Other Crushed and Broken Stone Mining and Quarrying (NAICS 212319)

An investor primer for a general audience — public-market and private investors alike. NAICS (North American Industry Classification System) 2022 code 212319, United States.

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1. Overview

Crushed stone is the unglamorous foundation of everything that gets built: every mile of road, runway, rail bed, foundation, and pipe trench rests on angular rock that was blasted, crushed, and screened at a quarry. NAICS 212319 covers the slice of that business that mines stone other than ordinary limestone and granite — chiefly traprock (basalt, diabase, gabbro), sandstone and quartzite, marble, slate, and volcanic rock. It is a narrow, precisely defined niche within a much larger construction-aggregates industry.[1]

Why an investor should care. Crushed stone as a whole is the most valuable non-fuel mineral commodity mined in the United States — roughly 1.5 billion metric tons worth about $26 billion in 2024, or about a quarter of all U.S. non-fuel mineral production value.[7] The economics are unusual and, for the right asset, very attractive: a ton of rock is worth only ~$15–$22 at the quarry gate, but trucking it is so expensive that it cannot travel far. That turns each permitted quarry into a local near-monopoly with durable pricing power — an infrastructure franchise sitting on a depleting mineral reserve.[12][26]

Two ways in:

• Public markets — a handful of large listed producers (Vulcan Materials, Martin Marietta, and diversified groups like CRH and Amrize). Note up front: no listed company is a pure play on 212319 — they all blend "other" stone with the much larger limestone, granite, and sand-and-gravel businesses.
• Private markets — the long tail of ~275 firms in this code (and ~1,400 across all crushed stone) is mostly family- and private-equity-owned. The lowest-effort private entry is owning aggregate-bearing land and leasing it for a per-ton royalty.

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2. What it is, and what it is not

In scope (NAICS 212319): establishments that develop a mine site and quarry, crush, or beneficiate (grind/pulverize) stone other than limestone and granite — traprock, sandstone, quartzite, marble, slate, serpentine, volcanic rock, and miscellaneous stone — plus, by explicit exception, bituminous limestone and bituminous sandstone.[1] "Mining" here includes the crushing and screening customarily done at the quarry; it is not just the act of pulling rock from the ground.

Out of scope — the adjacent codes matter, because they hold most of the value:

So 212319 is the "everything else" bucket of crushed stone: roughly 15–16% of national crushed-stone tonnage.[9] Its flagship product is traprock — hard, angular, abrasion-resistant stone prized for road base, high-friction highway surfaces, and railroad ballast — concentrated in the Northeast/Mid-Atlantic and Pacific Northwest.

Ownership mix. The sector is a barbell: a few large consolidators (mostly public or foreign-owned) at the top, and a long tail of small, private, family-owned quarries below. Federal data do not break the ownership split (public vs. family vs. private-equity vs. foreign vs. royalty) out at the six-digit level — that is a genuine data gap.

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3. How big it is

Our ground-truth federal statistics for NAICS 212319

These are the authoritative, code-specific U.S. Census figures for this exact industry.

Concentration — this is a nationally fragmented industry: the Herfindahl-Hirschman Index (HHI, the standard antitrust concentration measure; below 1,500 is "unconcentrated") is just 285, and the four largest firms hold only 25.3% of revenue.[3]

Source: 2022 Economic Census concentration table.[3]

Two honesty caveats. First, the Economic Census 212319 row carried heavy imputation (Census flags roughly 40–50% of revenue and 30–40% of payroll/employment as estimated), so treat the dollar-level precision as an official estimate, not audited accounts.[2] Second, because NAICS classifies establishments by their primary product, some "other crushed stone" is made at plants counted under other codes — the Census product table found 505 establishments producing ~$3.18 billion of 212319-type products, versus 434 in the industry itself, i.e. a modest undercount at the establishment level.[5]

Physical production, in real units (USGS — all crushed stone, broader than 212319)

