American Tungsten & Antimony Commences Maiden Diamond Drilling at Tennessee Mountain Tungsten Project in Nevada

Shwetambri Chauhan

09 November 2026 03:33 PM AEDT

American Tungsten & Antimony Commences Maiden Diamond Drilling at Tennessee Mountain Tungsten Project in Nevada

Image Source: Krish Capital Pty Ltd

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American Tungsten & Antimony Ltd (ASX:AT4) has commenced maiden diamond drilling at its Tennessee Mountain Tungsten Project in the Alder Mining District, Elko County, Nevada, with two Energold Drilling Corp Epiroc CS14 rigs now on site operating double shifts to complete approximately 3,000 metres of HQ diamond core across 17 approved drill pads.

Key Points

Approximately 3,000m of HQ diamond drilling from 17 drill pads targeting strike and down-dip extensions at Tennessee Mountain
Historical high-grade results include 24.9m at 0.65% WO₃ from 7.68m and 18.38m at 0.72% WO₃ from surface
Historical trenching outlined a tungsten-bearing tactite zone over approximately 107m of strike, approximately 4.5m thick, grading 0.61% WO₃
Tennessee Mountain is being evaluated as a potential feedstock source for the Del Sol Refinery's proposed ammonium paratungstate circuit
The drill program is scheduled to run to December 2026, with half core samples to be submitted to American Assay Laboratories in Sparks, Nevada

Tennessee Mountain Maiden Drill Program Details

The program comprises approximately 3,000m of HQ diamond core from 17 drill pads, with holes up to approximately 250m down-hole, oriented to intersect the tactite lenses at a high angle, and twin holes on key historical holes. Drilling supervision, core logging, sampling and dispatch are being completed by the AT4 exploration team under the direction of the Company's Exploration Manager. Half core samples will be submitted to American Assay Laboratories in Sparks, Nevada, with certified reference materials, blanks and duplicates inserted. The program is scheduled to run to December 2026.

Tennessee Mountain Geology and Historical Work

Tungsten at Tennessee Mountain occurs as scheelite, with molybdenum-bearing powellite, in garnet-pyroxene tactite developed where the Late Cretaceous Coffeepot granodiorite to quartz monzonite stock intrudes limestone of the Cambrian to Ordovician Tennessee Mountain Formation. Three lenses are defined by historical drilling, each with an interpreted strike length of approximately 130m to 250m, along the approximately 1,000m of contact being drill tested. Historical drilling was largely confined to shallow levels, leaving significant portions of the prospective intrusive contact untested. No original drill core, drill logs or laboratory assay certificates have been located, and the historical results have not been verified by modern drilling.

Mineral Intelligence Engine Framework and Del Sol Refinery Feedstock Strategy

AT4's Mineral Intelligence Engine™ (MIE™) framework will assess each potential feed source, including Tennessee Mountain and third-party concentrates, against Del Sol Refinery APT circuit feed requirements to enable commercial sourcing decisions. Under this framework, each potential tungsten feedstock source is assessed for grade, scale, and potential suitability for Del Sol, subject to technical studies, testwork and commercial evaluation. For Tennessee Mountain, the immediate priority is to verify historical mineralisation and test extensions, with subsequent evaluation envisaging characterisation of representative material and beneficiation testwork to assess possible integration with the proposed APT circuit.

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