Zinc

Europe's Zinc Smelter Collapse: How the 2021–2024 Energy Crisis Shut Half the Continent's Capacity

Nyrstar, majority owned by trading house Trafigura, was the first and hardest hit. The company cut output by up to 50% across its three fully electrified European smelters — Budel (Netherlands, 315kt nameplate), Balen (Belgium), and Auby (France) — from October 2021, citing electricity costs that had "continued to escalate in recent weeks in France, surpassing those of neighboring countries" (Argus Media, 13 Oct 2021). Auby was placed on full care and maintenance in January 2022 before resuming partial output in March 2022 (Euronews, 19 Mar 2022; Reuters, 16 Dec 2021).

Budel was the most severely affected site, twice placed into extended care and maintenance. Nyrstar first idled the 315,000-tonne-per-year plant from 1 September 2022 "as a response to various external factors," with a source telling Reuters that electricity costs had "surged by as much as tenfold" (Reuters, 16 Aug 2022; Nyrstar press release, 16 Aug 2022). It restarted at reduced capacity but was idled a second time in January 2024, with Nyrstar stating the decision followed "persistent and anticipated high energy costs alongside worsening market circumstances," and explicitly blaming the Dutch government's decision to end indirect cost-compensation support for energy-intensive industry, which left Budel "at a significant disadvantage compared to similar operations in other European member states" (Reuters, 15 Jan 2024 (copy: Yahoo Finance); Nyrstar press release, 30 Apr 2024). Budel restarted again in May 2024 after the Netherlands temporarily reinstated indirect cost compensation (Nyrstar, 30 Apr 2024).

Glencore's Portovesme smelter in Sardinia, Italy (100,000 tonnes per year, primary zinc sulphide line) was placed on care and maintenance from the end of 2021, "prompted by the elevated power costs observed in Italy and across Europe," while its secondary (recycling) zinc line continued operating (Reuters, 22 Nov 2021). Glencore's other European zinc assets — Nordenham in Germany (165,000 tpa) and San Juan de Nieva/Asturias in Spain (510,000 tpa) — also throttled production in response to peak pricing through 2022, and Nordenham itself was placed on care and maintenance from 1 November 2022, becoming the third major West European zinc smelter closure inside a year (Mining.com, 6 Oct 2022; Reuters (Andy Home), 9 Aug 2022).

Why it matters: a joint CEO letter from Europe's non-ferrous metals producers to European Commission President Ursula von der Leyen warned that "50% of the EU's aluminium and zinc capacity has already been forced offline due to the power crisis," with Goldman Sachs estimating 750,000 tonnes of suspended zinc capacity — 45% of total EU production — on top of a further ~160kt cut at Nyrstar Balen. Boliden's Norwegian and Finnish zinc smelters and Bulgaria's KCM smelter also curtailed at times of peak electricity pricing (European non-ferrous metals CEO letter to the European Commission, 6 Sep 2022). Macquarie estimated that energy costs had risen to roughly 80% of European zinc production costs by August 2022, up from a historical average of 50% (Reuters, 17 Aug 2022).

Trafigura's Nyrstar Problem: Impairments, Restructuring and the Limits of Vertical Integration

Trafigura took majority control of Nyrstar in 2019 through a debt-for-equity restructuring, giving the trading house direct exposure to zinc smelting margins rather than just concentrate trading (Mining.com, 15 Apr 2019; Reuters, 15 Apr 2019). That integration strategy was tested severely by the 2021–2024 European energy crisis: with European smelters running at negative or near-zero margins for extended periods (Section 1) and global treatment charges collapsing to record lows and even negative territory by late 2024 (Section 3), Nyrstar's European assets became a persistent drag on Trafigura's group results.

