Outer Rim Exploration Launches Maiden Muon Imaging Survey for Copper Mineralisation with Transatlantic Mining

On December 15, 2025, Transatlantic Mining Corp. (TCO) announced it has engaged Outer Rim Exploration (ORE) to conduct a maiden technical trial using a portable muon hodoscope at its Monitor Copper Gold project in Idaho, USA. This survey aims to generate subsurface images of mineralized zones and historical mine voids. The stated purpose is to inform future drill planning and exploration activities, with CEO Bernie Sostak emphasizing replacing "guesswork with captured data" and using particle physics for practical exploration.

This news release details the commencement of a technical trial utilizing an advanced geophysical exploration technique. While muon tomography is a sophisticated tool that could potentially improve understanding of subsurface geology and optimize drill targeting, this is an early-stage application. The survey's immediate objective is to inform drill planning, not to announce discovery, resource definition, or even drill results.

Comparing this to previous news: * November 28, 2025 Financials: The most recent financial statements (Sept 30, 2025) revealed a significant working capital deficit of -$2.2 million and total current liabilities of $5.27 million, largely comprised of accounts payable and accrued liabilities (>$4.3 million), including $3.58 million owed to related parties. The company's total shareholders' deficiency was -$67,798. This indicates a precarious financial position and an urgent need for capital, which is the overriding concern for investors. * December 1, 2025 NI 43-101 Report: The maiden NI 43-101 technical report for Monitor established conceptual exploration targets, which was a more significant milestone, providing a framework for future work. * July 14, 2025 Monitor Drilling: Prior drilling at the Big Elk prospect within Monitor (1,100 meters across 14 holes) mostly intersected voids from historical mining, with no new vein material for positive analytical results in initial drilling. Four exploration holes yielded no visible mineralization and were not sampled. This was a notable disappointment, overshadowing a high-grade surface sample (36.1% Cu over 2.6m). * Ongoing Miller & Golden Jubilee Exploration: The company has ongoing exploration and drilling at its Miller and Golden Jubilee projects, with assays pending for Miller from a program that started in late May.

In this context, the muon imaging survey is a routine exploration activity. It's a positive step in gathering data but does not alleviate the significant financial risks or the recent exploration disappointments at Monitor. It's merely a precursor to potentially more effective drilling, which is still some time away. Given the company's financial state, any news that does not directly address capital needs or provide clear, actionable, positive economic results from drilling is unlikely to have a material positive impact on the stock. Conversely, it is not negative news, as it represents ongoing efforts. Therefore, the impact is neutral.

Transatlantic Mining Corp. (TCO) is a Canadian mineral exploration company focused on copper and gold projects in the United States. Its primary projects include:

• Monitor Copper-Gold Project (Idaho, USA): This is presented as the flagship project, with an 80% ownership stake. It is in the exploration stage, located in the Coeur d'Alene Mining District. Initial exploration has focused on three copper-siderite vein systems: Monitor, Richmond, and Big Elk. A maiden NI 43-101 technical report (Dec 1, 2025) established conceptual exploration targets for a combined 1.2M-2.9M tonnes at 1.2-3.5% Cu (with precious metal credits). Historical drilling and sampling have confirmed mineralization, including high-grade surface samples (e.g., 36.1% Cu over 2.6m at Big Elk). However, recent drilling at Big Elk (July 14, 2025) primarily intersected historical mine voids rather than new mineralization. The latest news (Dec 15, 2025) involves a muon imaging survey to aid future drill targeting.
• Miller Gold Mine (Montana, USA): TCO holds an option to acquire 100% of this historic gold mine. Historical production (1901-1948) averaged high grades (7.94 oz/t Au, 4.65 oz/t Ag). The company recently entered its second lease renewal term (May 28, 2025) and has undertaken a Phase 1 drill program of up to 3,000 meters to target downdip extensions of known mineralization. Assays from this program are pending.
• Golden Jubilee Project (Montana, USA): TCO recently received a permit (Sept 8, 2025) for new drilling and dewatering, planning 1,000 meters of drilling to test downdip extensions and geophysical targets. Historical drilling has shown high-grade gold intercepts (e.g., 9.1m of 7.8 g/t Au).

The company is in the early-to-mid exploration phase across its portfolio, with no declared mineral resources or reserves under NI 43-101 standards, only conceptual exploration targets.