The U.S. Geological Survey (USGS) reports by rock type, not by NAICS code, and its totals include limestone and granite (which are outside 212319). Kept separate and clearly labeled:

• 2024: ~1.5 billion metric tons of crushed stone, worth ~$26 billion, from ~1,400 companies operating ~3,500 quarries across all 50 states; average value ~$17.50/ton.[7]
• 2025 (estimate): ~1.5 billion tons, ~$27 billion, ~$18/ton.[8]
• Rock mix (2024): ~70% limestone/dolomite, ~14–15% granite, ~6% traprock, ~5–6% miscellaneous, ~3% sandstone/quartzite, ~1% other.[9]
• End uses: ~72% construction aggregate (mostly roads), ~17% cement, ~6% lime, ~1% agriculture.[8]

A rough, unofficial bridge: the non-limestone, non-granite categories (the 212319 "family") are ~15–16% of 1.5 billion tons, or about 225–240 million tons — which reconciles reasonably with the ~$3.2 billion Census revenue figure, but is only an order-of-magnitude estimate. USGS does not publish a NAICS-212319 tonnage.[9]

Safety/labor context. Every quarry is regulated as a surface mine. MSHA's (Mine Safety and Health Administration) broad Stone category — wider than 212319 — logged about 72,500 employees, 147 million work-hours, six fatalities, and ~1,306 reportable injuries in 2024.[10] Aggregates jobs are blue-collar, geographically dispersed, and relatively well-paid for their rural markets.[11]

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4. The investable universe

There is no pure-play 212319 stock; every listed producer blends "other" stone with limestone, granite, and sand-and-gravel. Company figures below are therefore whole-company, not code-specific. Market capitalizations move daily and are not in our source set, so scale is shown as 2025 aggregates volume and reserves — the metrics that actually drive these businesses.

Major private / foreign owners: Quikrete (private; bought Summit Materials, below), Rogers Group (largest privately held U.S. aggregates producer — 13 states, 3,500+ employees), plus Luck Stone, New Enterprise Stone & Lime, NEBCO, H&K Group, and hundreds of single-state operators. Foreign ownership of U.S. capacity is heavy (CRH, Amrize, Heidelberg, Cemex).

Leverage to price. These are commodity producers: earnings swing with the construction cycle. But the swing shows up more in volume than in price (Section 5), which is why the pure-plays have compounded through downturns. Summit Materials (formerly NYSE: SUM) illustrates the endgame — Quikrete took it private in February 2025 for ~$11.5 billion enterprise value ($52.50/share).[18]

What's missing versus oil, gas, and metals: there is no dedicated aggregates ETF (exchange-traded fund) and no listed aggregates royalty or streaming company — the private-royalty market has no public equivalent.

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5. How the money works

Aggregates are a commodity business — but a peculiar one. Unlike oil (priced globally off benchmarks such as WTI, West Texas Intermediate, tracked by the U.S. Energy Information Administration) or metals (priced on exchanges), crushed stone has no national price. Its economics run on a different master variable.

(a) Freight-limited local pricing — the whole game. Transportation is roughly 50–70% of the delivered cost of aggregate, and Vulcan states outright that delivery can cost more than the rock itself; about 80% of shipments move by truck straight from quarry to job.[12][26] A heavy, low-value product cannot absorb a long haul, so a quarry's economic market is typically a ~25–50 mile radius — beyond it, a closer competitor wins on delivered price. The result: each quarry is a local quasi-monopoly, and pricing power is structural, not cyclical. This is why listed producers have pushed through mid-to-high-single-digit price increases annually, even in down-volume years.

