17 Most Environmentally Damaging Mining Companies (2026)

Albemarle has the least-negative environmental score in this selected comparison at −10; Peabody Energy has the lowest at −80. None of the 17 records below scores positively on Mashinii's Planet-Friendly Business dimension. That does not establish that every mining company worldwide has a negative score, or that the highest-ranked business is impact-free.

If you are looking for a sustainable mining company, use the comparison to identify questions for further research: which mines are included, what happens to water and waste, how emissions are measured, and who remains responsible after closure. A corporate score is a starting point, not a site-level sustainability certificate.

Environmental ranking: 17 mining and related company records

This preserves the original article's selected group, which includes mine operators, a metals streaming business and a steelmaker. It is not a like-for-like list of 17 mine operators. The latest stored environmental assessments date from April or July 2026, as shown below, and were checked on 8 October 2026. Higher is better; tied scores share a rank.

Every company name links to its evidence record. The group has a median score of −50, with a range from −80 to −10. These replace the outdated median of −30 and minimum of −60. We have removed the old overall averages: different coverage across unrelated dimensions made them a distracting way to rank environmental performance.

A numeric zero is a recorded score, not proof of no adverse evidence. A missing or unscored dimension must not be treated as zero. Read Mashinii's methodology alongside the underlying sources before interpreting any number.

Which is the most sustainable mining company?

This comparison cannot establish a universal winner. Albemarle's −10 is the highest environmental result in this selected set, not a positive endorsement of every project. The former article incorrectly gave it −30 and placed Wheaton first at −10; Wheaton's current environmental record is −40.

The answer also depends on the activity being compared. A lithium business, coal operator, gold miner and steel recycler have different products and operational boundaries. A responsible assessment needs evidence for the actual site or supply chain, not simply the highest number in a mixed group.

For a broader selection of poor environmental records, see companies with low environmental scores. That comparison also explains why a conduct score is different from an emissions-volume ranking.

Streaming, steelmaking and mining are different exposures

Wheaton describes its streaming model as providing an upfront payment and subsequent delivery payments in exchange for a portion of a mine's metals. Its sustainability disclosures state that it does not operate mines directly. A small direct operational footprint therefore does not answer every question about the mines connected to its business.

Nucor is included as a steelmaking and recycling comparator, rather than presented as another conventional mine operator. Its stored waste score is +40, while its environmental score is −30. Different dimensions can show different results without either cancelling the other. The previous +30 waste figure has been corrected.

These distinctions matter when interpreting “ESG mining company” comparisons. A broad sustainability label can conceal whether an assessment concerns the operator, a financing relationship, processing, or an individual asset.

Why Rio Tinto and the middle of the ranking changed

Rio Tinto, Newmont, Freeport-McMoRan, Eramet, KAZ Minerals, Vale, Gold Fields, the legacy Polymetal record and Teck all show −50 on this dimension. They should not be ranked against each other using an invented tie-breaker.

Several earlier positive community and governance claims were also inconsistent with the latest records. For example, Rio Tinto's community score is −50, not +25; Fresnillo's business-conduct result is +20, not +70. Those corrections remove the basis for the article's old claim that this small group demonstrated a relationship—or lack of one—between governance and environmental outcomes.

The environmental evidence still needs its own boundaries. Rio Tinto's 2025 climate disclosure reports value-chain emissions separately from direct and purchased-energy emissions. Compare equivalent scopes and years rather than treating a decline in one measure as proof that the entire footprint has improved.

Peabody and Glencore have the lowest scores in this group

Peabody Energy records −80, followed by Glencore at −60. Peabody's earlier −20 and Glencore's −40 are no longer the latest values. Teck's current −50 means it is not the lowest-scoring company here.

This is a ranking of stored assessments. It is not a claim that one company caused a particular amount of environmental damage relative to another, and the score alone cannot establish the facts of a specific incident. Open each profile and examine the dated sources supporting it.

Asset sales and old names change what you are comparing

Teck: the company completed the sale of its remaining 77% interest in its steelmaking-coal business to Glencore in July 2024. The earlier description of that business as an ongoing Teck operation was outdated. Historical responsibility and current ownership are separate questions.

Polymetal: the former international group announced completion of its Russian-business divestment in March 2024 and rebranding as Solidcore Resources in June 2024. The table explicitly labels Mashinii's POLY.LSE entry as a legacy record; it should not be treated as an automatically reconciled assessment of today's combined Russian and Kazakh operations.

Barrick: the company changed its name to Barrick Mining Corporation in 2025, with the NYSE symbol changing to B. Our existing ABX.US URL is a database identifier, not a statement that ABX is its current US trading symbol. These record-mapping limitations deserve attention before using the table to evaluate holdings.

What evidence should a sustainable-mining assessment include?

Look beyond a headline net-zero commitment. Useful questions include whether water withdrawals and discharge are reported by site, how tailings risks are governed, what closure obligations remain, and whether affected communities can inspect and challenge the evidence.

The Global Industry Standard on Tailings Management, developed through UNEP, PRI and ICMM, addresses facility lifecycle risks, affected people, accountability and disclosure. Its existence is not proof that every company in this table complies, or that compliance eliminates all risk. Look for facility-specific implementation and assurance evidence.

Company reports can help establish what a company says and measures; regulator records, court documents and other evidence can test those accounts. Neither an allegation nor a corporate policy should be silently converted into an established outcome.

What about Anglo American and Antofagasta?

The previous article described these as showing zero across every dimension. Their current environmental records are Anglo American −50 and Antofagasta −40. They are outside the retained 17-record comparison, but neither should be labelled unassessed on the basis of the old text.

Use company search to inspect the exact business you are researching. A useful comparison pairs the environmental score with dated, site-specific evidence and a clear account of ownership and reporting boundaries.

Reviewed and corrected 8 October 2026: reconciled all environmental values, ties and median; removed incorrect overall averages and positive-score claims; added source-backed ownership and name changes, and identified legacy record limitations. Original publication date preserved.