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.
Miners knew that the birds would be killed by the water
( z1 know :ARG0 ( z2 person :ARG0-of ( z3 mine ) ) :ARG1 ( z4 kill :ARG0 ( z5 water ) :ARG1 ( z6 bird ) ) )