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Bone Valley

Bone Valley is a phosphate mining district in central Florida encompassing portions of Hardee, Hillsborough, Manatee, and Polk counties, containing the largest known phosphate reserves in the United States, which supply over 60 percent of national production.^[1]^[2] The region's name originates from the abundance of fossilized vertebrate remains, including those of the Palmetto Fauna, preserved in the phosphatic sediments of the Bone Valley Formation, a late Miocene to Pliocene deposit formed from ancient marine environments rich in organic remains.^[3] These deposits consist primarily of land-pebble phosphate, a matrix of quartz, clay, and phosphate minerals extracted through large-scale open-pit operations.^[4] Phosphate extraction in Bone Valley began in the 1880s following the discovery of high-grade deposits along the Peace River, initially by manual methods before mechanization enabled industrial-scale production essential for fertilizers, animal feed, and industrial chemicals.^[5] The industry has generated substantial economic value, supporting jobs and contributing to global food security through phosphorus supply, yet it has also produced environmental challenges such as groundwater contamination risks and the accumulation of phosphogypsum waste in towering stacks that require ongoing management to prevent structural failures or radionuclide leaching.^[6]^[7] As reserves in the core area deplete, mining has shifted southward, prompting debates over long-term sustainability and land reclamation efforts that aim to restore mined pits into lakes and wetlands.^[8]

Geography and Geology

Location and Extent

Bone Valley encompasses portions of Hardee, Hillsborough, Manatee, and Polk counties in central Florida, forming a key phosphate mining district east of Tampa Bay.^[9]^[10] The region extends roughly 60 miles in a north-south direction, primarily along the course of the Peace River, with minable phosphate deposits covering approximately 1.3 million acres.^[11] The terrain consists of flat to gently rolling lowlands characteristic of peninsular Florida, with elevations generally ranging from 50 to 150 feet above sea level and surface layers of sandy soils.^[12] Despite its name, Bone Valley represents a relative topographic high point within the state rather than a true valley, situated amid the broader flatlands of the Florida Platform.^[12] Its location provides proximity to coastal ports via Tampa Bay and access to inland transportation corridors, enhancing logistical connectivity.^[9]

Geological Formation and Phosphate Deposits

The phosphate deposits of Bone Valley formed during the Miocene epoch, approximately 15 to 20 million years ago, through the accumulation of marine sediments in shallow coastal environments across central Florida. These sediments primarily consist of phosphatic pebbles, grains, bone fragments, and teeth derived from the remains of marine organisms, which concentrated via winnowing and sorting processes in low-energy depositional settings such as lagoons and nearshore zones.^[13] The material was reworked from older phosphatic-rich strata, including the underlying Hawthorn Group, leading to a lag deposit enriched in apatite minerals. The Bone Valley Member, part of the Peace River Formation, hosts the majority of these deposits and is characterized by interbedded layers of pebble phosphate, quartz sand, and clayey phosphorite, with phosphate content often exceeding 30% P₂O₅ in high-grade zones.^[13] This member typically comprises two distinct pebble beds separated by sandy-clayey phosphorite units, reflecting episodic sedimentation and reworking events.^[13] The formation's matrix includes siliclastic minerals like quartz and clays such as smectite and palygorskite, which contribute to the deposits' economic viability due to their accessibility at shallow depths of 20 to 50 feet.^[14] These reserves represent the highest-grade and most readily extractable phosphate in the United States, with historical geological assessments estimating billions of tons of phosphate rock across the district. Bone Valley serves as the core of Florida's land-pebble phosphate district, which supplies approximately 75% of the nation's phosphate rock production.^[15] The deposits' concentration stems from Florida's unique tectonic stability and subtropical paleoenvironment, which preserved and enriched the phosphatic lag without significant metamorphic alteration.

History

Early Exploration and Initial Mining (1880s–1920s)

