Geopolitical Mining Daily · October 7, 2026
Brazil · Lithium · Mining Operations Resume After Federal Court Decision
Sigma Lithium has resumed mining and industrial operations in Brazil after a Federal Court of Appeals maintained the validity of its environmental licences. StrikePoint has completed the Northumberland gold acquisition in Nevada; Aclara has expanded the separation scope of Project Dynamo in the United States; Canagold has produced physical antimony metal from New Polaris concentrate; Canterra has expanded the Lundberg indicated copper zinc resource in Newfoundland; and Codelco has ordered an independent audit after preliminary production accounting inconsistencies were identified in Chile.
Sigma Lithium announced the resumption of mining and industrial operations after a Federal Court of Appeals maintained the validity of its environmental licences. StrikePoint Gold completed the acquisition of Northumberland from Newmont and paid US$70 million at closing. Aclara expanded Project Dynamo to include yttrium, gadolinium and samarium separation and began installing additional solvent extraction circuits at its Virginia Tech demonstration plant. Canagold reported production of physical antimony metal grading above 99% from New Polaris concentrate during metallurgical test work. Canterra increased the Lundberg Indicated Mineral Resource by 55% to 26.08 million tonnes. Codelco commissioned a new independent external audit after preliminary inconsistencies were identified in production accounting between the Salvador and Ministro Hales divisions.
The GM observation framework
The ten Signals
Each Daily uses the same ten strategic lenses. The highlighted dimensions classify today’s six verified developments.
Operating and regulatory milestone
Brazil · Lithium · Mining Operations Resume After Federal Court Decision
What happened
Sigma Lithium announced on October 6 that it had resumed mining and industrial operations at its lithium business in Minas Gerais after a Federal Court of Appeals maintained the validity of the company’s current environmental licences.
The company reaffirmed guidance to reach 330,000 tonnes of annualized lithium oxide concentrate production by the end of 2027 and said its existing mine and Cleantech Industrial Plant capacity are sufficient to support that target.
Primary company distribution
Sigma Lithium: operations resume after Federal Court of Appeals decision.Asset acquisition
United States · Gold · Northumberland Acquisition Closes
What happened
StrikePoint Gold completed its acquisition of the Northumberland Gold Project in Nevada from subsidiaries of Newmont on October 6. StrikePoint paid US$70 million in upfront cash consideration at closing.
The company has also agreed to two future contingent cash payments of US$25 million each, one following completion of a feasibility study and the other after specified commercial production milestones. Conditions for release of the related C$190 million subscription receipt financing were also satisfied on October 6.
Rare earth processing
United States · Rare Earths · Project Dynamo Adds Yttrium, Gadolinium and Samarium Separation
What happened
Aclara Resources expanded the planned scope of Project Dynamo in Louisiana to include separation of yttrium, gadolinium and samarium in addition to neodymium praseodymium, dysprosium and terbium.
Aclara has begun installing additional solvent extraction circuits at its demonstration plant at the Virginia Tech Corporate Research Center. The company is also modifying the basic engineering for the planned industrial scale Louisiana facility, increasing the expected number of mixer settlers from approximately 340 to 478.
Primary company distribution
Aclara Resources: Project Dynamo separation scope expanded.Metallurgical milestone
Canada · Antimony / Gold · New Polaris Produces Antimony Metal Above 99%
What happened
Canagold Resources reported that metallurgical test work on concentrate from the New Polaris gold antimony project produced physical antimony metal grading greater than 99% antimony.
The test program used alkaline sulphide leaching followed by electrowinning. Canagold reported 99.7% antimony extraction during the program, using concentrate previously produced from locked cycle flotation work.
Primary company distribution
Canagold Resources: antimony metal produced from New Polaris concentrate.Mineral resource update
Canada · Copper / Zinc · Lundberg Indicated Resource Increases 55%
What happened
Canterra Minerals announced an updated Mineral Resource Estimate for the Lundberg deposit at the Buchans Project in Newfoundland. Indicated tonnage increased by 55% from the 2019 estimate to 26.08 million tonnes.
The new Indicated resource contains 226.2 thousand tonnes of copper equivalent, including 94.8 thousand tonnes of copper and 341.6 thousand tonnes of zinc, together with lead, silver and gold. The estimate has an effective date of September 2, 2026 and was announced on October 6.
Primary company source
Canterra Minerals: 2026 Lundberg Mineral Resource Estimate.Production accounting and governance
Chile · Copper · External Audit Ordered on Production Accounting
What happened
Codelco announced that its board had been informed of preliminary inconsistencies in production figures for 2024 and 2025 that could have artificially increased reported production at the Ministro Hales and Salvador divisions.
The company said the preliminary issue may involve the same material being recorded as production by more than one division. Codelco commissioned EY to conduct an independent external audit, added the findings to its internal investigations and provided the information to the Public Prosecutor’s Office. KPMG will continue a separate review of division production for 2024 and 2025.
Primary company source
Codelco: independent audit and investigation into production accounting inconsistencies.The Daily records verified changes. The Signals provide the classification map. The Weekly brings the developments together for the deeper system reading.