Regis Resources (ASX:RRL) said that net of depletion underground ore reserves have grown by 268% since 2018 at its Tropicana joint venture (JV) in Western Australia, according to a Monday filing with the Australian bourse.
The company reported mineral resources of 5.4 million ounces and ore reserves of 1.9 million ounces, as at Dec. 31, 2025, at the JV, the filing said.
Underground measured and indicated mineral resources rose to 2.5 million ounces in 2025 from 2.2 million ounces in 2024, the filing added.
Shares of the company rose 2% in recent Monday trade and earlier hit an over 18-year high.