Mine Tailings Dewatering Patents: Leaders & Filing Trends 2026
- 42.5% concentration. The top five assignees hold 288 of the 678 records in scope — a genuinely concentrated field rather than a fragmented one.
- Filings cooled after 2021. Filings ran 62 in 2021 down to 21 in 2024, a 66% pullback over the last complete three-year span.
- Water treatment dominates the claim map. C02F covers 54.9% of records and B01D 33.9%, leaving flotation, solid-waste disposal and testing classes comparatively thin.
Filing growth compares 2021 (62 records) with 2024 (21) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field. Top-5 share is the combined record count of the five largest assignees divided by all 678 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
Mine tailings dewatering sits at the intersection of mineral processing and water management: separating solids from process water fast enough, and completely enough, to cut the need for wet tailings storage. The search underlying this page captures 678 published records filed or published between 2015 and mid-2026, spanning slurry dewatering, mine waste filtration and related mineral separation methods. Patent families, not raw document counts, are the fairer unit for comparing assignees, since a single invention can generate several continuation filings in one jurisdiction.
Filing activity peaked in 2020 at 64 records and has since eased, with the most recent complete year, 2024, sitting well below the 2021 level. Because publication typically lags filing by around 18 months, the 2025 and 2026 figures are still filling in and should not be read as a decline in inventive activity.
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Filing trends and technology composition
Two views of the same 678-record dataset: how filing volume has moved year over year, and which IPC subclasses carry the claim density today.
Filing trend, 2017–2026
Filings rose from 55 in 2017 to a peak of 64 in 2020, then fell across the most recent complete span — 62 in 2021 down to 21 in 2024, a 66% drop. Treat 2025 and 2026 as provisional given publication lag.
Technology composition by IPC subclass
C02F (water and wastewater treatment) touches 54.9% of the 678 records and B01D (separation processes) 33.9%, confirming that most inventive activity frames dewatering as a water-treatment or filtration problem. C10G, B03B and B03D each cover a meaningful minority, while B09B (solid waste disposal) and G01N (testing) sit under 10%, the areas with the least claim density.
Shares are the percentage of the 678 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Tailings & Mine-Waste Management: Mine Tailings Dewatering Patent Landscape with Eureka
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Try EurekaRepresentative filing and most-cited prior art
Systems and Methods For Dewatering Mine Tailings With Water-Absorbing Polymers
Systems and methods for dewatering mine tailings with water-absorbing polymers. The systems and methods may include combining a mine tailings slurry, which includes mine tailings and water, with a water-absorbing polymer. The water-absorbing polymer may absorb water from the mine tailings, thereby increasing a solids content of the mine tailings. The mine tailings may be combined with the water-absorbing polymer prior to, during, and/or subsequent to transfer of the mine tailings to a mine tailings dewatering and/or disposal site. In some embodiments, the water-absorbing polymer may be an encapsulated water-absorbing polymer.Filed by ExxonMobil Upstream Research Company, published 2014-10-16 — a chemistry-based dewatering route distinct from mechanical filtration or flotation.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5006239A | apparatus for treatment of oily sludge | 51 |
| 2 | US20170175228A1 | Recovery of lithium from silicate minerals | 50 |
| 3 | US20180111131A1 | Reducing the need for tailings storage dams in the iron ore industry | 41 |
| 4 | US20110017676A1 | Flotation aids and processes for using the same | 39 |
| 5 | US20090139906A1 | Isoelectric separation of oil sands | 36 |
| 6 | US20100187181A1 | Method for Dispersing and Aggregating Components of Mineral Slurries | 34 |
| 7 | WO2005033024A1 | Dewatering treatment system and method | 30 |
| 8 | US20130075340A1 | Oil sands fine tailings flocculation using dynamic mixing | 29 |
| 9 | US20120138542A1 | Process for improving inline tailings treatment | 28 |
| 10 | CN102343304A | 一种铁矿尾砂综合利用方法 | 25 |
Citation counts favour older filings by construction — a searched corpus accumulates citations over time, so these numbers signal historical influence on the field, not which claims matter most today.
Patent titles are shown in the language they were filed in, not translated, so that each record stays verifiable against the original filing — a translated title will not match in Eureka or in any national register. Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the data means for filing strategy
Three findings that shape where a new filing is likely to face dense prior art, and where it is not.
The field has a clear head, not a flat distribution
The leading assignee alone accounts for 138 records, and the top five combined hold 288 of the 678 records in scope. That is a meaningfully concentrated field: a new entrant filing on core dewatering chemistry or equipment is filing into occupied ground, while a long tail of single- and few-filing entities suggests room at the margins.
