Producer
The Mosaic Company
World's largest US potash and phosphate producer. Esterhazy K1 and K2 mines (Saskatchewan) began experiencing managed brine inflows in 1985; managed for decades until Mosaic made the decisive choice to build the K3 underground mine (announced 2009, commissioned 2022) to replace K1/K2. K1/K2 closed 2021. K3 at Esterhazy is now the world's largest operating potash mine. Also operates Colonsay SK mine (conventional underground). The Esterhazy flooding saga represents the most consequential water-management incident in Saskatchewan potash history, requiring a $4B+ replacement mine investment.
9
Inputs supplied
3
Goods downstream
8
Facilities
0
Stories
What they make
9 inputs The Mosaic Company supplies
Click an input to see every good that depends on it, every country that produces it, and every other company in the supply chain.
chemical
Fluosilicic Acid (H2SiF6) for Municipal Water Fluoridation →
mineral
Potash (Muriate of Potash, MOP — KCl) →
mineral
Potash Ore — Muriate of Potash (MOP / KCl) →
mineral
Phosphate Rock (Sedimentary Apatite) →
mineral
Solution Mining Brine Water (Saskatchewan Potash) →
chemical
Sulfuric Acid (H₂SO₄) for Phosphate Fertilizer Production →
chemical
Sulfuric Acid (Wet Process Phosphoric Acid) →
mineral
Potash (Muriate of Potash / KCl) →
mineral
Phosphate Rock (Fluorapatite Ore) →
Where it shows up
Goods downstream
Essential goods that depend on something The Mosaic Company makes — pick one to see the full supply chain.
Where they make it
8 facilities
Mosaic Company -- Bartow Phosphate Complex →
USBartow, Polk County, Florida, USA · manufacturing_plant
Mosaic phosphate processing facility in Polk County, Florida. Produces phosphoric acid and MAP/DAP fertilizers; fluosilicic acid captured as mandatory scrubber byproduct. Mosaic is the largest US phosphate producer and therefore the largest US H2SiF6 supplier. Florida phosphate district faces long-term mine depletion and phosphogypsum waste stack environmental issues.
Mosaic Esterhazy K3 Potash Mine — Saskatchewan →
CASaskatchewan · mining
World's largest operating potash mine by annual production. K1/K2 legacy shafts plus the new K3 shaft (commissioned 2022) expanding capacity significantly. Esterhazy area historically known for brine inflows requiring continuous water management.
Mosaic Esterhazy K3 Potash Mine — Saskatchewan →
CAEsterhazy, Saskatchewan · mine
World's largest operating potash mine (commissioned 2022). Built to replace K1/K2 mines closed 2021 due to decades of managed brine inflows since 1985. K3 is a new underground conventional mine — NOT solution mining — but its genesis was a water-management crisis at K1/K2. K3 required $4B+ investment and 12+ years of permitting and construction. Esterhazy K3 demonstrates the capital cost of replacing aging SK potash infrastructure when water intrusion makes conventional mines unviable.
Mosaic Florida Sulfuric Acid Plant (Commissioned 2024) →
USCentral Florida (Polk County area) · manufacturing
New H2SO4 plant commissioned September 2024, integrated with Mosaic's phosphate operations. Purpose: reduce dependence on merchant H2SO4 imports and improve cost efficiency. Burns elemental sulfur sourced from Gulf Coast refineries.
Mosaic Four Corners Mine — Bone Valley, Florida →
USFlorida · mining
World's largest single phosphate mine by area (58,000 acres — 5× the size of Manhattan). Central to Florida's Bone Valley Formation, which has supplied most US phosphate for decades. Reserves are finite; expansion permits for adjacent areas face environmental opposition. South Fort Meade mine (adjacent, also Mosaic) described as 'living on borrowed time' without expansion approval.
