Other Nonmetallic Mineral Mining & Quarrying (U.S.)

An investor's primer — NAICS 2022 code 21239

Written for a general investing audience — both public-market investors (listed producers, diversified miners, sector funds) and private investors (private/PE-owned operators, and mineral- and royalty-rights owners). Business counts, payroll, and concentration are from the U.S. Census Bureau; physical production, prices, and reserves are from the U.S. Geological Survey (USGS). This is a rollup page: NAICS 21239 is a five-digit "industry" that contains only one six-digit child, 212390, so the two are effectively the same thing. Read this for the group-level facts, then go to the 212390 primer for the full detail.

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1. Overview

NAICS 2022 code 21239 — Other Nonmetallic Mineral Mining and Quarrying — is the U.S. government's catch-all bucket for mining the chemical and fertilizer minerals that are neither coal, metal ore, stone, sand, gravel, nor clay [1]. In plain terms, it is where you find the mines that dig up phosphate rock, potash, soda ash (from trona ore), rock and brine salt, borates, and brine lithium — the raw inputs behind fertilizer, glass, industrial chemicals, road de-icing, and batteries.

It is a small, capital-heavy industry: about 236 establishments and 10,238 workers producing roughly $5.77 billion of shipments a year [2][3]. Those figures understate its importance — these minerals feed multi-billion-dollar downstream fertilizer, chemical, and battery businesses, and several sit on the U.S. "critical minerals" list.

Why an investor cares. This is a commodity extraction business, not a utility or a landlord. Owners are price-takers: no U.S. producer sets the world price of phosphate, potash, lithium, or soda ash, so margins are the thin, swinging residual between a globally-set price and a largely fixed cost base. Returns are, at bottom, a leveraged bet on commodity prices — dampened only by owning the lowest-cost, longest-life reserves (or the royalties on them).

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2. What's inside — and why the group equals its one child

NAICS is a nested code system: each five-digit "industry" splits into one or more six-digit "national industries." Code 21239 has exactly one child — 212390, of the same name — so there is nothing to aggregate. Every establishment, dollar, and tonne counted at 21239 is 212390; the group is a pass-through, and the same federal statistics describe both levels [1].

Inside that single child sit several separate commodity markets that share a NAICS bucket but not much else:

The code covers only the mine-and-beneficiation slice (mining plus physical prep — crushing, washing, screening, concentrating). The far larger downstream steps — a phosphate miner's fertilizer plant, lithium chemical conversion — sit in other NAICS codes (325 manufacturing) [1]. That is why company results and the official "21239" figure never match: the biggest dollars at Mosaic or Nutrien are in the manufacturing links, not the mining link. For everything else — commodity-by-commodity detail, the full company table, deeper regulation and risk — see the 212390 primer.

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3. How big it is

Because 21239 equals 212390, the group's own ground-truth stats are the child's:

That works out to only ~43 workers per establishment but an average wage above $100,000 — the signature of a tiny-headcount, high-capital, continuous-process industry. Honesty flag: the Census imputed a large share of the 2022 revenue and payroll totals, so treat them as the best official estimate rather than an audited sum [2].

The physical minerals (USGS). USGS commodity values measure the whole commodity chain — partly in downstream codes and in more recent years — so they run larger than, and cannot be added to, the Census business figure. At the commodity level, salt is the largest by tonnage and jobs (~40 million tonnes, ~$2.5B, ~4,000 workers); soda ash sits on the world's largest trona deposit (Wyoming's Green River Basin) and is a net exporter; phosphate rock is ~$2B and ~13–16% import-reliant; potash is the most import-dependent (~92%); lithium is the smallest workforce (~70) but the highest-optionality commodity [5]–[9]. The 212390 primer breaks these out with reserves and import-reliance for each.

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4. The investable universe

Public exposure runs through a short list of producers, all highly levered to commodity prices, and none is a clean proxy for the code — each blends downstream processing and non-U.S. mines. (Tickers and market caps belong to the how-to-invest section, not the group definition.)

