The deaths of 27 people in abandoned mineshafts in Kalimantan from 2011 to 2016 should never have happened. Mine owners should have carried out their obligations to reclaim, or refill pits and replant vegetation over them once mining operations cease.

The fact is these mineshafts and pits were left unfilled and uncovered. They filled up with rainwater, turning them into huge lakes full of metallic sediment and coal remnants. A mining agency sate