# Salt: Extraction

Four ways to win salt from rock, brine and sea

Source page: https://www.materialinsights.org/commodities/salt/extraction/

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.

Salt comes from four routes. Rock salt is mined underground from ancient evaporite beds and domes. Solution mining pumps water into salt beds and returns brine, which feeds chemical plants directly. Solar salt is evaporated from seawater or saline lakes in sunny climates. Vacuum-pan salt is brine boiled in vessels to a pure product. In the United States, brine made up 44% of salt sold in 2025, rock salt 38%, and solar and vacuum-pan salt 9% each.

Salt is the most widely produced mineral: almost every country has deposits or evaporation sites. There are four routes. Solar evaporation of seawater or lake brine is cheapest where sun, wind and flat coastal land meet, as in Gujarat's Little Rann of Kutch. Underground mining of rock salt supplies road salt in North America and Europe. Solution mining pumps water into salt beds and sends brine straight to chemical plants. Vacuum-pan evaporation boils purified brine into fine, pure food and pharmaceutical salt.

#### Methods compared

| Method | Share of supply | Typical scale | Recovery / efficiency | By-products | Unit cost |
|---|---|---|---|---|---|
| **Solar evaporation (sea and lake brine)** | about 80% of India's output (IBM 2022); solar salt was 9% of US salt sold (USGS 2026) | Archean Chemical sold 3.48 Mt of industrial salt in FY2025 from its Rann of Kutch brine operation (Archean annual report FY2025) | n/a | Bromine, magnesium salts, sulphate of potash from bitterns | US solar salt f.o.b. unit value about $150/t in 2025 (price, not cost; USGS); India's 2021-22 exports averaged about Rs 1,511/t (derived from IBM export value and volume) |
| **Underground rock-salt mining** | 38% of US salt sold in 2025 (USGS) | n/a | n/a | n/a | US rock salt f.o.b. unit value about $54/t in 2025 (price, not cost; USGS) |
| **Solution mining (brine wells)** | salt in brine was 44% of US salt sold in 2025 (USGS) | n/a | n/a | Storage caverns | US salt in brine unit value about $11/t in 2025 (price, not cost; USGS) |
| **Vacuum-pan evaporation (refined salt)** | 9% of US salt sold in 2025 (USGS); India produced 5.5 Mt of refined salt in 2021-22 (IBM) | Tata Chemicals commissioned 70 kt of pharma-grade salt capacity at Middlewich, UK, in FY2025 (Tata Chemicals) | n/a | n/a | US vacuum and open-pan salt unit value about $260/t in 2025 (price, not cost; USGS) |

#### How each method works
**Solar evaporation (sea and lake brine)**

Seawater or subsoil brine is led through a series of shallow condenser and crystalliser pans. Sun and wind concentrate it until sodium chloride crystallises, leaving bitterns rich in bromine, magnesium and potassium. Salt is harvested by hand or machine, stacked and washed. Gujarat's coastal and Rann of Kutch salt works are the world's best-known example.

Lowest energy cost; depends on monsoon and weather, labour-intensive in India, and needs large land areas.
 IBM Indian Minerals Yearbook 2022; USGS MCS 2026; Archean annual report FY2025 **Underground rock-salt mining**

Room-and-pillar mines with drilling and blasting or continuous miners work thick evaporite beds and domes hundreds of metres down. Rock is crushed and screened, often with an anti-caking agent, and sold mostly as road salt.

Large, weather-independent output near winter markets; mine flooding and seasonal demand swings.
 USGS MCS 2026 **Solution mining (brine wells)**

Water is injected into salt beds through wells and saturated brine is pumped out, then piped to chlor-alkali or soda ash plants or to vacuum-pan refineries. The caverns left behind can store gas, oil or helium.

Cheapest feed for chemical plants; subsidence and brine disposal risks.
 USGS MCS 2026 **Vacuum-pan evaporation (refined salt)**

Purified brine is boiled under vacuum in multiple-effect evaporators to produce fine, uniform, high-purity crystals for food, pharma and specialty uses. It is energy-intensive but gives the highest-value product.

