Silver going up a few hundred percent wouldn't be enough to stop tomahawk production on a cost basis, however, they'll have political and economic reasons not to drive silver up that much. They may be able to get by purchasing silver as needed, however they intend to increase tomahawk production six-fold (not to mention all their other munitions that use silver). There's also no way they'll be able to replenish their stockpile without jacking the economy.