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<br />wwre B,axics tviu~re <br />ExHrarr C <br />6.3.3(1)(d) Thickness of Deposit to be Miaed <br />Page 2 <br />The alabaster (gypsum) bed to be mined is approximately 242 ft thick. Eventually the White Banks <br />workings will be extended into overlying beds of dolomite and quartzite, 77 ft thick, and black <br />marble, 58 ft thick, both of which will be mined for dimension stone. The beds dip to the northeast, <br />north, and northwest, from west to east, at from 35 ° to nearly 50 °, so overburden increases rapidly. <br />All proposed mining will be underground. <br />6.3.3(1)(e) Description of Major Components of the Operation <br />The major components of the White Banks operation are as follows: <br />FDR 310: The mine access road from Colorado Highway 133 is U.S. Department of <br />Agriculture White River National Forest (WRNF) Forest Development Road 31. This <br />is a public road which passes directly through the permit area. It is a graded and <br />ditched dirt road with dip crossings and water bars as necessary constructed by <br />WRNF. Avalanche Creek Marble & Alabaster (ACMA) has agreed to cooperate with <br />WRNF as necessary in the maintenance ofthe segments ofFDR 310 it uses, including <br />dust control, if ACMA's use thereof significantly degrades the road or causes <br />excessive fugitive dust. FDR 310 is aloes-gradient road, gaining only about 40 feet <br />in elevation between its intersection with CH 133 and the mine site, approximately <br />1,400 feet, for a grade of 2.9%. ACMA's use of FDR totals approximately 1,500 ft, <br />or 1.03 acres. Occasional summer mudflows from Red Canyon and other ephemeral <br />terrain fwther to the east wash over FDR 310, and dirt and rocks from these events <br />has accumulated over time in numerous storage piles along the road as the result of <br />WRNF clearing activities. WRNF and Avalanche Creek Marble & Alabaster propose <br />to use some of this material, which is being pushed into undisturbed areas south of <br />FDR 310, to raise FDR slightly at the east end ofthe permit area and to construct a <br />berm along the southeast side of the permit azea, both to protect the road and main <br />yazd azea from possible future major Red Canyon mudflow events. The resulting <br />berm would guide drainage from such an event into an existing natural and artificial <br />ditch along the southwest boundary ofthe permit area and the old Forest Service road <br />that forms part of that boundary (but is not included in the permit azea), and from <br />there into the abandoned gravel pits mentioned in §6.3.2(c) above. <br />Main Yard: The main yard, or that area southwest of FDR 310„ is an azea of <br />approximately 2.5 acres, dimensions roughly 200 ft x 500 ft; see Exhibit E. This azea <br />will be used for parking, the bathhouse, material storage, a general work azea, and top <br />soil storage. Top soil will be removed from approximately one-half ofthe main yard <br />to allow for these facilities as well as turning. This part of the yazd will ibe graded and <br />graveled to the extent necessary to m;n;m;~e rutting and to allow for diffuse drainage. <br />w July 19, IV99 ~13',IITAI I,I <br />