The main environmental challenges in mining incorporate groundwater and floor contamination of significant metals and due to acid mine drainage, sedimentation of mountain streams, changing groundwater regime, landscape alteration, and ecological disturbance. Land restoration is essential for sustainable mining techniques.15,sixteen Cobalt (Co): The lustrous bluish-grey metallic, a cru... https://preciousmetalinvestments86395.blogdosaga.com/37645964/a-review-of-exchange-traded-funds-etfs