Trident will pay A$8 million for the royalty, which CEO Adam Davidson said would become a "cornerstone asset" for the company.
Apollo published an MRE for Lake Rebecca of 1.035Moz in February.
Drilling highlights since February included 40m at 5.06g/t Au, 19m at 5.90g/t Au, 12m at 6.73g/t Au and 51m at 2.90g/t Au.
"At this early stage, Trident believes that Lake Rebecca is on track to support a circa 100koz/a operation, located in a desirable jurisdiction being supported by gold prices at close to all-time highs," said Davidson.
Trident debuted on AIM in June with a £16 million initial public offering.
Its first acquisition was a 1.5% FOB revenue royalty on part of the Koolyanobbing iron ore deposit and mine in Western Australia operated by Mineral Resources. This was followed by a 1.25% gross revenue royalty on the Mimbula copper mine in Zambia operated by Moxico Resources, a scaling gold royalty on the Spring Hill gold project in Australia operated by PC Gold, and a portfolio of four exploration and development stage gold royalties in Western Australia from Talga Resources.
