PENGARUH PERUBAHAN HARGA BATUBARA TERHADAP RANCANGAN PIT LIMIT DI PT.PENGEMBANGAN INVESTASI RIAU

Abstract

PT. Riau Investment Development (PT.PIR) is now carrying out mining activities in the West Pit of Block A of PT.PIR. This research aims to find appropriate mining boundaries and provide the best profits in the West Pit of Block A of PT.PIR. The BESR calculation method itself can be used as a benchmark for creating new pit designs so that they produce good profits. This research itself uses quantitative methods and uses Break Even Stripping Ratio calculations which can be found by looking for the selling price of coal, total coal production costs and total overburden removal costs. For the Pit, the initial design of the PT. PIR company had an SR of 1:5.39 with coal reserves of 1,724,000 tons. And the net profit for this design is IDR 66,369,707,988 with a BESR value of 1.50. The ultimate pit limit design itself has an SR value of 1:6.40 with existing coal reserves of 1,210,000 tons and a BESR value of 0.46.