The practical formula:

Delivered price = quarry-gate (FOB) price + freight & handling

FOB (free on board) is the price at the quarry gate, before trucking. Because freight is a pass-through, investors should focus on freight-adjusted revenue: Vulcan's 2025 aggregates segment booked $6.30 billion of sales but only $4.99 billion freight-adjusted — the mine-gate business is what matters.[12]

(b) Unit economics. Quarry-gate prices ran about $22–$23/ton in 2025. Vulcan realized a freight-adjusted average selling price (ASP) of $21.98/ton with GAAP gross profit of $8.66/ton (and a company-defined cash gross profit of $11.33/ton); Martin Marietta shipped at $23.30/ton for $8.45/ton gross profit.[12][13] Incremental tons are highly profitable once the plant is built, so price gains fall almost straight to margin. (Eagle Materials, at a $14.23/ton net price and thin segment earnings, shows why you must look below the ticker — its value is cement and gypsum, not stone.)[17]

(c) Reserves and reserve life — the moat. The scarce asset is a permitted deposit near a growing market. Stone is geologically abundant; permitted, specification-grade stone within hauling distance of demand is not. USGS declines to publish a national reserve number, but the majors disclose enormous lives: Vulcan 16.6 billion tons (~73 years), Martin Marietta ~16 billion tons (~85 years), CRH ~18.3 billion tons (~88 years).[9][12][13][14] New-quarry permitting can take 5–10+ years, so incumbents' entitled reserves are effectively irreplaceable — the durable competitive advantage. (Caveat: a company can have 80 years nationally yet be short in one profitable metro market; site-level reserve life is what counts.)

(d) Capital intensity and depletion. Quarries are expensive to build (land, crushers, wash plants, haul fleets) but have very long lives and low obsolescence. Vulcan spent $703 million on property/plant/equipment in 2025; Martin Marietta spent $807 million.[12][13] Depletion is booked per ton mined; sustaining capital is modest once mature, so established quarries throw off strong free cash flow. Watch for underinvestment — deferred stripping or equipment replacement can temporarily flatter cash flow.

(e) Royalties and mineral rights. Operators either own the land or lease the reserve, paying the landowner a royalty — a fixed sum per ton or a percentage of sales, usually with minimum annual payments. Vulcan owns ~63% of its reserves and leases ~37%, paying $128.6 million of mineral royalties in 2025 (an implied ~$0.57/ton company-wide); Martin Marietta paid ~$104 million (~$0.52/ton).[12][13] Per-ton rates vary widely by geology and market. For a private investor, owning the land and collecting the royalty is the lowest-operational-risk exposure — inflation-linked income tied to local construction, without running the mine.

(f) Price-taker versus price-maker — the nuance. Classic extractive industries are pure price-takers whose margins are set by a global commodity price they can't influence — oil & gas producers (E&P, exploration & production) live and die on lifting cost, finding-&-development (F&D) cost, and netbacks; metal miners on all-in sustaining cost (AISC) and ore grade. Aggregates are the exception: pricing is local and administered, so producers have real pricing power, and demand is anchored by non-discretionary infrastructure maintenance. The cyclicality is genuine, but it lands on volume and fixed-cost absorption, not on a collapsing headline price.

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6. What drives demand

• Public infrastructure (the anchor). Roads, bridges, and streets are the largest single market; ~72% of crushed stone goes to construction aggregate, mostly roads.[8] Vulcan says publicly funded work is historically 40–55% of its shipments.[12] The Infrastructure Investment and Jobs Act (IIJA, 2021) put ~$350 billion into federal highways through fiscal 2026 — a multi-year tailwind now in peak spend-out.[27] The offset: highway construction-cost inflation (a record ~26% in 2022) has eroded the real purchasing power of that money.[28]
• Private nonresidential construction. Warehouses, data centers, semiconductor and manufacturing plants (the reshoring wave), power and grid build-out. USGS's 2026 outlook specifically flags manufacturing, energy facilities, and data centers as supportive.[8]
• Residential construction. Housing starts drive concrete and asphalt aggregate; rate-sensitive and the main swing factor in the 2023–2025 soft patch.
• Cement and lime feedstock (~17% + 6%) — mostly limestone, so more a 212312 story.[8]
• Railroad ballast — a signature traprock (212319) market: hard, angular stone for track beds.
• Agriculture — aglime and soil conditioning (~1%).[8]
• Substitution/recycling. Recycled concrete and asphalt can replace virgin aggregate in some uses — small nationally, but competitive in dense urban markets where haul distances are long.[8]

Long-run demand tracks population growth plus infrastructure replacement — GDP-plus, low-volatility volume growth — but the investable question is always local: does this producer own permitted reserves inside the growth corridor's haul radius?

