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Transatlantic Mining Corp. (TRRGF) reports exploration developments for a North American precious- and base-metals portfolio centered on Montana and Idaho. Company updates focus on the Miller Mine and Golden Jubilee gold projects in Montana and the Monitor copper-gold project spanning the Montana-Idaho district.
Recurring news themes include drilling and underground access permits, assay and sampling results, NI 43-101 technical reporting, geophysical surveys, dewatering plans, and exploration targeting. Monitor updates also reference copper siderite vein systems, the Anvil prospect, and muon imaging work used to map density anomalies associated with copper mineralization.
Transatlantic Mining (OTC:TRRGF) and Outer Rim Exploration completed a muon imaging survey at the Monitor Copper-Gold Project in Idaho, marking the first North American deployment of ORE's portable muon hodoscope for mining.
The OreScope muon imaging detected the known chalcopyrite-bearing structure and highlighted multiple new high-density anomalies that may represent extensions of the copper mineralized system, supporting future drill targeting and mine planning.
Transatlantic (OTC: TRRGF) provided an exploration update for Miller Mine, Golden Jubilee and Monitor projects in Montana and Idaho on May 5, 2026. Key items: an extended underground drill permit for Jonnie Gulch Adit (up to 12 holes ≈250 m each), surface drilling permits submitted, trucking permits in progress, metallurgy tests planned for Miller stockpiles, and an anticipated NI 43-101 for Miller by Q4 2026. Golden Jubilee planning targets up to 2,000 m in 2–4 holes to 300–400 m. Monitor work follows a trial muon study; a full report is expected shortly.
Transatlantic (OTC:TRRGF) obtained a US Department of Agriculture extension approving the Golden Jubilee Plan of Operation in Granite County, Montana, through December 31, 2026. The permit allows drilling and dewatering; a 2026 program may drill up to 1,000 metres in 2–4 holes to ~300 m depths and test a new geophysical offset target.
Past 2023 results included high-grade intercepts (e.g., 9.1 m at 7.8 g/t Au), supporting follow-up exploration potential.
Transatlantic Mining (TRRGF) reported Phase 1 drill results from the historic Miller Gold Mine, Montana on January 23, 2026. The company completed 25 holes (2,070 m) with highlights including 1.5 m at 6.00 g/t Au and 13.71 g/t Ag (MMRC_2514), 1.5 m at 5.76 g/t Au and 21.94 g/t Ag (MMRC_2504), and a surface sump sample of 0.5 m at 370 g/t Au and 270 g/t Ag. Drilling extended the granodiorite–metasediment contact ~200 m north and ~150 m south; the contact is now intersected over a ~500 m strike. Lower-target underground drilling is deferred to 2026 pending permit extension.
Transatlantic Mining (TRRGF) has begun a maiden technical muon-imaging survey at its Monitor Copper Gold project in Idaho, in partnership with Outer Rim Exploration, announced 15 December 2025. This is the first North American deployment of ORE's portable muon hodoscope for mining.
The battery-powered, passive system images both mineralized zones and subsurface voids without an active radiation source, aiming to map chalcopyrite-rich copper mineralization (previously observed at 0.3 m widths) and historical underground workings to support drill planning and reduce drilling costs. ORE will process data with an AI-driven density-mapping pipeline to produce 2D/3D visualizations to inform Transatlantic's exploration strategy and potential future deployments across North America.
Transatlantic Mining (OTC:TRRGF) filed its maiden NI 43-101 for the Monitor Copper Project (80% JV) on December 1, 2025, defining exploration targets across three copper-siderite veins: Monitor, Richmond and Big Elk. Combined Exploration Target is 1.2–2.9 million tonnes grading roughly 1.2–3.5% Cu with additional silver and gold credits; grades are conceptual and not a Mineral Resource. The company prioritizes a phased program using existing underground access (St. Lawrence tunnel structurally sound to 120m) to enable underground drilling and an optional 10,000-tonne bulk metallurgical sample, followed by property surveys and targeted surface drilling.
Transatlantic Mining Corp. (TSXV: TCO) has secured a permit from the United States Forrest Service for new drilling and dewatering operations at its Golden Jubilee project in Montana, valid through December 1, 2025. The company plans to drill up to 1,000 metres across 2-4 holes to depths of 300 metres.
The program follows successful 2023 drilling results that confirmed mineralization continuation, including notable intersections of 9.1 metres at 7.8 g/t Au and 6.1 metres at 13.1 g/t Au. The new campaign will explore down dip extension, mineralization plunge, and an untested geophysical offset target. The permit also allows for mine dewatering and exploration survey activities.
Transatlantic Mining Corp. (TSXV: TCO) has provided an update on its drilling program at the historic Miller Gold Mine in Montana. The company has completed 2,069 meters across 25 holes of a planned 3,000-meter Phase 1 campaign. The drilling program includes 8 deep holes under existing workings, 10 exploration holes for north-south extension, and 7 shallow holes testing an old mine dump.
The Miller Mine, historically active between 1901-1948, has shown significant historical grades of 7.94 oz/ton Au (248 g/t Au) and 4.65 oz/ton Ag. A notable historical drill hole (#1) recorded 14.7 oz/ton Au (516 g/t) 300 feet below the lowest workings. The company is now mobilizing an underground drill rig to test the lower target area, with initial assay results expected by early September 2025.
[ "Completed 2,069 meters of drilling across 25 holes in Phase 1 campaign", "Historical high-grade results of 248 g/t Au and 145 g/t Ag", "Recent grab samples from Lower Level Winze showed 27.6 g/t Au", "Company has option to acquire 100% of the Miller Mine" ]Transatlantic Mining (TSXV: TCO) has reported promising exploration results from its Monitor Copper-Gold Project's Anvil prospect near Taft, Idaho. Underground sampling revealed high-grade copper mineralization of 3.1% Cu over 0.3 metres in the Anvil adit. The mineralization occurs within steeply dipping fissure veins along second-order structures within a prominent shear zone.
The exploration program confirmed multiple copper fissure veins within a complex system, with veins typically extending up to 1.8 metres wide. The copper-rich veins contain chalcopyrite, pyrite, calcite, siderite, and quartz, with hydrothermal alteration extending hundreds of meters into wall rocks. Samples were analyzed at Christofferson Labs and American Analytical Laboratories, following industry-standard QA/QC protocols.
Transatlantic Mining Corp. (TSXV: TCO) has reported significant exploration results from its Monitor Copper-Gold Project near Taft, Idaho. The company's surface sampling at the Big Elk prospect revealed exceptional high-grade copper mineralization, with one outcrop sample returning 36.1% Cu over 2.6 metres and another gossanous sample yielding 6.6% Cu.
The company completed 14 drill holes totaling 1,100 metres at Big Elk, with ten holes intersecting historical mining voids. While no new vein material was encountered, the drilling successfully confirmed the geometry of the mineralized structures. The mineralization occurs in steeply dipping fissure veins within a prominent shear zone, trending N40W to N70W, characteristic of the Coeur d'Alene mining district.
The company is currently integrating new magnetic survey results and Lidar data into an updated NI 43-101 report for the Monitor Project to guide future exploration efforts.