I n a mining activity, mechanical equipment is absolutely needed to supportmining activities. This research is carried out an optimization of loading equipment,by considering the operating cost of the loading equipment, which is the biggestcost in mining activities By optimizing the loading equipment used, it is expected tosupport mining activities to be more optimal and can reduce the operating costs ofmining equipment. The research method used is an action approach researchmethod that aims to determine the most efficient method. The P&H 2800 ElectricShovel productivity is 3339 tons/hour, the productivity of the O&K RH 200Hydraulic Shovel is 3103 tons/hour and the productivity of the Cat 793 Haul Truckis 125.3 tons/hour The production target of the Grasberg open pit is 160,000tons/day. In achieving the target, it needs 2 P&H 2800 Electric Shovels, 2 O&KRH 200 Hydraulic Shovels and 116 Cat 793 Haul Truck with a production of221,363 tons/day and operating costs of 27,889 USD/hour. Optimization is done byobserving the availability of equipment, productivity and operating costs, by usingonly one type of loading equipment, the P&H 2800 Electric Shovel. It takes 3 P&H2800 Electric Shovel and 91 Cat 793 Haul Truck to achieve production targets. Theproduction obtained is 176,268 tons per day with an operating cost of 21,788USD/hour. The combination of the actual equipment operating cost is 3.063USD/ton, the operating cost of the planned equipment combination is 3.024USD/ton and the operating cost of the recommendation equipment combination is2.967 USD/ton. There is an operating cost efficiency between the combination ofthe actual equipment with the combination of the recommendation equipment andthe combination of the planned equipment with the combination of therecommendation equipment. The efficiency of the operatimg cost for thecombination of the actual equipment with the combination of the recommendationequipment is 0.096 USD/ton where there will be an operating cost savings of6,203,454 USD/year, while the efficiency of the operating cost for the combinationof the planned equipment with the combination of the recommendation tools is0.057 USD/ton where there will be an operating cost savings of 3,680,322USD/year