Lime: Stocks
Endless rock: kilns, fuel and carbon are the real limits
What this tab covers How much is left and how much is held. For minerals and energy: reserves, current output, years of supply and recycling for the top five countries. For farm commodities: production, ending stocks and stocks-to-use for the top five producers (USDA, October 2026). It also covers inventories and stockpiles.Top five countries: reserves, output and years of supply
| Country | Reserves limestone reserves (USGS: 'adequate for all countries with listed production') | Current output kt lime (2025e) | Years of supply | Recycling |
|---|---|---|---|---|
| China | – | 310,000 | – | n/a |
| India | – | 17,000 | – | n/a |
| United States | – | 15,000 | – | n/a |
| Russia | – | 12,000 | – | n/a |
| Brazil | – | 8,200 | – | n/a |
Recycling
Lime is consumed in use, so there is little true recycling. Paper mills regenerate large amounts of lime, some water plants regenerate it from softening sludge, and quicklime is regenerated in the carbide industry, all excluded from production data (USGS 2026). The EU end-of-life recycling input rate for limestone is 1% (EU CRM 2023). No country recycling rates are published.
USGS describes limestone reserves as adequate for every producing country and resources as very large, so no reserve life is meaningful. The constraints are kiln capacity, fuel and carbon costs, not rock. Lime is consumed chemically in most uses, so it is not recycled in the usual sense. Large quantities are regenerated in closed loops, however. Paper mills reburn lime mud, and water plants recover lime from softening sludge. These volumes are excluded from production to avoid double counting. There is no strategic stockpile, and quicklime stores poorly because it reacts with moisture.
Large quantities of lime are regenerated by paper mills, some water-treatment plants and the carbide industry, but are not counted as production.