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7. Regulation

• Federal land / leasing. Most aggregate is mined on private or state land, so the General Mining Law of 1872 is largely peripheral. Congress removed "common varieties" of sand, stone, and gravel from that law in 1955; on federal land the Bureau of Land Management (BLM) now sells them as "saleable minerals" at fair-market value under the Materials Act, with environmental review under NEPA (the National Environmental Policy Act).[24] Bottom line: unlike gold, copper, or lithium, 212319 carries little federal hard-rock royalty exposure.
• Safety — MSHA. Every quarry is a federally regulated mine (Mine Act): mandatory inspections (surface mines at least twice a year), blasting and highwall rules, and a major focus on respirable crystalline silica and diesel/dust.[10]
• Environment — EPA and states. The Environmental Protection Agency's (EPA) effluent guidelines at 40 CFR Part 436 explicitly cover crushed-stone operations, governing mine drainage and stormwater through the NPDES (National Pollutant Discharge Elimination System) permit program.[25] Add Clean Water Act (CWA) §404 wetlands permits, Clean Air Act (CAA) dust controls, and state reclamation bonds.
• State/local — the binding constraint. Zoning, conditional-use approval, blasting hours, truck routes, setbacks, and reclamation are decided locally, and local "not-in-my-backyard" opposition routinely delays or blocks new quarries for years. This is simultaneously the sector's biggest supply risk and its deepest moat.
• Taxes. Severance, sales, and property taxes vary by state and are generally modest versus oil/gas/coal severance regimes.
• ESG. Direct-emissions intensity is low relative to cement; scrutiny centers on dust, silica, noise, blasting, water, truck traffic, and land reclamation. Decarbonization pressure falls mainly on the cement side of integrated producers.

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8. Competitive dynamics and consolidation

Locally concentrated, nationally fragmented. Nationally the industry is unconcentrated (HHI 285; CR4 25.3%),[3] and Vulcan estimates the ten largest producers hold only ~35% of all U.S. aggregates.[12] But local markets are tight — freight defines narrow geographies, and a metro may have only two or three viable suppliers. The Department of Justice (DOJ) treats coarse aggregate as a local antitrust market: it forced Vulcan to divest 17 facilities in its 2017 Aggregates USA deal.[23]

Consolidation is the dominant secular theme. Because permitted reserves near growth are scarce and slow to create, buying reserves is faster than building them, and M&A is the primary growth engine. Recent deals:

• Quikrete / Summit Materials — ~$11.5 billion enterprise value, closed February 2025 (public-to-private).[18]
• Martin Marietta / Blue Water Industries — $2.05 billion for 20 Southeast operations (~13 Mt/yr, ~800 Mt reserves), 2024 — an ~$2.56/reserve-ton benchmark, though location and permits drove the price.[19]
• Martin Marietta / Quikrete asset exchange — closed February 2026; MLM took ~20 Mt/yr of aggregates plus $450 million cash, traded away cement/ready-mix assets.[20]
• CRH / Arcosa — $8.5 billion, announced June 2026, pending.[21]
• Martin Marietta / Lhoist North America — $13.5 billion (mostly limestone/lime, adjacent), announced June 2026, pending.[22]

Basis of competition: reserve location and quality, permitting position, distribution (rail/barge/terminal access), local market density, and vertical integration into asphalt/ready-mix — not low-cost global-commodity pricing. High and rising barriers to entry underpin the sector's premium valuations.

