Analysis of Underground Block Caving Mining Induced Surface Movement in Papua, Indonesia

The occurrence of the surface movement is the main focus of the study regarding to the gold & copper underground block caving mining in Papua, Indonesia. The underground mining has brought some environmental problems on the terrain surface such as the lowering of the elevation followed by growing of the waste pile as the result from the failure of the rock slope. In this study, the surface movements due to the underground mining were analyzed by using the aerial photogrammetry method and the Geographic Information System (GIS) technology. The detected surface subsidence ranging from 1.5 to 2 meter and the development of the sedimentation area has been identified in which the maximum deposit thickness is about 2 meter. In addition, the correlations between extraction thicknesses over the overburden versus ground movement have been studied in order to find out the influence of some geological conditions in the development of the surface changing. The surface movement induced by underground mining causes some serious environmental impact not only above the extraction zones but also the surrounding areas. Some environmental impacts due to the surface movement are reviewed and discussed in this paper in order to describe the current situation of the underground mining in Papua, Indonesia

Analysis of Underground Block Caving Mining Induced Surface Movement in Papua, Indonesia

The occurrence of the surface movement is the main focus of the study regarding to the gold & copper underground block caving mining in Papua, Indonesia. The underground mining has brought some environmental problems on the terrain surface such as the lowering of the elevation followed by growing of the waste pile as the result from the failure of the rock slope. In this study, the surface movements due to the underground mining were analyzed by using the aerial photogrammetry method and the Geographic Information System (GIS) technology. The detected surface subsidence ranging from 1.5 to 2 meter and the development of the sedimentation area has been identified in which the maximum deposit thickness is about 2 meter. In addition, the correlations between extraction thicknesses over the overburden versus ground movement have been studied in order to find out the influence of some geological conditions in the development of the surface changing. The surface movement induced by underground mining causes some serious environmental impact not only above the extraction zones but also the surrounding areas. Some environmental impacts due to the surface movement are reviewed and discussed in this paper in order to describe the current situation of the underground mining in Papua, Indonesia

Human Impacts on Erosion and Deposition in Onga River Basin, Kyushu, Japan

Human disturbances on the ground surface cause erosion and deposition in difference types of landscape. Research on erosion and deposition will understand the magnitude of these impacts in the past and now. In this paper, sediment volume stored in channel for long-term (Holocene) is calculated and erosion model (RULSE) is applied to estimate erosion in short-term (few decades). These values are compared with the one of denudation model established in Japan. As a result, it has clarified that an amount of 47% of total sediment yield from denudation is discharged to the channel for long-term sediment storage in Onga River basin. The RULSE model has indicated that 48% of the total sediment yield comes from erosion processes as sheet and rill erosions, and 52% comes from mass movement such as slope failure. Currently, the sediment yield from forest and agriculture activities is considered to be about 69,000 ton/year which is higher consists of 28% of long-term annual erosion for whole basin