EVALUASI GEOMETRI JALAN TAMBANG UNTUK MENINGKATKAN TARGET PRODUKSI BATU KAPUR 2.000 TON/BULAN PT. SUMBAR CALCIUM PRATAMA, KABUPATEN LIMA PULUH KOTA, PROVINSI SUMATERA BARAT

Abstract

PT. Sumbar Calcium Pratama is a company engaged in open pit mining and processing of l imestone in Jorong Ateh Loban, Nagari Halaban, Lareh Sago Halaban District, Fifty City District, West Sumatra Province. In supporting its production, PT. West Sumatra Calcium Pratama requires an effective road access design that complies with standards so as not to hinder production activities. From the actual data in the field, it was found that the road segments had non-ideal straight road widths, namely segments 1, 2, 3, 4, 5, and 9, while the ideal straight road width after calculations was 7 meters, on the bend road width t here were four non-ideal road segments, where the ideal road bend width is 10.5 meters. Then there is a road grade that is > 10% to be precise in segment 8 (12.25%) which of course this is not in accordance with t he applicable provisions according to AASHTO 1994. Because this will certainly affect the total rimpull, speed, circulation time, and productivity of the tool transport. From the calculation results, the actual productivity value of the conveyance is 1.47 tons/hour, while the planned productivity of the conveyance with a hauling distance of about 2.8 km is 2.08 tons/hour. After the theoretical calculations were carried out with the road conditions having been repaired, the productivity of the transportation equipment was 2.18 t ons/hour, which means that after the road was repaired theoretically the productivity reached even more t han the plan. While the production target in February was 2,000 tons/month, with actual production of 1,416 tons/month. After doing theoretical calculations, it was found that production was 2,100 tons/month, which means that it exceeded the production target. The conclusion of this study is that road conditions will affect the total rimpull, the total rimpull will affect the speed, then the speed will affect the cycle time, and t his cycle time will affect the productivity of the conveyance.