Mosaic New Wales Phosphate Complex (Mulberry, FL) →
USMosaic South Fort Meade Mine, Florida →
USmining
One of the last active US phosphate mines (Hardee County, FL). Florida's Peace River phosphate district contains ~75% of US phosphate reserves but faces increasing regulatory pressure from water quality concerns. Current US reserve life estimated at ~25 years.
Mosaic – Esterhazy K3 Mine (Saskatchewan) →
CASaskatchewan
World's largest single potash mine by production capacity; K3 shaft commissioned 2023 replacing older K1/K2 shafts; ~6 Mt/yr MOP capacity; feeds Canpotex export marketing through Vancouver and Portland; Saskatchewan basin holds ~50% of world's known potash reserves
What else they do
Business segments
The company's full revenue map — where this supply-chain role fits within their broader business.
Potash (K3 Esterhazy — World's Largest Potash Mine)
38%Phosphate Mining & Processing (Florida)
40%Fluosilicic Acid — US Municipal Water Fluoridation
5%Mosaic Fertilizantes (Brazil — 35% Distribution Share)
17%
Intelligence
What's known
Sourced claims about this company's role in supply chains — chokepoints, concentration, incidents, dual-use connections.
Did you know2023
The Mosaic Company — America's largest phosphate fertilizer producer — is also the source of approximately 40% of the fluoride additive used in US municipal drinking water. Fluorine occurs naturally in phosphate rock (as fluorapatite, Ca₅(PO₄)₃F); when phosphate rock is dissolved in sulfuric acid to make phosphoric acid, the fluorine is released as hydrogen fluoride (HF) vapors. Rather than releasing HF as air pollution, Mosaic's Florida plants scrub the HF vapors with water to produce fluosilicic acid (H₂SiF₆), which is then diluted and sold to municipalities as their water fluoride additive. The Centers for Disease Control lists community water fluoridation as one of the 10 great public health achievements of the 20th century. 40% of that achievement — measured by fluoride supply — flows from the byproduct streams of phosphate fertilizer manufacturing at Mosaic's Florida plants.
US Centers for Disease Control and Prevention ↗Capacity2024
Mosaic's Florida Bone Valley phosphate formation — which supplies the majority of US domestic phosphate — is estimated to have 60-70 years of economically recoverable reserves remaining. There is no US substitute deposit of comparable scale; when Bone Valley is depleted, the US will join 100%-import dependency for phosphate alongside its existing 100%-import dependency for potash.
The Mosaic Company ↗Incident2025
In December 2024, Mosaic sold its 25% stake in Wa'ad Al Shamal Phosphate Company (MWSPC) — a fully integrated Saudi phosphate complex producing 3M+ MT/year DAP — to Ma'aden for $1.5 billion in Ma'aden equity shares. This transaction concentrated Saudi phosphate production (85%) under a single state-owned entity (Ma'aden) backed by Saudi Aramco's parent framework, while Mosaic received a ~20% equity stake in Ma'aden. The deal reflects a global trend of phosphate production consolidating under state-owned enterprises: OCP (Morocco, state-owned), Ma'aden (Saudi Arabia, state-owned), PhosAgro (Russia, state-linked), and Belaruskali/Urualkali (state-owned/controlled). Private sector phosphate producers are now a minority of global supply.
The Mosaic Company (Investor Relations) ↗Origin2023
The Mosaic Company was formed in 2004 by the merger of Cargill's crop nutrition business with IMC Global (a potash and phosphate company). IMC Global itself had been formed by the merger of International Minerals and Chemical Corporation and Freeport-McMoRan's fertilizer operations. The combined entity created the world's largest integrated potash and phosphate company. Mosaic's most consequential recent decision was the $4B+ K3 mine investment at Esterhazy, Saskatchewan: the original K1 and K2 mines (operating since the 1960s) had experienced managed brine inflows since 1985 — requiring continuous pumping of millions of gallons per day to prevent flooding. After 35 years of brine management, Mosaic announced K3 in 2009 and commissioned it in 2022, retiring K1/K2 in 2021. K3 is now the world's single largest operating potash mine by production capacity.
The Mosaic Company ↗