American Tungsten & Antimony Begins Wet Table Trials on Scheelite

American Tungsten & Antimony has begun wet table trials at its refinery on tungsten-bearing scheelite mineralisation sourced from its Dutch Mountain project and other nearby material, a gravity-separation test step ahead of any move toward tungsten production.

American Tungsten & Antimony has started wet table trials at its refinery, running tungsten-bearing scheelite mineralisation across shaking tables to see how cleanly the heavy tungsten mineral separates from the rest of the rock. The material comes from the company's Dutch Mountain project and from other nearby sources, according to Stockhead Resources.

It is a small step in engineering terms and a meaningful one in commercial terms. Wet tabling is the oldest trick in the tungsten book, and for most scheelite deposits it is still the gatekeeper: if the mineral does not respond to gravity, everything downstream gets more expensive.

What a wet table actually does

A wet shaking table is a sloped, riffled deck that vibrates while a thin film of water washes ore pulp across it. Dense particles hug the deck and travel along the riffles; lighter gangue floats off the side. Because scheelite — calcium tungstate, the main commercial tungsten mineral alongside wolframite — is markedly denser than the quartz, calcite and silicates it typically sits in, gravity separation does a lot of the work before any chemistry is involved.

That matters for a developer's cost structure. Every tonne of waste removed by water and vibration is a tonne that never has to be crushed finer, floated with reagents, or fed into a chemical circuit. Trials of this kind are designed to answer a short list of practical questions: at what grind size does the scheelite liberate from its host rock, what percentage of contained tungsten reports to the concentrate, and how much of the deck's product is actually saleable rather than middlings that need to be recirculated.

The answers set the shape of a flowsheet. A strong gravity response points toward a simpler, cheaper plant. A weak one pushes the design toward flotation and finer grinding, which raises both capital cost and operating cost per tonne.

Why the refinery detail is the interesting part

The trials are being run at the company's refinery rather than solely at a third-party laboratory, and material from beyond Dutch Mountain is going through the same equipment. Both details point at an ambition wider than a single deposit.

Tungsten is a hub-and-spoke business. Individual deposits are often small, high-grade and awkwardly located; processing capacity is scarce and expensive. A developer that controls a refining facility can, in principle, treat its own ore and third-party feed through the same circuit, spreading fixed costs over more tonnes. Testing several sources on the same tables is the first practical check on whether that model works — different ores behave differently, and a plant built around one feedstock can choke on another.

For investors, the question the trials begin to answer is not "is there tungsten in the ground" but "can this company turn rock into a concentrate someone will buy, at a cost that leaves something over." That is the step where a great many junior mineral projects stall.

The critical-minerals backdrop

Tungsten sits on the critical-minerals lists of the United States, the European Union and other industrial economies for reasons that have little to do with speculation. It is the hardest and highest-melting-point metal in wide industrial use, and tungsten carbide underpins cutting tools, mining bits, and armour and munitions manufacture. Substitutes exist in some applications; in most of the demanding ones, they are worse.

The supply side is where the anxiety comes from. Mine output and, more importantly, downstream refining into ammonium paratungstate and tungsten powders are heavily concentrated in a small number of jurisdictions, with China dominant. Western buyers have spent the past several years discovering that a mine outside China does not solve the problem if the concentrate still has to be shipped to China for conversion. Refining capacity in North America is therefore worth more, strategically, than another undeveloped orebody.

That is the context in which a wet table trial deserves more attention than its technical modesty suggests. A domestic route from scheelite ore to a marketable tungsten product is precisely the gap that industrial buyers and defence procurement offices say they want filled.

What the trials can and cannot prove

Metallurgical testwork moves in stages, and it is worth being clear about what this one covers. Bench and pilot-scale gravity trials establish recovery and concentrate grade on the samples fed into them. They do not establish that the deposit is uniform, that the results scale, or that a full plant will hit the same numbers on continuous operation. Nor do they say anything about mine economics — strip ratios, grade continuity, permitting and capital cost all sit outside the scope.

