Shallow cover over coal mining: a case study of subsidence at Kamptee Colliery, Nagpur, India.

Abstract  Shallow land cover over old underground workings at Kamptee Colliery has led to the development of ground collapse, with three crown hole subsidences recorded in a 10 year period. As the land above the workings has been developed, it was considered that for safety purposes areas with less than 15 m of competent rock should be established. The paper discusses the Multi-electrode Resistivity Imaging (RI) and Ground Penetrating Radar (GPR) undertaken over an area of 800 m � 200 m, which indicated that where a competent cover was present it was very thin. [ABSTRACT FROM AUTHOR]