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Brine mining

Brine mining is the extraction of valuable minerals and elements from concentrated saline solutions known as brines, which occur naturally in geological formations such as salt flats, geothermal reservoirs, or as byproducts from and oil production processes. This method, a form of solution mining, targets soluble resources like , , magnesium, and by dissolving and recovering them from subsurface deposits or surface pools. Unlike traditional hard-rock mining, brine mining leverages the natural solubility of these minerals in water, making it particularly suitable for arid regions where can concentrate the solutions efficiently. The process typically begins with wells to pump to the surface, followed by concentration through solar in large, shallow ponds that can span kilometers. Over periods of 12 to 24 months, water evaporates under the sun, precipitating less soluble salts first (such as ) while enriching the remaining solution with target minerals like , which reaches concentrations of up to 5,000 . The concentrated is then treated chemically—often with soda ash to form —or via like direct lithium extraction (DLE) using adsorption or to accelerate recovery, reduce times, and minimize environmental impacts; several DLE projects reached commercial scale by 2025. Brine mining supplies approximately 30% of the world's as of 2024, the most economically significant mineral extracted this way, with major deposits in the of South America's region, including Chile's (average lithium concentration of 1,400 mg/L) and Bolivia's , the largest salt flat on . Other notable sites include Clayton Valley in , , and geothermal brines in California's , where operations yield substantial sodium, , and calcium chlorides annually. Rising global demand for in batteries as of 2025 has spurred innovations, including recovery from in oil fields and waste, positioning brine mining as a key contributor to sustainable critical mineral supply chains.

Overview

Definition and Basic Process

Brine mining refers to the extraction of valuable chemical elements or compounds that are naturally dissolved in , defined as a concentrated of salts, typically containing high levels of along with other dissolved minerals. This process targets resources such as , , magnesium, and , which are recovered from natural saline waters rather than solid ores. The basic workflow of brine mining begins with the pumping or collection of from subsurface reservoirs, surface salt lakes, or associated industrial streams. The is then concentrated, often through solar in shallow ponds that allow to evaporate under arid conditions, leaving behind increasingly saturated solutions and initial precipitates of less soluble s. Target minerals are subsequently separated via methods like selective , where chemical agents induce the formation of solid compounds, or through and purification steps. Finally, the isolated minerals undergo further refining—such as or chemical conversion—to yield commercial products like , (), or compounds. Unlike hard-rock mining, which involves energy-intensive crushing and grinding of solid ores to liberate minerals, brine mining leverages the pre-dissolved state of target elements, reducing mechanical processing needs but often requiring extensive land and time for , alongside considerations for water management due to the large volumes of saline fluid handled. Brine mining supplied about 54% of global production in 2024, a critical input for batteries and , as well as nearly all commercial —used in retardants and pharmaceuticals—and a significant share of , essential for fertilizers. A general schematic of the brine mining flow includes:
  1. Extraction: Brine is pumped to the surface.
  2. Concentration: reduces volume and precipitates impurities.
  3. Separation: Target ions are isolated via or adsorption.
  4. Processing: Refined products are dried, crystallized, or converted for market use. This sequence minimizes waste while maximizing recovery efficiency in suitable environments.

Global Importance and Applications

Brine mining serves as a vital source for several critical minerals essential to modern industry and the economy. It supplies nearly all of the world's , which is predominantly extracted from natural brines such as those in the , accounting for approximately 31% of production capacity from that source alone. For magnesium compounds, brine sources contribute significantly, particularly where and natural brines account for the majority of domestic production, though primary magnesium is dominated by ore-based methods in . from brine represents a smaller but strategically important share, with operations at hypersaline lakes providing key supplies amid overall production led by solid deposits. The sector's growing role in lithium extraction underscores its economic importance; according to USGS data, worldwide production reached approximately 240,000 tons in 2024, with brine sources contributing a significant portion. The minerals derived from brine mining find diverse industrial applications, enhancing sectors from to clean energy. Potash, primarily , is a cornerstone of fertilizers, supporting global crop yields and . is widely used in flame retardants for electronics and textiles, as well as in clear brine fluids for oil and gas drilling. Magnesium compounds serve in chemical manufacturing, including the production of soda ash for glass and refractories, while is integral to lithium-ion batteries for electric vehicles and storage. Additionally, brine mining enables the recovery of valuable byproducts from processes, mitigating waste and supporting water-scarce regions by extracting salts like for detergents and production. Globally, brine mining operations are concentrated in regions with abundant bodies, reflecting the distribution of natural brine resources. leads in production from high-altitude salars like , contributing substantially to the country's . In the United States, dominates bromine extraction from subsurface brines, maintaining a leading position in world supply. is a major player in recovery from inland salt lakes, alongside contributions to magnesium and from brines. and jointly operate the Dead Sea, a premier site for and magnesium extraction via solar evaporation, yielding millions of tons annually. In 2024, brine-derived accounted for about 54% of global , with expectations of modest growth amid rising adoption, which accounted for nearly 90% of demand. This expansion highlights brine mining's pivotal role in the , positioning it as a scalable alternative to hard-rock methods amid rising geopolitical pressures on mineral supply chains.

