How much coal is in the United States?
The amount of coal that exists in the United States is difficult to estimate because it is buried underground. The most comprehensive national assessment of U.S. coal resources was published by the U.S. Geological Survey (USGS) in 1975, which indicated that as of January 1, 1974, coal resources in the United States totaled 4 trillion short tons. Although more recent regional assessments of U.S. coal resources have been conducted by the USGS, a new national-level assessment of U.S. coal resources has not been conducted.
The U.S. Energy Information Administration (EIA) publishes three measures of how much coal is left in the United States, which are based on various degrees of geologic certainty and on the economic feasibility of mining the coal.
EIA's estimates for the amount of coal reserves as of January 1, 2018, by type of reserve
- Demonstrated Reserve Base (DRB) is the sum of coal in both measured and indicated resource categories of reliability. The DRB represents 100% of the in-place coal that could be mined commercially at a given time. EIA estimates the DRB at about 475 billion short tons, of which about 69% is underground mineable coal.
- Estimated recoverable reserves include only the coal that can be mined with today's mining technology after considering accessibility constraints and recovery factors. EIA estimates U.S. recoverable coal reserves at about 253 billion short tons, of which about 58% is underground mineable coal.
- Recoverable reserves at producing mines are the amount of recoverable reserves that coal mining companies report to EIA for their U.S. coal mines that produced more than 25,000 short tons of coal in a year. EIA estimates these reserves at about 16 billion short tons of recoverable reserves, of which 68% is surface mineable coal.
Based on U.S. coal production in 2017 of about 0.78 billion short tons, the recoverable coal reserves would last about 325 years, and recoverable reserves at producing mines would last about 26 years. The actual number of years that those reserves will last depends on changes in production and reserves estimates.
Six states had 77% of the demonstrated reserve base (DRB) of coal as of January 1, 2018:
- West Virginia—6%
Twenty five other states had the remaining 23% of the DRB.
What is the amount of world coal reserves?
As of December 31, 2015, estimates of total world proved recoverable reserves of coal were about 1,133 billion short tons (or 1.1 trillion short tons).
- Five countries had about 74% of the world's coal reserves. The top five countries and their share of world proved coal reserves:
- United States22%
Last updated: November 15, 2018