In May 1881, Captain J. Francis LeBaron, a civilian engineer with the U.S. Army Corps of Engineers, discovered phosphate pebbles during a survey of the Peace River south of Fort Meade in central Florida, an area later central to the Bone Valley deposits.^[16]^[4] This finding, amid explorations for navigable waterways, revealed concentrations of phosphatic pebbles in river gravels, prompting initial prospecting for commercial potential.^[17] Early extraction relied on manual labor and rudimentary dredging from riverbeds, with operations beginning near Mulberry and along the Peace River.^[16] The Arcadia Phosphate Company initiated the first tentative mining in the Bone Valley vicinity in 1888, shipping Florida's initial commercial load of river pebble phosphate that May.^[18] These efforts yielded small-scale output, often limited to thousands of tons annually, as workers hand-sorted pebbles from dredged sediments transported by barge to ports like Punta Gorda.^[4] The discovery fueled a speculative boom, attracting over 200 companies to central Florida within a decade and driving land prices along the Peace River from $1.25 to $300 per acre.^[16] Pioneering firms, including the Florida Phosphate Company at Phosphoria and Pharr Phosphate Company at Pebbledale, commenced land-pebble mining in 1891, shifting focus from riverbeds to overlying gravel deposits as Bone Valley's matrix proved richer and more accessible.^[18]^[4] By around 1910, viability of Bone Valley's land-based deposits led to broader adoption of steam shovels for overburden removal, transitioning from labor-intensive river methods to systematic pit excavation at sites like Mulberry.^[19]^[4] This evolution supported companies such as American Cyanamid in early land-pebble operations west of Brewster, with annual production scaling from early peaks near 125,000 tons in 1893 to millions of tons by the 1920s amid growing demand for fertilizers.^[20]^[4]

Mid-20th Century Expansion

Following World War II, phosphate mining in Bone Valley underwent substantial industrialization, driven by increased agricultural fertilizer demand to support postwar food production and export needs. The shift from exporting raw phosphate rock to establishing local processing plants began in the late 1940s and early 1950s, enabling companies to produce finished fertilizers on-site and reducing transportation costs.^[21] This change coincided with technological advancements in dragline excavators, which had been introduced in the 1920s and 1930s but scaled up for large-scale land-pebble strip mining in the Bone Valley's matrix deposits, allowing efficient removal of overburden and extraction of phosphate-rich material. Major firms, including Swift & Company at its Agricola operations and Armour Fertilizer Works, consolidated influence during the 1950s, alongside entities like the Phosphate Mining Company at Nichols and International Minerals & Chemical Corporation.^[17] These companies accounted for a significant share of U.S. phosphate output, with ten leading producers controlling 80 percent of national production by the decade's end.^[22] Operations expanded to meet demands tied to national agricultural policies and Cold War-era food security efforts, including post-Korean War initiatives to enhance domestic and allied crop yields through subsidized farming. By the 1960s and into the 1970s, annual phosphate rock production in Florida, predominantly from Bone Valley, had intensified, with output reaching approximately 30 million short tons by the early 1970s to supply over 75 percent of U.S. needs.^[18] Infrastructure developments, such as enhanced rail connections via lines like the Winston & Bone Valley Railroad, facilitated bulk transport of raw matrix and processed products to ports for export, supporting the industry's integration into global fertilizer markets.^[23] This era's growth transformed Bone Valley into a hub of heavy industry, with draglines operating continuously to excavate vast open pits.^[24]

Post-1970 Developments and Industry Consolidation

The phosphate mining industry in the Bone Valley underwent substantial consolidation from the 1980s onward, driven by economic pressures and the need for scale in a maturing resource sector. By the early 2000s, mergers reduced the number of independent operators, with The Mosaic Company emerging as the primary entity following its formation on October 22, 2004, via the combination of IMC Global Inc. and Cargill Incorporated's crop nutrition division.^[25] This restructuring integrated key phosphate rock mining and processing assets in central Florida, enabling efficiencies in production and distribution.^[26] Further consolidation occurred through Mosaic's 2013 acquisition of CF Industries Holdings Inc.'s South Pasture phosphate mine and related facilities in Hardee County, solidifying its dominance over approximately 75 percent of Florida's phosphate output.^[27] Facing depletion of accessible shallow reserves by the late 20th century, industry operators shifted focus to deeper phosphate matrix layers, extending the viable lifespan of Bone Valley deposits into the 21st century. Annual mining disturbs 3,000 to 6,000 acres, reflecting sustained extraction rates amid these adaptations.^[8] Reclamation programs, mandated since the 1970s, have progressed such that ten of Florida's 28 phosphate mines achieved 100 percent reclamation and release from obligations by 2025, with ongoing efforts prioritizing wetland restoration and alternative land uses on disturbed sites.^[1] In the 2020s, Bone Valley operations produce over 60 percent of U.S. phosphate rock, underpinning roughly 75 percent of domestic fertilizer production and contributing to global agricultural supply chains.^[2] U.S. Geological Survey data indicate U.S. phosphate rock output reached 20 million metric tons in 2023, with Florida's central district maintaining its lead despite international competition.^[28] Florida Department of Environmental Protection reports emphasize enhanced efficiency measures, including optimized resource recovery, to address depletion risks while complying with regulatory standards.^[1]

