How Zinc Mining Works and What Drives Miner Profits

Most people file zinc under “minor metals”, somewhere behind copper and gold in the pecking order. In fact, it is the fourth most used metal on the planet, and roughly 60% of all demand exists for one job: stopping steel from rusting. That makes zinc mining a quiet bet on construction, infrastructure and everything else built from steel.

The industry is also turning a corner. According to the International Lead and Zinc Study Group (ILZSG), global mine output reached about 12.6 million tonnes in 2025 on preliminary figures, up 5.4% on 2024. That followed several years of decline.

Supply is now rebounding as new mines come online. Whether a zinc investment rewards you or burns you depends less on the headline price than on where each producer’s margin actually comes from.

This gives you a working map of how zinc is extracted, who produces it, which deposits matter and what separates a resilient zinc miner from a vulnerable one.

How is zinc mined and turned into metal?

Every zinc story starts with a rock. The main ore is sphalerite, a zinc sulphide mineral (ZnS), usually found alongside lead and silver. Getting from that rock to a slab of refined metal takes three stages:

1. Mining: ore is dug from an open pit or an underground mine.
2. Flotation: crushed ore is mixed with water and chemicals so zinc minerals float off as a concentrate, a powder far richer in zinc than the original rock.
3. Smelting: the concentrate is sold to a smelter, which refines it into zinc metal.

Each stage takes its own cut of the value.

Open-cut versus underground mining

Open-cut mines move huge volumes of rock with large equipment. They usually work lower grades but at lower cost per tonne. Underground mines tunnel selectively into richer zones, paying more for labour, ventilation and ground support in exchange for higher grade.

Grade matters enormously. Ore grading 8-10% zinc is far cheaper per tonne of contained metal than ore at 3-5%.

Queensland’s Century mine shows the life cycle in action. It was a large open-pit operation whose conventional mining ended in 2015-2016, after which the site moved to reprocessing old tailings (the waste left after earlier processing).

From ore to refined metal

Flotation recovery depends on grain size and impurities such as iron and manganese. Clean, high-recovery concentrates fetch better terms.

Smelters charge a treatment charge (TC) per tonne of concentrate, plus penalties for impurities such as cadmium. When concentrate is scarce, smelters compete for feed and TCs tend to fall. When mines grow faster than smelters, TCs rise.

Your view of a miner’s margin changes once you see how treatment charges behave through the cycle, because a swing in smelter terms can erase the benefit of a higher zinc price for producers with impure or low-grade concentrate.

By-products can swing the economics the other way. Lead, silver and sometimes germanium earn credits that cut a miner’s net cost per tonne of zinc.

This tells you that two zinc miners with identical output can report very different profits. Grade, by-product credits and smelter terms shape your margin as much as the zinc price does.

Why zinc demand follows steel, and what that means for the cycle

The core use is simple. Galvanising means coating steel with a layer of zinc so it resists corrosion, and it is why zinc ranks behind only iron, aluminium and copper in global use.

Zinc’s anchor market Galvanising accounts for roughly 60% of global zinc demand, based on 2022 International Zinc Association and Statista data.

That simplicity is reassuring. It is also the source of your exposure.

The International Zinc Association confirms that the coating market represents nearly 60% of total zinc consumption each year, which is why your zinc exposure moves so closely with steel-intensive construction and infrastructure activity.

If most zinc ends up on steel, zinc demand is really a derivative of steel-intensive activity. ILZSG’s focus on end uses such as construction and air conditioners points to the same conclusion: Chinese property, infrastructure and consumer durables remain central to refined zinc consumption.

The forces pushing in each direction look like this:

• Drags: prolonged weakness in Chinese property, slower infrastructure spending, softer steel output
• Offsets: electricity grid build-out, infrastructure renewal elsewhere, autos, appliances and industrial equipment

Demand growth overall is modest. Zinc is not a high-growth battery metal story, and it should not be valued like one.

For you as an investor, this means a zinc position is partly a bet on steel demand and Chinese construction, not a standalone theme. If your portfolio already leans on iron ore or China-exposed industrials, adding zinc may repeat that risk rather than diversify it.

Where the world’s zinc comes from: producers and landmark deposits

Ask most sources who mines the world’s zinc and you will get a familiar list: China about 35%, Australia 12%, Peru 11%, India 8% and the US 7%. Those numbers are now out of date.

