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~o~ a~e~s Iilllliilllliiillll <br />g~ <br />for longwall mining <br />at Cyprus Twentyrnile Coal <br />Cyprus Twentymile Coal's L-A 3000 shearer cute 4.5 ktRl (5,000 stphl of cosl at its Colorado lon9we11 operation. <br />Editor's note: In October, Cyprus Amax announced <br />that it was selling its coal operations, including the <br />Twentymile Mine. See news item on page 19 of this issue. <br />wring several months in 1996 and 1997, Cyprus <br />Twentymile Coal Co. (TCC) set world produc- <br />tion records at its Twentymile Mine in north- <br />western Colorado. These records were due to the <br />company's implementation of estate-of-the-art longwall <br />mining and conveyance system along with a highly dedi- <br />cated work force. <br />This article is a case study of the design of long pan- <br />els at [he mine from conception to implementation. <br />Obstacles that needed to be over- <br />come included subsidence engineer- <br />~ ~ ~ <br />ing, environmental regulations, <br />conveyance, ventilation, equipment Gary Buchan,mem6ef <br />design and continuous miner (CM) <br />IS maaaQef 0( <br />$ME <br />development timing. , <br /> (eChalCai SBIVICBS, <br />Background C~plus iweorymile Coal, <br />TCC is located in northwest <br />29515flounCauory <br />Colorado about 32 km (20 miles) <br />southwest of Steamboat Springs. floatl,Na.21,0akCleek <br />The mine began as a continuous C080461. <br />miner operation for Getty Coal in ~ <br />MINING ENGINEERING ~ DECEMBER7998 27 <br />~., ' r... - ..- ~ , <br />