Mining Operations

Extraction and Processing Techniques

Phosphate extraction in the Bone Valley utilizes open-pit strip mining, where large electric walking draglines with buckets holding 45 to 65 cubic yards remove overburden and excavate the underlying matrix.^[1] These draglines, operating continuously, strip away 15 to 50 feet of overburden to access the phosphate-bearing matrix layer, which typically measures 10 to 30 feet in thickness and consists of phosphate pebbles intermixed with sand and clay.^[17] The excavated matrix is disaggregated on-site into a slurry using high-pressure water monitors, then pumped via pipelines to nearby beneficiation plants for processing.^[29] Beneficiation involves desliming to remove fine clays, screening to separate coarser fractions, and froth flotation to concentrate phosphate particles, achieving separation efficiencies that recover over 90% of the valuable phosphate.^[30] This process yields a phosphate rock concentrate grading approximately 30% P₂O₅, with sand tailings returned to mined areas for reclamation and clay wastes settling in dedicated ponds.^[31] Subsequent processing of the concentrate into phosphoric acid via the wet method—reacting rock with sulfuric acid—produces phosphogypsum as a primary byproduct, which is dewatered and stacked in massive phosphogypsum containment structures known as gypstacks to manage the low-radioactivity waste.^[9] Annual operations across Bone Valley mines process in excess of 100 million tons of raw matrix to support these extraction and beneficiation techniques, optimized for the region's shallow, high-grade deposits.^[12]

Transportation and Infrastructure

Rail transportation forms the backbone of phosphate logistics in Bone Valley, with dedicated lines operated by CSX Transportation hauling the bulk of output from mining and processing sites to export terminals. These lines connect to deep-water port facilities such as CSX's Rockport Terminals on Tampa Bay, which specialize in loading phosphate rock mined from the region for overseas shipment.^[32]^[33] Historically, infrastructure began with short rail spurs developed in the 1920s to link early mines to ports like Tampa, evolving into extensive networks integrated with modern intermodal operations by the late 20th century.^[34] Unit trains, consisting of 60 to 85 hopper cars, transport phosphate loads typically ranging from 6,000 to 8,500 tons per shipment to Tampa-area facilities, enabling efficient bulk movement over distances that would otherwise burden roadways.^[35] Rail accounts for the majority of phosphate freight in Florida, as evidenced by 2003 transportation expenditures of $162.1 million for rail compared to $36.5 million for trucks, underscoring its dominance in volume and cost-effectiveness for long-haul export. Port infrastructure, including specialized loading docks at Rockport, further supports this by facilitating direct vessel transfers with minimal intermediate handling.^[32] To limit road dependency, operations incorporate pipelines for inputs like ammonia and water recirculation, alongside rail-centric product export, thereby reducing truck volumes on regional highways.^[36] Rail's efficiency is notable, emitting approximately 75% fewer greenhouse gases per ton-mile than trucking, according to industry analyses of federal data, which aligns with metrics for heavy bulk commodities like phosphate.^[37] This modal preference has persisted since the industry's expansion, with CSX lines—successors to earlier Seaboard routes—serving as primary conduits from Bone Valley to Gulf Coast ports.^[35]

Economic Importance

Contributions to Local and State Economy

The phosphate mining operations in Florida's Bone Valley region, centered in Polk, Hardee, and surrounding counties, directly employ approximately 8,400 workers, with wages and benefits exceeding state averages due to the specialized and hazardous nature of extraction and processing roles.^[38] These positions, primarily held by companies like Mosaic and Nutrien, contribute to higher local household incomes, with Mosaic alone reporting $809 million in annual wages for its over 3,000 Florida employees in 2022.^[39] The industry's payroll supports elevated living standards in rural areas where alternative high-wage opportunities are limited, fostering population stability and reducing out-migration in Polk County, where mining accounts for a substantial share of private-sector employment. Annual economic output from Bone Valley phosphate activities generates around $2.9 billion in direct value, as reported by Mosaic, with multiplier effects extending to $5.03 billion in the broader Tampa region through supplier purchases and logistics.^[39]^[38] This includes $1.07 billion spent annually with over 420 Florida-based suppliers for equipment, services, and materials, bolstering local manufacturing and transportation sectors.^[39] In Polk County, phosphate mining underpins a significant portion of GDP, with industry projections indicating that each dollar of mining output stimulates additional regional economic activity, sustaining retail, housing, and infrastructure development dependent on mining-related spending.^[40] State and local governments derive substantial fiscal benefits from severance taxes levied at $1.61 per ton of phosphate rock extracted, with Mosaic paying $18.9 million in such taxes in recent years and Florida phosphate firms contributing cumulatively $1.5 billion since 1971.^[39] These revenues, totaling $154 million annually from Mosaic operations alone in state and local taxes, fund public education, infrastructure maintenance, and land conservation programs, as allocated under Florida statutes.^[39]^[41] In mining-dependent counties like Polk, property and sales taxes tied to industry facilities further enhance budgets for schools and roads, offsetting the absence of equivalent revenue streams in non-mining locales.^[40]