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9. Risks

1. Volume and local-price cyclicality (the central risk). Demand tracks construction — highways, housing, nonresidential — which is rate-sensitive and cyclical. The relevant "price" is a portfolio of local realized prices, not a national index, and a downturn hits hardest through lower shipments and poor fixed-cost absorption rather than falling published prices.
2. Cost inflation. Diesel, electricity, explosives, steel wear parts, tires, and labor can outrun price increases; success depends on contract timing and local competitive intensity.
3. Permitting / zoning delay. A resource is worthless without approvals; conditions (setbacks, depth limits, hour caps) can shrink usable reserves. A supply risk that doubles as a moat.
4. Depletion / reserve quality. Headline reserve life can mask short life in a key metro, distant or low-grade rock, or high lease royalties.
5. Capital intensity. Greenfields and distribution terminals can burn cash for years before reaching volume; deferred maintenance can flatter near-term free cash flow.
6. Acquisition and leverage risk. The best permitted portfolios command high prices; overpayment, debt-funded deals, and integration missteps can destroy otherwise strong site economics. Pending mega-deals materially change public-company leverage and mix.
7. Infrastructure-policy risk. Public funding is a stabilizer but adds legislative risk; the fiscal-2026 expiration of current federal highway authorization makes reauthorization a real variable.[8][27]
8. Energy-transition / stranded-asset risk — LOW (a relative strength). Unlike coal and oil, aggregates face little decarbonization demand destruction: roads, concrete, grids, and renewables all need stone regardless of the energy mix. The only carbon exposure is indirect (diesel, freight) and, for integrated producers, cement.

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10. How to invest, and the outlook

Public-market routes

• Aggregates pure-plays: Vulcan (VMC) and Martin Marietta (MLM) — the cleanest exposure to the reserve-moat, local-pricing model. Historically premium-multiple compounders. (Martin Marietta's pending Lhoist deal would add lime/minerals.)[12][13]
• Diversified building materials: CRH (CRH) and Amrize (AMRZ) embed large U.S. aggregates inside foreign-domiciled global groups; Eagle Materials (EXP) is principally cement/gypsum; Knife River (KNF) adds contracting.[14][15][16][17]
• ETFs (indirect only): there is no pure-play aggregates fund. The Materials Select Sector SPDR (XLB) held VMC and MLM at ~4.7% and ~4.6% (July 2026); Global X U.S. Infrastructure Development (PAVE) held each at ~2% — both diluted by unrelated names. Check weights at the date of investment.[29][30]
• The dividend/buyback pattern: unlike oil and metals producers — whose payouts swing boom-to-bust with the commodity price — aggregate leaders run steadier capital returns. Vulcan returned ~$260 million in dividends plus ~$438 million in buybacks in 2025; Martin Marietta returned ~$647 million.[12][13] A severe volume downturn or a leveraged acquisition can still restrain returns, but the pattern is more sustainable than in classic extraction. Normalize valuation (EV/EBITDA — enterprise value to earnings before interest, taxes, depreciation and amortization) across a full construction cycle.

Private-market routes

• Direct / private-equity (PE) ownership of quarries and regional roll-ups — the long tail of ~275 firms in this code (and ~1,400 across crushed stone) is mostly private; a durable, cash-generative, inflation-linked local franchise, but operationally intensive (permitting, safety, capital).
• Mineral & royalty / land interests — owning aggregate-bearing land and leasing it for a per-ton or percent-of-sales royalty is the lowest-operational-risk private play. Diligence is everything: title and access, permit transferability, product-quality testing, minimum payments, audit rights, and protection against operator underinvestment or affiliate transfer-pricing.
• What's absent versus oil & gas: no liquid market for aggregate mineral rights, no securitized royalty interests, no streaming companies — so private exposure is illiquid and locally negotiated.

