ARIS MINING ANNOUNCES POSITIVE PEA RESULTS FOR THE TOROPARU GOLD PROJECT

PEA confirms long-life, low-cost open pit gold operation in Guyana with 25.2% IRR and $1.8 billion after-tax NPV_5% at $3,000/oz gold

VANCOUVER, BC, Oct. 28, 2025 /CNW/ - Aris Mining Corporation (Aris Mining or the Company) (TSX: ARIS) (NYSE-A: ARMN) announces positive results from the recently completed preliminary economic assessment (PEA) of its 100%-owned Toroparu Gold Project (Toroparu or the Project) in Guyana. The PEA confirms Toroparu as a large-scale, long-life open pit gold project with robust economics -- 21.3-year mine life, 235 koz of average annual gold production, and $1.8 billion after-tax NPV_5% at $3,000/oz gold. The full PEA report is available on the Company's website and SEDAR+ profile at www.sedarplus.ca and is filed with the U.S. Securities and Exchange Commission (SEC) at www.sec.gov. All amounts are in U.S. dollars unless otherwise indicated.