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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.
Gravel (largest fragment in this photo is about 40 mm (1.6 in)) Gravel (/ ˈ ɡ r æ v əl /) is a loose aggregation of rock fragments.Gravel occurs naturally on Earth as a result of sedimentary and erosive geological processes; it is also produced in large quantities commercially as crushed stone.
Traditionally, it includes natural materials such as sand, gravel, crushed stone. As with other types of aggregates, it is a component of composite materials, particularly concrete and asphalt. Aggregates are the most mined materials in the world, [1] [2] being a significant part of 6 billion tons of concrete produced per year. [3]
In 2023, the aggregate industry in the United States mined and sold 1.5 billion tons of crushed stone valued at more than $24 billion and 920 million tons of construction sand and gravel valued at $11 billion. [1] [2] There are thousands of aggregate-producing companies in the US, operating in each of the 50 states, and employing 105,000 people.
A wide range of hard landscape materials can be used, such as brick, gravel, rock or stone, concrete, timber, bitumen, glass, and metals. Common gravel types include pea gravel and crushed granite gravel. [1] 'Hard landscape' can also describe outdoor furniture and other landscape products.
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