IMPORTANCE OF THIN SEAMS RECONCILIATION IN A NEW COAL MINING PROSPECT AREA

Coal thin seams in the coal mining industry are often considered by company as waste material or it is not gives a significance revenue. Actual condition it is true but this seams actually can be mined potentially and giving some additional profit if we do the plan and managed it correctly. In this paper will discuss and explaining about how much the importance related to optimalization of coal thin recovery in coal mining industry in the technical and economical perspectives. Starting on the iso-thickness polygon in the pit shell design that have been agreed (sign off) to coal reserves reconciliation that had mined completely. The Geologist must undertakes monthly monitoring about the sum of coal thin seams and it is variance between actual versus model. If they find loses indication, they must to do investigation immediately. The writer take a study case from one of area’s PT Arutmin Indonesia consession. The located of research area is situated in “Pit 4 Spessartine” with the coal thin seams succession from interval delta lower 2 – echo 1 lower. The Stratigraphy of research area is a part of Warukin Formation – Asem Asem Sub Basin. If we look in the engineering, mine scheduling, operational sequence and also marketing linkage perspectives, actually these thin seams gives a much economical profit but on the other hand it can gives a loss material such as coal contamination and increasing of ash content. In this paper the writer also reviewing the geological perspective so it can be known about the general parameters which controlled about coal sedimentary deposited among of them. We will disclose the paleo-peats distribution, paleo-base of their wet land or marsh and the last one is knowing about the water currents within the coal depositional environment.