Sluice mining, locally called banlas, is a destructive method banned by the provincial government. Employing high-pressure water jets to dislodge or move sediments, it has a devastating effect on the
environment including siltation and mercury contamination.
environment including siltation and mercury contamination.
Flaviano said that banlas operations are still rampant in the mountains of Tampakan, touted as the largest known undeveloped copper-gold deposit in Southeast Asia.
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