Resolution Minerals Ltd (OTCMKTS: RLMLF) (FRA: NC3) (ASX: RML), an Aussie critical minerals exploration company, saw its stock price surge by approximately 18 per cent following the release of exceptional assay results from surface samples at its Horse Heaven Project in Idaho last week.
The announcement, made on Jan. 14, highlighted very-high-grade antimony and silver mineralization.
This market reaction underscores growing investor enthusiasm for domestic U.S. sources of critical minerals amid geopolitical tensions and supply chain vulnerabilities. The sampling program at the property’s historical Antimony Ridge Mine yielded world-class antimony grades from surface exposures.
Five massive stibnite samples, each averaging 3.6 kilograms and collected in October of 2025, returned antimony (Sb) assays ranging from 31.7 per cent to 48.7 per cent. The overall average was 39.2 per cent Sb.
Silver (Ag) values were equally impressive, ranging from 200 grams per tonne to 890 g/t and averaging 430 g/t Ag. Standout results included a sample with 48.7 per cent Sb and 270 g/t Ag, and another yielding 37.9 per cent Sb and 890 g/t Ag. These samples also returned gold grades of up to 1.19 g/t Au.
“Antimony grades of this magnitude are rarely reported globally, particularly exposed at surface, and the consistent association with strong silver and gold values materially enhances the projects overall value proposition,” CEO of U.S. Operations, Craig Lindsay, enthusiastically stated in the ASX announcement.
These findings confirm widespread, high-grade mineralization across open pits and trenches. They have validated that Antimony Ridge could become a cornerstone asset for the junior mining company.
Read more: NevGold’s latest discovery represents near-term antimony production potential
Finds and proximity to Perpetua make project a standout
Compared to global averages, these grades are outstanding. Typical antimony ore deposits worldwide average around 1 to 5 per cent Sb, with high-grade operations like those in China rarely exceeding 10 to 20 per cent in concentrated zones.
Resolution’s surface-exposed results of nearly 50 per cent Sb are rarely documented. They position Horse Heaven among the elite tier of development-stage antimony projects globally and highlight its potential for worthwhile extraction.
The current pricing environment for antimony and silver remains robust, driven by industrial demand and supply constraints. As of early 2026, antimony prices in the U.S. hover around $40,000 per metric tonne amid export restrictions from major producers like China.
Silver, meanwhile, is trading at approximately US$90 per ounce, up over 200 per cent year-over-year. Its ascent has been fuelled by supply deficits and surging applications in clean tech.
Both metals hold national security importance in the U.S. The American government designates antimony as a critical mineral essential for defence, energy storage and semiconductors. The country imports over 90 per cent of its antimony requirements, primarily from China and Russia.
Silver’s immense rally persists
Added to the U.S. critical minerals list in 2025, silver is vital for solar panels, electric vehicles and AI infrastructure due to its valuable conductive properties.
Recent federal initiatives, including over US$2.5 billion in critical minerals funding and stockpiling proposals, emphasize securing domestic supplies to mitigate vulnerabilities.
Horse Heaven’s strategic location, just 12 kilometres east of the Perpetua Resources Corp (TSE: PPTA) (NASDAQ: PPTA) Stibnite gold-antimony project, amplifies its promising appeal. Stibnite is the number one American antimony resource under development, having received millions in federal backing.
This proximity offers shared geological insights, potential infrastructure synergies like power lines and roads and regulatory precedents from Stibnite’s recent permitting successes. For Resolution Minerals, it could mean accelerated development, reduced costs and enhanced attractiveness to investors and government partners.
The junior stands out as one of a select few making considerable discoveries in the United States. NevGold Corp (CVE: NAU) (OTCMKTS: NAUFF) (FRA: 5E50), a Nevada prospector that just discovered 2.4 to 3.0 million tonnes of previously mined material in historical leach pads with considerable antimony content, is another.
Read more: NevGold expands Limo Butte footprint by staking 90 promising antimony-gold claims
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NevGold is a sponsor of Mugglehead news coverage
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