He found it with a metal detector in Australia.
From The BBC…
“I have been a prospector and dealer for two decades, and cannot remember the last time a nugget over 100 ounces (2.8kg) has been found locally,” said Cordell Kent, owner of the Ballarat Mining Exchange Gold Shop.
It was buried about two feet deep, and is worth about $315,000. You can see it shown off on YouTube; it has a very weird shape (and looks nothing like the stock photo at right).