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~~~~ ~~== =~ ~ ~~~ III IIIIIIIIIIIIIIII TWIN PINES TECH. REv. 3 PAGE 1 TECHNICAL REVISION NO. 3 COAL PROCESSING WASTE AREA SECTIDN 2.06.10 OF THE APPLICATION GENERAL DESCRIPTION A technical revison for a "Coal Processing Waste Area" is being submitted at this time to provide for the disposal of material hand picked from coal processed for domestic consur:ption. Prior to this date the hand picked material was processed for possible sale at a reduced rate. Plans have been formulated to increase the efficiency of hand cleaning domestic coal products, thus increasing the by-product. To alievate accumulation of the material on site, a disposal area is required. The material picked from the coal is generally a band of white rock about 2" thick, which is characteristic of the Brookside Coal seam. In areas of the mine, coal will adhere to the band of ock _Processing_will_tend to shear the coal from the rock band. The rock does weather to a fine grained material. Long range planning for the mine may require an additional disposal area for underground development waste and/or additional coal processing waste. Coal cleaning facilities for the mine have been investigated. An economically feasible cleaning unit has not been found to fit the needs of the mine but is still being considered in long range planning. DESCRIPTION OF PROPDSED AREA The proposed "Coal Processing Waste Area" lies ad,iacent to the Twin Pines Coal Sales Site in a previously disturbed area utili-<ed by the original Twin Pines Mine. ( Refer to the drawing "Coal Processing Waste Area", attached). The area was within the origanal Twin Pines permit boundry and was reclaimed in 1982 by Twin Pines Coal Company. Additional reclamation was completed ad,iacent to the South Dak Creek Channel in 1987 by the abandoned mines program. Reclamation of the site created an artificial valley which appears to be ideal for a disposal site. The area is protected from runoff with a ditch and berm above the original highwall and from South Dak Creek by a large mound between the creek channel a~d__the--va~lley.~-The en.tire_area is in _previously disturbed ground,~~tri_pped for access t_o the origina'. Twin Pines ~Min~ Vegetation cover is sparce. - - - - - - -- Three test holes were excavated in the proposed area to observe the insitu sub-soils and observe ground water conditions. The holes were excavated to a depth of 8 to 12 ft. or to bedrock. No ground water was observed in the test holes. The material was generally fine grained sandy to silty soil with granite cobbles increasing with depth. Some mine spoil existed in test holes 2 and 3. Test logs are shown on the drawing. A general geological section of the proposed area is shown on the drawing. 1