Global Agricultural Impact

Phosphate rock mined in the Bone Valley region supplies a substantial portion of the phosphorus component in NPK fertilizers used globally in agriculture. Florida's production accounts for approximately 75% of the phosphate rock mined in the United States, making it a critical domestic source that supports fertilizer manufacturing and helps buffer against international supply volatility.^[15] This output is essential for addressing phosphorus deficiencies in soils, where application of phosphate fertilizers has been shown to increase crop yields by 10-38% in major staples like wheat and maize, depending on soil conditions and application rates.^[42] Such yield enhancements underpin elevated agricultural productivity, contributing to the United States' position as a leading exporter of food commodities.^[43] The strategic importance of Bone Valley's phosphate was underscored during the 2022 global fertilizer market disruptions triggered by the Russia-Ukraine conflict, which curtailed exports from major producers like Russia and Belarus, leading to phosphate price surges of over 50% in early 2022 and heightened risks to food security.^[44]^[45] U.S. reliance on Florida-sourced phosphate mitigated potential domestic shortages, stabilizing fertilizer availability for American farmers amid global supply chain strains that affected planting decisions worldwide.^[46] Without such reserves, the cascading effects on crop production could have exacerbated food price inflation and reduced harvests in phosphorus-dependent regions. Looking ahead, the Bone Valley's deposits remain vital for sustaining fertilizer supplies amid rising global food demands, with United Nations projections estimating world population growth to 9.7 billion by 2050, necessitating continued yield improvements to ensure food security.^[47] Empirical data affirm phosphorus's causal role in root development, energy transfer, and overall plant vigor, directly linking mining outputs to agricultural resilience against population pressures and soil nutrient depletion.^[48]

Environmental and Health Considerations

Land Disturbance and Water Usage

Phosphate mining operations in the Bone Valley disturb between 3,000 and 6,000 acres of land annually.^[1] Of this area, approximately 25–30% consists of wetlands or other surface waters.^[1] Approximately 25% of the total mined land in the region was originally wetland or open water, with the remainder primarily grassland or shrubland.^[49] Since mining began in the 1880s, cumulative disturbance has affected roughly 500,000 acres, based on land cover change assessments from the U.S. Geological Survey's National Land Cover Database.^[49] The process entails removing overburden with large draglines to expose the phosphate matrix, leading to direct clearing of native vegetation and temporary elimination of terrestrial and aquatic habitats in active pits.^[5] Water consumption supports matrix extraction and transport, where groundwater and surface water are used to create slurries piped to processing plants, with operations drawing substantial volumes daily.^[1] Recycling rates exceed 80% through closed-loop systems that return process water to storage ponds after settling.^[50] Dewatering of pits and aquifer recharge dynamics are regulated via Environmental Resource Permits issued by the Florida Department of Environmental Protection, which mandate monitoring of drawdown effects on the underlying Floridan aquifer.^[1] These permits require operators to track groundwater levels and quality to address potential localized impacts from pumping, such as cone-of-depression formation around mine sites.^[6] Initial land clearing disrupts habitats by removing soil layers and exposing subsurface materials, causing direct loss of wetland functions like flood storage and wildlife corridors until reclamation phases.^[49] However, the excavation process creates deep pits that, following initial disturbance, form lakes capable of supporting aquatic biodiversity surpassing pre-mining levels in metrics such as fish density, due to nutrient-rich sediments and engineered depths favoring certain species.^[8] Water management practices, including seepage recovery, help sustain regional hydrology while minimizing net withdrawal from aquifers beyond operational needs.^[6]

