Silver can be produced through the s-process in larger stars and can also be produced in normal supernova through the r-process. The two neutron stars colliding is just an extreme way to get the r-process going.
Unless you plan to hold a cup out on earth while standing in the blast zone of a supernova raining down on you, the semantics of that equation are not so important concerning the mostly closed ecosystem of this planet.
It is possible to synthesize silver with modern equipment, though. Although I concede that the production cost would end up being magnitudes of order greater than any value received. Our civilization would have to be on the Dyson Sphere level to even come close to making that economical.