Abstract
Indonesia produces over 150million tons of clean coal annually. In Indonesia, most of the coal produced is extracted from opencut mines. Some coal measure rocks are soft in dynamic characteristic and show severely slaking behavior affected by water. Because of tropical rainforest climate, a great variety of problems, such as acid mine drainage, connecting with rock slaking and attendant structural damages have been faced. Accordingly, it is necessary to proceed an effective rehabilitation system which can minimize negative environmental impact of mining activity.This paper describes the slaking behavior of coal measure rocks and the incidence of acid water at Tanjung Enim opencut coal mine in Indonesia. The results shows following highlights: (1) incidence of acid water based on the result of water quality analysis, (2) relationship between the ratio of revegetated area and control acid mine drainage, and (3) slaking behavior of coal measured rocks categorized by NAG test.
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