High purity and margins; high energy use.
 USGS MCS 2026; IBM 2022; Tata Chemicals FY2025 results 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 |
|---|---|---|---|---|---|
| **China National Salt Industry Group (and other Chinese producers)** National output; company volume not published in sources reviewed. | China | sea, lake and well salt; chemical salt | 56,000 kt (China national output) | 2025 | [USGS MCS 2026](https://www.usgs.gov/centers/national-minerals-information-center/salt-statistics-and-information) |
| **K+S** Salt volume not found in sources reviewed. | Germany | rock salt mining and evaporated salt in Europe | not published | 2025 | Company reports; Germany output 15,000 kt in 2025 (USGS) |
| **Compass Minerals** Volume not found in sources reviewed. | US | rock salt mining and road salt (North America) | not published | 2025 | Company reports |
| **Cargill Salt** Private company; volume not published. | US | rock salt, solar and vacuum salt | not published | 2025 | Morgan, Merchants of Grain (Belle Isle mine history) |
| **Exportadora de Sal (ESSA), Guerrero Negro** National output shown; company volume not published in sources reviewed. | Mexico | solar salt for export to the US and Asia | 7,000 kt (Mexico national output) | 2025 | [USGS MCS 2026 (Mexico 26% of 2021-24 US salt imports)](https://www.usgs.gov/centers/national-minerals-information-center/salt-statistics-and-information) |

#### Who does it: India

| Company | Country | Activity | Volume | Year | Source |
|---|---|---|---|---|---|
| **Archean Chemical Industries** 77% of revenue from exports; East Asia the core salt market. | India | industrial salt from Rann of Kutch subsoil brine; exports via Jakhau | 3.48 Mt industrial salt sold | FY2025 | [Archean Chemical annual report FY2025 (NSE filing, May 2025)](https://nsearchives.nseindia.com/corporate/ARCHEAN_11052025235726_AnnualReportIntimation.pdf) |
| **Tata Chemicals** Salt volume not published in the results release. | India | salt works at Mithapur; Tata Salt brand; captive salt for soda ash | not published | FY2025 | [Tata Chemicals FY2025 results](https://www.tataworld.com/news/openinside/tata-chemicals-q4-and-fy25-results) |
| **Hindustan Salts / Sambhar Salts** Plans for 1 Mt/yr raw salt capacity. | India | state-owned; lake salt at Sambhar (Rajasthan), rock salt at Mandi (Himachal) | 0.2 Mt raw salt a year (Sambhar) | 2021-22 | [IBM Indian Minerals Yearbook 2022, Salt](https://ibm.gov.in/writereaddata/files/17125772176613dac1f2662Salt_2022.pdf) |

India is the third-largest producer (30 Mt in 2025, after China and the US; USGS) and became the largest exporter by volume in 2024 (17.3 Mt, about 29% of world seaborne salt trade; BRS). Gujarat produced about 85% of India's salt in 2021-22 (IBM), and 97% of output is private. Salt is not on any critical minerals list.

## Other sections

- [Summary](https://www.materialinsights.org/commodities/salt/index.md)
- [Overview](https://www.materialinsights.org/commodities/salt/overview/index.md)
- [Correlation](https://www.materialinsights.org/commodities/salt/correlation/index.md)
- [Production](https://www.materialinsights.org/commodities/salt/production/index.md)
- [Stocks](https://www.materialinsights.org/commodities/salt/stocks/index.md)
- [Cycles](https://www.materialinsights.org/commodities/salt/cycles/index.md)
- [Trading](https://www.materialinsights.org/commodities/salt/trading/index.md)
- [Movement](https://www.materialinsights.org/commodities/salt/movement/index.md)
- [Criticality](https://www.materialinsights.org/commodities/salt/criticality/index.md)
- [Characteristics](https://www.materialinsights.org/commodities/salt/characteristics/index.md)
- [Emissions](https://www.materialinsights.org/commodities/salt/emissions/index.md)
- [Relationships](https://www.materialinsights.org/commodities/salt/links/index.md)