I was watching world strongest man competition 2018, and there was this "Bullion toss" contest
Those huge men were throwing/tossing 20 kg to 30kg Gold bars 15 feet high. They were solid gold bars or iron bars plated with Gold ??
It would be very silly if someone were throwing 20kg and 30kg Gold bars from a 15ft high.
No competition would have such money to spend in order to make a show like that.
It would be iron bars covered with gold.