Historical Development

Ancient and Pre-Industrial Extraction

Early human utilization of brines for mineral extraction dates back over 2,500 years, with archaeological evidence from Zhongba in the River basin indicating salt production through brine evaporation as early as the first millennium BCE. Similar solar evaporation methods were used in and from around 3000 BCE to produce from brines. In ancient , brine was extracted from wells and boiled in vessels to produce , a process refined by the around 450 BCE using iron pans for more efficient evaporation. This method relied on or wood fires to heat the , supporting local economies and trade networks across the region. In , Celtic communities in , , exploited deposits from the 8th century BCE through dry mining of veins, yielding up to one of daily through processing, marking one of the earliest large-scale operations in the region. This fueled trade across and contributed to the prosperity of the . Roman expansion later systematized brine evaporation using lead pans heated over fires, as seen in coastal and inland works across the empire, where or spring brines were concentrated and boiled to meet military and civilian demands. Pre-industrial techniques emphasized low-tech, labor-intensive methods, including natural solar in shallow coastal pans where was ponded and concentrated by sun and , a practice widespread in Mediterranean and Atlantic regions from through the . In medieval , from saline springs was boiled in open lead pans over or wood fires, as documented in English and Scottish salt works, producing fine-grained for preservation and . A notable engineering feat was the 1595 wooden from to , —a 40-kilometer network of hollowed trunks that transported concentrated by for at boiling houses, operating continuously until the . Indigenous peoples in the utilized saline lakes for salt recovery prior to European contact, evaporating brines from sources like the through simple solar methods or leaching salty soils, integrating the product into diets and rituals. In regions such as the and , these practices provided essential without advanced tooling. Salt's economic and cultural significance was profound, often termed "" for its value in trade; in medieval , Tuareg-led camel caravans traversed the , exchanging salt slabs from northern mines for gold from southern empires, sustaining trans-Saharan networks from the onward.

Modern Industrial Advancements

The development of solution mining for salt extraction marked a significant advancement in the , transitioning from labor-intensive underground methods to more efficient fluid-based techniques. In , underground salt mining began in the 1860s in western regions, but by the 1880s, solution mining— involving the injection of water to dissolve salt deposits and pump out —had emerged as a scalable alternative, particularly in areas like Syracuse where salt springs were utilized as early as the 1640s, with solution mining industrialized in the post-Civil War era. This method allowed for deeper access to sylvinite and formations without extensive tunneling, boosting production for industrial uses like chemical . Entering the early 20th century, brine mining expanded to extraction, with operations at the Dead Sea commencing in the 1930s using solar evaporation of hypersaline brines to recover . The Potash Company initiated these efforts in 1930, leveraging the Dead Sea's high salinity—up to 34%—to produce for fertilizers, marking one of the first large-scale industrial brine operations in arid regions. By the mid-20th century, recovery from oilfield brines in Arkansas's began in the late 1950s, where companies like pumped bromide-rich brines from depths of 7,000 to 8,000 feet, using oxidation and stripping processes to isolate the element for flame retardants and pharmaceuticals; this site remains the world's largest producer. Concurrently, soda ash production from brines in scaled up in the , building on 1940s discoveries; solution mining dissolved nahcolite- beds in the Green River Formation, yielding over 70% of U.S. soda ash by the 1970s for and industries. The late 20th and early 21st centuries saw a lithium extraction boom in South American salars, with in operational since the 1970s through exploration and process adaptation from U.S. sites like ; commercial production ramped up in the 1980s via evaporation ponds, making it a key supplier of for batteries. This period also introduced direct lithium extraction (DLE) pilots in the , which use selective adsorbents or membranes to recover from brines in hours rather than months, tested in locations like and to reduce water use and environmental impact. Key innovations include the shift from traditional solar evaporation ponds to resins in DLE systems, enabling higher recovery rates (up to 90%) from low-concentration brines without large land footprints. In the 2020s, integration with advanced in California's region, where projects like those by Controlled Thermal Resources extract from hot brines co-produced with power generation, potentially yielding 40% of global supply while enhancing output.

