I am not sure it would be worth it? can you sell them or the woodstove? I would think they may not be gold,they may be brass? and if gold may be very thin layer,if you do persue the gold, I would test to be sure they were gold plated, if truely gold and it may be hard to get the gold off, with all that Iron, maybe electrowinning in large cell, brine cell, or concentrated H2SO4, would be something to consider.