A massive gold nugget has been put up for sale for $1 million.

Gold Nuggets

Gold Nuggets

The Alaska Centennial Gold Nugget weighs in at 21lbs, is over 90 per cent gold and is the size of a child's head. It was discovered by gold miner Barry Clay in 1998.

Clay decided to show the nugget to experts and it was ultimately recorded as the second-largest gold nugget ever found in the Western Hemisphere.

The gold nugget is now set to go under the hammer in Dallas after Clay sold the item to a private collector.

A Heritage spokesperson said: "The Alaska Centennial Gold Nugget is the largest gold nugget ever found in the State of Alaska.

"It was discovered in 1998 along Swift Creek near the town of Ruby, Alaska by Barry Clay, who unearthed this seminal discovery and instantly made history.

"The Alaska Centennial Nugget was sold to a private collector, where it has remained in his collection until now. This offering represents a once-in-a-lifetime opportunity."