Types of Brine Sources

Seawater and Surface Brines

, with an average of 35 grams of per kilogram (3.5%), serves as a vast and accessible source for mineral extraction. Its composition is dominated by (NaCl), which constitutes about 85% of the dissolved salts, alongside significant concentrations of magnesium (Mg²⁺ at approximately 1,290 mg/L), (K⁺ at 380 mg/L), (SO₄²⁻), and calcium (Ca²⁺). The total volume of Earth's oceans amounts to roughly 1.37 billion cubic kilometers, making the largest on the planet and providing a theoretically inexhaustible supply for mining operations. Seawater brines are particularly suited for extracting magnesium compounds through processes like precipitation with lime followed by electrolysis, as demonstrated in historical industrial methods such as the Dow process developed in the early 20th century. In the United States, seawater and natural brines account for the majority of magnesium compound production, representing about 64% of output in recent years. Globally, while mineral sources dominate primary magnesium metal production, seawater remains a key feedstock for magnesium hydroxide and other compounds due to its consistent ionic profile. Surface brines, formed in coastal solar evaporation ponds where is concentrated through natural solar drying, offer concentrated sources for . These ponds create hypersaline environments ideal for harvesting via sequential . A prominent example is the saltworks in , , the world's largest solar salt operation, with an annual production capacity of about 8 million metric tons of salt from evaporated . The primary advantages of and surface brines lie in their abundance and uniformity, enabling large-scale operations without the variability of terrestrial deposits. However, their relatively low initial concentrations—such as magnesium at 0.13% by weight—necessitate extensive to achieve economic viability, often requiring vast pond areas spanning thousands of hectares. Environmentally, generates hypersaline discharge, which, if not managed, can alter local gradients and affect ecosystems near outfalls.

Inland Saline Lakes and Shallow Groundwaters

Inland saline lakes form primarily in endorheic basins, where inflows accumulate without outflow to the sea, leading to progressive concentration of dissolved minerals through in arid climates. These closed hydrological systems cover about one-tenth of Earth's land surface and result in hypersaline conditions that enhance the economic viability of brine mining for salts and trace elements. Prominent examples include the in , , which exhibits salinity levels ranging from 5% to 27% depending on regional inflows and evaporation rates, serving as a key source of through the harvesting of its surface brines. In , salt lakes within the Qinghai-Tibet Plateau, such as those in the near , are characterized by sodium sulfate subtypes, with Qarhan Salt Lake holding vast reserves of sodium salts exceeding 60 billion tonnes. Another significant site is in , the world's largest salt flat, estimated to contain approximately 21 million metric tons of reserves, the largest known deposit globally. As of 2025, Bolivia's state-owned YLB has progressed with pilot plants and international partnerships, aiming for initial commercial production by year-end. Shallow groundwaters associated with these inland saline lakes often interact with dry lake beds, or , where dissolution of underlying deposits enriches the aquifers with minerals. A representative case is Clayton Valley in , , where lithium-rich brines form through groundwater of beds that were previously concentrated during ancient lake , yielding subsurface fluids suitable for mineral extraction. Brines from these sources typically feature elevated concentrations of , often reaching up to 1,000 ppm in select salars, alongside and , which accumulate due to repeated cycles and minimal dilution. However, these systems face challenges from seasonal variability, as and runoff can temporarily lower and densities, complicating consistent assessment and efforts.

Subsurface Sedimentary and Geothermal Brines

Subsurface sedimentary brines originate from the evaporative concentration of ancient seawater trapped within deep sedimentary basins during geological deposition. These brines form through the progressive evaporation of marine waters in restricted basins, leading to the precipitation of salts and the residual concentration of dissolved ions such as halides, including iodine and bromine. Over time, compaction, tectonic forces, and fluid migration further modify these fluids, resulting in highly saline solutions hosted in porous rock formations at depths often exceeding several thousand feet. Access to sedimentary brines typically involves deep wells into basin formations and pumping the fluids to the surface, a process regulated to ensure through reinjection of spent brines into the originating or similar subsurface formations. In the United States, a prominent example is the in northwestern , where brines at depths of 7,000 to 10,000 feet serve as the primary domestic source of iodine, yielding approximately 3 million pounds annually through extraction from three major operations. These iodine-rich brines result from the interaction of evaporated ancient seawater with organic-rich sediments, concentrating iodine through diagenetic processes. Another key sedimentary brine resource is the in southern , part of the Gulf Coast region, where brines contain concentrations ranging from 4,000 to 4,600 parts per million (ppm). These brines, co-produced with oil and gas operations, account for the majority of U.S. production, with annual volumes of produced waters in the Gulf Coast exceeding billions of barrels, underscoring the scale of this resource. The high content derives from the evaporative origins in marine environments, enhanced by migration into the formation. Reinjection of processed brines is mandatory in oil-producing states to maintain pressure and prevent surface contamination. Geothermal brines, in contrast, arise from the leaching of minerals by hot fluids circulating through volcanic or fractured igneous rocks in tectonically active regions. These brines form when meteoric or connate waters interact with volcanic host rocks under high temperatures, dissolving elements like through hydrothermal processes, often in or extensional settings. The resulting fluids are typically hot (above 150°C) and mineral-rich, emerging from geothermal reservoirs that can be tapped for both and mineral extraction. A notable example is the geothermal field in , where brines contain concentrations up to 400 ppm and are co-produced with geothermal power generation, which utilizes the high-temperature fluids for before mineral recovery. This integrated approach leverages the natural heat of the brines, estimated to hold several million metric tons of in the reservoir, making it a significant resource for critical minerals. Pumping from wells in such fields allows simultaneous energy production and brine processing, with reinjection often required to sustain reservoir viability.

