Vista Gold Corp. has lodged its latest feasibility study technical reports for the Mt Todd gold project in Australia’s Northern Territory, marking a key milestone toward the development of what is considered the country’s largest undeveloped gold resource.
The submissions provide detailed economic and technical assessments of a planned 15,000 tonne-per-day (tpd) operation.
The company confirmed that it has filed both U.S. and Canadian compliant reports.
A Technical Report Summary was prepared under Item 1300 of Regulation S-K (S-K 1300) and lodged with the U.S. Securities and Exchange Commission’s EDGAR database on September 11, 2025.
A companion technical report, compliant with Canada’s National Instrument 43-101 (NI 43-101), was filed the same day on SEDAR+.
The two reports, aligned with the updated feasibility study results released on July 29, 2025, present comprehensive mineral resource and reserve estimates for Mt Todd. Each reflects the reconfigured 15 ktpd mine plan and confirm robust project economics.
The S-K 1300 document carries the title “S-K 1300 Technical Report Summary – Mt Todd Gold Project – 15 ktpd Feasibility Study – Northern Territory, Australia” and maintains an effective date of July 29, 2025.
The NI 43-101 report, dated September 11, 2025 with the same effective date, carries a parallel title.
Vista’s July announcement outlined strengthened project parameters resulting from the downsized design.
Adjusting from the originally modelled 50 ktpd operation to 15 ktpd, the feasibility study demonstrated improved capital efficiency and a construction scope more feasible under current market conditions.
The updated mineral reserve and resource estimates confirmed that Mt Todd remains a large-scale, long-life opportunity.
The filings now provide regulators and investors with a detailed and independently verified technical base.
Both reports have been posted to Vista’s corporate website for investor review in addition to the EDGAR and SEDAR+ databases.
All scientific and technical content supporting the reports has been reviewed and approved by Vista’s Director of Projects and Technical Services, Maria Vallejo, P.Eng., FAusIMM.
As a Qualified Person under both S-K 1300 and NI 43-101 frameworks, Vallejo confirmed the data and conclusions meet both US and Canadian reporting standards.
Vista stated it continues to follow the Canadian Institute of Mining (CIM) Best Practices Guidelines in conducting, documenting and presenting its work at Mt Todd.
The company emphasised that this rigorous governance strengthens the reliability of the feasibility results.
Located 250 kilometres south of Darwin, the Mt Todd deposit is considered the largest undeveloped gold project in Australia.
Vista has been advancing the project for over a decade, navigating permitting milestones and environmental approvals while refining its operating scenarios.
The latest feasibility study represents a shift toward a scalable, cost-competitive mine design prioritising capital discipline in a challenging financing environment.
With the technical submissions completed, market attention now turns to Vista’s potential development pathway.
The company has positioned Mt Todd as a shovel-ready project, with the feasibility framework intended to support financing discussions and options for partnership with major producers.
The filing of the dual reports underscores Vista’s dual-listed status on the NYSE American and the Toronto Stock Exchange, ensuring compliance with both U.S. and Canadian disclosure standards.
Investors will now have access to a harmonised set of project data at a time when gold companies are under pressure to advance high-quality, de-risked development projects.