Reclamation and Restoration Outcomes

Florida's phosphate mining reclamation statute, enacted in 1975, mandates the restoration of all lands disturbed after July 1 of that year to achieve self-sustaining biological systems capable of supporting wildlife, agriculture, or other beneficial uses.^[51]^[52] Reclamation plans must be approved by the Florida Department of Environmental Protection, with performance standards requiring contouring, soil stabilization, revegetation, and hydrology restoration to pre-mining conditions where feasible.^[53] As of 2015, approximately two-thirds of lands disturbed by phosphate mining in Florida had been reclaimed, converting former mine pits into productive ecosystems including wetlands, forests, and pastures.^[54] Reclaimed Bone Valley sites have demonstrated measurable ecological recovery, with former matrix pits evolving into oligotrophic lakes that support diverse aquatic life and recreational fisheries.^[55] These lakes, often stocked with bass and other sportfish, have become viable habitats mimicking natural Florida wetlands, hosting species such as wading birds and amphibians.^[56] Studies by the Florida Industrial and Phosphate Research Institute indicate that revegetated areas achieve canopy closure and native plant diversity comparable to undisturbed sites within 10-20 years, enabling wildlife refuges that sustain regional biodiversity without ongoing intervention.^[57] Over 180,000 acres in the Peace River watershed alone have undergone such transformations, yielding lands used for grazing, silviculture, and conservation.^[58] Economic analyses affirm the viability of these outcomes, as reclaimed lands generate value through agriculture, timber production, and ecotourism, offsetting reclamation expenditures estimated in the hundreds of millions annually across active operations.^[59] For instance, Mosaic Crop Nutrition reports compliance with statutory reclamation rates, with fully released sites—certified as stable and functional—exceeding 100% of disturbed acreage in some districts.^[31] This contrasts with claims of permanent degradation, as empirical data from monitored sites show sustained productivity, including converted farmlands and fisheries that contribute to local economies without evidence of widespread ecological collapse.^[1]

Radiation and Public Health Data

Phosphogypsum produced in Bone Valley phosphate processing contains trace concentrations of uranium-238 series radionuclides, including radium-226 at levels averaging 50-80 picocuries per gram (pCi/g), which decays to radon-222 gas.^[60] These stacks are regulated under EPA's National Emission Standards for Hazardous Air Pollutants (NESHAPs), Subpart R, requiring radon flux not to exceed 20 pCi/m²/s on average across the stack surface for both active and inactive facilities.^[61] Compliance monitoring by operators, verified by state agencies, ensures emissions remain below this threshold, resulting in estimated public radiation doses from stack radon of less than 1-5 millirems (mrem) per year at nearby distances.^[62] The Florida Department of Health (DOH) and Department of Environmental Protection conduct routine air, soil, and water sampling around gypstacks and mining sites, with measured radiation levels consistently below EPA action levels and federal dose limits of 10 mrem/year for radon-related exposures.^[63] Gamma radiation surveys post-mining show increments attributable to phosphogypsum typically under 2-5 microroentgens per hour (µR/h) above background, posing negligible risk compared to natural terrestrial radiation in central Florida's phosphatic soils, which averages 5-10 µR/h.^[64] Epidemiological studies of phosphate workers in Florida report standardized mortality ratios (SMRs) for all cancers near unity (e.g., SMR 0.98 overall), with a modest elevation for lung cancer (SMR 1.19) versus U.S. rates, potentially confounded by occupational dust, smoking, or other non-radiological factors rather than stack emissions.^[65] Population-based incidence data from Florida's Cancer Registry indicate no statistically significant excess of lung or other radiation-linked cancers in Bone Valley counties (e.g., Polk, Hardee) relative to state averages of 464 cases per 100,000 annually, after age-adjustment.^[66] Earlier community studies suggesting associations with nonsmoker lung cancer have not been replicated in recent longitudinal analyses, which emphasize multifactorial causation including higher regional smoking prevalence.^[67] Gypstack structural failures, such as the 1968 Mulberry sinkhole or 2004 Riverview breach, occur infrequently (fewer than one per decade across operations) and trigger immediate containment and remediation under state oversight, with post-incident monitoring confirming no measurable increase in off-site radiation exposure or health outcomes.^[68] Florida's natural background radiation, elevated by uranium-rich sediments, contributes 50-150 mrem/year to residents—far exceeding stack-derived doses—highlighting that mining byproducts add minimally to overall exposure profiles.^[60]^[64]

