Engineering concept for reclamation on land use of abandoned alluvial tin mine as a solution to achieve sustainable post-mining

Abstract

Hundreds of abandoned tin mines ponds in Bangka Belitung Province are not reclaimed properly during the post-mining activities. Reclamation in the former mining area ideally is a series of ongoing activities with planned post-mining activities. Planning for reclamation of abandoned tin mines or that has been re-mined by the community is a challenge to represent a concrete manifestation of sustainable management in the Indonesian mining sector to fulfill Government Regulation No. 78/2010 and the Minister of Energy and Mineral Resources Decree No. 1827/2018. This study purposes are to formulate the concept of the sustainable reclamation for the alluvial tin mines. Studies that have been conducted are to portrait topographic area by using drone, then followed by hydrology and hydrogeological mapping, infiltration and pumping test, shallow drilling and geohazard study. Air photo using drone can be used for topographic mapping. Ground water flows from the upper part area to central low land area which represents a river with low gradient. Three geohazards are identified such as flood, erosion and minor landslide. Based on the identified geohazards, the detail design of building ditch, sediment trap and reshaping landform are prepared carefully for the alluvial environment.