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UNDERGROUND DEVELOPMENT WASTE <br />' Operational Conditions <br />The underground development waste produced by mining will be placed in the <br />' adjacent pit previously affected by surface operations. The revised area for <br />disposal of development waste will be the area as shown in Map 4, Foidel Creek <br />' Mine Plan Map. <br />' The estimated volume of material to be wasted in the pit is 50,000 cubic <br />yards. The material will be deposited from an open highwall with a front end <br />' loader, track run dozer or directly from an underground ram car. Compaction <br />will be performed similarly to that which will be done in reclamation of <br />adjacent surface mined areas. The deposition of the waste material will be a <br />' stable configuration bounded on all sides. No geotechnical investigation is <br />considered necessary. <br />' Map 11, Foidel Creek Mine Surface Area Cross Sections, shows a typical <br />' cross section of the disposal area (Section Y-Y'). Represented in these cross <br />sections are the approximate disposal depth and postmining topography. <br />Geologic Conditions <br />' The site of the proposed disposal operations is located in a surface mine <br />pit where the Wadge coal seam was extracted. The Wadge seam and overburden are <br />part of the Williams Fork Formation of Cretaceous age. The lithology, structure <br />' and stratigraphy of the mine area are fully described in Section 2.04.6 of <br />Twentymile Coal Company Permit No. C-056-82. <br />' The lithology and stratigraphy of the Wadge seam and overburden are very <br />' consistent over the mine area, as shown on Map 8, Foidel Creek Mine Geologic <br /> Cross-Sect ions A-A' and B-B'. It follows that geochemical concentrations are <br />' also consi stent in the coal, roof <br />i <br />ill h <br />l <br />d <br />l and floor <br />h <br />f of the underground mine. For this <br />i <br />d t <br />ti <br />th <br />l <br />hi <br /> reason, a s <br />ng <br />e <br />r <br />o <br />e was c <br />or cor <br />ng an <br />es <br />eac <br />ng <br />osen <br />ng <br />e <br /> potential of waste rock material, which is representative of the underground <br />' mine plan area. The location of the test hole 006-83-66 is shown on Map 7, <br />' 1 <br /> <br />