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Crushed stone has one of the lowest average by weight values of all mineral commodities. The average unit price increased from US$1.58 per metric ton, f.o.b. plant, in 1970 to US$4.39 in 1990. However, the unit price in constant 1982 dollars fluctuated between US$3.48 and US$3.91 per metric ton for the same period.
The Powder River Basin mines supply approximately 40% of the coal that fuels those stations (mainly east of the Rocky Mountains) for generating electricity. [11] The mines work in areas where the stripping ratio is between 1:1 (i.e. one ton of rock for one ton of coal) and 3:1. [12] As the mines expand the stripping ratio will increase.
The exact phosphate content of the phosphate rock mined in 2015 is not available, but in the latest five-year period for which ore grades are available, 2009-2013, the grade of US phosphate rock varied from 28.5 to 29.0 percent P 2 O 5. As of 2016, remaining reserves of phosphate rock in the United States totaled 1.1 billion metric tons. [1]
River gravel is a name given to gravel composed of small pieces of rounded stone of various colors, usually no larger than a large coin. [1] It is named for the effect of many years of rounding of the edges of the stones due to a flow of water over it, as often takes place in a river . [ 2 ]
The state with the lowest per capita energy use is Rhode Island, at 161 million BTU per year, and the highest is Louisiana, at 908 million BTU per year. Energy use and prices often have an inverse relationship; Hawaii uses some of the least energy per capita but pays the highest price on average, while Louisiana pays the least on average. [75]
As of 2020, coking coal in the U.S. sold for about $127/short ton, compared with $50.05/short ton for bituminous coal generally. The cost of coking coal is about 3.5 times as high as the cost of coal used for electrical power (which includes lower ranks of coal, such sub-bituminous coal and lignite , as well as noncoking bituminous coal.) [ 20 ]