Industrial and Produced Brines

Industrial and produced brines refer to hypersaline waste streams generated as byproducts of various industrial activities, offering opportunities for while posing management challenges due to their high and variable compositions. These brines differ from natural sources by originating from processes, such as and operations, and often contain elevated levels of dissolved salts, metals, and contaminants that can be valorized or require careful handling. Produced waters from and gas represent one of the largest volumes of brines, typically generated at ratios of 3 to 10 barrels of water per barrel of or gas produced in the United States. These waters are co-extracted with hydrocarbons from subsurface reservoirs and can contain significant concentrations of valuable elements, including at median levels around 5 mg/L and rare earth elements that vary by basin but often exceed typical concentrations. Recent 2025 studies emphasize high-potential basins like the , where concentrations can exceed 500 mg/L, supporting emerging direct pilots. For instance, in regions like the , produced waters have been assessed for their content based on annual production volumes exceeding billions of barrels, highlighting their potential as a secondary resource stream. Desalination brines, primarily from processes, constitute another major category, with global production exceeding 140 million cubic meters per day as of 2024—roughly 50% greater in volume than the desalinated freshwater output. These brines, which are about 1.5 times the volume of produced freshwater for typical recovery rates of 40-50%, concentrate salts and trace elements, including at levels up to 2-3 times ambient concentrations, enabling potential recovery through targeted extraction technologies. The Brine Miners project at exemplifies efforts to valorize these wastes by developing electrochemical methods to extract , magnesium, and other metals from effluents, transforming them into marketable products while reducing disposal burdens. Other industrial brines arise from processes like mine treatment and cooling water in , where hypersaline effluents accumulate salts, sulfates, and minerals from or heat exchange systems. For example, in operations, ponds can generate brines rich in recoverable metals through or , while cooling tower blowdown in power plants yields concentrated and calcium salts suitable for reuse in salt production. The primary advantage of recovering resources from these brines lies in converting waste streams into valuable commodities, promoting a and offsetting disposal costs—such as extracting to meet growing demands without additional mining. However, challenges include their inconsistent compositions due to varying source conditions and the presence of contaminants like (e.g., lead, ), which complicate purification and require advanced pretreatment to prevent environmental release during recovery. Brief mention of recovery, such as and rare earths, underscores synergies with broader brine mining applications, though detailed methods are addressed elsewhere.

Extraction Methods

Solar Evaporation Techniques

Solar evaporation techniques represent a longstanding method for concentrating and recovering minerals from sources, particularly in arid environments where high solar radiation and low facilitate natural removal. This process relies on pumping into a network of shallow, sequential ponds, where and evaporate the over extended periods, progressively increasing mineral concentrations and triggering the of salts based on their . Primarily applied to hypersaline brines from saline lakes, the technique has been optimized for extracting high-value elements like while yielding byproducts such as . The core process involves transferring brine through a series of interconnected pond systems, each designed for specific stages of and . Initial ponds promote the removal of calcium and magnesium through the formation of (CaSO₄·2H₂O), which precipitates first due to its low solubility as water volume decreases. Subsequent ponds concentrate () and ( or ), which crystallize and are harvested as the brine density rises. The final stage yields a lithium-enriched solution of (LiCl), typically after 12-18 months of solar-driven , reducing the initial brine volume by over 95% to achieve concentrations from about 0.2% to 6% . This sequential ensures impurities are separated before downstream chemical processing, such as of . Pond design emphasizes maximizing evaporation efficiency while minimizing losses to the subsurface. Facilities use (HDPE) liners, often 0.5-2 mm thick, to create impermeable barriers that retain and protect ; these are overlaid on compacted clay or natural layers for added stability. Ponds are typically shallow, with depths of 0.5-1.5 , to expose a large surface area to —rectangular basins measuring hundreds of in length and width are common, arranged in cascades covering several square kilometers. Operations are confined to hyper-arid climates, such as desert basins with annual rates exceeding 2,000 mm and below 100 mm, ensuring net water loss and preventing dilution. These techniques dominate lithium production from brine in the , , where operations by companies like SQM and Albemarle account for roughly 30-34% of global supply, producing tens of thousands of metric tons of equivalent annually. The method's scalability has also made it central to solar salt extraction at Exportadora de Sal's facility in , , , the world's largest such operation yielding about 9 million metric tons of salt per year through similar pond-based evaporation of . Despite their efficacy, solar evaporation techniques face inherent constraints that limit in water-scarce regions. Large land requirements—often 10-50 km² per major facility—necessitate vast, flat terrains and can disrupt local if not carefully sited. The process incurs substantial water loss, with 95% or more of the input evaporating without recovery, exacerbating demands on already stressed aquifers. Additionally, the extended cycle time of 1-2 years per batch reduces responsiveness to market fluctuations and ties up capital in slow-throughput .