The 2025 league table

World mine output fell from 12.797 Mt in 2021 to 12.464 Mt in 2022, 12.208 Mt in 2023 and 11.945 Mt in 2024, before recovering to 12.586 Mt in 2025. Here is how the top producers stack up on ILZSG’s preliminary figures:

Peru now sits second, ahead of Australia. Mexico (776 kt, about 6.2%) actually out-produces the US, and Europe in aggregate delivered 1,078 kt. The US Geological Survey’s (USGS) 2026 estimates line up closely.

The 2025 rebound came from higher output in Australia, China, India, Iran, Peru, South Africa and the Democratic Republic of Congo (DRC). Kipushi in the DRC was commissioned in June 2024, and Ireland’s Tara mine restarted in October 2024.

Four deposits investors should know

• Red Dog (Teck, Alaska): USGS attributes the fall in US output in 2025 largely to lower grades as the mine nears the end of its life.
• Antamina (Peru): a polymetallic mine that shifted its 2025 plans toward more zinc ore, lifting Peruvian output.
• Dugald River (MMG, Queensland): an ongoing underground operation built on selective, higher-grade mining.
• McArthur River (Glencore, Northern Territory): a long-running case of regulatory scrutiny over river diversion, waste rock oxidation and groundwater.

Century is the cautionary aside. Once its primary ore ran out, value shifted to lower-capital tailings reprocessing.

This tells you supply is concentrated in a handful of jurisdictions. Policy in one country, depletion at one ageing mine or a permit fight at one asset can move the whole market, and your holdings with it.

What separates resilient zinc miners from vulnerable ones

Those concentration risks matter more now, because the market is moving out of a tight period and into one of fresh supply.

The supply and demand backdrop

New mines are adding real tonnage: Kipushi is ramping toward about 280 kt a year, alongside Ozernoye (320 kt/y), Tara (130 kt/y) and Buenavista zinc (100 kt/y). Smelting capacity is growing too, with Boliden’s Odda plant in Norway expanding from 200 kt to 350 kt in Q1 2025.

With demand growing only modestly, ILZSG’s outlook points toward a balanced or mildly surplus market. Treat even that view cautiously. In September 2024, ILZSG forecast 12.86 Mt of 2025 output; by October 2025 it had trimmed that to 12.51 Mt, and the preliminary actual landed at 12.586 Mt.

Forecasts move. Your screening criteria should not depend on any single one.

Forecasts keep shifting as new capacity ramps up, and the latest 2026 production forecast shows how a mildly surplus mine market could develop as Kipushi, Tara and other projects reach full rates.

Five risks to weigh

1. Chinese demand. Bear: property weakness caps steel and galvanising demand. Bull: grid, autos and appliances provide support.
2. Smelter capacity and TCs. Bear: new smelters plus recovering mine supply push TCs higher, hurting low-grade or high-penalty producers. Bull: project delays keep concentrate tight and TCs low.
3. Depletion and replacement. Bear: mature mines such as Red Dog lose output without new reserves. Bull: projects including Kipushi and Tara offset depletion, though with technical and financing risk.
4. ESG and permitting. Bear: water, tailings and community issues cause delays or restrictions. Bull: well-permitted operators gain scarcity value.
5. Price volatility. Bear: sustained low prices force closures. Bull: shocks reward low-cost producers with strong balance sheets.

What attractive exposure looks like Low costs, strong lead and silver credits, solid permits, a manageable jurisdiction and a balance sheet that can absorb price and TC swings.

Read this as a screening framework. Favour producers whose margins survive lower prices and higher treatment charges, not those that need a price rally to work.

Past performance does not guarantee future results. Production forecasts are subject to market conditions and various risk factors.

Reading the zinc cycle with a clearer lens

Zinc is a steel-linked metal with roughly 12.6 Mt of annual mine supply now rebounding after years of decline. The miner’s margin sits at the intersection of ore grade, by-product credits and the terms smelters demand.

Three variables deserve your ongoing attention: Chinese steel and construction demand, the balance between new mine supply and smelter capacity, and whether ageing assets can replace the ore they are running out of.

With that lens, you can test any zinc exposure against a single question. Is it low-cost and well-permitted, or does it depend on a price recovery? Apply it as you research individual producers and projects.

For investors wanting a transferable screening method, our dedicated guide to mining stock due diligence and position sizing explains how to filter producers by management and capital structure before geology.

This article is for informational purposes only and should not be considered financial advice. Investors should conduct their own research and consult with financial professionals before making investment decisions.