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December of 1978. Hocever, with this permit application Trinidad Basin <br />• will resume m;n;nq in Section 15 and continue with the orderly development <br />of the mine in Sections 15 and 22. <br />5.2 OPERATIOP7 PLAN - ESTIP'F~TID AREA FOR LIFE OF OPERATIONS <br />The Trinidad Basin Mine is classified as a contour mine, with the <br />mining method known as a haulback technique. In this type of mine, the <br />pit begins at the coal outcrop, or 5-10 feet in frmn the outcrop, and is <br />developed intA the hillside until the ma~rinnim stripping depth is reached. <br />The ~++~~~~ stripping depth dictates that the highwall be 80 feet in height. <br />In the haulback technique or method, an initial box cut is made <br />and then successive cuts are made until the gal has been mined out. ~e <br />material that is removed from the second cut is used to backfill the box <br />• cut, likewise this process of backfilling the previous cut with material <br />from the cut being developed is continued until the last pit is developed <br />and the coal mined. The last cut is then backfilled with the stockpiled <br />material from the box cut. <br />The equipment used in this type of a mine includes the following: <br />dozers, haul trucks, front end loader, drill rigs, grader and ancillary <br />trucks and coal crushing and sizing equipment. The specific uses of <br />each type of machinery listed above will be detailed in the following <br />section. In general, topsoil is removed by the dozer and transported by a <br />front end loader and haul truck. Overburden is then removed by the <br />front end loader and haul trucks. If coaq.:etent overburden materials <br />are encountered they are fractured by blasting the materials and removed <br />by loading it into the haul truck for transport to the dumping area. 'Ihe <br />coal is then ripped and loaded into the haul truck and hauled to the tipple. <br />V-2 <br />