Nyrstar's own corporate vehicle, Nyrstar NV (the Belgian-listed legacy entity, distinct from the operating business Trafigura controls), has separately disclosed an ongoing restructuring involving a EUR 13.5 million funding facility split between an operating-costs tranche (EUR 8.5 million) and a litigation-defence-costs tranche (EUR 5 million), with mandatory repayment triggers tied to any future disposal of its stake in "NN2 NewCo Ltd" — the entity structure underlying the group's operating assets (Nyrstar NV Investor FAQs).

Trafigura's FY2025 annual results confirm the financial toll continuing into the current period: group impairments of fixed and financial assets were USD 843 million, down from USD 1,074 million in FY2024, but the company specifically flagged "fixed asset impairment charges totalling USD 340.5 million, in relation to Nyrstar Australia, Myra Falls mining, Greenergy's closure of its Immingham plant and a number of other assets" (Trafigura, 2025 Annual Results Financial Review, 9 Dec 2025). Myra Falls, a zinc-copper mine on Vancouver Island, Canada, that Trafigura had targeted as a Western concentrate source to feed its own smelters, is a direct casualty of the same margin compression squeezing miners and smelters simultaneously — low metal prices and negative treatment charges erode profitability at both ends of the supply chain at once.

Why it matters: Nyrstar is one of the few remaining vertically integrated zinc majors with both Western mining and Western smelting assets, making its financial health a bellwether for whether non-Chinese zinc smelting can remain viable without structural government support. The European Bank for Reconstruction and Development (EBRD) and other European institutions have been the subject of industry lobbying for critical-minerals-linked support mechanisms for EU-based base-metals smelters, though no EBRD facility specific to Nyrstar's European smelters has been publicly confirmed as of mid-2026; the clearest government intervention to date has been the temporary Dutch indirect-cost-compensation reinstatement that enabled Budel's 2024 restart (Section 1).

Treatment Charges in Freefall: How a $274/t Fee Became Negative in 18 Months

The mechanism at work is textbook but the magnitude was unprecedented: treatment charges (TCs) are the fee miners pay smelters to convert concentrate into refined metal, and they move inversely with concentrate scarcity. Wood Mackenzie data presented to the International Lead and Zinc Study Group (ILZSG) in September 2024 showed the realized annual China domestic TC (including price participation) falling from over $300/t in 2020–21 to the $165/t benchmark, itself 30% below 2023, and warned that "almost 10% of rest-of-world (excluding China) zinc smelters suffer cash margin loss at benchmark TC of $165/t" (Wood Mackenzie presentation to ILZSG, Sep 2024). By August 2024, SMM estimated Chinese smelter losses (excluding by-product credits) had exceeded 2,500 yuan/tonne (Shanghai Metals Market, 23 Aug 2024).

The proximate cause was a run of mine-supply disruptions rather than a demand shock: Reuters reported in October 2024 that "in April, ILZSG had predicted a 0.7% increase in mine production for 2024" but that this was revised to a 1.4% decline, and that sanctions-related delays at Russia's Ozernoye mine (see Section 6) directly contributed to the miscalculation, pushing what had been forecast as a 56,000-tonne annual surplus into what was briefly expected to be a 164,000-tonne deficit (Reuters, 9 Oct 2024; International Lead & Zinc Study Group (ILZSG)). BofA Securities noted that operators remained "profitable on 2024 annual contracts" but were "loss-making if they procure feedstock on the spot market" (Investing.com citing BofA Securities, 28 Aug 2024).

Recovery through 2025–2026 as new mine supply arrives

The squeeze began easing once Kipushi (DRC, Ivanhoe Mines) and Ozernoye (Russia) ramped concentrate output, alongside the restart of Ireland's Tara mine and higher output from Australia, Peru, and China. ILZSG's October 2025 press release recorded world zinc mine production rising 4.6% to 12.51 million tonnes in 2025 after declines in both 2023 and 2024, with a further 2.4% rise to 12.80 million tonnes forecast for 2026 (ILZSG press release, 13 Oct 2025). Fastmarkets and StoneX both expect the 2026 benchmark TC to climb back toward the $150–160/t range as new mine supply reaches the market, though the pace depends heavily on how quickly greenfield projects ramp to nameplate capacity (Rzzro Intelligence, 10 Jun 2026).

