Waste in the ponds produced by leaching gold from ore is a source of potential environmental dangers.
A fallen satellite can be another potential environmental danger.
( z1 possible :ARG1 ( z2 endanger :ARG0 ( z3 satellite :ARG1-of ( z4 fall ) ) :ARG1 ( z5 environment ) :mod ( z6 potential ) :mod ( z7 another ) ) )