Direct Extraction Technologies

Direct extraction technologies in brine mining encompass advanced methods designed for selective recovery of minerals from brines, bypassing the need for extensive and enabling targeted of valuable elements like , magnesium, and . These approaches leverage chemical, physical, and electrochemical principles to achieve higher efficiency in resource-scarce environments, particularly from subsurface or produced brines. Unlike bulk techniques, direct extraction prioritizes specificity and rapidity, making it suitable for integration with ongoing industrial operations such as production. Ion exchange and adsorption represent cornerstone techniques in direct extraction, utilizing specialized sorbents to selectively capture target ions from s. For instance, spinel-type manganese oxides (LMOs), such as λ-, are widely employed for recovery due to their high selectivity, often exceeding 90% for Li⁺ over competing ions like Na⁺ and K⁺ in complex s. The process involves passing the through fixed-bed columns packed with these sorbents, where ions are adsorbed via ; subsequent with dilute acid (e.g., HCl) releases the concentrated for further processing. Manganese-based sorbents, synthesized through methods like hydrothermal treatment, demonstrate adsorption capacities up to 25-30 mg/g in salt-lake s, with stability over multiple cycles when properly regenerated. These materials are particularly effective in geothermal s, where they enable recovery without disrupting extraction processes. Solvent extraction methods facilitate the isolation of , notably , by converting ions into extractable forms. In this approach, in the is oxidized to elemental (Br₂) using gas, followed by stripping with air or steam to volatilize the Br₂, which is then absorbed into an or alkaline for purification. This achieves high recovery rates, often above 95%, and is scalable for industrial brines from or oilfield operations. like or phases enhance separation efficiency by selectively partitioning Br₂, minimizing co-extraction of other salts. Additional direct extraction modalities include membrane-based filtration and electrochemical processes, broadening applicability to elements like magnesium and . Nanofiltration membranes, often negatively charged composites such as polyetherimide-thin film (PEI-TMC), selectively separate magnesium from in high Mg²⁺/Li⁺ ratio brines, achieving Mg²⁺ rejection rates of 85-95% while permitting Li⁺ passage with recoveries up to 85%. These membranes operate under moderate pressure (5-20 bar), concentrating magnesium in the retentate for downstream recovery. Electrochemical methods, exemplified by Stanford University's 2024 redox-couple system, employ ion-selective sorbents and electrodes to drive migration across membranes, yielding over 90% recovery from brines in hours through spontaneous ion separation powered by concentration gradients. This innovation reduces energy demands compared to traditional , integrating seamlessly with brine flows from geothermal sources. These technologies offer distinct advantages over conventional evaporation, including accelerated processing times—from days or hours versus years—elevated product purity through selective mechanisms, and substantially reduced water consumption, often below 1 m³ per kg of lithium extracted. For example, SLB's direct lithium extraction (DLE) demonstration plant in Clayton Valley, Nevada, with construction initiated in 2023, demonstrated recovery exceeding 90% from brines using advanced DLE technologies, highlighting scalability for arid regions. In 2025, Lilac Solutions completed a pilot on the , , achieving 87% lithium recovery from brines with 69 mg/L using , further validating DLE for low-concentration sources.

Extracted Materials

Sodium and Potassium Salts

Brine mining plays a central role in the production of (NaCl), commonly known as or , which is extracted primarily through solar evaporation of and inland brines. Approximately 75% of global production derives from the evaporation of (40%) and inland brines (35%), with the remainder coming from rock salt mining. Worldwide production reaches about 300 million metric tons annually, making it one of the most abundant minerals obtained from brines. This is widely used in , chemical manufacturing, and de-icing applications, underscoring its foundational role in . Potassium chloride (KCl), or , is another key recovered from sources, particularly through fractional during sequences. The Dead Sea brines in and represent a major global source, contributing significantly to world supply with combined annual production exceeding 5 million metric tons of KCl. In these operations, is pumped into evaporation ponds where sequential precipitation allows for the isolation of KCl after less soluble salts like NaCl crystallize first. Industrial recovery yields from carnallite-rich brines (a of KCl and MgCl₂·6H₂O) typically range from 55% to 74% using direct flotation or methods. is primarily utilized as a to enhance crop yields, supporting global . Soda ash, or (Na₂CO₃), is predominantly extracted from deposits via solution mining of s in the Green River Basin, Wyoming, which supplies over 90% of the ' needs. The process involves injecting hot water into underground beds to dissolve the mineral into , followed by pumping and processing to yield dense soda ash through and crystallization. This region accounts for a substantial portion of global natural soda ash production, emphasizing the efficiency of brine-based extraction over synthetic methods like the . Soda ash serves as a critical feedstock in glass manufacturing, detergents, and . Sodium sulfate (Na₂SO₄), also known as salt cake, is commercially produced from the complex brines of in , where it constitutes about 35% of the lake's mineral resources. Extraction occurs via solar evaporation and fractional crystallization, separating Na₂SO₄ from co-occurring salts like borates and compounds in the alkaline brine. Annual output from this site supports domestic demand, with the compound finding primary applications as a filler in powdered detergents and in the for paper production.