Global Supply: China's Smelting Dominance Versus a Fragmented Mining Base

Source: USGS Mineral Commodity Summaries 2026, zinc chapter. Global identified zinc resources are estimated at approximately 1.9 billion tons, and Australia's Joint Ore Reserves Committee-compliant reserves are separately reported at 19 million tons, materially below the 164-million-ton figure USGS carries under its own reserve definitions (USGS MCS 2026).

U.S. mine production down 12% as Red Dog ages out

USGS attributes an estimated 12% decline in U.S. zinc mine production in 2025 "mostly owing to a decrease in production at the Red Dog Mine in Alaska owing to lower ore grades as the operation approached the end of its mine life," while operations at the Middle Tennessee zinc mines have been suspended since November 2023, with drilling during the closure aimed at defining additional zinc, germanium, and gallium resources. Domestic project development includes the restart of the Bunker Hill Mine in Idaho and the opening of the Hermosa project in Arizona (USGS MCS 2026). U.S. net import reliance for refined zinc stood at 73% in 2025, with refined-metal imports sourced 56% from Canada, 15% from Mexico, 9% from Peru, and 7% from Korea (USGS MCS 2026).

China's domestic mine slowdown squeezes its own smelters

China's refined zinc output has been volatile even as its smelting capacity keeps expanding: Discovery Alert's July 2025 analysis of Chinese producer data shows refined output growth of roughly 1.2% in 2023 turning into a 3.6% decline in 2024, followed by a further roughly 3% year-on-year reduction in the first five months of 2025 (2.92 million tonnes total), as domestic mine concentrate could not keep pace with installed smelting capacity (International Lead and Zinc Study Group — Statistics). By 2025, however, ILZSG's February 2026 press release recorded a rebound: global refined zinc output rose 2.1% in 2025, "driven largely by China, where output climbed 6.1%, while refined production outside China fell 1.6%," and global mine production increased 5.4%, led by Australia, China, India, Iran, Peru, South Africa, and the DRC, plus European gains from the restart of Ireland's Tara mine (Miningreporters.com summarizing ILZSG, 26 Feb 2026).

ILZSG balance: deficit years give way to a projected surplus

ILZSG's October 2025 outlook forecasts global refined zinc demand rising 1.1% to 13.71 million tonnes in 2025 and 1% to 13.86 million tonnes in 2026, against refined production of 13.80 million tonnes in 2025 (up 2.7%) and 14.13 million tonnes in 2026 (up a further 2.4%), implying the market moves from deficit in 2023–2024 to a modest 2025 surplus and a larger 271,000-tonne surplus in 2026 (ILZSG press release, 13 Oct 2025; USGS Mineral Commodity Summaries 2025 — Zinc). USGS's own February 2026 assessment converges on a similar figure: an 85,000-tonne production-to-consumption surplus for 2025, "mostly owing to the commissioning of a significant amount of refining capacity in China" (USGS MCS 2026).

The 2025 LME Zinc Squeeze: Stocks Fall 85%, Backwardation Hits the Widest Since 1997

The mechanics of the squeeze differed from the smoother stock declines of prior years. Throughout 2024, Reuters columnist Andy Home noted, nearly 700,000 tonnes of zinc were shuttled in and out of Singapore LME warehouses under "rent-sharing" arrangements between trading houses and warehouse operators, leaving the net inventory change a modest 35,550-tonne increase despite the heavy churn. Starting in early 2025, that pattern broke: "zinc was being withdrawn from LME registered stocks without reappearing in off-warrant reserves ready for new warranting at alternative warehouses" (Reuters (Andy Home), 22 Oct 2025). Singapore customs data showed SHG zinc ingot exports surging past 50,000 tonnes in August 2025 alone, with seven-month 2025 exports of 189,700 tonnes already exceeding all of 2024's 154,500 tonnes, while imports fell 81.3% year-on-year — metal was leaving the LME system for good rather than recirculating (Shanghai Metals Market, 27 Oct 2025).

