Naturally compressed peat
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What is lignite and how is it made?
Lignite is simply a kind of coal, usually a brownish-black one. Hence, it is also called brown coal. However, it may also occur in other colored forms like yellow and even black, which is rarely found. So, let鈥檚 define lignite. It is soft brownish coal formed from naturally compressed peat at shallow areas having temperatures lower than 100C.
What is lignite (brown coal)?
A. Di Gianfrancesco, in Materials for Ultra-Supercritical and Advanced Ultra-Supercritical Power Plants, 2017 Lignite, often referred to as brown coal, is a soft brown combustible sedimentary rock that is formed from naturally compressed peat. It is considered the lowest rank of coal due to its relatively low heat content.
How many tons of lignite are mined each year?
Approximately 30 million tons of lignite is mined regionally each year. Our lignite reserves contain an 800-year supply of economically recoverable coal at current usage. This coal is primarily used to generate electricity at seven coal-based power plants. However, there are other uses for lignite as well.
How was lignite deposited in the Rocky Mountains?
Lignite reserves in this region were deposited by tons and tons of dead and decaying plants in a swampy atmosphere 50-to-70 million years ago, and the overburden above the coal was deposited there by runoff from the west as the Rocky Mountains formed.