Filing volume has pulled back from its 2020 peak
Activity peaked at 64 records in 2020, then declined across the following complete years to 21 in 2024. This does not necessarily mean the technology is exhausted — it can also reflect consolidation of claims by the leaders already holding position, or a shift in filing toward adjacent classes not captured by this search string.
Water-treatment framing dominates over pure separation
More than half of records touch C02F (water and wastewater treatment), well ahead of B01D (separation processes) at a third. That gap suggests most applicants are claiming dewatering as a treatment outcome — water quality, chemical dosing, discharge — rather than purely as a mechanical or physical separation step.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to tailings & mine-waste management: mine tailings dewatering patent landscape, with the prior art for and against each one.
Assignee landscape and where activity is thinning
The ranked leaders account for a majority of filings, but recent-year momentum shows several of them slowing to zero in the latest tracked year — a signal to check freedom-to-operate before assuming a position is still actively defended.
A single assignee holds nearly a fifth of the field
The top-ranked assignee's 138 records dwarf the fifth-place holder's 27, indicating a filer that has built a genuinely defensive portfolio around core dewatering methods rather than a single flagship patent.
Several established filers show zero activity in the latest tracked year
Multiple assignees that built substantial portfolios earlier in the window show no new filings in the most recent year, including year-over-year drops of -100% for some. Given publication lag, this may understate 2025–2026 activity that has not yet published, but it is still worth checking directly before assuming a filer has withdrawn.
Canada and the US lead receiving offices, with Australia close behind
Canada (157) and the United States (141) are the largest receiving offices, consistent with oil sands and hard-rock mining activity in both countries; Australia (83), WIPO/PCT (61), Europe (52) and South Africa (35) round out the geographic spread.
| Assignee | Recent year | YoY |
|---|---|---|
| Suncor Energy Inc. | 0 | — |
| GRAYMONT WESTERN CANADA INC | 0 | -100% |
| Anglo American Group Services South Africa (Pty) Ltd | 0 | — |
| Locus Solutions IPCO LLC | 0 | -100% |
| FLSmidth & Co. A/S | 0 | — |
| Kemira Oyj (Finland) | 0 | — |
| Ausmetec Pty Ltd | 0 | — |
| Sortwell & Co. | 0 | — |
Where to take this analysis
The dataset points to specific questions worth running deeper before committing filing budget or freedom-to-operate review time.
Check freedom-to-operate against the top holder
With 138 records concentrated in one assignee, any new filing on core dewatering chemistry or equipment should be checked against that portfolio's claim scope before drafting.
Run a freedom-to-operate search in Eureka →Track whether zero-filing leaders have truly stopped
Several established assignees show zero filings in the latest year; publication lag means this could reverse. Monitoring their filing behaviour over the next two quarters will clarify whether the field is consolidating or simply catching up on publication.
Set up assignee monitoring in Eureka →Explore the under-claimed branches directly
Sensing, dosing optimisation and modular dewatering units show thinner IPC density than the core water-treatment classes. A focused prior-art search on each before drafting will confirm whether that thinness reflects real white space or simply a different classification pattern.
Explore white space with Eureka →Common questions on mine tailings dewatering patents
One assignee leads the field with 138 records, well ahead of the fifth-ranked holder at 27. The top five assignees combined hold 288 of the 678 records in scope, 42.5% of the field, which makes this a concentrated rather than fragmented landscape. Companies filing new claims on core dewatering chemistry or mechanical separation should expect to encounter that leader's prior art directly.
Filings peaked at 64 in 2020 and declined across the following complete years to 21 in 2024, a 66% drop from the 2021 level of 62. That said, publication lags filing by roughly 18 months, so the 2025 and 2026 figures in any dataset are understated and should not be read as proof the technology is winding down. A clearer read will only be available once 2025 filings finish publishing.
Water and wastewater treatment (IPC class C02F) appears in 54.9% of the 678 records in scope, and separation processes including filtration (B01D) in 33.9%. Hydrocarbon oils and refining (C10G), wet separation of solids (B03B) and flotation (B03D) each cover a meaningful minority. Solid waste disposal (B09B) and material testing (G01N) are the thinnest classes tracked here, each under 10% of records.
The thinner IPC classes — solid waste disposal and material testing — suggest less claim density than the dominant water-treatment and filtration classes, but that needs confirming with a targeted prior-art search rather than assumed from class counts alone. Sub-areas like real-time solids-content sensing, polymer dosing optimisation and modular or mobile dewatering units look under-claimed relative to the core chemistry and equipment claims. These are reasonable starting points for a freedom-to-operate check before drafting a new application.
Canada leads as a receiving office with 157 filings, followed by the United States at 141 and Australia at 83. WIPO/PCT filings account for 61 and Europe for 52, with South Africa at 35. This spread tracks closely with major oil sands and hard-rock mining jurisdictions, which is consistent with where tailings dewatering technology gets deployed and defended.
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.