Why American Tungsten & Antimony (ASX:AT4) Reported High-Grade Antimony Drilling and Silver Rock Chip Results in the United States

Sonal Goyal

15 October 2026 10:45 PM AEDT

Why American Tungsten & Antimony (ASX:AT4) Reported High-Grade Antimony Drilling and Silver Rock Chip Results in the United States

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Hole ACP26DD023 at Little Emma intersected 1.49 metres at 18.23 per cent antimony, including a 0.36 metre interval at 68.1 per cent.
Rock chip samples at White Spar returned silver of 665, 432 and 394 grams per tonne, although selective chips are not representative of average grades.
The White Spar Acquisition remains subject to completion and conditions precedent, including Shareholder approval.

American Tungsten & Antimony Ltd (ASX:AT4) has reported two sets of exploration results: the final six diamond holes from its Little Emma prospect at Antimony Canyon in Utah, and rock chip samples from the White Spar prospect in Arizona. The company links them to its United States mine-to-metal strategy, which centres on its Del Sol processing facility. The results are exploration-stage only, and no Mineral Resource, Ore Reserve or production target is reported.

Little Emma drilling in Utah

The company's 30-hole diamond programme totalled 1,970 metres, and all holes have now been assayed. The best of the final six holes was ACP26DD023, which intersected 1.49 metres at 18.23 per cent antimony from 28.35 metres. That includes 0.79 metres at 33.95 per cent from 29.05 metres, and a 0.36 metre interval at 68.1 per cent antimony. The 68.1 per cent figure is the highest single sample in the programme, compared with a previous peak of 42.1 per cent in hole ACP26DD026.

Other holes returned lower grades, including 7.32 metres at 0.63 per cent antimony from 3.96 metres in ACP26DD027 and 7.19 metres at 0.28 per cent from 7.62 metres in ACP26DD029. Mineralisation is hosted in a calcareous unit of the Paleocene Flagstaff Formation whose upper contact has been traced over more than 300 metres of strike. Intervals are down-hole lengths, reported above a 0.1 per cent antimony cut-off, and true widths have not been confirmed. The company also cites two earlier intersections: 10.37 metres at 3.98 per cent antimony and 11.03 metres at 3.1 per cent.

White Spar silver results in Arizona

Eleven selective rock chip samples were collected on 22 June 2026. Three returned notable silver: 665 grams per tonne (WS008), 432 grams per tonne (WS009, from an eastern lode about 280 metres from the main workings) and 394 grams per tonne (WS007). The main corridor is about 600 metres long. The company states that selective rock chips are not representative of average grades, and that no company standards, blanks or duplicates were included in the White Spar batch, with umpire checks planned. It also lists historical information about past silver production at White Spar, which it has not verified and says should not be relied upon.

Processing and acquisition context

The company says its Del Sol Facility recently produced 99.8 per cent purity antimony ingot from White Spar material, exceeding a Regulus II specification, as previously announced on 21 September and 13 October 2026. Del Sol is intended to process feed from existing workings, third-party offtake, direct ore and concentrate purchases, and future production from exploration prospects. The company is assessing silver recovery from the Del Sol hydrometallurgical circuit and studies into expanded antimony capacity.

The acquisition of White Spar through Del Sol and Nexus Metals, announced on 28 July 2026, remains subject to completion and conditions precedent, including shareholder approval. The announcement states that completion is not certain.

Next steps and risks

At White Spar, the company plans to trench historic pits, sample historic veins and portals, take channel samples, carry out structural mapping and collect a bulk metallurgical sample for antimony and silver recovery, with drilling to be planned once orientations are measured. At Little Emma and Antimony Canyon, it intends to assess induced polarisation and electromagnetic data, continue soil sampling and compile multi-element core data.

Permitting is a stated constraint. Drilling at Blackjack has an approved Notice of Intent from Utah's Division of Oil, Gas and Mining, but a Forest Service access permit is pending. Drill designs for the Mammoth, Stella and Stebinite prospects have been submitted to the state regulator. The company also cautions that forward-looking statements are subject to metallurgical, permitting and funding risks.

No timetable or cost for these programmes is given in the announcement.

FAQs

Q: What did the final Little Emma holes show?

A: The best of the final six holes, ACP26DD023, intersected 1.49 metres at 18.23 per cent antimony from 28.35 metres. The 30-hole, 1,970 metre programme has now been fully assayed, and other holes returned lower grades.

Q: What were the White Spar silver results?

A: Eleven selective rock chip samples were collected on 22 June 2026, and three returned notable silver of 665, 432 and 394 grams per tonne. The company states that selective rock chips are not representative of average grades.

Q: Is there a Mineral Resource for these prospects?

A: No. The results are exploration-stage only, and no Mineral Resource, Ore Reserve or production target is reported. True widths of the drill intervals have not been confirmed.

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