Mining Engineering Overburden Production Catchment Area Coal Productivity S Agriculture (General) Sump Costs Design Pit Dump Truck Efficiency Heavy Equipment IRR Match Factor NPV Open Channel Pump Settling Pond Target Production coal fuel Abstract. This study discusses optimal solution to handle water entering coal mining Block B PT. Minemex Indonesia. Water comes from ground water and surface runoff that floods the ground floor of the mining work area Andesit Stone BUMDes Batubara Black-Scholes-Merton Formula Briket Briquette Cash Flow Coal Mining Coal Reserves Coconut Shell Commissioning Cost Cost of Production Crushing Plant Disturbance Effective Hours Effective Working Hours Employee Perception Evaluasi Evaluation Excavator Exchange Rate Flame Flat Jack Flatjack tool test Fleet Fleet Management