Tellurium's expanding role in solar power and data-center waste-heat recovery is spotlighted in a new report, even though more than 90% of global supply still comes from copper refining's leftover anode slime.
At a glance
- A report published August 25, 2026, "Tellurium in Copper Slime: The Critical Mineral Powering Clean Energy," spotlights First Tellurium Corp.'s subsidiary PyroDelta Energy Corp.
- More than 90% of global tellurium supply comes as a byproduct of copper anode slime, the residue left over after copper is electrorefined, rather than from dedicated tellurium mines.
- Cadmium telluride (CdTe) solar photovoltaics are identified as the primary current driver of tellurium demand.
- PyroDelta is developing tellurium-based thermoelectric materials, using a proprietary Capillary Casting manufacturing process, aimed at capturing waste heat from AI data centers — relevant given that an estimated 20% to 50% of global energy consumption is lost as waste heat.
What happened
A new industry report published August 25, 2026, examines tellurium's expanding role in clean energy and puts a spotlight on First Tellurium Corp.'s majority-owned subsidiary, PyroDelta Energy Corp. The report, titled "Tellurium in Copper Slime: The Critical Mineral Powering Clean Energy," lays out a structural supply problem behind the metal's growing demand: more than 90% of the world's tellurium comes not from dedicated tellurium mines, but as a byproduct recovered from anode slime, the sludge left over when copper is electrolytically refined. Economically viable primary tellurium deposits are exceptionally rare, which is why First Tellurium's Deer Horn gold-silver-tellurium property in west-central British Columbia — one of the few high-grade primary tellurium prospects found anywhere outside China, and a site First Solar has taken note of — stands out. PyroDelta, First Tellurium's technology arm, is separately developing tellurium-based thermoelectric materials aimed at capturing waste heat from AI data centers and converting it back into usable electricity, using a proprietary manufacturing process the company calls Capillary Casting.
The details
Tellurium's supply problem is baked into how the metal is produced. Unlike copper, gold or even most minor metals, tellurium has essentially no dedicated mines of its own — global output rides almost entirely on copper refiners choosing to recover it from anode slime, the metal-rich sludge that settles out during electrorefining, rather than treating that slime purely as a source of gold and silver. That makes tellurium supply a function of copper refining capacity and refiners' own recovery decisions, not a standalone tellurium market that responds to price the way most metals do. CEO Tyrone Docherty's point — that a producer can't simply open a conventional tellurium mine when demand rises — is the practical consequence of that structure: with only a handful of economically viable primary deposits known anywhere, including First Tellurium's Deer Horn property in British Columbia, new dedicated supply would take years to bring online even if the will and the capital existed.
Demand, meanwhile, is broadening beyond tellurium's traditional base. Cadmium telluride thin-film solar panels remain the metal's largest current market, but PyroDelta's thermoelectric work points to a second, structurally different source of pull: waste heat. Somewhere between a fifth and half of all global energy consumption is ultimately lost as heat rather than converted into useful work, and PyroDelta's tellurium-based thermoelectric materials are engineered specifically to recover a slice of that loss, with early commercial focus on the waste heat thrown off by AI data centers. Its Capillary Casting process, which custom-casts thermoelectric material into application-specific shapes, is a manufacturing bet on making thermoelectric recovery viable outside the handful of niche, high-cost applications where it has traditionally been confined.
Put those two threads together and the read for tellurium is straightforward: demand keeps finding new applications faster than the metal's supply base can widen, because that supply base is structurally tied to copper refining rather than tellurium's own economics. For a market this small and this concentrated, even a modest new source of demand — data-center waste-heat recovery alongside an already-growing solar sector — is a meaningful call on a metal where new dedicated mine supply essentially isn't an option on any near-term timeline.
Why it matters
Tellurium rarely gets standalone coverage because its market is tiny relative to base and precious metals, but its byproduct-only supply structure makes it a useful bellwether for how thin the buffer is behind several clean-energy-critical minor metals. As solar manufacturing and now thermoelectric waste-heat recovery both compete for the same limited byproduct stream, the copper-refining decisions that determine tellurium supply become relevant well beyond copper's own market.
Our read
Outlook: bullish. Tellurium demand is broadening beyond solar into thermoelectric waste-heat recovery, while more than 90% of supply remains tied to copper refiners' byproduct recovery decisions rather than dedicated mining — a structural setup that points toward tighter availability and upward price pressure over time, even without a single dated price-moving trigger.
