Business Context and Reporting Period
Company: I-80 Gold Corp.
Filing Type: Form 8-K (Current Report)
Date of Report: December 18, 2025
Subject: Update on the refurbishment of the Lone Tree Plant in Northern Nevada, including engineering study results, capital cost estimates, and development timelines.
Key Financial Metrics and Project Economics
Capital Cost Estimates (AACE Class 3):
- Total Project Cost: $430 million (US)
- Direct Costs: $253 million
- Indirect Costs: $91 million
- Contingency (~12%): $43 million
- Owner's Cost: $25 million
- Capital Spares: $18 million
Operational Capacity:
- Autoclave Throughput: Up to 2,268 tonnes per day
- Annual Throughput: 827,806 tonnes (based on 85% availability)
- Feed Source: Refractory material from Granite Creek, Archimedes, and Cove mines.
Financial Performance Metrics: The filing text does not provide specific values for revenue, profit, cash flow, margins, debt, or liquidity for the reporting period. The document focuses on project capital costs and engineering estimates.
Material Changes and Project Updates
Engineering Study Results:
- Design Upgrade: Conversion of the existing autoclave circuit to a modern Pressure Oxidation (POX) circuit using an acid-based process to improve gold recovery rates.
- Environmental Compliance: Addition of a tailings filtration system to replace conventional storage, enabling water recirculation and reducing closure costs. New mercury abatement circuit and oxygen plant design included.
- Cost Variance: The estimated cost of $430 million is modestly higher than the previously anticipated $400 million due to inflation, detailed engineering, and expanded capacity for the filtered tailings system.
Operational Flexibility:
- The plant can bypass the POX circuit for high-grade oxide material, potentially increasing throughput by 5% to 10% above nameplate capacity.
Guidance, Outlook, and Risks
Timeline and Next Steps:
- Permitting: Engineering designs expected to be completed in Q4 2025; permit applications projected for submission in Q1 2026.
- Construction: Demolition expected to commence in Q2 2026, followed by construction in H2 2026, contingent on financing and permit approval.
- Commissioning: Expected to begin in Q4 2027.
- Interim Plan: Prior to commissioning, refractory material from Granite Creek and Archimedes will be processed via a third-party toll-milling agreement.
Management Commentary:
- The refurbishment aims to create a central hub for processing, advancing the company toward becoming a mid-tier gold producer.
- The study highlights a material increase in margins and a short payback period, though specific figures are not disclosed in this text.
Risks and Contingencies:
- Regulatory: Approval of new permits for air quality, water pollution, and reclamation remains outstanding.
- Financial: Construction is dependent on the completion of recapitalization and required financing.
- Forward-Looking: Statements regarding timing, costs, and production are subject to significant uncertainties, including commodity price changes, regulatory delays, and execution risks.
Investor Verification Checklist
- Capital Funding: Verify the status of the recapitalization plan required to fund the $430 million project.
- Permitting Status: Monitor the submission and approval of environmental permits in Q1 2026.
- Cost Inflation: Assess the impact of the $30 million cost increase over previous estimates on project economics.
- Third-Party Agreements: Review the terms of the toll-milling agreement for interim processing and the over-the-fence oxygen supply contract.
- Technical Definition: Note that the study is a Class 3 engineering cost analysis, not a full feasibility study or technical report under NI 43-101.