Green Bridge Metals Finds Copper Sulfide Signs in Minnesota Duluth Complex Drilling

All three holes Green Bridge Metals drilled into the Titac South deposit in northeastern Minnesota returned the same early signal: visible copper sulfide mineralization stretching across intervals up to 450 metres downhole. The Vancouver-based junior explorer announced the Phase 1 results March 26, framing them as early confirmation that its geological models are pointing in the right direction.

The company drilled holes TS26-002a (309 metres), TS26-003 (410 metres), and TS26-005 (477 metres) at the Titac Project, located within the Duluth Complex in the South Contact District of St. Louis County, after commencing the program in late January 2026. Combined, the three holes account for 1,196 metres of core and represent half of a planned six-hole fence designed to map copper mineralization across the intrusion.

Geological loggers identified chalcopyrite, a copper-iron sulfide, occurring as disseminations and veinlets throughout the core. Ilmenite, the titanium-bearing mineral that anchors the existing Titac South titanium dioxide resource, was also present in each hole. Chief Geologist Ajeet Millard described the result as validation of the targeting strategy. "The visual observations from the first three holes at Titac South are consistent with the geological and geophysical model that guided our targeting," Millard said. "These preliminary observations provide support to the interpretation that copper mineralization may be spatially associated with the titanium-bearing host intrusion."

Visible sulfide is not a mine. Green Bridge's own disclosure notes that inferred mineral resources carry "a great amount of uncertainty as to their existence and as to whether they can be mined economically." All mineral identifications remain subject to laboratory assay confirmation; samples have shipped to an independent lab with grades and metal content still undetermined. That gap between promising core and economic ore has proved wide in the Duluth Complex before. NorthMet, the PolyMet project, spent more than two decades in permitting before clearing a major regulatory milestone in 2022, and it still faces legal challenges. Twin Metals, targeting the Maturi deposit near Ely, has been in some stage of study or development since the 1960s.

If Green Bridge's assays do confirm meaningful copper grades, the Titac Project's location in St. Louis County carries real economic stakes. Comparable-scale Duluth Complex projects have projected hundreds of direct mining positions and tens of millions of dollars annually in state and local tax revenues, with spinoff effects reaching local contractors, equipment suppliers, and Iron Range service businesses. Exploration drilling alone channels spending into the regional economy through fuel, lodging, and equipment rental.

The three remaining holes in the planned fence will add critical data before any resource modelling can advance. After assays return, the company would need updated technical reports, additional financing, and engagement with Minnesota's mining permitting framework, a process that historically runs years. The assay results are the next concrete gate, and until those numbers arrive, Titac South is exactly what March 26 confirmed: a geologically consistent target still waiting for the chemistry to catch up.