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). NAICS 21239 is a five-digit industry with one six-digit child, 212390, so the two levels are effectively the same.

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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.

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, including a phosphate miner's fertilizer plant and 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.

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3. How big it is

Because 21239 equals 212390, the group's 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].

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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.

• 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].

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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].

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).

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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].

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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.

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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.