Occurrence of thorium
Thorium is found in small amounts in most rocks and soils. Soil commonly contains an average of around 6 parts per million of thorium. Thorium occurs in several minerals including thorite, thorianite and monazite. Thorianite is a rare mineral and may contain up to about 12% thorium oxide. Monazite contains 2.5% thorium, allanite has 0.1 to 2% thorium and zircon can have up to 0.4% thorium. Thorium-containing minerals occur on all continents. Thorium is several times more abundant in Earth's crust than all isotopes of uranium combined and thorium-232 is several hundred times more abundant than uranium-235.
Thorium concentrations near the surface of the Earth can be mapped using gamma spectroscopy. The same technique has been used to detect concentrations on the surface of the Moon; the near side has high abundances of relatively thorium-rich KREEP, while the Compton–Belkovich Thorium Anomaly was detected on the far side. Martian thorium has also been mapped by 2001 Mars Odyssey.
232Th decays very slowly but other thorium isotopes occur in the thorium and uranium decay chains. Most of these are short-lived and hence much more radioactive than 232Th, though on a mass basis they are negligible.
Thorium resource estimates
Present knowledge of the distribution of thorium resources is poor because of the relatively low-key exploration efforts arising out of insignificant demand. There are two sets of estimates that define world thorium reserves, one set by the United States Geological Survey and the other supported by reports from the OECD and the International Atomic Energy Agency. Under the USGS estimate, India, the United States, and Australia have particularly large reserves of thorium.India and Australia are believed to possess about 300,000 tonnes each; i.e. each has 25% of the world's thorium reserves. In the OECD reports, however, estimates of Australia's Reasonably Assured Reserves of thorium indicate only 19,000 tonnes and not 300,000 tonnes as indicated by USGS. The two sources vary wildly for countries such as Brazil, Turkey, and Australia, but both reports appear to show some consistency with respect to India's thorium reserve figures, with 290,000 tonnes and 319,000 tonnes.
Both the IAEA and OECD appear to conclude that India may possess the largest share of world's thorium deposits.
The IAEA's 2005 report estimates India's reasonably assured reserves of thorium at 319,000 tonnes, but mentions recent reports of India's reserves at 650,000 tonnes. A government of India estimate, shared in the country's Parliament in August 2011, puts the recoverable reserve at 846,477 tonnes. The Indian Minister of State V. Narayanasamy stated that as of May 2013, the country's thorium reserves were 11.93 million tonnes found in the three eastern coastal states of Andhra Pradesh, Tamil Nadu and Odisha. Additionally, reports suggest that large deposits may exist in the adjacent Bay of Bengal, and on the independent island nation of Sri Lanka.
The prevailing estimate of the economically available thorium reserves comes from the USGS, Mineral Commodity Summaries :
| Country | Reserves |
| Australia | 300,000 |
| India | 290,000 |
| Norway | 170,000 |
| United States | 160,000 |
| Canada | 100,000 |
| South Africa | 35,000 |
| Brazil | 16,000 |
| Other Countries | 95,000 |
| World Total | 1,200,000 |
| Country | Reserves |
| India | 963,000 |
| United States | 440,000 |
| Australia | 300,000 |
| Canada | 100,000 |
| South Africa | 35,000 |
| Brazil | 16,000 |
| Malaysia | 4,500 |
| Other Countries | 90,000 |
| World Total | 1,913,000 |
Note: The OECD/NEA report notes that the estimates are subjective, due to the variability in the quality of the data, a lot of which is old and incomplete. Adding to the confusion are subjective claims made by the Australian government that combine the reasonably assured reserves estimates with "inferred" data. This strange combined figure of RAR and "guessed" reserves yields a figure, published by the Australian government, of 489,000 tonnes, however, using the same criteria for Brazil or India would yield reserve figures of between 600,000 and 1,300,000 tonnes for Brazil and between 300,000 and 600,000 tonnes for India. Irrespective of isolated claims by the Australian government, the most credible third-party and multi-lateral reports, those of the OECD/IAEA and the USGS, consistently report high thorium reserves for India while not doing the same for Australia.
Alternate estimates
Another estimate of reasonably assured reserves and estimated additional reserves of thorium comes from OECD/NEA, Nuclear Energy, "Trends in Nuclear Fuel Cycle", Paris, France :| Country | RAR Th | EAR Th |
| India | 519,000 | 21% |
| Australia | 489,000 | 19% |
| USA | 400,000 | 13% |
| Turkey | 344,000 | 11% |
| Venezuela | 302,000 | 10% |
| Brazil | 302,000 | 10% |
| Norway | 132,000 | 4% |
| Egypt | 100,000 | 3% |
| Russia | 75,000 | 2% |
| Greenland | 54,000 | 2% |
| Canada | 44,000 | 2% |
| South Africa | 18,000 | 1% |
| "Other countries" | 33,000 | 2% |
| "World total" | 2,810,000 |
The preceding reserve figures refer to the amount of thorium in high-concentration deposits inventoried so far and estimated to be extractable at current market prices; millions of times more total exist in Earth's 3 tonne crust, around 120 trillion tons of thorium, and lesser but vast quantities of thorium exist at intermediate concentrations. Proved reserves are "a poor indicator of the total future supply of a mineral resource".
Further estimates are provided by the World Nuclear Association as:
| Country | Reserves |
 India |