- 01AT4’s latest 17-hole assay tranche was led by 10.37m at 3.98% Sb, including 4.57m at 8.56% Sb, from Little Emma in Utah.
- 02Phase 1 drilling has reached 30 holes for 1,970m, supporting AT4’s model of high-grade stibnite pods inside a broader stratabound antimony system.
- 03Near-term watchpoints are soil results, planned Blackjack drilling and USFS approvals, alongside the bigger question of whether drilling can support a future Mineral Resource.
American Tungsten & Antimony (ASX: AT4) says new assay results from 17 more Phase 1 diamond holes at the Little Emma Prospect have extended the antimony system at its Antimony Canyon Project in Utah, USA.
The main result came from hole ACP26DD026, which returned 10.37 metres at 3.98% antimony from surface, including 4.57 metres at 8.56% Sb from 6.71m to 11.28m.
Within that interval, the company reported 0.3m at 42.1% Sb, described in the release as near-pure massive stibnite.
Another notable hole, ACP26DD014, delivered 5.7m at 2.80% Sb, including 1.95m at 8.09% Sb from 51.21m to 53.16m.
According to the company, the new assays reinforce its interpretation that Little Emma hosts a stratabound antimony system made up of discrete high-grade stibnite pods within broader lower-grade mineralised envelopes.
Mineralisation has continued along strike and remains open in multiple directions, supporting further step-out work.
Antimony Canyon the Flagship
Before the latest drill results, Antimony Canyon was already the company’s flagship US antimony asset.
The project sits in Garfield County, Utah, and the current drilling is focused on the patented part of the tenure, where the company said it holds 100% ownership.
The latest release states the patented ground comprises 20 patented claims.
Earlier company materials have framed that patented core as important because it offers a different permitting pathway from the broader district-scale unpatented ground.
The latest results broaden the project picture beyond Little Emma by naming additional prospects and target areas including Blackjack, Mammoth, Stella and Stebenite, along with USFS-adjacent targets.
That suggests the company is trying to use the Little Emma drill program not just to define one prospect, but to test whether the same geological model can be applied across the wider Antimony Canyon Project.
Assays, Metres, and Study Clues
Phase 1 drilling at Little Emma has now reached 30 holes for 1,970 metres, assays for 24 of which have now been received.
One of the more technically useful holes in the new batch was ACP26DD025, which returned 12.1m at 0.26% Sb.
While that interval did not contain a discrete high-grade pod, AT4 said it confirmed lateral persistence of the Salt and Pepper host horizon, meaning that the company is seeing evidence that the mineralised package continues, even where the richer pod-style zones are absent.
There was a more cautious point in hole ACP26DD002, where assay results came back significantly lower than earlier visual expectations.
The company said that outcome showed visible stibnite abundance does not reliably predict bulk assay grade, particularly in inter-pod matrix material.
Lab Results the True Test
That is an important detail for a pre-resource exploration story.
Early visual logging can point to the presence of sulphides, but laboratory assays are what determine whether those sulphides translate into grades and widths that remain consistent enough for resource work later on.
The company also outlined a geochemical pathfinder suite of Sb-As-Hg-Tl, with molybdenum also elevated, while gold remained low.
AT4 said that pattern supports the interpretation of a primarily antimony-dominant hydrothermal system and could help refine future targeting.
Next Catalysts and Key Risks
AT4's next step is soil sampling across the patented claims, with assay results expected within six weeks.
Those results are planned to help refine targeting outside the currently drilled Little Emma footprint, which the company said represents only about 1% of the total project footprint.
The company also said a drilling program at Blackjack is anticipated to start in about two months, subject to US Forest Service permit approval.
The announcement stated DOGM approval of the Notice of Intent for Blackjack has been reported, while the federal permitting process is still in preparation.
Elsewhere in the district, programme designs for Mammoth, Stella and Stebenite are advancing, with Notices of Intent targeted for June 2026, according to the filing.
Project Focus Broadening
The broader read-through is that AT4 is shifting from a single-prospect test toward a canyon-wide exploration campaign, but several of the next steps remain dependent on approvals and execution timing, particularly where work moves beyond the patented core and into areas with a different regulatory pathway.
There are also geological risks still in view.
The company has not yet defined a Mineral Resource, and the new results themselves show why more drilling is needed.
Strong high-grade pods have been intersected, but some holes are carrying broader lower-grade envelopes and at least one visually encouraging hole underperformed on assay.
For readers watching the story from here, the near-term milestones are clear: soil assay results from the patented claims, the timing of any USFS approvals for Blackjack, and whether follow-up drilling continues to show repeatable high-grade pods with enough continuity to support a future resource pathway.
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