Level of Competency in Evaluate Environmental Impact Since the Implementation Good Mining Practice – A Case Study of Orebody with the Complexity of Geometallurgy

Abstract

Implementing strategies that meet green mining requirements has become mandatory for coal and mineral operators in Indonesia. The government of Indonesia through the DEMR (Directorate of Energy, Coal and Mineral Resources) has establish the good mining practise (GMP) as one of essential reference to conduct mining activities in safest way, healthy and less of environmental harm. To be able achieve this target for implementation GMP, it will require individual and organizational maturity with a certain level of competencies to working through all the stage processes of the mining. Starting from the stage of conceptual design, development-construction, production up until final stage of mine closure. The aspect of geometallurgy and its impact from side of environmental by extracting the mine orebody will call for collaboration within the different of discipline and knowledge background ensure a good decision can be made. Having an orebody at complexity of geometallurgy may need some specific requirements of mine infrastructure enable mineral extraction and ore dressing activities at the mill site to be conducted in efficient, safest and low environmental harm.
The sulphide orebody presenting multiple type of rocks at the numerous geochemical aspect who will further risk our environment at improperly handle them through the mining process. Content of high pyrites in the orebody could generate the large amount of rock acid and suffering the environment on directly release it into river. Therefore, engineering and designing of the mine along requirement infrastructures and determination of best operation scenario for properly handling the pyrites as part of extraction mineral process activities become more essential to the business. This written paper aiming exercise the complexity of geometallurgy at the Grasberg District orebody Freeport Indonesia and its determination solution for mineral extraction activities with the collaboration among different of knowledge background geologist, mining, metallurgy, environmental, economic-accounting and several others. Part of exercise to also look into the needs of level competencies along with the assessment on current availability of formal educational course supporting these requirements.
Study and evaluation are being conducted through the system dynamic simulation methodology by reviewing effectiveness of process on each activity of the mining. In analyst the scenario 3 under the system dynamic simulation, it founded large of deviation at number of actual wet drawpoints compared to the plan. The plan mismatch is also extended to the volume of pyrites delivers into the mill facilities. While geotechnical aspect seems to be in well managed, the green mining concept and the GMP implementation perspectives remain on gaps that is look for improvement considering an ideal composition of skill.