Florida’s mining industry is built around phosphate rock, limestone, heavy mineral sands, specialty clays, and peat. Phosphate is the state’s signature mineral resource, but Florida is also one of the top producers of crushed stone in the country and supplies several niche minerals with global industrial applications.
Phosphate Rock
Phosphate is Florida’s most economically significant mined resource. The region known as Bone Valley, in central Florida, is considered one of the most accessible phosphate deposits in the world and accounts for more than 60% of all U.S. phosphate production. Mining began there in the 1880s and continues today on a massive scale.
Most of the phosphate pulled from Florida’s ground goes into fertilizer manufacturing for global food production. It also ends up in animal feed supplements, food preservatives, and a range of industrial products. If you’ve ever used a bag of lawn fertilizer or eaten food grown with commercial fertilizers, there’s a good chance Florida phosphate played a role.
Phosphate mining produces a byproduct called phosphogypsum, a mildly radioactive waste material that gets stacked in enormous mounds near processing plants. These “gypsum stacks” are regulated under strict state rules that govern their design, location, groundwater monitoring, and distance from drinking water wells and floodplains. Managing these stacks is one of the biggest ongoing environmental challenges tied to Florida mining.
Limestone and Crushed Stone
Florida ranks as the second-largest producer of crushed stone in the United States, behind only Texas. Nationally, about 69% of crushed stone is limestone or a closely related rock called dolomite, and Florida’s geology is especially rich in both. The state’s bedrock is essentially a thick platform of limestone built up over millions of years from ancient marine sediments.
Around 70% of crushed stone in the U.S. goes toward construction aggregate, primarily for road building and maintenance. Another 20% feeds cement manufacturing. The remaining share is split among lime production, agricultural uses, and specialty chemical applications. In a state that builds as aggressively as Florida does, local limestone quarries are essential infrastructure. Federal transportation funding through the 2021 Infrastructure Investment and Jobs Act has further increased demand for these materials nationwide.
Heavy Mineral Sands
Florida’s sandy soils contain deposits of heavy minerals, defined in state law as sand-borne minerals with a specific gravity of at least 2.8. The key minerals extracted are ilmenite, rutile, leucoxene, zircon, and staurolite. Each serves a distinct industrial purpose.
- Ilmenite and rutile are the primary raw materials for manufacturing titanium dioxide, a bright white pigment. That pigment goes into paints, varnishes, lacquers, plastics, and paper. If you’ve painted a wall white, the color likely traces back to titanium minerals like these.
- Zircon is sold to the ceramics industry, where its heat resistance and hardness make it valuable for tiles, sanitaryware, and refractory linings.
- Staurolite is used as an industrial abrasive, often for sandblasting and surface preparation.
Heavy mineral sand mining typically involves dredging or dry-mining surface sand deposits, separating the heavy grains from ordinary sand, and then sorting individual minerals using their differences in density and magnetic properties.
Fuller’s Earth Clay
Fuller’s earth is a type of clay prized for its exceptional ability to absorb oils, grease, and color from liquids. The name comes from “fullers,” textile workers who historically used the clay to pull grease and fat out of woolen cloth. The first U.S. discovery of fuller’s earth happened in 1893 near Quincy, Florida, and mining began in Gadsden County two years later.
The deposit extends from Gadsden County northward into Georgia. A separate historic mine also operated in Marion County. Today, fuller’s earth is used in products ranging from cat litter and industrial absorbents to oil refining and cosmetics. Its capacity to soak up liquids and strip impurities from oils of animal, vegetable, and mineral origin keeps it in steady demand.
Peat
Florida is one of the top five peat-producing states in the country, alongside Illinois, Maine, Michigan, and Minnesota. Together these five states account for 98% of all peat sold in the U.S. Peat is partially decomposed plant material harvested from wetland areas, and its primary market is horticulture. It serves as a key ingredient in potting mixes, nursery growing media, golf course construction, mushroom cultivation, and earthworm culture medium. Demand for peat tracks closely with the gardening and landscaping industries.
Land Reclamation After Mining
Florida law requires mining companies to restore land after operations end. The rules apply to all new mines and any surface areas disturbed after January 1, 1989. Contouring of the landscape must begin and finish within one year after mining stops in a given area. Replanting must follow as soon as practical and wrap up within one year of final contouring. All reclamation work, from reshaping the land through revegetation, must be completed within three years of a mine shutting down.
If a mine goes idle for more than 12 months, the operator faces a choice: begin reclamation immediately at a pace of at least 1,000 feet of shoreline or pit wall every three months, post a financial bond to cover future restoration costs, or start reclaiming an equivalent area of non-mandatory land at the same rate. If a mine sits inactive for more than two years, full reclamation requirements kick in regardless. These rules ensure that mined land in Florida gets returned to a usable state, with restored drainage, wetlands, and surface water management that meet environmental standards.