Enterprising miners also dig tunnels near river banks which sometimes collapse during rains and trap miners in these rabbit holes underground.
Entrepreneurs in the hills also put up so-called “ball mills” to grind ore and extract the gold using mercury and other toxic chemicals -- resulting to pollution of river water which flows to irrigation field downstream.
http://www.zamboangatoday.ph/index.php/news/13-top-stories/9670-mines-bureau-stops-all-illegal-mining-operations-in-zambo-peninsula-.html
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