Controversies and Regulation

Expansion Disputes and Legal Challenges

In 2019, the United States Court of Appeals for the Eleventh Circuit upheld a permit issued by the U.S. Army Corps of Engineers authorizing The Mosaic Company to expand phosphate mining operations in the Bone Valley region, dismissing challenges from environmental groups that contended the agency inadequately evaluated cumulative impacts on wetlands and water resources from interconnected mining activities.^[69] The ruling affirmed the permit's compliance with the Clean Water Act, enabling Mosaic to proceed with wetland fills necessary for mine growth while requiring mitigation banking to offset ecological losses. Legal opposition to expansions, such as those at Mosaic's South Fort Meade facility, has centered on concerns over radionuclide migration from phosphogypsum stacks and potential aquifer drawdown affecting the Floridan Aquifer. Environmental organizations, including the Sierra Club and Center for Biological Diversity, have argued in federal suits that increased mining exacerbates risks of water contamination by heavy metals and radioactive elements like radium-226, referencing phosphogypsum's elevated levels compared to natural soils.^[70] A 2012 settlement resolved a related South Fort Meade dispute by permitting phased expansion under enhanced monitoring and wetland restoration commitments, with Mosaic agreeing to independent audits of water quality data.^[71] Proponents, including Mosaic and the Florida Department of Environmental Protection (DEP), maintain that state-approved environmental resource permits for projects like the Ona expansion incorporate hydrologic modeling and baseline monitoring demonstrating no exceedance of drinking water standards for radionuclides or other contaminants post-mining. DEP evaluations for such expansions require demonstration of sustainable water use and containment integrity for waste stacks, with long-term data from operational mines showing radionuclide concentrations in groundwater remaining below EPA maximum contaminant levels absent direct causal links to extraction activities.^[69] Industry stakeholders emphasize that phosphate yields are essential for global fertilizer production, with Florida operations supplying over 70% of U.S. needs, and cite peer-reviewed hydrogeologic studies indicating natural attenuation processes mitigate diffuse risks in karst terrain. Local zoning conflicts have also impeded expansions, as seen in a 2019 lawsuit where phosphate developer HPS II Processing LLC sought $300 million in damages from Union County after commissioners denied rezoning for a proposed mine, alleging inverse condemnation and violation of vested rights; the case settled in 2022 with mutual dismissal, preserving pathways for mining approvals under revised local ordinances favoring resource extraction.^[72] These resolutions underscore tensions between property rights and community concerns over land use, with courts often prioritizing state mineral policies over restrictive county zoning where economic contributions to agriculture are deemed overriding.

Balancing Economic Benefits with Environmental Claims

Florida's phosphate mining regulations, codified in state law effective July 1, 1975, mandate environmental impact assessments for permitting and require reclamation of all disturbed lands through contouring to stable slopes, revegetation with native species, and restoration of hydrologic functions to approximate pre-mining conditions.^[73] ^[1] These provisions ensure that operators address land disturbance and water quality prior to permit approval, with oversight by the Florida Department of Environmental Protection. Complementing state rules, federal compliance under the Clean Water Act since the 1970s involves Section 404 permits from the U.S. Army Corps of Engineers, regulating dredge and fill activities in wetlands and surface waters to minimize aquatic impacts.^[74] Severance taxes on phosphate extraction, imposed since 1971 at rates tied to production value, generate revenues dedicated to reclamation funds and related environmental programs, illustrating a mechanism where industry output directly finances mitigation and restoration.^[40] For instance, these taxes support the Nonmandatory Land Reclamation Program for pre-1975 sites and ensure post-mining safety compliance, with over 10 former mines fully reclaimed and released from obligations as of 2025.^[75] ^[1] Critics from environmental advocacy groups argue for stricter oversight, citing risks from phosphogypsum stacks and wastewater, yet empirical data reveal successful risk mitigation, with state-monitored water quality standards met in reclaimed areas and no widespread verification of doomsday-scale ecological collapse.^[1] Industry perspectives highlight that excessive regulatory expansion could constrain access to Bone Valley's estimated remaining reserves—critical for global fertilizer supply—amid surging demand for phosphate rock, which underpins crop yields and food security for billions.^[2] ^[49] Economic evaluations, such as those from the U.S. Bureau of Mines, quantify the phosphate sector's role in enhancing agricultural productivity through fertilizers derived from Bone Valley output, which constitutes a significant share of U.S. production and supports international supply chains; these benefits, including sustained global food output, empirically exceed the costs of regulated environmental safeguards, as reclamation yields functional habitats and tax-funded conservation offsets localized disturbances.^[22]^[2] Such trade-offs prioritize causal outcomes like verifiable productivity gains over speculative harms, with regulatory evolution enabling over 300,000 acres of potential restoration while preserving reserve viability.^[51]

