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_ ~ III IIIIIIIIIIIIIIII\ • ri- ` .. FLINTKOTE BUILDING MATERIALS MANUFACTURING DIVISION • THE FLINTKOTE COMPANY P.O. a0% 269. FLOREN GE, COLORADO 8122fi (303) 78G-6375 ~ ~ _ _ _ _ _ _ - -~ L.. ., - • ~ ~, - J.~~) u J i~i~ Co'... U~~i i. .i~ ~ a. ~l ~I ~..].. ,~1 January 23, 1978 Mr. James L. Schmieding Reclamation Specialist Mined Land Reclamation Division Colorado Dept. of Natural Resources 723 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 RE: Coaldale puarrv Your file ~k77-247 Per your request at our 1/17/78 meeting and tour of the mine site, the following information concerning your comments on the narrative and data submitted in the Mining Permit Application. 1) As you may recall from inspection of the sites prepared for seedling plantings scheduled for April, 1978, slopes are 2:1 or lower over the greatest part of the area. Slopes up to 1:1 mentioned in the narrative were pointed out during the mine site visit to be experimental areas of bench heights less than 20 feet. Seedling plantings in these areas will give mine personnel a better idea of planting survival rates on 1:1 slopes in a location of law precipitation, high permeability, and proven low erosion problem area. Utilization of revegetation at 1:1 slopes at Coaldale, if successful, could mean substantial monetary savings in the reclamation cost, while complementing the natural steep slopes surrounding the affected land and undisturbed sites in the area. Again, I wish to stress that our experimentation with L:1 slope revegetation will include approximately 10% of the seedlings planted in the first few field seasons. 2), 3), Where benches are utilized for hangingwall control and waste dumps, 30' widths and heights will be used. Thirty foot benches are employed on all extraction faces. As pointed out during your visit, stabilized highwalls up to 200' high and up to 80% from the horizontal will be utilized in certain areas of the mine until mining is near completion.