Outlook (forward-looking judgment)

The medium-term setup is constructive but locally uneven. Public infrastructure (near its IIJA peak through fiscal 2026), manufacturing reshoring, power projects, and data-center construction should support volumes, while permitting constraints keep supply tight — a favorable price backdrop.[8] The bull case is pricing durability: structural reserve scarcity plus freight-protected local competition should sustain mid-single-digit-plus annual price gains even in soft-volume years. Consolidation continues, keeping deal multiples elevated. The bear case is a construction recession, delayed highway reauthorization, higher-for-longer rates, or cost inflation that outruns price — worst for leveraged consolidators and marginal greenfields.

Watch: the next federal surface-transportation bill, mortgage rates, diesel prices, freight-adjusted price per ton, market-specific (not just national) reserve life, and acquisition multiples. The enduring truth, and the reason the best assets are so valuable:

The U.S. will not run out of stone. It can run short of permitted, specification-grade stone within economical hauling distance of demand — and that scarce, local, depleting franchise is what an aggregates investment really owns.

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Sources

1. U.S. Census Bureau, 2022 NAICS — 212319 and Stone Mining & Quarrying definitions (scope, exclusions, adjacent codes), 2022. https://www.census.gov/naics/?details=212319&year=2022
2. U.S. Census Bureau, 2022 Economic Census — EC2200BASIC, NAICS 212319 (275 firms; $3.246 billion revenue; imputation flags), released 2024. https://data.census.gov/table/ECNBASIC2022.EC2200BASIC
3. U.S. Census Bureau, 2022 Economic Census — Concentration ratios, NAICS 212319 (HHI 285; CR4 25.3%, CR8 42.9%, CR20 61.0%, CR50 80.2%). https://data.census.gov/table/ECNSIZECONCEN2022
4. U.S. Census Bureau, County Business Patterns 2023 — NAICS 212319 (434 establishments; 7,059 employees; $606.2M annual payroll; $141.0M Q1 payroll). https://www.census.gov/programs-surveys/cbp.html
5. U.S. Census Bureau, 2022 Economic Census — Products by Industry (EC2200NAPCSPRDIND) (505 establishments; ~$3.179B "other crushed stone" product shipments). https://data.census.gov/table/ECNNAPCSPRD2022.EC2200NAPCSPRDIND
6. U.S. Small Business Administration, Table of Small Business Size Standards / 13 CFR 121.201 (NAICS 212319 = 550 employees, effective 2023). https://www.sba.gov/document/support-table-size-standards
7. U.S. Geological Survey, Mineral Commodity Summaries 2025 — Stone (Crushed) (2024: ~1.5 Bt, ~$26B, ~1,400 companies / 3,500 quarries; leading non-fuel commodity). https://pubs.usgs.gov/periodicals/mcs2025/mcs2025-stone-crushed.pdf
8. U.S. Geological Survey, Mineral Commodity Summaries 2026 — Stone (Crushed) (2025 estimate ~1.5 Bt, ~$27B; end-use split; 2026 demand outlook). https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-stone-crushed.pdf
9. U.S. Geological Survey, Mineral Commodity Summaries 2023–2024 — Stone (Crushed) (rock-type shares: ~70% limestone/dolomite, ~14–15% granite, ~6% traprock, ~3% sandstone/quartzite, ~1% other; unit values). https://pubs.usgs.gov/periodicals/mcs2024/mcs2024-stone-crushed.pdf
10. Mine Safety and Health Administration, Metal/Nonmetal — Stone category, 2024 Final (~72,500 employees; 147.1M hours; 6 fatalities; ~1,306 reportable occurrences). https://arlweb.msha.gov/STATS/PART50/WQ/2024/table2.pdf
11. U.S. Bureau of Labor Statistics, OES / QCEW — NAICS 212 & 212300 (mining employment and wages). https://www.bls.gov/oes/2023/may/naics4_212300.htm
