# SEC Link: S-K 1300 Technical Report Summary Source Brief: https://evesgoldminers.com/research/source-briefs/vista-gold-2025-09-11-sec-link-s-k-1300-technical-report-summary-4d1d2331 Original source: https://vistagold.com/images/mttodd/Mt_Todd_FS_S-K_1300_Report_Master_Rev_0.pdf Original published: 2025-09-11 EGM generated: 2026-09-04 Company: Vista Gold (VGZ) ## Use Note This is the Eve's Gold Miners normalized Markdown copy of an official or regulatory public source. It is provided for readability, search discovery, and research resilience. The original source remains authoritative for legal, regulatory, and investment decisions. ## Extracted Document Text # SEC Link: S-K 1300 Technical Report Summary Source: https://vistagold.com/images/mttodd/Mt_Todd_FS_S-K_1300_Report_Master_Rev_0.pdf Published: 2025-09-11T00:00:00+00:00 Fetched: 2026-05-05T09:40:10.542+00:00 Source artifact: 4d1d2331-2a0e-4c41-867f-9043d98d4662 Normalizer input: text ## Content # SEC Link: S-K 1300 Technical Report Summary S-K 1300 TECHNICAL REPORT SUMMARY Mt Todd Gold Project │ 15 ktpd Feasibility Study Northern Territory, Australia << CHANGE PICTURE >> Effective Date: July 29, 2025 Project No. 13028 Issue Date: September 11, 2025 S-K 1300 Technical Report Summary Mt Todd Gold Project | 15 ktpd Feasibility Study Northern Territory, Australia Project Number: 13028 Effective Date: July 29, 2025 Report Date: September 11, 2025 Prepared for: Prepared by: Vista Gold Corp. GR Engineering Services Limited 8310 S. Valley Hwy., Suite 300 71 Daly Street Englewood, CO 80112 Ascot, Western Australia 6104 P +1 (720) 981-1185 P +61 8 6272 6000 Qualified Persons: Amy L. Hudson, CPG, SME RM April Hussey, P.E. Brad Bijold,P.E Brendan Mulvihill, MAusIMM (CP Met), RPEQ Colin McVie, FAusIMM Deepak Malhotra, SME RM Justin Knudsen, P.E Keith Thompson, CPG, P.G member AIPG Kira Johnson, MMSA Marthinus Sonnekus, MAusIMM(CP), RPEQ. Peter Lock, FAusIMM Vicki J. Scharnhorst, P.E., LEED AP Vista Gold Corp. S-K 1300 Technical Report Summary Mt Todd Gold Project │ Northern Territory, Australia 15 ktpd Feasibility Study Reference: 13028 6530266:P:wa Revision 0 Page ii FORWARD-LOOKING STATEMENTS This Technical Report Summary contains forward-looking statements within the meaning of the U.S. Securities Act of 1933, as amended, and U.S. Securities Exchange Act of 1934, as amended, and forward-looking information within the meaning of Canadian securities laws. All statements other than statements of historical facts included in this Technical Report Summary that address future activities, events, developments, or outcomes that we or others expect or anticipate will, may, or may not occur in the future, are forward-looking statements and forward-looking information. Forward-looking statements and forward-looking information include, but are not limited to statements regarding such things as: estimates of Mineral Resources and Mineral Reserves; the gold price and other inputs used to estimate Project output and performance, Project design and availability of required approvals; timing or ability to complete any activity as set forth herein; annual and cumulative gold production at estimated recovery rates over the life of mine; mining methods and procedures; processing methods and procedures; projected Project economics, including but not limited to anticipated production and revenue, cash costs, royalty payments, government royalties and taxes payments, other payments that may or may not have been contemplated, after-tax NPV, IRR, non-U.S. GAAP measures and any other monetarily derived value; and other such matters are forward-looking statements and forward-looking information. Among the material factors and assumptions used to develop the forward-looking statements and forward-looking information contained in this Technical Report Summary include: the accuracy of test work and interpretation of results used to prepare this Technical Report Summary, Mineral Resources and Mineral Reserves estimates, and exploration findings and assay results; the terms and conditions of the Company’s agreements with third-parties; Vista’s approved or expressed business plans; the anticipated timing and completeness of approvals and permissions; the potential occurrence of certain threatened species of flora, vegetation, and fauna within the mine site; no change in laws that materially impact mining development or operations of a mining business; the potential occurrence and timing of a formal investment decision; the anticipated gold production at the Project; the life of any mine at the Project; all economic projections relating to the Project, including estimated cash costs, all-in sustaining costs, NPV, IRR, initial and sustaining capital requirements, reclamation and closure costs, and self-funding reclamation proceeds; and Vista’s objective to advance the Project to be a producing gold mine. When used in this Technical Report Summary, the words and derivatives of words such as “optimistic”, “potential”, “indicate,” “expect”, “intend”, “plan”, “believe”, “may”, “will”, “if”, “anticipate”, and similar words or expressions that reference or imply future conditions are intended to identify forward-looking statements and forward-looking information. Statements that include such words or expressions reflect known and unknown risks, uncertainties and other factors that may cause actual results, performance or achievements of Vista to be materially different from any future results, performance or achievements expressed or implied by such statements. Such factors include, among others, uncertainty of Mineral Resources estimates, estimates of results based on such Mineral Resources estimates and Mineral Reserves estimates; risks relating to cost increases, scope changes, and consumption requirements for capital and operating costs; risks related to the timing and the ability to obtain the necessary permits, risks of shortages and fluctuating costs of equipment or supplies; unforeseen delays; risks relating to fluctuations in the price of gold and foreign exchange rates; the inherently hazardous nature of mining-related activities; potential effects on Vista’s operations of applicable and influencing environmental and other regulations; risks due to legal proceedings; risks relating to political, social, and economic