The damage is a consequence of the use of machines such as excavators and backhoes to dig out the soil containing gold deposits. Mercury was used to process the gold from ore. Mercury contamination in the three biggest rivers in Central Kalimantan continues to exceed the safety threshold of 2000 micrograms per litre of water mandated by Government Regulation No. 82/2001 on Management of Water Quality and Pollution. In 2008, mercury contamination in Barito River reached 5519 micrograms, 4687 micrograms in the Kahayan River and 7029 micrograms in the Kapuas River. In 2014, a local newspaper reported that the contamination was still high in those rivers.
read more... http://www.insideindonesia.org/small-scale-mining-in-central-kalimantan
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