• Diversified fertilizer names — Nutrien (NTR; world's largest potash producer, mostly Canada) and Mosaic (MOS; largest U.S. phosphate miner) are the large-cap proxies [13][14].
• Near-pure U.S. play — Intrepid Potash (IPI) is the closest thing to a clean 21239 stock (New Mexico/Utah potash plus Trio® and Permian produced-water royalties) [16].
• Salt — Compass Minerals (CMP; rock salt + sulfate-of-potash) [15].
• Lithium / boron via majors — Albemarle (ALB; Silver Peak, NV, the only commercial U.S. lithium-brine operation) and Rio Tinto (RIO; U.S. Borax) [9][17][18], plus development-stage lithium (Lithium Americas, Ioneer) for project optionality [20].

Much of the code is not investable through equities at all. The two biggest commodities — salt and soda ash — are dominated by private, PE-owned, and foreign hands: Cargill and PE-owned Morton Salt in salt [25]; WE Soda (Turkey's Ciner group) and Sisecam in Wyoming soda ash [24]; and J.R. Simplot (private) in phosphate [27]. Because so much output comes from federal leasable ground, the U.S. Treasury is effectively a royalty owner (see §7); listed royalty/streaming vehicles for these industrial minerals remain far rarer than in precious metals [26]. The full company-by-company table lives in the 212390 primer.

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5. How the money works

These are price-takers in a commodity business. Revenue is payable volume × realized price; cash flow is that minus mining, processing, freight, royalties, and tax. The core levers (each detailed in the 212390 primer):

• Commodity price dominates. Revenue tracks price, not volume — Mosaic's net sales nearly halved from 2022 to 2024 on roughly flat volumes [13]. High fixed costs pass price swings disproportionately into cash flow.
• Reserves and reserve life. Value rests on tonnes in the ground; a reserve is the economically mineable part at today's prices — a price drop can shrink reserves even though the rock is still there [5]–[8].
• Cost curve. Low-cost natural producers (Wyoming trona, Florida phosphate) sit at the left of the global cost curve and stay cash-positive through downturns; high-cost swing producers shut when prices fall. Metal-style AISC (all-in sustaining cost) thinking applies to phosphate and potash; salt is a freight-limited, local-pricing business where location is the moat [7].
• Depletion & royalties. The tax code's percentage-depletion allowance shelters cash flow; owning the mineral or royalty interest is a lower-risk, no-capex way to ride commodity prices [5]–[11].

Where the children diverge: 21239 has only one child, so there is no cross-child divergence at this level — the within-code divergence is by commodity (fertilizer minerals vs. de-icing salt vs. battery lithium), covered in full in the 212390 primer.

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6. What drives demand

• Agriculture (phosphate, potash) — the master cycle; long-run demand follows population and crop-nutrient replacement (no substitute for phosphorus or potassium as plant nutrients), near-run demand swings with crop prices and dealer de-stocking [5][6].
• De-icing (salt) — ~37–41% of salt goes to highway de-icing; a mild winter directly dents salt-miner revenue [7].
• Glass, chemicals, construction (soda ash, salt, boron) — track GDP, construction, and auto production [8][10].
• Electrification (lithium, phosphate, boron) — batteries are ~88% of lithium use, and lithium-iron-phosphate (LFP) batteries open a new phosphate demand channel — the highest-growth, highest-volatility vector [5][9].

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7. Regulation

The defining legal split is leasable vs. locatable. The Mineral Leasing Act of 1920 made phosphate, potassium, sodium (salt/soda ash/trona), and sulfur leasable: on federal land the operator gets a Bureau of Land Management (BLM) lease and pays rent plus a production royalty [21]. Hard-rock minerals including most lithium remain "locatable" under the General Mining Law of 1872 — claimed, not leased, and historically royalty-free [25]. Federal royalty minimums are ~5% for phosphate/sulfur and 2% for sodium and potassium [22]. All operations are federally inspected Metal/Nonmetal mines under the Mine Safety and Health Administration (MSHA) [23]. Environmental permitting is the binding constraint, especially for phosphate — phosphogypsum stacks are an open-ended, long-tailed liability [27]. Full detail is in the 212390 primer.

