Optimization Heavy Equipment Productivity Against Costs on Un-Top Soil and Spreading Work With Linear Programming Simplex Method

Abstract

PT Bhumi Rantau Energi is a coal mining company in Indonesia located in South Kalimantan, Indonesia. As a mining company, one of the obligations that must be carried out is land reclamation so as not to cause environmental damage. Land reclamation is carried out by planting tree seeds on ex-mining land. The stages of the process for land reclamation are Top Soil excavation. Top soil is the top layer of soil that contains the most nutrients and has the most air content among other soil layers. The excavated top soil will be spread over the ex-mining land that has been provided for reclamation. The purpose of this study is to determine the productivity, number of heavy equipment and also the costs that will be incurred for the Top Soil and Spreading excavation activities. As for determining the minimum cost, it can be analyzed using mathematical programming techniques, one of which is linear programming using the simplex method. This technique is very useful in finding the best solution for a function with more than two variables under the given constraints. Linear programming is a mathematical method that allocates limited resources to achieve a goal such as maximizing profits and minimizing costs. The research method used is a quantitative method. From the results of the study, it was found that for Top Soil and Spreading work for 8 months, 2 Excavator Units with Productivity of 182.25 m³/hour, 2 Bulldozer Units with Productivity of 181.56 m³/hour, 9 Dump Truck Units with Productivity 39.94 m were needed. /hour and 1 Motor Grader Unit with Productivity of 16,128 m²/hour, then the cost incurred for the work is Rp. 18,017,984,600.