ANALISIS PRODUKTIFITAS ALAT BERAT PADA PEKERJAAN OVERBURDEN DI PIT B TAMBANG BATU KAPUR PT. SEMEN BATURAJA TBK

Abstract

Overburden is a layer of soil or rock that is above and directly covers the mined material so it needs to be removed first before excavation is carried out for the limestone excavation. Stripping of overburden begins with excavation using mechanical equipment in the form of an excavator loading tool and transportation equipment in the form of a dump truck located in Pit B of the limestone mine, PT. Semen Baturaja Tbk. The analysis method used is qualitative and quantitative methods, interviews. The work volume is 12,800 m3/day and based on the results of the analysis carried out, the productivity of the CAT 330 excavator at PIT B is obtained with a cycle time of 17.82 seconds (0.30 minutes) and a productivity/hour of 446.13 m3/hour with a total productivity of 6,245.82 m3/day. The productivity of the Mitsubishi Fuso 220 Ps dump truck at PIT B cycle time is 1,1880.66 seconds (20 minutes) and productivity/hour is 50,718 m3/hour with a total productivity of one dump truck of 2,130.15 m3/day. From the results of calculating the cost of heavy equipment in the field, it was concluded that the cost of heavy equipment in the field was a CAT 330 excavator Rp. 971,831.72,- and a dump truck Rp. 1,050,906,- with the same working hours for both tools, namely 14 hours. The production target for overburden work at PIT B was not achieved and there was a waiting time with the match factor value obtained being 0.36, so the actual match factor obtained by MF < 1 means it can be concluded that the excavator is waiting for the dump truck.