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Bureau of Mines Ripper Miner.

Morrell-RJ; Larson-DA; Schmidt-RL
Soc Min Eng AIME Preprint 89-132 1989 :16 pages
The U.S. Bureau of Mines has developed a hardrock cutting concept and incorporated it into an extraction system called the ripper miner. This concept uses a single, wide bit that attacks the rock at a shallow angle and slow speed. Research has demonstrated that the system is capable of excavation rates exceeding those possible with conventional drill-blast and can effectively cut rock too hard for conventional roadheaders or continuous mining machines. It has the additional advantages of low bit wear and dust generation. This highly flexible concept is applicable to both mining and driving development openings and can cut any material from coal to hard rock. A single ripper miner can perform the functions of a continuous mining machine, a roadheader excavator, and a tunnel boring machine. This paper presents the history of the development of the ripper miner from the initial laboratory tests through the construction and testing of the full-scale, laboratory prototype. It includes a comparison of the ripper miner to systems currently used from the standpoint of energy efficiencies and operating costs.
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OP 97-89
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Soc. Min. Eng. AIME Preprint 89-132, 1989, 16 PP.