Joseph Charles Viola, 29, pleaded guilty in the District Court to six charges of stealing the items, worth a total of $55,000 and including a limited edition Kimberley sunrise coin, between February and April 2016.
He was caught after an audit was conducted by the Mint’s security, which revealed five gold bars and eight gold coins were missing from a vault.
CCTV footage was then reviewed which showed Viola taking a gold coin from a vault, hiding it in a computer tower and then transferring the coin into his trouser pocket, before leaving the Mint at the end of his shift.
Further investigations revealed that on a number of occasions, Viola had sold other coins and gold bars from the Mint to a gold bullion dealer across the road, and had received payments in excess of $50,000.
They included a 10-ounce gold cast bar valued at more than $15,500 and the 2-ounce Kimberley Sunrise coin which was worth almost $7,000.