The feasibility of converting ex-coal mining void into aquaculture in North Kalimantan

Ex-coal mining void has changed landscape shape, physical-chemical, and soil biological properties. As a form of post-mining management, the company must restore damaged land increase its benefits for surrounding community, one which is as freshwater aquaculture area. This study was conducted in 50.26 ha concession area coal PT. Mitrabara Adiperdana (MAP) Malinau Regency, North Kalimantan. The method used by examining physical quality environment laboratory using standards Indonesian Government Regulation (PP) No. 82 2001 22 2021. A also on assessment community acceptance. found that pangasius (<em>Pangasius</em> sp.), snakehead (<em>Channa striata</em>), tilapia (<em>Oreochromis</em> sp.) appropriate to apply location with several notes: reducing concentration suspended solids; content phosphate ammonia, lead (Pb). Regarding these issues, two methods can be used: technology turbine nanobubble natural-based solution through wetland ecosystem basin rehabilitation. At same time, education promotion applied involving communities during piloting demonstration plot process.