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Jun 24, 2005 · 4.9 Phosphate Mining in Bone Valley, Florida ... state movement are phosphate shipments to fertilizer plants and the Port of Tampa, and.
[35]
https://www.trainorders.com/discussion/read.php?2,3896574
[36]
P: Phosphorus - The Center for Land Use Interpretation
Mosaic is a new company made up of old companies, formed in 2004 by merging Cargill's crop nutrition division and IMC Global, both of which were already among ...
[37]
[PDF] The Positive Environmental Effects of Increased Freight by Rail ...
Abstract. Moving freight by rail instead of truck lowers greenhouse gas emissions by up to 75%, on average. AAR analysis of federal data finds: If 25% of ...Missing: phosphate mining
[38]
Our Industry - Florida Phosphate Council
The industry's economic impact in the Tampa region is an estimated $5.03 billion. ... industry in Florida, supporting its competitiveness and contribution ...
[39]
[PDF] MOS-Economic-Fact-Sheet-Nov-2023.pdf - Mosaic Florida Phosphate
Florida's phosphate companies have paid approximately $1.5 billion in state severance taxes cumulatively since 1971. Mosaic currently pays a state tax of $1.61 ...
[40]
[PDF] Economic Significance - of the Florida Phosphate Industry
Oct 12, 2025 · of Florida phosphate rock in the past, it is expected that rock ... Florida phosphate rock production estimated at 38 million short tons in 1975.Missing: 1950-1970 | Show results with:1950-1970
[41]
The 2025 Florida Statutes - Online Sunshine
The tax shall be collected, administered, and enforced by the department. (2) The tax rate shall be $1.61 per ton severed, except for the time period beginning ...Missing: mining | Show results with:mining
[42]
The Impact of Different Phosphorus Fertilizers Varieties on Yield ...
Jun 18, 2024 · The results showed that different P fertilizers increased the average yield of wheat and maize by 21.2–38.0% and 9.9–16.3%, respectively.
[43]
Five fertilizer market dynamics that tell the story of 2022
Dec 21, 2022 · The global markets for nitrogen, phosphates and potash were already in a tightened state following strong demand driven by the Covid-19-induced ...
[44]
[PDF] Phosphate Rock - USGS.gov
In 2022, the global phosphate fertilizer market experienced supply disruptions, high fertilizer prices in the first half of the year, and lower consumption ...
[45]
Global Fertilizer Market Challenged by Russia's Invasion of Ukraine
Sep 18, 2023 · That curtailed already short fertilizer supplies, driving up prices over 50 percent from February to April 2022. Because fertilizer is important ...<|separator|>
[46]
Fertilizer Outlook: Global Risks, Higher Costs, Tighter Margins
Sep 11, 2025 · In the lead-up to the 2022 crop year, fertilizer prices surged to record highs, driven by tight global supplies, energy shocks and trade ...
[47]
World population projected to reach 9.8 billion in 2050, and 11.2 ...
World population projected to reach 9.8 billion in 2050, and 11.2 billion in 2100. The current world population of 7.6 billion is expected to reach 8.6 billion ...
[48]
Phosphorus Plays Key Roles in Regulating Plants' Physiological ...
Aug 3, 2023 · P application improved plant growth. P fertilization increased the leghemoglobin (92%), reduced proline content (−69%) and protected membranes ...
[49]
Annual NLCD Assessment: Phosphate Mining and Land Cover ...
Dec 12, 2024 · ... percent of U.S. production (FLDEP, 2024 and FIPR Institute, 2020). ... Approximately 25 percent of the Bone Valley area mined was originally ...
[50]
What does Mosaic do to conserve water?
Aug 5, 2022 · Mosaic voluntarily reduced its daily permitted groundwater usage by nearly 30 million gallons per day (MGD), a dramatic reduction of 30 percent.Missing: billion recycled
[51]
Landscape restoration following phosphate mining: 30 years of co ...
The majority of research on phosphate mine restoration, since it began in the mid 1970s, has been concerned with the restoration of the remaining mined lands ...Missing: developments | Show results with:developments
[52]
Life After Mining: Understanding Reclamation and Release - Mosaic
May 14, 2024 · “Each habitat type has specific standards that must be met before the state signs off on the release. With regards to wetlands, we reclaim all ...
[53]
Fla. Admin. Code Ann. R. 62C-39.008 - Reclamation Standards
1. All lands shall be reclaimed to a neat, clean condition by removing or adequately burying, where allowed by law, all visible debris, litter, junk, worn-out ...Missing: mandates | Show results with:mandates
[54]
Eaters of the earth: How the fertilizer industry leaves a ... - The Counter
Apr 22, 2020 · Phosphate rock allowed farmers to stop using manure fertilizer, kicking us into the modern era of agriculture.
[55]
Does 'reclaiming' old phosphate mines live up to the promise? - WUFT
Florida's old phosphate mines have been turned into housing developments, parks, bass lakes, golf courses and restored wetlands.
