South Mountain

South Mountain (Critical and Precious Metals):
Near-Term Production, High-Value Resources

The South Mountain Project, located in Owyhee County, Idaho, is the flagship asset and cornerstone of Thunder Mountain Gold’s strategy to become a leading near-term producer of critical and precious metals in North America. This project is not a grassroots exploration endeavor but an advanced-stage development opportunity with a rich history and a clear path to production, focused on a high-grade polymetallic deposit containing zinc, silver, gold, copper, and lead.
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Why South Mountain is a Premier Development Asset

The compelling case for advancing the South Mountain mine rests on a rare combination of factors. The deposit hosts high-grade mineralization of metals essential for modern industry and the green energy transition. Significant existing underground infrastructure, including over 8,000 feet of accessible workings, dramatically reduces initial capital requirements and shortens the development timeline.

Furthermore, the project is situated on private land in a historically mining-friendly jurisdiction, which streamlines permitting processes and provides a stable operating environment. Robust project economics, supported by extensive historical data and modern NI 43-101 compliant resource estimates, underscore the project's viability and potential for generating substantial returns while contributing to a secure domestic supply of vital metals.

Unique Advantages of the South Mountain Deposit

Several unique advantages distinguish the South Mountain deposit and position it for success:

High-Grade Polymetallic Mineralization

The deposit is rich in zinc, silver, and gold, with significant copper and lead credits. This diversity offers resilience against commodity price fluctuations and enhances overall project value. The grades are confirmed by historical production records from Anaconda and over 60,000 feet of modern drilling.

Advanced Existing Infrastructure

The presence of extensive underground development significantly de-risks the project, offering a fast-tracked route to production with lower upfront capital costs compared to building a new underground mine from scratch.

Strategic Land Position & Permitting

Being located on private land in Owyhee County, Idaho, simplifies the permitting pathway and reduces regulatory hurdles often associated with projects on federal lands. Strong local and state support further enhances this advantage.

Compelling Projected Economics

Based on a 750 tons per day operation with an initial 10-year mine life, the project has an estimated low Capital Expenditure (CapEx) of approximately $70 million and a low Operating Cost (OpEx) of around $140 per ton. This supports a projected after-tax Internal Rate of Return (IRR) of 25% and a Net Present Value (NPV) of $50 million (at a 5% discount rate).
These factors collectively highlight South Mountain's potential to quickly become a significant and profitable contributor to North America’s supply of critical and precious metals.

South Mountain Project: Quick Facts

Location

Location

Owyhee County, Idaho, USA (Mining-friendly jurisdiction)

Location

Location
Owyhee County, Idaho, USA (Mining-friendly jurisdiction)
Location

Location

Owyhee County, Idaho, USA (Mining-friendly jurisdiction)
Location

Location

Owyhee County, Idaho, USA (Mining-friendly jurisdiction)
Ownership

Ownership

Primarily on private land, minimizing permitting complexities

Ownership

Ownership
Primarily on private land, minimizing permitting complexities
Ownership

Ownership

Primarily on private land, minimizing permitting complexities
Ownership

Ownership

Primarily on private land, minimizing permitting complexities
Metals

Metals

High-grade polymetallic deposit rich in Zinc (Zn), Silver (Ag), and Gold (Au), with significant Copper (Cu) and Lead (Pb) credits

Metals

Metals

High-grade polymetallic deposit rich in Zinc (Zn), Silver (Ag), and Gold (Au), with significant Copper (Cu) and Lead (Pb) credits

Metals

Metals

High-grade polymetallic deposit rich in Zinc (Zn), Silver (Ag), and Gold (Au), with significant Copper (Cu) and Lead (Pb) credits

Metals

Metals

High-grade polymetallic deposit rich in Zinc (Zn), Silver (Ag), and Gold (Au), with significant Copper (Cu) and Lead (Pb) credits

Resource

Resource

NI 43-101 compliant resource estimate, supported by extensive historical data (Anaconda Mining) and over 60,000 feet of modern drilling

Resource

Resource
NI 43-101 compliant resource estimate, supported by extensive historical data (Anaconda Mining) and over 60,000 feet of modern drilling
Resource

Resource

NI 43-101 compliant resource estimate, supported by extensive historical data (Anaconda Mining) and over 60,000 feet of modern drilling
Resource

Resource

NI 43-101 compliant resource estimate, supported by extensive historical data (Anaconda Mining) and over 60,000 feet of modern drilling
Infrastructure

Infrastructure

Advanced existing underground infrastructure with over 8,000 feet of developed workings, providing a fast track to production

Infrastructure

Infrastructure

Advanced existing underground infrastructure with over 8,000 feet of developed workings, providing a fast track to production

Infrastructure

Infrastructure

Advanced existing underground infrastructure with over 8,000 feet of developed workings, providing a fast track to production

Infrastructure

Infrastructure

Advanced existing underground infrastructure with over 8,000 feet of developed workings, providing a fast track to production

Exploration Upside (within South Mountain Complex):

Exploration Upside (within South Mountain Complex):

Significant potential for resource expansion through identified targets like Carbonate Replacement Deposits (CRD), Cu-Mo Porphyry style mineralization, and the Gold Breccia Zone

Exploration Upside (within South Mountain Complex):

Exploration Upside (within South Mountain Complex):

Significant potential for resource expansion through identified targets like Carbonate Replacement Deposits (CRD), Cu-Mo Porphyry style mineralization, and the Gold Breccia Zone

Exploration Upside (within South Mountain Complex):

Exploration Upside (within South Mountain Complex):

Significant potential for resource expansion through identified targets like Carbonate Replacement Deposits (CRD), Cu-Mo Porphyry style mineralization, and the Gold Breccia Zone

Exploration Upside (within South Mountain Complex):

Exploration Upside (within South Mountain Complex):

Significant potential for resource expansion through identified targets like Carbonate Replacement Deposits (CRD), Cu-Mo Porphyry style mineralization, and the Gold Breccia Zone

Company Focus

Company Focus

Near-term production, contributing to North America’s critical and precious metals supply chain

Company Focus

Company Focus

Near-term production, contributing to North America’s critical and precious metals supply chain

Company Focus

Company Focus

Near-term production, contributing to North America’s critical and precious metals supply chain

Company Focus

Company Focus

Near-term production, contributing to North America’s critical and precious metals supply chain

CONTACT US

We welcome inquiries from investors, analysts, and others interested in learning more about our company. Please fill in the contact form with your details and how we can help you, and we'll respond promptly.

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Thunder Mountain Gold is a precious metals explorer, both actively focusing on developing high-quality precious and base metal projects in North America.

Our Location

11770 W President Dr. Ste. F
Boise, ID 83713
(208) 658-1037

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