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Computer simulation can be used as a means of experimentation and evaluation of both truck allocation and dispatching problems especially when analytical methods are not suitable. The simulatioñ anguage known as Q-GERT is introduced and evaluated in terms of its applicability to the modeling of surface mining activities. Through the analysis of a wide variety of situations, the program is proveñ o be an accurate modeling method.

This paper presents a systematic approach to evaluation of the availability of an automated underground coal mining system, the longwall system. Five analytical models are developed by applying the techniques of reliability modeling and stochastic systems analysis. Each model is formulated to evaluate the availability of a longwall system with unique longwall operating logic. The application of these models is illustrated with a case study and the uses of the results are discussed.

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