Resolution Minerals Ltd (ASX:RML, OTCQB:RLMLF, FRA:NC3) is preparing to launch a major follow-up drilling campaign at its Horse Heaven gold-antimony-tungsten-silver project in Idaho, with the new program designed to build on the success of its 2025 work at Golden Gate and move the target closer to a maiden resource.
The company plans to begin a fully permitted Phase 2 diamond drilling program in early May 2026, comprising up to 45 holes for 13,700 metres at the Golden Gate fault zone. The campaign is a substantial step-up from the Phase 1 program completed in 2025, which totalled 3,780 metres across 14 holes.
Horse Heaven Project location map, highlighting the location of the two current major antimony-gold-silver- tungsten targets, the Golden Gate Target (where the Phase 1 Core Drilling Program was conducted) and the Antimony Ridge Target. Also highlighted is the fully-permitted Stibnite Gold Project, which is only 12km due east of Horse Heaven. Note: Coordinates are UTM metres north and east metric system, not latitude/longitude.
“Following our impressive 2025 drill campaign, it is clear that Golden Gate hosts a large continuous gold mineralised system, with all holes intersecting mineralisation and remaining open at depth," RML’s CEO of US Operations, Craig Lindsay, said.
“The upcoming drill program is designed to define the size and shape of this system, and to advance Golden Gate toward a maiden JORC-compliant Mineral Resource Estimate.
“Importantly, mineralisation remains open in multiple directions, and we are only beginning to understand the full scale for the Golden Gate system.”
New program builds on 2025 campaign
Importantly for Resolution, the new drill program follows a first-pass campaign in which every hole intersected gold mineralisation from surface and remained open at depth, giving the company confidence that Golden Gate may host a much larger mineralised system than initially outlined.
Phase 1 returned a series of broad gold intercepts that now form the basis for the expanded 2026 campaign, including 253 metres at 1.5 grams per tonne (g/t) gold in hole HH-GG25-003C, 197.5 metres at 1.26 g/t gold in HH-GG25-001C, 265.2 metres at 0.6 g/t gold in HH-GG25-002C and 240.8 metres at 0.64 g/t gold in HH-GG25-004C.
At Golden Gate North, drilling also highlighted tungsten mineralisation, including 21 metres at 0.06% tungsten in hole HH-GG25-012R, pointing to the project’s broader multi-commodity potential.
North and south targets in focus
The upcoming Phase 2 campaign will target both Golden Gate North and Golden Gate South, with about 60% of drilling currently planned for the southern area and 40% for the north. Two MP1500 core diamond rigs are set to be used, with no reverse circulation drilling planned.
At Golden Gate North, Resolution will use a mix of infill and step-out drilling to test strike and depth extensions around earlier results, while also following up tungsten intersections and anomalous tungsten zones near the historic Golden Gate Tungsten Mine workings.
Map showing combined Golden Gate North and South Phase 2 drill targets.
At Golden Gate South, the company will focus on expanding what it describes as an emerging discovery after hole HH-GG25-013R returned 99.1 metres at 0.38 g/t gold from surface to end of hole, finishing in mineralisation. That result also confirmed near-surface oxidised gold mineralisation extending east of the 2025 drilling area.
Next steps point to maiden resource pathway
Resolution said the broader aim of the new program is to define the scale and geometry of mineralisation between Golden Gate North and South, test whether the two zones are connected or offset, and support progress toward a maiden Mineral Resource Estimate targeted for Q1 2027, subject to successful outcomes.
Assays and geological interpretation from the 2026 field season are expected to guide ongoing step-out and follow-up drilling through mid-August. In parallel, the company is advancing a new plan of operations to expand the drilling footprint along the Golden Gate fault zone, a separate plan for Antimony Ridge, and metallurgical work aligned with project milestones.
Activities will include:
- Diamond drilling program across Golden Gate North and South
- Step-out drilling to expand mineralisation along strike
- Deeper drilling to test extensions at depth
- Ongoing geological logging, sampling and assay results.
In parallel, RML is progressing
- A new Plan of Operations to expanded drilling footprint the Golden Gate Fault Zone.
- A separate Plan of Operations for Antimony Ridge, including drilling and bulk sampling of near-surface high-grade antimony mineralisation
- Ongoing metallurgical test work which will be scaled in line with drilling progress and key project milestones.