PERBANDINGAN PERENCANAAN PENAMBANGAN BIJIH TIMAH MENGGUNAKAN BWD KUNDUR 1 TERHADAP KOMBINASI KAPAL ISAP STRIPPING DENGAN BWD KUNDUR 1 PT TIMAH TBK DI LAUT AIR KANTUNG, KABUPATEN BANGKA

Abstract

BWD Kundur 1 is an offshore tin mining production facility of PT Timah Tbk which operating in Penganak Sea and Air Kantung Sea. Before the activity of mining, mine planning is required for guidelines in the field conditions. At the site of Air Kantung Sea, soil surface are at shallow depths, so the opening of werk takes a long time in order to reach the kaksa. As an alternative can be used Stripping Suction Dredge for excavation of top soil, and BWD Kundur 1 can focus on excavation of kaksa. Mine planning considers the economical analysis of mining and operation of BWD Kundur 1 whereas the calculation of reserves and work block creation with Micromine Software uses two methods of mining namely BWD Kundur 1 and the combination of Stripping Suction Dredge with BWD Kundur 1. Based on the calculation, in 2018 the value of break even point in amount of 54.9 tonnes ore/month and the break even grade in April in amount of 0.439 kg/m3, May to October in amount of 0.220 kg/m3, and November to December in amount of 0.302 kg/m3. The location of BWD Kundur 1 is in Penganak Sea with 500 h/month and LPT 550 m3/h, while in Air Kantung Sea with 400 h/month and LPT 500 m3/hour by using short face system and press method. Combination of Stripping Suction Dredge with BWD Kundur 1 reduces the number of production hours and minimizes mining operating costs. After the calculation, it was obtained Tdh an average of 0.386 kg/m3 and Pdh 692 tons with an average production in amount of 77 tons/month. The Production BWD Kundur 1 is 3,612 hours and Stripping Suction Dredge is 285 hours, with 438 hours saving time and mining cost savings in amount of Rp 2,936,212,747.00.