PENINGKATAN EFISIENSI PENGISIAN BAHAN BAKAR OLEH TRUK-TRUK PRODUKSI DI TAMBANG GRASBERG PTFI

• Main Author: YOS PARINGAN (NIM : 29109118), TITUS
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/19569
• Institution: Institut Teknologi Bandung

Grasberg hauling trucks are known as the most important fleet of the company to deliver <br /> <br /> <br /> <br /> <br /> ore and waste materials either to dump or crusher area. They consist of three major fleet namely <br /> <br /> <br /> <br /> <br /> Cat 793, Komatsu 930E/E-2 and Cat 797 that have average hauling capacity of 276 metric tonnes. <br /> <br /> <br /> <br /> <br /> They are supported by two major fuel stations, namely Megashop and Surabaya fuel stations that <br /> <br /> <br /> <br /> <br /> are located separately. Since last year, the mining activity has been more focused at Pushback 9N <br /> <br /> <br /> <br /> <br /> and 8E and waste materials are intensively dumped at west dumping area, which is located quite <br /> <br /> <br /> <br /> <br /> far away from most of Grasberg support facilities, especially the fuel stations. The situation has <br /> <br /> <br /> <br /> <br /> become an issue when the trucks are assigned for refueling after dumping at west dump area. has <br /> <br /> <br /> <br /> <br /> indicated delay hours as unexpected cause of the loss. The delay hours is getting longer and <br /> <br /> <br /> <br /> <br /> longer during recents months and there are several factors can be identified as the cause of such <br /> <br /> <br /> <br /> <br /> condition. If the increase of delay hour is converted to the truck operating costs per hour, there <br /> <br /> <br /> <br /> <br /> would be a decrease in the efficiency of hauling activities in Grasberg as the production cost per <br /> <br /> <br /> <br /> <br /> unit is increasing to US$ 0.05. <br /> <br /> <br /> <br /> <br /> Several identification analysis has been applied, such as in the queuing process, <br /> <br /> <br /> <br /> <br /> determining the location in comparison with the traveling time as well as the refueling plant <br /> <br /> <br /> <br /> <br /> capacity analysis only to find out the main cause of this problem. The analysis lead to a <br /> <br /> <br /> <br /> <br /> conclusion that the location of material dumping is now far from the refueling facilities which <br /> <br /> <br /> <br /> <br /> causes the increase in traveling time to the fuel station. The location of the existing fuel stations <br /> <br /> <br /> <br /> <br /> are now no longer reliable to support the production requirement if adapted to the mine plan in the <br /> <br /> <br /> <br /> <br /> future. <br /> <br /> <br /> <br /> <br /> Some approaches have been taken into consideration including the queuing analysis at the <br /> <br /> <br /> <br /> <br /> refueling service bay, the center-of-gravity method to identify the refueling location that is more <br /> <br /> <br /> <br /> <br /> relevant to the requirement of mine operations in the future and also a linear programming <br /> <br /> <br /> <br /> <br /> analysis to seek for the most efficient transportation to the refueling stations. The result of such <br /> <br /> <br /> <br /> <br /> analysis indicates that it is recommended to relocate the refueling facility in Surabaya area to be <br /> <br /> <br /> <br /> <br /> closer to material dumping area at west dump. <br /> <br /> <br /> <br /> <br /> The analysis has indicated a cost saving of about US$ 4 millions during the year of 2012 <br /> <br /> <br /> <br /> <br /> from variable and fixed operating cost of refueling process as a result of relocating Surabaya Fuel <br /> <br /> <br /> <br /> <br /> Station to the new location. The capital investment of this project has been calculated and valued <br /> <br /> <br /> <br /> <br /> at US$ 931,000 and with NPV 9% at US$ 875,184 during the first two years of implementation. <br /> <br /> <br /> <br /> <br /> In the end of discussion, there area some supplementary studies that can be implemented as part <br /> <br /> <br /> <br /> <br /> of achieveing the mine production efficiency in the future.