Assertion: reef's mine | /r/CapableOf | discharge heavy metals
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Source sentences:
text: In Papua New Guinea, mines discharging heavy metals caused a decline in coral density, extension, calcification, and tissue layer thickness (Barnes and Lough, 1999; Fallon et al., 2002), and some metals like Zn and Pb remain in reefs many years after mining ceases (Fallon et al., 2002).