The concentration data underpinning the squeeze was unusually stark. LME position reports for 18 July 2025 showed "investment firms and credit institutions" holding 57.41% of total open interest, and Shanghai Metals Market's analysis of the July 2025 rally described a "surge in cancelled warrants" from under 20% to roughly 50% of total LME zinc inventory in a single week, which it linked to "a small number of participants...accumulating long positions in front-month contracts while controlling a significant proportion of the cancelled warrants" — a pattern SMM explicitly compared to "one major trader" who in October 2024 "reportedly held over 40% of recent-month zinc open interest and stockpiled 50–80% of LME zinc warrants" (Shanghai Metals Market, 23 Jul 2025). By 21 October 2025, LME data confirmed "the top six entities with long positions in near-term contracts are collectively holding more than 300% of the available stock in LME warehouses," while the tom-next spread — the cost of rolling a short position by a single day — spiked to $30/tonne, matching the highest level since the 2022 nickel-era base-metals squeeze cycle (Mining.com, 21 Oct 2025).

Why it matters: the squeeze occurred despite ILZSG projecting a 271,000-tonne global surplus for 2026 — a reminder that LME registered stock is a narrow, geographically specific pool (dominated by Singapore) that can diverge sharply from the true global physical balance. Marex strategist Al Munro observed that "the reality is the backwardations on the LME are yet to attract material and stock inflows," underscoring that high prices alone did not immediately solve the delivery-point shortage (Mining.com, 21 Oct 2025).

The Producers: Hindustan Zinc's Expansion Bet, Sanctioned Ozernoye, and the Mid-Tier Miners

1. Hindustan Zinc: India's integrated silver-lead-zinc champion doubles down

Hindustan Zinc, majority owned by Vedanta Limited, announced plans in October 2024 to invest up to USD 2 billion (later reported as up to USD 2.5 billion) to double its production capacity, targeting milestones of 1.2 million tonnes in 2025, 1.35 million tonnes in 2026, and 1.8 million tonnes in 2027 en route to an ultimate 2-million-tonne goal by 2030 (Economic Times, 27 Oct 2024; IndiaInfoline, 27 Oct 2024). In June 2025 the company committed roughly INR 12,000 crore (about USD 1.4 billion) toward a new smelter in Rajasthan as part of that expansion (Business Standard, 17 Jun 2025). By April 2026, Hindustan Zinc was reportedly still targeting the 2030 doubling and separately considering reviving a demerger plan for its businesses (Economic Times, 25 Apr 2026). The company's integrated model recovers silver and lead alongside zinc from the same ore bodies at its Rajasthan operations, and Vedanta's FY2025 operational review confirms Hindustan Zinc is separately developing a prototype rechargeable zinc-air battery with IIT Madras and JNCASR (Vedanta Limited, FY2025 Operational Review). Parent company Vedanta was separately reported in April 2025 to be seeking a global partner for a broader USD 20 billion group expansion plan (Reuters, 2 Apr 2025).

2. Ozernoye: Russia's largest zinc mine, built under sanctions

Ozernoye, in Siberia's Buryatia region, was designed to produce up to 350,000 tonnes of zinc in concentrate annually — enough, according to Russia's Minister for the Far East and Arctic Aleksey Chekunkov, to represent 4% of global output at full capacity (Mining.com, 12 Dec 2023). The United States sanctioned the project's owner, metals magnate Vladislav Sviblov, along with Ozernaya Mining Company itself, in December 2023, following earlier UK sanctions on Sviblov in November 2023 (Mining.com, 12 Dec 2023). A fire in November 2023 damaged imported processing equipment, and the sanctions then "made it hard to find a replacement abroad," delaying first concentrate production until at least Q3 2024 and full ramp-up until 2025 (Reuters via Investing.com, 5 Feb 2024). Concentrate production finally began in September 2024 (Mining.com, 4 Sep 2024). Reuters reported in October 2024 that Glencore, which had previously supplied concentrator components, "can no longer supply the concentrator parts to Ozernoye" because of the U.S. sanctions, forcing the project to find alternative equipment sources and directly contributing to the 2024 global TC crisis documented in Section 3 (Reuters, 25 Oct 2024). The sanctions have also structurally reoriented Ozernoye's customer base toward China, "cementing its dependence on future demand in top consumer China" (Reuters via Investing.com, 5 Feb 2024).

