Geology and the effect of compaction on base material disposal for the stability of coal disposal slopes in South Kalimantan, Indonesia

Abstract

A mining activity generally removes overburden to extract minerals. Therefore, a certain area is needed to place the overburden material. One of the parameters that can affect the stability of the disposal is the base or the foundation of the disposal area which will later be stockpiled. This study is observe influence of base disposal to the stability of slope. Based on the lithological characteristics and observations of the outcrop, the writer arranges the stratigraphy of the study area in order to determine the stratigraphic arrangement and the distribution of the rock units laterally. In general, the study area is dominated by quartz sandstone, claystone, conglomerate and loose material from older rocks. The stratigraphic sequence of the study area from old to young includes Warukin Sandstone Unit (Tmw), Dahor Layang Member Conglomerate (TQdt) and Dahor Sandstone Unit (TQd). In general, the research area is included in the structural landform unit with geomorphological control that influences the tectonic process (endogenous). Based on the results of the study, there was a significant increase related to the stability of the coal disposal slope with compaction efforts carried out on the base material.