What to watch
- Progress on PyroDelta's thermoelectric technology toward commercial deployment in AI data centers
- Any drilling or development updates at First Tellurium's Deer Horn primary tellurium property in British Columbia
- Whether more copper refiners announce new anode-slime tellurium recovery circuits as demand from solar and thermoelectric applications grows
For information only, not investment advice.
Tellurium price in India
metalscost.com India reference price as of 2026-11-05.
Detailed analysis
Timeline
- 2026-08-25: Discovery Alert publishes "Tellurium in Copper Slime: The Critical Mineral Powering Clean Energy," examining tellurium's byproduct supply structure and growing clean-energy applications.
- 2026-09-02: Investing News Network reports that the report features First Tellurium's subsidiary PyroDelta Energy Corp. and its thermoelectric waste-heat recovery technology.
Demand Drivers
Demand for tellurium is currently led by cadmium telluride thin-film solar photovoltaic manufacturing, with an emerging second driver in thermoelectric waste-heat recovery technology, including PyroDelta's work targeting AI data centers, where an estimated 20% to 50% of global energy consumption is lost as waste heat.
Supply Drivers
More than 90% of global tellurium supply comes as a byproduct of copper anode slime recovered during electrolytic copper refining rather than from dedicated tellurium mines; economically viable primary tellurium deposits, such as First Tellurium's Deer Horn property in British Columbia, are exceptionally rare.
What could lift prices
- Tellurium demand is broadening beyond solar into thermoelectric waste-heat recovery, adding a second structural demand driver to a metal that already has limited primary supply.
- First Tellurium's Deer Horn property is one of very few known high-grade primary tellurium deposits outside China, a scarce-asset position in a byproduct-dominated market.
What could weigh on prices
- Because more than 90% of tellurium supply depends on copper refiners' own recovery decisions rather than dedicated mining, new tellurium supply cannot scale quickly even if demand accelerates — a structural constraint for downstream users more than a bearish signal for the metal itself.
Country impact
| Country | Impact | Reason |
|---|---|---|
| Canada | Medium | First Tellurium's Deer Horn property in British Columbia is one of the few known high-grade primary tellurium deposits outside China, giving Canada a rare potential source of dedicated tellurium supply. |
| United States | Medium | The bulk of both current tellurium demand drivers — CdTe solar manufacturing led by First Solar and the AI data-center buildout PyroDelta is targeting for waste-heat recovery — are concentrated in the United States. |
Industry impact
| Industry | Effect | Reason |
|---|---|---|
| Renewable Energy | Positive | Tellurium is the essential light-absorbing material in cadmium telluride thin-film solar panels, making its supply availability directly relevant to solar manufacturing capacity. |
| Data Center Infrastructure | Positive | PyroDelta's thermoelectric technology targets waste-heat recovery specifically at AI data centers, offering a potential new efficiency and power-recovery tool for the sector. |
Who gains, who loses
- Copper refiners with tellurium recovery circuits: As demand for tellurium broadens into solar and thermoelectric applications, copper refiners already positioned to recover it from anode slime capture additional revenue from what was previously waste.
- Solar and thermoelectric manufacturers reliant on tellurium: A supply base structurally tied to copper refining rather than tellurium's own economics leaves downstream manufacturers exposed to tight availability if demand grows faster than byproduct recovery can expand.
Other ways this could play out
- If thermoelectric waste-heat recovery technologies like PyroDelta's reach commercial scale, tellurium demand could grow faster than the copper-refining byproduct stream can supply, intensifying the constraint the CEO describes.
- If more copper refiners globally expand anode-slime tellurium recovery circuits, the way Rio Tinto's Kennecott operation has already done, byproduct supply could grow enough to ease that constraint without a new primary mine ever being developed.
Price risks
- Tellurium supply's dependence on copper refiners' own recovery decisions means a slowdown in copper refining activity could tighten tellurium availability independent of tellurium's own demand trends.
- A faster-than-expected ramp in thermoelectric waste-heat recovery demand could outpace the byproduct supply chain, given how few economically viable primary deposits exist.
Technical view
Price is trading below both its 20-period and 50-period moving averages, a bearish alignment.
Computed from metalscost.com's own stored price history.
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