12. Vulcan Materials Company, 2025 Form 10-K (226.8 Mt shipped; freight-adjusted ASP $21.98/ton; GAAP gross profit $8.66/ton; 16.6 Bt reserves; 63% owned/37% leased; $128.6M royalties; $703M capex; ~10% U.S. share; capital returns). https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=1396009&type=10-K
13. Martin Marietta Materials, 2025 Form 10-K (198.5 Mt shipped at $23.30/ton; agg revenue $5.004B; gross profit $8.45/ton; ~16 Bt crushed-stone reserves; $104M royalties; $807M capex; ~$647M capital returns). https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=916076&type=10-K
14. CRH plc, 2025 Form 10-K (736 U.S. pits/quarries; ~18.3 Bt U.S. reserves ~88 yr). https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=849395&type=10-K
15. Amrize Ltd., 2025 Form 10-K (376 N. American pits/quarries; 118.9 Mt sold; 2025 Holcim spin-off). https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=2035989&type=10-K
16. Knife River Corporation, 2025 Annual Report (~1.3 Bt reserves; vertically integrated). https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=1955520&type=10-K
17. Eagle Materials Inc., Fiscal 2026 Form 10-K (6.567 Mt aggregates at $14.23/ton; Concrete & Aggregates segment $283.3M revenue; 205.7 Mt reserves; cement/gypsum-led). https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=918646&type=10-K
18. Summit Materials / Quikrete, Completion of Merger (~$11.5B enterprise value; $52.50/share; SUM delisted, closed Feb 2025). https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=1621563&type=8-K
19. Martin Marietta Materials, Blue Water Industries Southeast Acquisition ($2.05B; ~20 operations; ~13 Mt/yr; ~800 Mt reserves), 2024. https://ir.martinmarietta.com
20. Martin Marietta Materials, Completion of Asset Exchange with Quikrete (~20 Mt/yr aggregates + $450M cash; closed Feb 2026). https://www.sec.gov
21. CRH plc, CRH to Acquire Arcosa for $8.5 Billion (announced June 2026; pending). https://www.crh.com
22. Martin Marietta Materials, Combination with Lhoist North America ($13.5B; announced June 2026; pending). https://ir.martinmarietta.com
23. U.S. Department of Justice, Vulcan / Aggregates USA — Required Divestiture of 17 Facilities, 2017. https://www.justice.gov/opa/pr/justice-department-requires-vulcan-divest-17-aggregate-facilities-order-acquire-aggregates
24. U.S. Bureau of Land Management, Saleable Minerals: Sand, Stone and Gravel (Materials Act; common varieties removed from 1872 Mining Law in 1955). https://www.blm.gov/programs/energy-and-minerals/mining-and-materials/saleable-minerals
25. U.S. Environmental Protection Agency, Mineral Mining and Processing Effluent Guidelines — 40 CFR Part 436 (covers crushed-stone/NAICS 212319; NPDES). https://www.epa.gov/eg/mineral-mining-and-processing-effluent-guidelines
26. National Stone, Sand & Gravel Association / industry data — transportation ~50–70% of delivered aggregate cost; ~$1–2/ton-mile freight beyond base radius. https://www.nssga.org/who-we-are/our-economic-impact
27. Congressional Research Service, R47573 — Funding and Financing Highways under IIJA (~$350B federal highway funding, FY2022–2026). https://www.congress.gov/crs-product/R47573
28. U.S. Bureau of Transportation Statistics, Increases in Highway Construction Costs Could Reduce IIJA Funding (highway cost inflation ~26% in 2022). https://www.bts.gov/data-spotlight/increases-highway-construction-costs-could-reduce-iija-funding-allocated
29. State Street Global Advisors, Materials Select Sector SPDR ETF (XLB) — Holdings (VMC ~4.7%, MLM ~4.6%, July 2026). https://www.ssga.com/us/en/intermediary/etfs/state-street-materials-select-sector-spdr-etf-xlb
30. Global X, U.S. Infrastructure Development ETF (PAVE) — Holdings (VMC/MLM ~2% each, July 2026). https://www.globalxetfs.com/funds/pave