Northwire Canada EditionThursday, September 17, 2026
Northwire
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M&A / Property Routine +

Thunder Mountain Gold Significantly Increases Land Position at The South Mountain Property

Thunder Mountain Gold Expands Idaho Footprint, But Cash Burn and MFD Revenue Splits Keep Near-Term Upside Capped

Executive Summary
  • Thunder Mountain Gold secured a 20-year state mineral lease covering approximately 3,675 acres adjacent to its South Mountain Mines Property, approved by the Idaho State Land Board and Governor Brad Little.
  • The company's total consolidated land position has expanded to 13,061 acres (~20 square miles) through the state lease, 113 acres of contiguous private land, 423 new BLM lode claims (~8,200 acres), and a 1,073-acre private lease.
  • 2025 exploration programs, including geophysical surveys and field mapping, identified encouraging porphyry potential across the newly consolidated package.
  • Follow-up geophysical work is scheduled to further delineate high-priority trends.
  • CEO Eric T. Jones stated the lease strengthens the land position and advances the district-wide exploration strategy, highlighting constructive state support.
Material Impact
  • The land expansion is a standard, incremental step for an exploration-stage company aiming to secure a larger district footprint.
  • It does not immediately de-risk the project, convert to resources, or generate revenue.
  • The announcement aligns with the previously announced Phase II exploration program and the ongoing MFD partnership for small-scale production pathways.
  • No new financial terms, production timelines, or strategic partnerships were disclosed alongside the land acquisition.
  • The market likely anticipated continued land consolidation given the company's stated exploration strategy and prior financing.
THM · Price
Company Overview
  • South Mountain Mine is a polymetallic project located ~70 miles SW of Boise, Idaho, focusing on Zinc, Silver, Gold, Copper, and Lead.
  • The project features over 4,000 feet of rehabilitated, MSHA-compliant underground development.
  • Over $25 million has been invested since 2007.
  • Historic smelter records indicate average grades of 14.5% Zn, 10.6 oz/t Ag (363 g/t), 0.058 oz/t Au (1.98 g/t), 1.4% Cu, and 2.4% Pb.
  • The company is currently in the exploration and pre-production phase, targeting resource expansion and small-scale production pathways.
Read the original news release →

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