What they do provide is the first hard evidence for or against the flowsheet assumption underneath everything else. A poor gravity response is discoverable early and cheaply on a shaking table; discovering it after a plant is built is ruinous.

What to watch next

Several things follow logically from a trial like this, and their sequence tells you how the project is progressing:

• Reported recovery and concentrate grade. Tungsten concentrate is conventionally traded on contained WO₃ content, and buyers care about penalty elements as much as headline grade.
• Whether third-party feed performs like Dutch Mountain material. Consistency across sources is what would validate a toll-treatment or hub strategy.
• The move from tables to a full flowsheet. Whether flotation, magnetic separation or chemical upgrading gets added tells you how simple — and how cheap — the plant can be.
• Any offtake or supply discussion. Tungsten buyers, particularly those with defence exposure, tend to engage once a producer can show a specification, not before.
• Funding. Metallurgy is inexpensive relative to a processing plant. The financing route the company chooses will say a great deal about how confident it is in these results.

The wider market frame

Critical-minerals developers are being read against a benign broad-market tape. On the most recent close, Friday 21 August 2026, the S&P 500 tracker (NYSEARCA: SPY) finished at $765.72, up 0.41% on the day from a prior close of $762.60. The Nasdaq 100 fund (NASDAQ: QQQ) closed at $713.44, up 0.35%, and the Dow 30 tracker (NYSEARCA: DIA) at $532.22, up 0.89%.

Risk appetite of that kind generally helps small resource developers raise money, but it is not what determines the outcome here. Tungsten projects live or die on metallurgy, refining access and offtake. A shaking table in a refinery is where all three start to intersect.

Key facts

• Trial stage: Refinery wet table (gravity separation) trials underway
• Feed material: Tungsten-bearing scheelite from Dutch Mountain and other nearby sources
• Benchmark close: S&P 500 tracker SPY $765.72, +0.41%, as of 21 Aug 2026 20:00 GMT
• Why tungsten matters: Critical mineral for carbide tooling, mining bits and munitions; refining heavily concentrated outside North America

Frequently asked questions

What is a wet table trial?

A wet shaking table is a sloped, vibrating deck washed with a thin film of water. Ore pulp is fed across it and dense minerals travel along riffles while lighter waste rock washes away. Trials measure how much of the target mineral is captured and at what concentrate grade, establishing whether gravity separation alone can do useful work.

What is scheelite?

Scheelite is calcium tungstate, one of the two main commercial tungsten minerals along with wolframite. It is considerably denser than the quartz, calcite and silicate minerals it usually occurs with, which is why gravity methods such as shaking tables are the conventional first step in processing scheelite ore into a saleable concentrate.

Where is the material for these trials coming from?

American Tungsten & Antimony is running the trials on tungsten-bearing scheelite mineralisation sourced from its Dutch Mountain project along with other nearby sources. Testing multiple feed sources through the same refinery equipment is a first check on whether one processing circuit can handle ore of varying character.

Why is tungsten considered a critical mineral?

Tungsten has the highest melting point of any metal in common industrial use, and tungsten carbide is essential to cutting tools, drill bits and armour and munitions manufacture. Substitutes perform poorly in demanding applications, and both mining and downstream refining capacity are concentrated in a small number of jurisdictions, with China dominant.

What do these trials not prove?

Gravity testwork establishes recovery and concentrate grade on the specific samples fed to the equipment. It does not demonstrate that a deposit is uniform, that results scale to continuous full-plant operation, or that the project is economic. Strip ratio, grade continuity, permitting and capital cost all sit outside the scope of metallurgical trials.

What should investors watch after the trials?

The key items are reported recovery and concentrate grade on a contained WO₃ basis, whether third-party feed behaves like Dutch Mountain material, whether the flowsheet needs flotation or chemical upgrading added, any offtake discussions with industrial or defence buyers, and how the company chooses to fund the step from testwork to a processing plant.

Sources

• American Tungsten & Antimony starts refinery wet table trials — Stockhead Resources

Photo: Castorly Stock · Pexels Licence — source