Factorio Forums

It look like the best way to make silver is from silver:
The Nitrogen dioxide gas needs some aluminium (0.04), silver (0.04), copper (0.02) and iron ore (0.02) so it isn't completely free. But 0.12 ore give 6 silver ingots. That's pretty efficient.

Removing the modules from the silver nitrate from silver plate recipe would greatly reduce the efficiency. But if the silver nitrate from silver plate recipe is to remain then the casting machines can't accept productivity modules or this loop would always be there.

Since I don't want the casting machines to loose their productivity modules but also think the above loop shouldn't be possible might I suggest removing the silver nitrate from silver plate recipe? That would leave the silver nitrate from processed silver recipe and break the loop.

That's the bobs recipe which should be disabled. Will remove it for the next update.