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west. The overburden will be excavated using scrapers and dozers and then placed or <br /> pushed into an adjacent mined pit block. However, when excavation begins in Nucla East <br /> area, overburden material will be placed adjacent to the pit onto land designated as a <br /> temporary overburden stockpile (see Exhibit 12-3). <br /> During overburden removal operations, some selective handling of material will be <br /> performed in each mining area (Area No. 1, No. 2, No. 3, and Nucla East) based on chemical <br /> and physical core data contained in Tab 6 and discussions presented in Tab 21. <br /> After the upper coal seam is removed in Areas No. 1, No. 2, and No. 3, the parting <br /> material, composed of alternating layers of sandstone and shale, will be removed. The <br /> parting material is approximately 8 to 9 feet thick and is removed by scrapers or dozers <br /> and placed or pushed into an adjacent mined pit. <br /> After the overburden or parting has been removed above each individual coal seam, a dozer <br /> or loader will clean off any overburden or parting material remaining on top of the coal. <br /> In order to facilitate handling of the coal, a dozer will rip or break up the coal. <br /> Contracted 25-ton coal haulage trucks will be loaded by a wheel loader. Once a truck is <br /> loaded, the coal will be transported approximately six miles to the power station. Table <br /> 12-1 lists the major mining equipment to be used at the Nucla Mine. <br /> The estimated amount of overburden and parting volumes to be extracted and corresponding <br /> swelled volumes for all mining areas are presented on Table 12-2. <br /> Coal Supply Agreement <br /> The coal customer (Colorado-Ute) will be performing an approximate two-year burn at its <br /> Nucla Power Generating Station to test and adjust recently installed circulating <br /> fluidized-bed combustion boilers. During this test burn phase, coal having differing <br /> quality characteristics will be evaluated in order to optimize generating station <br /> performance. It is anticipated that coal from the Nucla Mine will be used for a portion <br /> of the test burn. <br /> The coal supply required from the Nucla Mine for the two-year period (1987-1988) is <br /> estimated to be 300,000 tons. The coal customer will periodically order coal from Nucla <br /> Mine throughout this two-year period and during the next two-year period (1989-1990). <br /> 12-3 Revised 08/19/88 <br />