The largest specimen weighs in at 90 kilograms and took three men to lift it onto the back of a ute. The quartz rock is covered in an estimated 2,300 ounces of gold worth about $3.8 million at today's gold price. Another 60kg specimen is estimated to contain 1,600 ounces, or about $2.6 million in gold.
The mine's Canadian owners, RNC Minerals, are planning an auction for the large specimens. RNC president Mark Selby said collectors in north America and around the world are known to pay up to a 50 per cent premium on the gold metal value for rare specimens.
"Given the rarity of the rock, and the physical beauty and presentation of the gold that's there, it's a very spectacular stone in multiple ways so we'll see whether 20, 30 or even 50 per cent premiums apply here," he said.
"We're really looking forward to auctioning the key stones off over the coming weeks.
"There's a pretty select group of collectors who this would appeal to.