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A detailed analysis of a conventional field-trial was performed in which a continuous miner was employed to cut coal with one set of standard and another set of experimental carbide tipped conical coal bits. Wear was measured in terms of the weight loss suffered by each bit. Though all of the bits were subjected to nominally same wear conditions, they exhibited different severity of wear at the end of the field-trial. For the sake oof analysis, the bits were classified in four 'wear modes' representing the progressive nature of wear. A comparison between standard and experimental bits was performed in terms of the wear mode distribution and the cumulative frequency distribution of weight loss in each wear mode. Based upon some experimental observations and simplifying assumptions a model was developed which attempts to describe the entire weight loss history of each bit in the field-trial. The wear mode distribution and the cumulative frequency of weight loss distribution at the end of the field-trial are the needed data for the model.