How much gold was on the SS Central America?

The show on the History Channel said there were 21 tons of gold on the ship. An article on the PCGS site says three tons.
New collectors, please educate yourself before spending money on coins; there are people who believe that using numismatic knowledge to rip the naïve is what this hobby is all about.
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I just glanced through the site, but they mention that "the Central America also held tons of gold ingots, coins, nuggets, and dust."
The tonnage that PCGS may be talking about might simply be in regards to the coins, not the additional ingots, nuggets, and dust.