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|As Coal Mining Areas develop, problems relating to strata control increase. The "easy" coal has been extracted and the future development lies in the direction of greater depths of cover and more difficult strata conditions. To provide solutions to the problems encountered the techniques of constructing and testing physical models have been developed and refined. With a sound knowledge of model theory allied to practical experience, mining research engineers use physical cemented material models to examine, assess and solve mining problems relateu to strata behaviour and environment. For a model to provide the answer to a particular mining problem it is essential that as much information as possible be obtained from the mine or area of a mine which the model is to represent. Details relating to the strata, geological malformations, and the stress environment must be collected and collated to ensure reliable results.|