the road (810 feet, 0.22 acres) used to inspect and maintain those pylons, along with some erosion from heavy use and poor maintenance, a portion of 2350 linear feet of existing trail (0.65 acres) along the north boundary of the permit, and a 2810 -foot existing road along the south boundary /property line (0.77 acres). • the western 166 -acre area on the crest and southern slope of Hay Camp Mesa, including portions of 2510 linear feet of existing trail (0.69 acres) along the north boundary of the permit, and other existing trails /roads. The material to be mined is alluvial and aeolian sand and gravel deposits of 5 to 50 feet thickness overlaying clay deposits and shale bedrock, and is located on the top of Hay Camp Mesa, south of the divide between the Dolores River (to the north) and its tributary, Lost Canyon Creek. The top of Hay Camp Mesa is cut by numerous ravines, those on the site draining to Lost Canyon Creek (to the south). Some lower portions of the site have been significantly modified to control and collect runoff into stockponds. There are many other, possibly non- significant structures, such as fire trails and fences. The mineable sand and gravel deposits are found primarily on the flat top of the mesa, sometimes exposed and sometimes covered with overburden and topsoil, and extending to as low as elevation 7400, with outwash of sand and gravel along the side - slopes in small deposits generally not workable economically except in the western portion of the site. The material to be mined generally falls into two categories: a predominantly red material with a high fines content which can be processed and used as the surface of gravel roads; and a predominantly white material which is coarser and can be crushed and screened into a variety of sand and rock products for multiple uses. The thickness of construction materials and overburden varies greatly. So mining of some areas may be unproductive. The entire site drains into Lost Canyon, via several unnamed drainages. Some drainages are controlled by stock ponds (dams /dugouts) (retention basins) near the south (lower) boundary. Site elevation varies from 7180 to 7580. Vegetation ranges from bare rock and talus slopes to fairly dense pinyon - juniper woodland. (Please see Exhibit J.) Current Status /Past Mining Activities The proposed permit area includes two areas currently permitted with affected land: (1) The current M1983 -028 110 area of 9.1 acres (incorrectly reported in numerous locations as 9.9 acres) is located as shown on Map C -1 A and contains up to 3.76 acres of affected land including 380 feet of 10 -foot 1:1 "highwall." A separate report of this is provided at Exhibit S. (2) The expansion includes 8.4 acres of land currently affected land within and under M1990- 025 (including 900 feet of 20 -foot highwall), and 33.9 acres of land NOT currently affected but to