High levels of mercury concentrations were found in the hair and blood samples ofthe miners and other affected people as well as in fish, soil sediments and forest and river ecosystems in small-scale gold mining areas of the Amazon region. In the Philippines, several studies also looked into mercury pollution based on the experience in Diwalwal, the largest small-scale mining site in the country (e. g. Mahinay et al. 1998, Bacani et al. 1996, Breward 1996, Balce and Cabalda 1992, Williams et al. 1995). High levels of mercury pollution were found on-site as well as in the affected places downstream.
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