8-K: i-80 Gold Updates Granite Creek Pre-Feasibility Study

i-80 Gold Corp. has filed an updated Pre-Feasibility Study (PFS) and Technical Report Summary for its Granite Creek Underground Project, detailing significant mineral resource and reserve estimates.

Summary

• i-80 Gold Corp. has filed an updated Pre-Feasibility Study (PFS) and Technical Report Summary for its Granite Creek Underground Project, with an effective date of March 31, 2026.
• The PFS confirms substantial underground mineral resources and reserves, with Proven and Probable Mineral Reserves totaling 2,198 thousand tonnes at an average grade of 7.87 g/t Au, containing 556.5 thousand ounces of gold.
• The project economics, based on a gold price of $2,750/oz, indicate an after-tax NPV of $118 million.
• The mine life is projected at 8.5 years with average annual gold production of approximately 75,000 ounces during steady-state production (2028-2032).
• The company is ramping up production towards steady-state, with commercial production expected in late 2026.
• Processing of refractory ore will occur at the refurbished Lone Tree Plant starting in 2028, with third-party toll milling arrangements in place until mid-2027.
• The Granite Creek Underground mine is fully permitted, and the company is focused on compliance and reporting requirements.

Sentiment

Score: 7

Explanation: StockSavvy.ai views this as a positive development, indicating progress in resource definition and economic viability assessment for the Granite Creek project.

Positives

• Substantial Proven and Probable Mineral Reserves of 2,198 thousand tonnes at 7.87 g/t Au, containing 556.5 thousand ounces of gold.
• Positive after-tax NPV of $118 million at a $2,750/oz gold price.
• Projected average annual gold production of 75,000 ounces during steady-state production (2028-2032).
• Mine life projected at 8.5 years.
• The mine is fully permitted and currently ramping up production.
• Updated mineral resource and reserve estimates reflect continued exploration success and refined economic parameters.
• Strategic use of third-party toll milling until the Lone Tree Plant is operational, mitigating immediate processing risks.

Negatives

• The project does not generate positive free cash flow in 2026 and 2027 due to higher third-party processing costs and a stockpiling period.
• Cash flow is forecast to be negative at the end of the operational life as the operation winds down and closure costs are incurred.
• The discovery of petroleum-contaminated soil in the CX Pit waste rock backfill may require re-handling of up to 1.17 million tons of waste rock, with unquantified remediation costs.
• The reclamation and closure cost estimate is based on a government cost model and will be revised, potentially increasing future liability.
• Elevated arsenic and antimony in dewatering water require ongoing treatment, impacting operating costs.
• The project's reliance on third-party toll milling until mid-2027 introduces counterparty risk and potentially higher costs compared to in-house processing.
• The Lone Tree Plant refurbishment capital allocation of $49.3 million is a significant cost component.

Risks

• The discovery of petroleum-contaminated soil in the CX Pit waste rock backfill may require re-handling of up to 1.17 million tons of waste rock, with unquantified remediation costs.
• The reclamation and closure cost estimate is based on a government cost model and will be revised, potentially increasing future liability.
• Ongoing management of elevated arsenic and antimony in site dewatering water requires treatment, impacting operating costs.
• The project's reliance on third-party toll milling until mid-2027 introduces counterparty risk and potentially higher costs compared to in-house processing.
• The Lone Tree Plant refurbishment capital allocation of $49.3 million is a significant cost component.
• The economic analysis is sensitive to metal prices, recovery assumptions, and mined grades.
• Future changes in interpretation of deposit geometry, grade continuity, mining/processing costs, metallurgical recovery rates, or geotechnical assumptions could materially affect mineral reserves.
• The project operates within a designated groundwater basin requiring closer administration by the State Engineer, potentially impacting future water rights acquisition.

Future Outlook

The company is ramping up production towards steady-state, with commercial production expected in late 2026. Processing of refractory ore will occur at the refurbished Lone Tree Plant starting in 2028, with third-party toll milling arrangements in place until mid-2027. The PFS outlines an updated mine life of approximately 8.5 years with annual steady state gold production of approximately 75,000 ounces.

Management Comments

• WSP USA Inc. consents to the public filing of the Technical Report Summary by i-80 Gold Corp.
• WSP USA Inc. confirms that it has read the portions of the Form 8-K relating to the parts of the Technical Report Summary for which WSP is responsible, and that such portions of the 8-K fairly and accurately reflect such information.

Industry Context

StockSavvy.ai notes that the updated PFS for the Granite Creek Underground Project aligns with industry trends of advancing resource definition and economic studies for gold projects in Nevada. The company's strategy to utilize third-party processing before its own facility comes online is a common approach to manage early-stage production risks.

Comparison to Industry Standards

• The mining method (underhand drift and fill with cemented waste rockfill) is standard for challenging ground conditions in Nevada, as employed by Turquoise Ridge, Cortez Hills, and Goldstrike.
• Ground support and backfill designs are consistent with regional benchmarks and Golder (2012) recommendations.
• The QA/QC program insertion rates and methodologies align with current industry best practices for S-K 1300 disclosures.
• The use of Chrysos Photon Assay is a modern analytical technique increasingly adopted in the industry for its efficiency and ability to handle larger sample masses, validated against conventional fire assay.
• The economic analysis gold price assumptions ($2,500-$3,000/oz) are within the range considered for similar gold projects, reflecting market consensus and peer company practices.

Stakeholder Impact

• Shareholders: The positive NPV and updated resource/reserve estimates are likely to be viewed favorably by shareholders, potentially impacting share price positively.
• Employees: Continued development and ramp-up of operations will likely sustain or increase employment opportunities.
• Creditors: The PFS results provide updated information for creditors regarding the project's economic viability and repayment capacity.
• Suppliers: Increased operational activity and potential future expansion will likely lead to continued or increased demand for mining supplies and services.
• Local Communities: The company continues stakeholder engagement through town hall meetings and support for local initiatives, indicating a commitment to positive community relations.

Next Steps

• Conduct additional variability sampling for metallurgical testing to further populate recovery models.
• Perform testing to establish head grade and extraction relationships for detailed resource modeling.
• Establish mineralogy impacts and determine geologic domains within each resource for metallurgical testing.
• Conduct testing to provide comminution data to assess hardness variability and impacts on throughput.
• Complete the planned dewatering well and re-evaluate the groundwater model and inflow into underground workings.
• Complete the ongoing metals attenuation study to support site-specific discharge requirements.
• Finalize the post-closure Mag Pit Lake modeling.
• Evaluate securing additional water rights for the Kelly Creek basin.

Key Dates

Recommendation

The updated PFS presents a solid resource and reserve base with a positive NPV, indicating the project's viability. However, the reliance on third-party processing until 2027, the significant capital required for Lone Tree refurbishment, and the ongoing operational ramp-up suggest a 'Hold' recommendation. Further de-risking through operational execution and the transition to in-house processing would be needed to warrant a stronger 'Buy' rating.

Keywords

Granite Creek, Pre-Feasibility Study, Technical Report Summary, Mineral Resources, Mineral Reserves, Gold, Nevada, Mining