Lithium and Boron Compounds

Brine mining plays a crucial role in the recovery of lithium, a critical mineral essential for lithium-ion batteries used in electric vehicles and renewable energy storage. In saline lake brines, particularly those in salars, lithium concentrations typically range from 100 to 1,000 parts per million (ppm), enabling economically viable extraction through processes that concentrate and purify the element. Direct lithium extraction (DLE) technologies, such as adsorption using aluminum-based sorbents like lithium-selective aluminas, offer an efficient alternative to traditional solar evaporation by selectively capturing lithium ions from brines. These sorbents achieve adsorption capacities of 5-7 grams of lithium per kilogram, allowing for high recovery rates while minimizing water loss and environmental impact compared to evaporation ponds. The extracted lithium is typically recovered as lithium chloride (LiCl) and subsequently converted to lithium carbonate (Li₂CO₃) by reacting with sodium carbonate, yielding battery-grade product with purity exceeding 99.5%, which meets stringent specifications for cathode materials in high-performance batteries. Major global operations for lithium recovery from brines are concentrated in the of , with the in serving as a key site. This salar hosts two primary producers—SQM and Albemarle—whose combined operations yielded approximately 94,000 tons of lithium carbonate equivalent (LCE) in 2023. Projections for global lithium demand by 2030 vary, with estimates ranging from 2.4 to 3.3 million tons LCE depending on scenarios (as of 2024), driven largely by the expansion of production and systems, underscoring the strategic importance of brine-based extraction to meet this growth. Boron compounds, particularly boric acid (H₃BO₃), are another valuable output from brine mining, valued for their applications in manufacturing, ceramics, and . In brines from boron-rich deposits, such as those in Bigadiç, , boron is recovered through solvent extraction processes that utilize diluents like combined with extractants such as isodecanol to form boric acid esters, enabling selective separation from magnesium and other impurities. This method achieves high extraction efficiencies, converting the loaded organic phase back to via stripping with acidified water, producing a purified product suitable for industrial use. 's Eti Maden operates major facilities at Bigadiç, leveraging local brine and mineral resources to dominate global supply. Historically, boron extraction from brines in the United States occurred at , , where natural saline waters were processed via solar evaporation to yield borates alongside soda ash and other salts during the early . Today, approximately 50% of global consumption is directed toward , where enhances thermal resistance, chemical durability, and clarity in borosilicate glasses used for , containers, and . While geothermal brines also contain , their recovery is often integrated into broader subsurface extraction efforts.

Halogen Elements

Bromine is primarily extracted from subsurface brines in the of southern , which supplies all domestic production and represents a major global source. The brines in this formation contain bromine concentrations ranging from 4,000 to 4,600 parts per million (), far exceeding typical levels of about 65 . Global bromine production reached approximately 430,000 metric tons in 2023, with the contributing 210,000 metric tons through these brine operations. The standard extraction process, known as the , involves oxidizing bromide ions in the brine with gas to liberate elemental (Br₂), followed by air or stripping to volatilize the bromine vapor, and subsequent absorption into a solution or direct distillation for purification. A key application of extracted is in the production of brominated flame retardants, which enhance in plastics, textiles, and electronics. Iodine extraction from brines occurs mainly in oilfield settings, with prominent operations in Japan and the Anadarko Basin of Oklahoma. In Japan, iodine is recovered from natural gas-associated brines, where concentrations typically range from 20 to 50 ppm; the country produced about 9,000 metric tons in 2023, accounting for roughly 30% of global output from an estimated 30,000 metric tons excluding the United States. Japanese methods include the blowing-out process, which oxidizes iodide to iodine with chlorine gas and strips it using air, as well as ion-exchange techniques using silver-loaded resins for selective adsorption. In the Anadarko Basin, brines from Pennsylvanian sandstones contain iodine at concentrations of 100 to 1,560 ppm, often averaging around 200 ppm in productive zones; extraction here utilizes the blowout process, involving oxidation with chlorine and air stripping in towers to recover iodine, a method originally developed to handle well blowouts during early operations. These regional examples highlight brine mining's role in supplying iodine for applications in pharmaceuticals, disinfectants, and nutritional supplements. Extraction of both elements faces challenges due to their low concentrations in many brines, typically 50 to 500 for iodine, requiring large volumes of fluid processing and efficient technologies to achieve economic viability. For bromine, the use of as an oxidant introduces separation issues, as co-produced and residual must be managed through and scrubbing to isolate pure Br₂.