3. MMG's Dugald River and the mid-tier Australian/mid-cap producer base

MMG's Dugald River mine in Queensland, Australia, targeted 2025 zinc-in-concentrate production of 170,000–185,000 tonnes, described by the company as "a return to previous production levels," with C1 costs guided at USD 0.75–0.90/lb, higher than 2024 owing to lower assumed by-product prices and higher assumed zinc treatment charges (MMG Fourth Quarter Production Report, 23 Jan 2025). MMG's Rosebery mine in Tasmania guided 2025 zinc production of 45,000–55,000 tonnes (110,000–125,000 tonnes zinc-equivalent including by-products), with the company noting a deliberate "shift in focus towards by-product production" given the weak treatment-charge environment (MMG, 23 Jan 2025). MMG's own commentary in its Q1 2024 production report explicitly linked "additional disruptions in zinc mine production and mine closures worldwide" to treatment charges "trading between a US$55–$75 per tonne level," and confirmed the Teck–Korea Zinc 2024 benchmark settlement at $165/t, "a significant decrease from the 2023 annual zinc concentrate benchmark treatment charge of US$274 per tonne" (MMG First Quarter Production Report, 23 Apr 2024).

Boliden (Sweden/Finland/Norway) and Nexa Resources (Brazil/Peru) round out the mid-tier producer base referenced across ILZSG and USGS country-level statistics in Sections 3 and 4; Boliden's Nordic smelters were among those curtailing output during the 2022 European energy crisis (Section 1), while Nexa's Peruvian and Brazilian mines contribute to the Peru and Brazil production figures behind the 2025 mine-supply recovery. Neither company disclosed metal-specific restructuring or sanctions events of the scale seen at Nyrstar or Ozernoye during the period covered by this review; their production trends track the broader country-level statistics already cited from USGS and ILZSG in Sections 3–4.

Demand Side: Galvanized Steel Remains King, With Renewables as the Marginal Growth Driver

1. Galvanizing: automotive and construction anchor the market

USGS confirms that "of the total reported zinc consumed" in the United States, "most was used to produce galvanized steel, followed by brass and bronze, zinc-base alloys, and other uses," and separately states that "galvanized steel was the leading use of refined zinc in the United States, which was used widely in the automobile and construction end markets" (USGS MCS 2026). Zinc's role in automotive galvanizing is protective corrosion coating for structural steel and outer body panels, and in construction spans structural steel, rebar, guardrails, and roofing. Industry market research on the global galvanized steel market continues to project multi-year growth through the early 2030s, driven by infrastructure investment and vehicle-production trends, though as USGS notes the largest single U.S. use case remains automotive and construction galvanizing rather than any single emerging application (Grand View Research, Galvanized Steel Market Report).

2. Renewable energy: wind towers and solar mounting as the growth wedge

The International Zinc Association identifies renewable energy infrastructure explicitly as a use case for galvanized zinc coatings, citing the corrosion-protection requirements of wind turbine towers and the structural steel supporting solar installations, both of which require multi-decade service life in outdoor, often coastal or exposed environments where zinc's sacrificial corrosion protection is well-established (International Zinc Association, Renewable Energy). Zinc-aluminium-magnesium (Zn-Al-Mg) coated steel in particular has been marketed as an upgrade over pure zinc or aluminum coatings for solar racking and mounting structures, with suppliers citing improved long-term corrosion resistance in the field after industry events such as SNEC 2026 (Art Sign Energy, solar mounting steel commentary, 2026). CRU Group's analysis frames renewables broadly — wind, solar, and the broader electricity infrastructure buildout — as a structural net positive for zinc demand over the medium term, even as growth rates in mature end markets like construction remain slower (CRU Group, Zinc demand to benefit from growth in renewables).

