15th International Conference on Ground Control in Mining, Golden, Colorado, 13–15 August 1996Authors: A. M. Richardson and L. J. Gilbride (AAI), and J. Trackemas and J. Mercier (Cyprus Plateau Mining Corporation) The significance of a massive sandstone unit in the immediate roof to longwall support weighting is well known. If the unit lies in the [...]
Publications: Underground Mining
3rd International Workshop on Coal Pillar Mechanics and Design, Morgantown, West Virginia, July 26, 2010Authors: Tom Vandergrift and David Conover (AAI) Currently accepted longwall abutment gate-road design criteria result in very large pillar sizes under deep cover. This leads to ventilation challenges, and makes it difficult for development to keep pace with longwall retreat. One [...]
Design Methods in Rock Mechanics, Proceedings of the 16th U.S. Symposium on Rock Mechanics, University of Minnesota, Minneapolis, September 1975 Authors: M. P. Hardy and J. F. T. Agapito (Golder Associates, Inc.) The Colony pilot mine provided valuable pillar strengths that should form the basis of any subsequent mine designs. As no commercial oil shale [...]
18th Conference on Ground Control in Mining, Morgantown, West Virginia, 3–5 August 1999 Authors: A. M. Richardson, J. F. T. Agapito, and L. J. Gilbride (AAI) The trona mines in the Green River Basin, commonly known as the “trona patch,” present an interesting set of rock mechanics issues stemming from mining in a unique underground [...]
28th U.S. Symposium on Rock Mechanics, Tucson, Arizona, 29 June–1 July 1987 Authors: J. F. T. Agapito (AAI) and D. R. Shoemaker (Molycorp, Inc.) Evaluation of ground stability and support requirements during block caving operations at Molycorp’s Questa Mine was conducted with the help of a simple rock mechanics program consisting of underground mapping and [...]
7th International Conference on Ground Control in Mining, 3–5 August 1988 Authors: H. N. Maleki (AAI), R. D. Tifft III (Cyprus-Yampa Valley Coal Company) and M. P. Hardy (AAI) The results of five years of geotechnical investigations are presented to develop productive and stable longwall layouts for the Foidel Creek Mine. The program was initiated [...]