Magnesium and Heavy Metals

Magnesium is a key material recovered from brines, particularly and subsurface brines, through established industrial processes. The , developed in the early 20th century, involves precipitating (Mg(OH)₂) from using (calcium hydroxide), followed by dissolving the precipitate in to produce (MgCl₂), which is then electrolyzed to yield metallic magnesium and gas. This method has been pivotal for large-scale production, with facilities like the original Dow plant in , extracting magnesium from starting in the 1940s. Globally, primary magnesium production reached approximately 1.05 million metric tons in 2022, with a significant portion derived from and sources, primarily in and the . Magnesium extracted via these processes is widely used in lightweight alloys for aerospace applications, such as aircraft structures and engine components, due to its high strength-to-weight ratio. Heavy metals like are recovered from geothermal brines using selective extraction techniques. In California's , hypersaline geothermal brines from power plants contain elevated concentrations, enabling recovery through solvent extraction processes where the brine is mixed with an immiscible that selectively binds complexes. This method, operational since the 1980s at facilities like those operated by CalEnergy, processes post-flash to precipitate and refine , contributing to the local economy while utilizing waste streams from production. Such recoveries highlight the potential of geothermal brines as secondary resources for base metals, with output supporting galvanizing and industries. Uranium extraction from brines in Wyoming employs in-situ recovery (ISR), a leaching method where alkaline or acidic solutions are injected into sandstone-hosted ore bodies to solubilize , forming a pregnant brine that is pumped to the surface for processing. These roll-front deposits typically contain concentrations around 500 parts per million, making ISR economically viable for low-grade resources. has been a major producer, accounting for most U.S. output via ISR since the 1950s, though recovery efforts declined sharply after the 1980s peak of 43.7 million pounds of U₃O₈ annually due to falling market prices and reduced nuclear demand. Production has seen a resurgence in recent years, with accounting for nearly all US output of about 200,000 pounds U₃O₈ in 2023. The extracted is processed into (U₃O₈) for fabrication, underscoring ISR's role in minimizing surface disturbance compared to conventional . Emerging direct extraction technologies, such as ion-exchange resins, offer improved selectivity for magnesium and from complex brines, potentially enhancing recovery efficiency in geothermal and sedimentary sources.

Environmental and Social Impacts

Hydrological and Ecosystem Effects

Brine mining, particularly through evaporation techniques, requires substantial , exacerbating in arid environments where most operations occur. ponds, which concentrate lithium-rich brines, typically involve total water evaporation of approximately 500-2,000 cubic meters of brine per ton of equivalent (LCE), with freshwater use varying from 15-50 m³/ton LCE depending on site conditions and technology. This process draws from already limited aquifers, leading to significant drawdown; in Chile's , for instance, excessive brine pumping has caused land at rates of 1 to 2 centimeters per year, altering the flat's structure and permeability irreversibly. Such hydrological disruptions contribute to salar by lowering water tables and increasing phreatic , which depletes subsurface reserves and affects regional hydrodynamics. As of 2024, reports indicate approximately 65% of available water in the is consumed by mining activities, predominantly in regions already facing high water stress. These water-intensive practices have profound ecosystem consequences, particularly in fragile high-altitude and habitats. In the Andean , lithium brine extraction has led to a 90% reduction in vegetated areas near sites, degrading habitats critical for endemic species and accelerating processes. Flamingo populations, such as James's and Andean flamingos in the , have declined by 10% and 12%, respectively, due to reduced surface availability from depletion, which disrupts breeding and foraging grounds. Hypersaline discharges from operations, when released into surrounding bodies, further harm ecosystems by increasing levels, which stress benthic organisms and reduce in wetlands and rivers. Geothermal brine mining introduces additional hydrological alterations through reinjection of spent brines, which can change subsurface pressure and flow dynamics. Reinjection helps maintain reservoir pressure but risks inducing by increasing pore pressure along faults, as observed in fields like the where extraction and reinjection correlate with elevated rates. These changes can propagate to surface , potentially contaminating shallow aquifers or altering patterns in seismically active regions. Recent analyses underscore the broader vulnerability of brine mining sites. In China's near , potash extraction from brines has hindered ecosystem preservation by diverting water flows and salinizing habitats, contributing to overall biodiversity degradation in alpine wetlands.

Social Impacts

Brine mining operations have significant social repercussions, particularly for indigenous and local communities in mining regions. In the , extraction has led to water shortages that affect traditional agriculture, livestock, and daily needs, exacerbating poverty and sparking conflicts. For example, the Lickanantay people in Chile's report reduced access to , impacting their cultural practices and health, with some communities facing increased respiratory issues from dust and contamination. In and , similar projects have displaced pastoralists and led to protests over lack of consultation, highlighting tensions between global green energy demands and local rights. Economic benefits like jobs are often limited, with most high-skilled positions held by outsiders, fostering dependency rather than .