3. China's construction slowdown as a demand-side drag

China's own zinc demand is closely tied to its construction sector, which Reuters described as having "had a patchy post-pandemic recovery" — a demand-side headwind that compounds the supply-side story of Chinese smelter overcapacity documented in Section 4 (Reuters via Investing.com, 5 Feb 2024). Because China is both the largest zinc producer and the largest zinc consumer, weakness in Chinese property and infrastructure construction directly affects the global galvanizing demand base that underpins roughly half of total zinc consumption, independent of the renewables-driven growth wedge described above.

Why it matters: unlike some critical minerals where a single emerging application (EV batteries, semiconductors) is reshaping the entire demand picture, zinc's demand structure remains dominated by a century-old use case — corrosion-resistant galvanized steel — that scales with global steel production, automotive output, and construction activity. This makes zinc demand less volatile but also less exposed to the kind of geopolitically driven demand surge seen in battery-metal markets; the more significant swing factor for zinc prices has been supply-side disruption (Sections 1–3 and 6), not a step-change in demand.

Beyond the Smelter: Recycling Infrastructure, Zinc-Based Batteries, and ESG Exposure

1. Recycling: EAF dust and the Waelz kiln as the secondary-zinc backbone

Refined zinc produced in the United States is recovered from secondary materials at both primary and secondary smelters, and per USGS "these secondary materials included galvanizing residues and crude zinc oxide recovered from electric arc furnace dust" (USGS MCS 2026). Electric arc furnaces used in steel recycling volatilize the zinc coating on galvanized steel scrap into a zinc-rich flue dust; this EAF dust is classified as a hazardous waste in most jurisdictions because of associated heavy metals, and the standard industrial recovery route is the Waelz kiln process, in which EAF dust is combined with a carbon reductant and processed in a rotary kiln to produce Waelz oxide, a crude zinc oxide concentrate (60–65% zinc) that is then further refined (Waelz process overview; Materials journal, Recovery of Zinc and Iron from Steel Mill Dust, 2022). The International Lead and Zinc Study Group has published dedicated technical material on zinc recovery from EAF dust, describing it as "a significant source of secondary zinc" for the global industry (ILZSG, Zinc Recovery from EAF Dust). This recycling loop is structurally tied to the galvanized-steel demand base itself: every tonne of galvanized automotive or construction steel that is eventually recycled through an EAF becomes a future zinc feedstock source, making the Waelz-kiln route a long-lag but reliable secondary supply channel distinct from primary mine concentrate.

2. Zinc-based batteries: Eos, EnZinc, and the lead-acid replacement thesis

Eos Energy Enterprises (Nasdaq: EOSE) manufactures zinc-bromine battery energy storage systems under its Znyth chemistry, targeting long-duration (3–12 hour) utility, industrial, and commercial applications as an alternative to lithium-ion, describing its technology as "safe, scalable, efficient, sustainable, manufactured in the U.S." (Eos Energy Enterprises press release, 28 May 2025). In November 2024, the U.S. Department of Energy's Loan Programs Office closed an up to USD 305.3 million loan guarantee (USD 277.5 million principal plus USD 26 million capitalized interest) to finance two manufacturing lines for Eos's next-generation Z3 zinc-bromine battery system in Turtle Creek, Pennsylvania, with all four planned lines expected to manufacture over 8 GWh of annual storage capacity by 2026–2027 — enough to instantaneously power more than 300,000 average U.S. homes (U.S. Department of Energy, Loan Programs Office, Eos project summary). Eos reported its highest-ever quarterly revenue in Q3 2025 and guided full-year 2025 revenue of USD 150–160 million (Eos Energy Enterprises, Q3 2025 results, 5 Nov 2025), and in October 2025 announced a 228 MWh order with Frontier Power under a broader 5 GWh framework agreement (Eos Energy/Frontier Power announcement, 31 Oct 2025).