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8. Consolidation

At the aggregate code level the industry looks unconcentrated — the top four firms hold 44.9% of revenue, the top eight 65.9%, and the Herfindahl-Hirschman Index (HHI, a standard concentration gauge) is just 674, well below the ~1,500 "concentrated" line [2]. But that average is misleading: it blends separate commodity markets that are each tight oligopolies (five phosphate firms, a handful of potash producers, five soda-ash firms, three boron firms). Consolidation is the dominant trend, increasingly into foreign and PE hands — soda ash under WE Soda/Ciner and Sisecam, salt under Stone Canyon/Morton, Cargill, and Compass [24][25].

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9. Risks

1. Commodity-price cyclicality — the central risk. Every producer's revenue and margin swing violently with globally-set prices (Mosaic's ~40% revenue drop 2022→2024; lithium's ~80%+ price collapse). Peak distributions are not annuities [13][9][14].
2. Cost inflation / margin squeeze. Energy, freight, sulfur, and ammonia can move opposite to the selling price [5][11].
3. Permitting & environmental liability. Florida wetlands permits, Wyoming trona reviews, and phosphogypsum obligations can defer capacity for years and outlast mine life [27].
4. Depletion & import dependence. U.S. potash is ~92% import-reliant; Florida phosphate faces declining grade — supply-security and geopolitical risk [5][6].
5. Weather. Mild winters (salt) and hurricanes (Florida phosphate) hit volumes directly [7].
6. Energy-transition risk — but note the asymmetry. Unlike coal, most of this code is not a stranded-asset loser: fertilizer minerals stay essential and lithium/boron benefit from electrification. Lithium's risk is oversupply, not obsolescence [9][11].

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10. How to invest & outlook

Public routes. Producer equities — diversified fertilizer names (NTR, MOS), the salt/SOP name (CMP), the near-pure U.S. potash small-cap (IPI), lithium/boron via majors (ALB, RIO), and development-stage lithium (LAC, IONR). All are cyclical — weigh balance-sheet resilience and mid-cycle free cash flow, not peak earnings. There is no pure "21239" fund; investors approximate via agribusiness/fertilizer funds (MOO, VEGI), lithium/battery baskets (LIT), or broad materials/mining funds (XLB, XME) — diversified but diluted [26].

Private routes. Direct or PE ownership of operating mines (the main way to reach salt and soda ash), development projects (large upside, stacked geological/permitting/financing risk), and mineral & royalty interests (a price-linked, no-capex income stream — diligence the royalty base, title, and water rights). Size leverage to trough cash flow, not a base-case price deck.

Near-term outlook (judgments, not facts). The code bifurcates into a stable, low-growth industrial base (salt, soda ash) and a higher-growth, higher-volatility frontier (phosphate/LFP, potash, lithium, boron). Ownership will keep consolidating into foreign and PE hands. Across every route, the durable edge is the same: own the best reserves at the bottom of the cost curve — or the royalties on them — because in a price-taker business, cost position and reserve life are the only things anyone actually controls.

For the complete treatment — commodity-by-commodity economics, the full investable-universe table, detailed regulation, and the reliability notes — read the [212390 primer], which this page summarizes.