[56]
[PDF] Landscape restoration following phosphate mining: 30 years of co ...
The southern most primary district is also known as the “Bone Valley” formation. North Florida phosphate mining began in the mid 1960s and continues today near ...
[57]
Florida Industrial & Phosphate Research Institute (FIPR)
These resources cover a wide range of topics related to phosphate mining, processing, environmental management, and industrial applications—supporting ...
[58]
[PDF] Recent trends in phosphate mine reclamation in the United States
About. 85 percent of the combined total U.S. phosphate production comes from Florida and North Carolina, while the western states account for. IO percent, and ...
[59]
The economic feasibility of reclaiming phosphate mined lands with ...
Feb 12, 2007 · Central Florida produces 75% of the United States' and 25% of the world's phosphate supply, primarily used for fertilizer (IMC Phosphates, 2002) ...Missing: contribution | Show results with:contribution<|separator|>
[60]
Radioactive Material From Fertilizer Production | US EPA
Aug 14, 2025 · Phosphogypsum, a waste product from manufacturing fertilizer, emits radon, a radioactive gas. It also contains the radioactive elements uranium, thorium and ...
[61]
Subpart R: National Emission Standards for Radon Emissions ... - EPA
Jun 3, 1992 · Subpart R protects from radioactive materials in phosphogypsum, limiting radon emissions from engineered stacks to 20 picocuries/m²/s, and ...Missing: mrem | Show results with:mrem
[62]
40 CFR Part 61 Subpart R -- National Emission Standards for Radon ...
Inactive phosphogypsum stacks must emit no more than 20 pCi/(m2-sec) of radon-222. Owners must test for radon-222 flux within 60 days of becoming inactive.Missing: exposure mrem
[63]
[PDF] Bill Analysis and Fiscal impact statement - Florida Senate
Mar 24, 2025 · To monitor this situation, DOH takes soil, air, and water samples both before and after mining occurs and measures the radiation levels. Id. 9 ...
[64]
Natural Radiation in the Rocks, Soils, and Groundwater of Southern ...
May 21, 2019 · The primary origin of the radioactive isotopes is Miocene-aged phosphate deposits that can be enriched in uranium-238 and its daughter isotopes.
[65]
A Study Update of Mortality in Workers at a Phosphate Fertilizer ...
Nov 2, 2015 · With 10% confirmed deaths, they found a small excess of lung cancer mortality among phosphate workers when compared to U.S. rates, but not to ...
[66]
State Cancer Profiles > Incidence Rates Table
Latest 5-Year Average Incidence Rate Report for Florida by County. All Cancer Sites (All Stages^), 2017-2021. All Races (includes Hispanic), Both Sexes, Ages ...
[67]
An updated mortality follow-up study of Florida phosphate industry ...
Based on comparisons with national rates, lung cancer standardized mortality ratios (SMR) were slightly elevated among white (SMR = 1.19; 354 observed) and ...Missing: Bone Valley mining
[68]
[PDF] Via Certified Mail/Return Receipt Requested and E-mail - EPA
Feb 8, 2021 · A massive sinkhole in a phosphogypsum stack in Mulberry, Florida, which drained 215 million gallons of radioactive process wastewater and an ...<|separator|>
[69]
Appeals Court Upholds Permit Allowing Mosaic To Expand Mining ...
Nov 7, 2019 · A divided federal appeals court has backed a decision by the US Army Corps of Engineers to issue a permit sought by the phosphate company Mosaic for expanded ...Missing: disputes | Show results with:disputes
[70]
Lawsuit Launched Over EPA's Oversight Failure on Dangerous ...
Feb 13, 2024 · “The cradle is phosphate mining and the grave is the radioactive phosphogypsum waste dumped into gypstacks. The abandoned Piney Point gypstacks ...
[71]
Mosaic settles lawsuit over Florida mine expansion | Reuters
Feb 21, 2012 · Mosaic Co said it has settled a lawsuit filed by environmental groups including the Sierra Club that will now allow the fertilizer producer ...Missing: Bone Valley project
[72]
HPS II drops Union County phosphate mine lawsuit 2022-06-23
Jun 28, 2022 · ... lawsuit against Union County, Florida, which had been going on since 2019. ... HPS, Union County agree to dismiss $300M lawsuit. BY TRACY ...
[73]
Chapter 378 Section 021 - 2024 Florida Statutes - The Florida Senate
(1) The Department of Environmental Protection shall amend the master reclamation plan that provides guidelines for the reclamation of lands mined or ...Missing: mandates | Show results with:mandates
[74]
Areawide Environmental Impact Statement addressing phosphate ...
May 9, 2013 · The permits are required under Section 404 of the Clean Water Act, under which the Corps regulates dredge and fill activities in waters of the ...
[75]
Nonmandatory Land Reclamation Program
The Nonmandatory Land Reclamation Program provides funds for reclamation of property mined for phosphate prior to the 1975 introduction of regulatory ...Missing: mandates | Show results with:mandates