EnZinc (Richmond, California) pursues a different architecture: a patented zinc "microsponge" anode designed as a drop-in upgrade for existing lead-acid battery manufacturing lines, producing nickel-zinc batteries that the company says triple the effective output of a converted lead-acid factory while eliminating the dendrite formation that historically made rechargeable zinc batteries impractical (EnZinc corporate site; ASME, Zinc is proving stubborn in efforts to improve on lithium-ion batteries). In October 2025, EnZinc announced a Joint Development Agreement with an unnamed major lead-acid battery manufacturer to bring its "Enzinc Inside" nickel-zinc technology to market, following a California Energy Commission-funded project (Publication CEC-500-2024-092) that the Commission said "successfully achieved its objectives, including the development of a large format commercial-size zinc sponge anode, a nickel-zinc cell, a nickel-zinc stationary energy storage battery, and a zinc anode fabrication line" (Octet Scientific, Aqueous Battery Brief, 23 Oct 2025; California Energy Commission, CEC-500-2024-092).

Why it matters, and why it's still nascent: both Eos and EnZinc target the lead-acid and stationary-storage markets rather than the much larger EV lithium-ion market, meaning zinc-based battery demand is not yet a material draw on refined zinc supply relative to the 13.7-million-tonne global galvanizing-dominated market. Eos's 2025 revenue guidance of USD 150–160 million implies a battery-grade zinc consumption footprint that remains a rounding error against global refined output, even as the technology matures. The genuine long-term upside case is a partial displacement of the USD 50–77 billion global lead-acid battery market, which EnZinc has cited directly as its target opportunity (Tamarindo, 4 Dec 2023).

3. ESG exposure: cadmium as a toxic byproduct, tailings dams as the structural mining risk

Zinc ore bodies, particularly sphalerite deposits, frequently contain cadmium as a minor but toxic associated element that must be separated during refining; cadmium recovered from zinc processing is itself an internationally regulated hazardous byproduct requiring dedicated handling, and a global mineral-resource assessment of cadmium published in Environmental Research Letters frames cadmium supply as fundamentally a function of zinc-mining and zinc-refining decisions rather than dedicated cadmium mining (Werner et al., Environmental Research Letters, Cadmium: a global assessment of mineral resources, 2024). Canada's federal government has published a formal risk-management scope document for zinc and soluble zinc compounds, stating the environmental objective is "to reduce anthropogenic releases of zinc and soluble zinc compounds to water so as not to exceed levels observed to cause adverse effects to aquatic organisms," reflecting zinc's own status as a regulated aquatic contaminant at elevated concentrations despite being a biologically essential trace element at low doses (Environment and Climate Change Canada, Risk Management Scope for Zinc).

Tailings dam integrity is a sector-wide structural risk for all sulphide-ore base-metals mining, including zinc-lead-silver operations, not a zinc-specific hazard; peer-reviewed geochemical research on lead/zinc mine tailings has specifically documented "the geochemical and mineralogical controls on the release characteristics of potentially toxic elements" from these tailings, underscoring that the same polymetallic ore bodies that make zinc mining economically attractive (silver, lead, cadmium as by-products) also concentrate the toxic-release risk in tailings storage facilities (Science of the Total Environment, geochemical controls on Pb/Zn mine tailings, 2022). BHP's own public ESG briefing on tailings dams — while not zinc-specific — documents the industry-wide governance response following catastrophic failures elsewhere in the sector, a framework that applies equally to zinc-lead-silver tailings facilities operated by companies such as Hindustan Zinc, Boliden, and MMG (BHP, ESG briefing: Tailings dams, 2019).