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Sources

1. U.S. Census Bureau, "2022 NAICS Definition: 212390 — Other Nonmetallic Mineral Mining and Quarrying," 2022. https://www.census.gov/naics/?details=212390&year=2022
2. U.S. Census Bureau, 2022 Economic Census — summary statistics and concentration measures for NAICS 212390 (156 firms; $5.770B receipts; CR4 44.9%, CR8 65.9%, CR20 85.1%, CR50 96%; HHI 674.4), released 2024. https://data.census.gov/table/ECNBASIC2022.EC2200BASIC
3. U.S. Census Bureau, County Business Patterns 2023 (NAICS 2022 basis: 236 establishments; 10,238 employees; $1,049.1M annual payroll), 2025. https://www.census.gov/programs-surveys/cbp.html
4. U.S. Geological Survey, Mineral Commodity Summaries — Phosphate Rock (2025–2026 editions, data years 2024–2025). https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-phosphate.pdf
5. U.S. Geological Survey, Mineral Commodity Summaries — Potash. https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-potash.pdf
6. U.S. Geological Survey, Mineral Commodity Summaries — Salt. https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-salt.pdf
7. U.S. Geological Survey, Mineral Commodity Summaries — Soda Ash. https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-soda-ash.pdf
8. U.S. Geological Survey, Mineral Commodity Summaries — Lithium. https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-lithium.pdf
9. U.S. Geological Survey, Mineral Commodity Summaries — Boron. https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-boron.pdf
10. U.S. Geological Survey, Mineral Commodity Summaries — Sulfur. https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-sulfur.pdf
11. The Mosaic Company, Form 10-K (total net sales $19.13B 2022 → $11.12B 2024). https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0001285785&type=10-K
12. Nutrien Ltd., Annual Report / results releases (total sales ~$26B 2024; potash EBITDA sensitivity ~$280M per $25/t). https://www.nutrien.com/investors
13. Compass Minerals International, Form 10-K (revenue ~$1.1B; Salt ~83%). https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0001227654&type=10-K
14. Intrepid Potash, Inc., Form 10-K (total sales ~$255M 2024; potash/Trio/Permian produced-water royalties). https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0001421461&type=10-K
15. Albemarle Corporation, Form 10-K & "Silver Peak, NV" (only commercial U.S. lithium-brine operation). https://www.albemarle.com/us/en/silver-peak
16. Rio Tinto, "California Operations — U.S. Borax." https://www.riotinto.com/operations/us/california-operations
17. Lithium Americas Corp., Form 10-K (Thacker Pass, NV, development project). https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0001966983&type=10-K
18. U.S. Bureau of Land Management, "Nonenergy Leasable Minerals" (Mineral Leasing Act of 1920). https://www.blm.gov/programs/energy-and-minerals/mining-and-minerals/nonenergy-leasable-materials
19. Electronic Code of Federal Regulations, 43 CFR §3504.21, "Minimum Production Royalties" (phosphate 5%, sodium 2%, potassium 2%, sulfur 5%). https://www.law.cornell.edu/cfr/text/43/3504.21
20. U.S. Mine Safety and Health Administration & Bureau of Labor Statistics, mine-safety and injury-rate tables (2024). https://www.msha.gov/data-and-reports/statistics
21. WE Soda, "Acquisition of Genesis Alkali" (~$1.425B, 2025); Sisecam Green River trona ownership. https://www.wesoda.com/news-resources/information-library/acquisition-of-genesis-alkali-creating-the-worlds-leading-soda-ash-producer/
22. U.S. Department of Justice, "Stone Canyon Required to Divest US Salt to Acquire Morton Salt" (K+S sold Morton for $3.2B, 2021). https://www.justice.gov/archives/opa/pr/stone-canyon-required-divest-us-salt-acquire-morton-salt
23. Sweetwater Royalties, "Company and Asset Overview" (~4.5M mineral acres, Green River Basin). https://www.sweetwaterroyalties.com/
24. U.S. EPA, "Phosphogypsum" (Florida phosphogypsum >1B tons; 2021 Piney Point discharge). https://www.epa.gov/radiation/phosphogypsum
25. Congressional Research Service, "Mining on Federal Lands: Hardrock Minerals" (General Mining Law of 1872; locatable minerals incl. lithium), 2024. https://www.congress.gov/crs-product/R48166
26. VanEck Agribusiness (MOO); iShares MSCI Agriculture Producers (VEGI); Global X Lithium & Battery Tech (LIT); Materials Select (XLB) / SPDR Metals & Mining (XME). https://www.vaneck.com/us/en/investments/agribusiness-etf-moo/
27. J.R. Simplot Company, "Mining & Manufacturing" (privately held; Idaho–Utah phosphate). https://www.simplot.com/mining-and-manufacturing

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Reliability notes. NAICS 21239 is a single-child five-digit industry identical to 212390; all figures shown here are that one child's. Business counts, payroll, and concentration are U.S. Census Bureau — firms, receipts, and concentration from the 2022 Economic Census [2]; establishments, employment, and payroll from County Business Patterns 2023 [3]; the two programs differ in year, coverage, and imputation, so their headcounts don't match exactly, and Census imputed a large share of 2022 revenue/payroll. Physical production, prices, and reserves are USGS Mineral Commodity Summaries (2024–2025 data), several figures withheld or estimated [5]–[11]; USGS commodity values measure broader mineral chains and cannot be added to the Census business total. Company figures are from SEC filings and results releases [13]–[20]. For the full commodity detail and company table, see the 212390 primer.