Evaluasi kinerja pemindahan overburden ditinjau dari produktivitas alat gali- muat dan alat angkut di front kerja 2 TB 2.2 Tempilang Kabupaten Bangka Barat mitra PT Timah (Persero) Tbk

TB 2.2 Tempilang is managed by partner of PT Timah (Persero) Tbk. Mining system that applied is a system of mechanical mine, where mining activities carried out by moving the overburden material prior to mine kaksa layer. The problem that occurs was the productivity of conveyance on the actual condition only 98.76% of target had been determined, which led to their failure in overburden removal volume amounted to 1.24%. Therefore, it was necessary to do an evaluation of the performance affecting factors of load haul equipment and conveyance in the field. Evaluation was carried out by calculating the value of productivity, work efficiency and Match factor. The data required included cycles time data, effective working time, the amount of bucket loading, the type of overburden material and haul road geometry. Then the data was processed using the formula of mechanical soil removal and analyzed based on the literature related to the problem. The factors causing productivity conveyance has not reached the target after the evaluation due to low efficiency of work, the least amount of bulk bucket loading, and the low value of match factors. The Alternatives can be done to improve the productivity of conveyance is to increase the effective work time, additional of bucket load haul equipments and additional of conveyances. Effective work time should be increased from 12.34 hours to 14.23 hours, so the work efficiency become 79.03% from 68.58% to the achievement of production is 113.80%. Bulk bucket should be added from 15 times to 20 times, so the productivity become 131.68 m3 / hour of 98.67 m3 / hour. Conveyance which is originally 2 units coupled into 3 units, resulting in a change of match factor equipment performance from 0.69 to 1.04 with the achievement of production is 141.14%