instability; as well as those factors discussed under the headings “Note Regarding Forward-Looking Statements” and “Risk Factors” in Vista’s Annual Report Form 10-K as filed in February 2025 and other documents filed with U.S. Securities and Exchange Commission and Canadian securities regulatory authorities. Vista Gold Corp. S-K 1300 Technical Report Summary Mt Todd Gold Project │ Northern Territory, Australia 15 ktpd Feasibility Study Reference: 13028 6530266:P:wa Revision 0 Page iii Although Vista has attempted to identify important factors that could cause actual results to differ materially from those described in forward-looking statements and forward-looking information, there may be other factors that cause results not to be as anticipated, estimated or intended. Except as required by law, Vista assumes no obligation to publicly update any forward-looking statements or forward-looking information, whether as a result of new information, future events, or otherwise. Vista Gold Corp. S-K 1300 Technical Report Summary Mt Todd Gold Project │ Northern Territory, Australia 15 ktpd Feasibility Study Reference: 13028 6530266:P:wa Revision 0 Page iv TABLE OF CONTENTS 1. EXECUTIVE SUMMARY ............................................................................................................... 1 1.1 Overview ....................................................................................................................................... 1 1.2 Property Description and Location............................................................................................. 1 1.2.1 Topography, Elevation, and Vegetation ....................................................................................... 5 1.3 Geology and Mineralization ......................................................................................................... 5 1.4 Mineral Resource Estimates ....................................................................................................... 6 1.5 Exploration ................................................................................................................................... 6 1.6 Mineral Reserve Estimates .......................................................................................................... 7 1.7 Mining Methods ............................................................................................................................ 8 1.8 Mineral Processing and Metallurgical Testing........................................................................... 9 1.9 Project Infrastructure ................................................................................................................. 11 1.10 Market Studies and Contracts ................................................................................................... 12 1.11 Environmental Studies, Permitting, Social and Community Impact ...................................... 12 1.11.1 Environmental ............................................................................................................................ 12 1.11.2 Human Environment................................................................................................................... 13 1.11.3 Potential Emissions, Waste, and Effluents Generated by the Project ........................................ 13 1.12 Capital and Operating Costs Estimates ................................................................................... 14 1.12.1 Capital Cost ................................................................................................................................ 14 1.12.2 Operating Cost ........................................................................................................................... 15 1.13 Economic Analysis .................................................................................................................... 15 1.14 Conclusion.................................................................................................................................. 16 2. INTRODUCTION .......................................................................................................................... 18 2.1 Purpose of the Technical Report Summary ............................................................................. 18 2.2 Previous Technical Report Summaries .................................................................................... 19 2.3 Background Information............................................................................................................ 19 2.4 Detailed Personal Inspections .................................................................................................. 19 2.5 Capability and Independence .................................................................................................... 21 2.6 Reliance on Other Experts ........................................................................................................ 21 2.7 Sources of Information and Data .............................................................................................. 21 2.8 Units of Measure ........................................................................................................................ 21 3. PROPERTY DESCRIPTION ........................................................................................................ 22 3.1 Location ...................................................................................................................................... 22 3.2 Land Tenure................................................................................................................................ 22 3.3 Lease and Royalty Structure ..................................................................................................... 23 3.4 Ownership................................................................................................................................... 24 Vista Gold Corp. S-K 1300 Technical Report Summary Mt Todd Gold Project │ Northern Territory, Australia 15 ktpd Feasibility Study Reference: 13028 6530266:P:wa Revision 0 Page v 3.5 Risks ........................................................................................ 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