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The situation in coal mining industry in Korea which has been worsened in last decade mostly due to the decrease in demand and partly by deepening of mine working levels has brought about drastic production decrease or closure of most mines leaving only several big mines operating in severe hardships. Faced with such unfavorable situations, this study was performed to introduce the measures for enhancing the productivity and thereby lowering the production cost of Dongwon Consolidated Coal Mine - one of a few large-scaled domestic coal mines with prospects of long-term developments and therefore rated as those for sustained government support. The themes studied or proposed for the Dongwon CCM are : coal reserves and coal seam features by levels, status of the mine, possible lower limit of production capacity, underground structure, intensive working, hydraulic power for speeding up of rock-driving and saving energy, compressed air delivery or underground storage system, underground transportation of battery locomotives, local radio control system (for battered locomotive, chain conveyor and coal loading chute), monitoring system of compressed air consumption, underground inductive radio communication and the reduction of work force, productivity increase or cost reduction caused by those measures. (author). 11 refs., tabs., figs.