Resolution Minerals gets green light for Horse Heaven antimony-gold-tungsten drilling

• Resolution Minerals approved to drill at Horse Heaven in Idaho
• Drilling to commence in August
• The phase 1 program will include 20 holes with a focus on the Golden Gate target
• A phase 2 campaign is also planned

Special report: Drilling at Resolution Minerals’ Horse Heaven asset in Idaho’s historical Stibnite mining district is set to start in August after approval was granted by the US Forest Service.

The service approved the company’s proposed Plan of Operations, comprising 57 holes from 19 drill sites along an existing road network in Valley County.

An initial phase 1 campaign, targeting up to 20 drill holes and totalling 20,000 feet (6.096km) at the Golden Gate target area, is expected to begin next month.

The Golden Gate fault zone has a strike length of ~3.5km and hosts known disseminated gold mineralisation associated with hydrothermally altered and sheared granodiorite.

Several past drilling programs targeted shallow oxide gold, returning hits such as 36.6m at 1.51g/t gold and 71.6m at 1.37g/t but overlooked antimony and tungsten.

Resolution Minerals (ASX:RML) plans to confirm the presence of a gold resource, expand known mineralisation and potentially identify the presence of tungsten and antimony.

First drilling in over 30 years

RML CEO of US operations Craig Lindsay said receipt of this approval allowed for the first new drilling at the project in more than 30 years.

“Resolution Minerals is very excited to begin aggressively advancing Horse Heaven,” he said.

“Historically, the Golden Gate area has produced tungsten from both open pits and underground adits, and an antimony anomaly has been identified that runs parallel to the Golden Fault Zone.

“We are excited about the prospect of the Horse Heaven project and its potential to play an important role in meeting the United States’ growing demand for a domestic supply of critical metals.”

Background on Horse Heaven

The brownfields project was acquired by RML in June.

Horse Heaven shares a boundary with A$2bn market cap Perpetua Resources (PPTA.NAS) and its Stibnite gold-antimony project which hosts a 4.8Moz gold reserve and 148Mlb of antimony.

It boasts strong gold, antimony and silver mineralisation in two prospects – the Antimony Ridge Fault Zone (ARFZ) and the Golden Gate Fault Zone (GGFZ) – and includes past-producing antimony and tungsten mines.

RML’s entry into US critical minerals development comes at a terrific time, with the market attributing premiums to companies operating in the space thanks to the supportive pro-mining policies of new President Donald Trump.

The regulatory shift has seen ASX-listed US explorers race to prominence, with Dateline Resources (ASX:DTR) running from a market cap of less than $10m to more than $300m in the past two months thanks to its Colosseum gold and rare earths project in California. Other ASX listed companies with US critical minerals assets such as Trigg Minerals (ASX:TMG) and Locksley Resources (ASX:LKY) have also experienced significant re-rates on the back of the Trump Government’s ‘drill, baby, drill agenda, and China’s export bans.

What’s next?

Vendors of Horse Heaven have exercised an option and completed acquisition of 100% of the issued share capital of the company holding the Horse Heaven asset.

The acquisition remains subject to only two remaining conditions precedent – the completion of due diligence by RML on the Horse Heaven project, as well as shareholder approval which is being sought at a general meeting on July 25.

Depending on the results from the first phase, a phase 2 drilling campaign is planned for the Spring/Summer of 2026.

RML is finalising agreements with a drilling contractor and other service providers.

It is also initiating a mapping and sampling program at Golden Gate, Antimony Ridge and other emerging exploration targets to assist with planning and permitting activities for future planned drilling.

This article was developed in collaboration with Resolution Minerals, a Stockhead advertiser at the time of publishing.

This article does not constitute financial product advice. You should consider obtaining independent advice before making any financial decisions.