Sand & gravel: Extraction
Why rivers and glaciers are the world's sand factories
Why rivers and glaciers are the world's sand factories What this tab covers How it is mined, drilled or grown, and processed into a tradeable form: the main methods compared, their unit economics, by-products, and the companies that do this work globally and in India.Construction sand and gravel are loose grains of rock sorted by water or ice. The main commercial sources are glacial deposits, river channels and floodplains. In some countries, offshore banks are dredged for building projects, while the US mostly reserves them for beach replenishment. Extraction is simple. Pits are dug with loaders or dredges, and the material is washed and screened into sizes. Tilton describes sand and gravel as relatively uncomplicated to produce. Grain shape matters: wind-rounded desert sand binds poorly in concrete. Conway notes that desert Dubai still imports sand from Belgium, the Netherlands and the UK.
Construction sand and gravel is dug, not mined in the hard-rock sense. The main routes are dry pits in glacial and alluvial deposits, wet pits and river dredging, and marine dredging of offshore banks. A fast-growing fourth route, important in India, is manufactured sand (M-sand) made by crushing rock or processing mine overburden. Washing and screening turn raw material into graded products. Because the material is cheap and heavy, transport cost decides where supply comes from, and permits decide which deposits can be worked.
Methods compared
| Method | Share of supply | Typical scale | Recovery / efficiency | By-products | Unit cost |
|---|---|---|---|---|---|
| Dry pits in glacial and alluvial deposits | Main US route; Texas, California and Arizona lead output (USGS) | US average about 0.13 Mt per pit a year (870 Mt from 6,500 pits, 2025, derived) | n/a | Silt and clay fines | US average sale value $14.50/t at the pit (2025, USGS) |
| River and wet-pit dredging | Major source in India and much of Asia; share not published | From small boats to large dredgers | n/a | n/a | Not available from the sources used |
| Marine dredging | Important in the UK, Netherlands, Belgium, Singapore region; share not published | Singapore says it imported about 600 Mt in 2000-2020 while exporters reported 280 Mt (Conway 2023) | n/a | Shell | Not available from the sources used |
| Manufactured sand (M-sand) from crushed rock and overburden | About 50% of sand used in concrete in India (Indian Cement Review, 2021 interview) | Indian crusher plants 25,000-40,000 t a month (Indian Cement Review, 2021); Coal India planned 2.9 million m3 a year from about 6 million m3 of overburden | About 0.5 m3 of sand per m3 of overburden at WCL (203,000 m3 from 400,000 m3, derived) | Coarse aggregate; fines | WCL earned Rs 11.74 crore from 203,000 m3, about Rs 578/m3 (derived) |
How each method works
Dry pits in glacial and alluvial depositsTopsoil is stripped, and loaders dig sand and gravel above the water table. Mobile or fixed plants wash and screen it. Land is restored as farmland, lakes or housing after extraction.
Simple and cheap; zoning near cities pushes new pits further out (USGS).
USGS MCS 2026 River and wet-pit dredgingSuction or bucket dredges lift sand from riverbeds, lakes and flooded pits. Uncontrolled river mining in Asia lowers riverbeds, damages bridges and ecosystems, and is widely illegal (Conway 2023).
Clean, well-graded sand; serious environmental damage and illegal mining (CAG found revenue losses over Rs 500 crore in Rajasthan in 2017-2020).
Conway (2023); IMPRI citing CAG (2021) Marine dredgingTrailing suction hopper dredgers mine offshore sand banks for construction and land reclamation. The US uses offshore deposits mostly for beach replenishment; other countries mine them routinely for building (USGS).
Large volumes near coastal cities; salt must be washed out for concrete.
USGS MCS 2026; Conway (2023) Manufactured sand (M-sand) from crushed rock and overburdenRock is crushed in vertical shaft impactors and screened or washed to sand grading. India pushes M-sand to protect rivers: Rajasthan's M-Sand Policy 2024 targets about 30 Mt a year by 2028-29 and requires 25-50% M-sand in public works. Coal India processes overburden into sand.
Consistent grading and no river damage; angular grains need more cement paste unless shaped.
IMPRI (2025); Indian Cement Review (2021); PIB / Ministry of Coal (2023) Unit economics are indicative ranges from the sources named; costs vary widely by deposit, region and year.Who does it: global
| Company | Country | Activity | Volume | Year | Source |
|---|---|---|---|---|---|
| Vulcan Materials | US | aggregates (crushed stone, sand and gravel) | 227 million short tons of aggregates shipped | 2025 | Pit & Quarry (Apr 2026) citing company results; Vulcan 2025 10-K (425 active facilities, 16.6 billion tons of reserves) |
| Martin Marietta Materials Full-year tonnage not available from the sources used; Q4 2025 shipments were 48.9 million tons at $23.11/t. | US | aggregates; acquired Lhoist North America in 2026 | not published | 2025 | Pit & Quarry (Apr 2026) |
| CRH Tonnage not available from the sources used; 2025 revenue $37.4 billion. | Ireland/US | aggregates, asphalt and cement; acquired Arcosa in 2026 | not published | 2025 | Rock Products (2026) |
| Heidelberg Materials Tonnage not available from the sources used; 2025 revenue EUR 21.5 billion. | Germany | aggregates, cement and ready-mix | not published | 2025 | Global Cement (2026) |
| Holcim Tonnage not in the results release. | Switzerland | aggregates and cement (North America spun off as Amrize in 2025) | not published | 2025 | Holcim 2025 results release |
Who does it: India
| Company | Country | Activity | Volume | Year | Source |
|---|---|---|---|---|---|
| Coal India (WCL and other subsidiaries) | India | M-sand from mine overburden | 2.9 million m3 sand a year planned from nine plants (4,250 m3/day existing, 5,500 m3/day proposed) | 2023 plan | PIB / Ministry of Coal (Jan 2023) |
India has no national production figure for sand. Supply comes from riverbeds licensed by states, M-sand crushers and coal overburden. Rules include the Sustainable Sand Mining Management Guidelines 2016 (MoEFCC) and the Ministry of Mines Sand Mining Framework 2018, which promotes M-sand and imports. States such as Karnataka and Rajasthan have M-sand policies.