Henry Dole, the miner credited with finding the gold, said "Never in my life have I seen anything like this".
Speaking with ABC News, geologist Zaf Thanos heralded the discovery as remarkable, telling the news organization that most gold discoveries in mines across the world are only visible under a magnifying glass.
The second largest piece of rock they recovered contains an estimated 1,620 ounces of gold.
The other rock is anticipated to be worth CA$2.6mn (US$1.98mn), as it weighs 63kg and holds approximately 1,620 ounces of gold.
The Kambalda resident has been in the profession for 16 years and says he has never seen anything like it.
The company said that this is a very rare find.
"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 percent premiums apply here", he said. "These discoveries highlight the high-grade gold potential of Beta Hunt", he added.
RNC's Australian subsidiary Salt Lake Mining uncovered a museum-grade specimen from the Hand of Faith area at Beta Hunt two years ago, and just two months ago RNC pulled 1500oz of coarse gold from an area near last week's find.
It is not the first time Beta Hunt, which has been mined for nickel since it opened in 1973, has produced high-grade finds in its renaissance as a gold operation. "There were chunks of gold in the face, on the ground, truly unique I reckon", according to the ABC news report.
The company put the mine up for sale in March, but it has now chose to expand its horizons beyond the current exclusive discussions with a preferred bidder.
Given the significance of this discovery to the exploration potential and value of Beta Hunt for RNC shareholders, as a result of the discovery and related developments, RNC is no longer in exclusive discussions with a preferred bidder for Beta Hunt.
A handful of gold rocks could be worth several thousand dollars, so security has been beefed up in the days since the find.
He said the real question, unanswerable without more information, is whether the gold comes from a vein that will quickly "pinch out or whether it stays wide".
Armed guards have been transporting the gold to a secure vault. "We're really looking forward to auctioning the key stones off over the coming weeks".