Mitigation Strategies and Regulations

Mitigation strategies for brine mining focus on minimizing consumption, waste generation, and ecological disruption through technological and operational innovations. Zero-liquid discharge (ZLD) systems are widely adopted to recycle process and eliminate discharge, as implemented at the Thacker Pass lithium project in , where ZLD maximizes reuse during and processing. Direct lithium (DLE) technologies further reduce environmental footprints by avoiding large ponds, achieving 30-80% less use compared to traditional methods, while enabling higher recovery rates. Brine reinjection, which returns depleted brines to subsurface , is a key practice to preserve hydrological balance; in the , projects like Eramet's Ageli geothermal initiative in mandate reinjection to maintain integrity and comply with environmental directives. Regulatory frameworks enforce these strategies to ensure sustainable operations. In , the 2023 National Lithium Strategy limits extractions in sensitive salars by prioritizing low-impact DLE technologies and requiring environmental impact assessments to curb water overuse in arid regions like the Atacama. In the United States, the () issues permits for lithium projects, such as Thacker Pass, mandating comprehensive monitoring of levels, brine chemistry, and to mitigate hydrological risks. Innovative remediation approaches address contamination from brine operations. Phytoremediation uses hyperaccumulator plants to extract and associated metals from contaminated soils at sites, offering a low-cost, eco-friendly method to restore affected areas without chemical interventions. Community agreements in incorporate veto , allowing local groups to halt projects on the if they infringe on cultural or environmental protections, as upheld in legal challenges against foreign-backed extractions. International standards and policies promote responsible practices globally. The Initiative for Responsible Mining Assurance (IRMA) provides a certification framework tailored to brine extraction, emphasizing waste minimization, , and biodiversity protection; Albemarle's operation became the first site to achieve IRMA compliance in 2023. The European Union's 2024 incentivizes low-impact brine technologies like DLE for domestic production, aiming to meet 10% of demand through sustainable sourcing by 2030 while streamlining permits for environmentally vetted projects.

Economic Aspects and Future Outlook

Production Economics and Markets

Brine mining operations, particularly for , exhibit varying production costs depending on the method employed. Traditional techniques, widely used in South American salars, incur operating expenses ranging from $4,000 to $6,000 per metric ton of equivalent (LCE), driven by land requirements, water usage, and extended processing times of 12-18 months. In contrast, direct lithium extraction (DLE) technologies offer costs as low as $2,000 to $4,000 per metric ton of LCE for advanced methods, benefiting from lower capital expenditures due to reduced infrastructure needs, though offset by higher operating expenses from chemical reagents and energy-intensive adsorption processes. Market dynamics for brine-derived minerals remain volatile, especially for , which traded at approximately $10,000–$12,000 per metric ton of LCE as of November 2025, a sharp decline from the 2022 peak exceeding $80,000 amid oversupply and moderated growth. markets, however, demonstrate stability at around $3,000 per metric ton, supported by consistent in retardants and oilfield chemicals. The global brine mining sector generates an annual value of about $20 billion, encompassing , , and production, with profitability enhanced in integrated operations. International trade underscores supply chain concentrations, with controlling roughly 60% of global chemical processing capacity, enabling it to refine brine-extracted concentrates into battery-grade products despite producing only a fraction of raw . In the United States, reliance on imports reaches 90%, primarily from Canadian sources, exposing the sector to geopolitical risks and pressures. A notable example of economic viability is extraction from the in , where co-production with leverages existing infrastructure to minimize incremental costs.

Technological Innovations and Challenges

Recent advancements in direct lithium extraction (DLE) technologies have focused on enhancing efficiency and sustainability, particularly through AI optimization and electrochemical innovations. In 2024, researchers at Telescope Innovations developed an AI-guided process using their ReCRFT technology to optimize the production of battery-grade from brines, improving efficiency and reducing environmental impact by dynamically adjusting parameters. Similarly, introduced a redox-couple (RCE) method that achieves up to 88.9% faradaic efficiency and 99.5% selectivity at an ultralow operating voltage of 0.25 V, enabling continuous with energy consumption as low as 1.1 kWh per kg of —significantly lower than traditional methods. Multi-metal recovery from desalination brines represents another key innovation, addressing while valorizing byproducts. The Brine Miners project at employs electrically charged membranes and zero-liquid-discharge processes powered by renewables to extract , magnesium, and other metals from desalination effluents, potentially unlocking 15.8 million kg of annually from global brine volumes while producing clean water and . This approach targets the 86,000 million cubic meters of brine generated yearly from seawater desalination, transforming it into a resource for critical materials. Integration with offers a pathway to co-produce and renewable power, minimizing environmental footprints. At the , Controlled Thermal Resources' Hell's Kitchen project combines DLE with geothermal operations to target 25,000 metric tons of per year in its initial stage, supported by a 49.9 MW plant, with full-scale development aiming for operations by 2027; as of 2025, the project has advanced through permitting but remains pre-operational. Despite these advances, scaling DLE faces technical hurdles, especially in low-lithium brines below 100 , where selectivity and recovery efficiency drop due to competing ions like sodium and magnesium, limiting commercial viability without further and adsorbent improvements. Geopolitical risks also pose challenges, as seen in Bolivia's state-controlled salars, where policies and historical resource sovereignty measures have delayed foreign investments and stalled development of the world's largest reserves. Global investments in DLE include a targeted $5 billion fund for critical minerals through U.S.-led initiatives with partners like Resource Partners to bolster supply chains. If these technologies mature, DLE could expand supply by several fold, potentially meeting up to 10 times the current production levels needed by 2030 to support demand.

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