More than 6,400 migratory birds and other animals were killed in Nevada by drinking water in the cyanide-laced ponds produced by gold mining operations.
he poisoned water came from human activities from mining
( z1 come :ARG1 ( z2 poison :ARG0 ( z3 he ) :ARG1 ( z4 water ) ) :ARG2 ( z5 activity :ARG0 ( z6 human ) :ARG1 ( z7 mine ) ) )