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  2. Crushed stone - Wikipedia

    en.wikipedia.org/wiki/Crushed_stone

    These costs vary depending on geographic location, the nature of the deposit, and the number and type of products produced. 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.

  3. Construction aggregate - Wikipedia

    en.wikipedia.org/wiki/Construction_aggregate

    In Europe, sizing ranges are specified as d/D, where the d shows the smallest and D shows the largest square mesh grating that the particles can pass. Application-specific preferred sizings are covered in European Standard EN 13043 for road construction, EN 13383 for larger armour stone, EN 12620 for concrete aggregate, EN 13242 for base layers of road construction, and EN 13450 for railway ...

  4. Gravel - Wikipedia

    en.wikipedia.org/wiki/Gravel

    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.

  5. Permanente Quarry - Wikipedia

    en.wikipedia.org/wiki/Permanente_Quarry

    Southern Pacific Railroad wanted $.27/ton to move the material to the construction site. The gravel was 1 + 1 ⁄ 2 miles from the Southern Pacific railhead which required the construction of a conveyor belt between the pit and the railroad. At the suggestion of one of Kaiser's engineers, a 9.6-mile conveyor belt system was built, completely ...

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  7. Mining - Wikipedia

    en.wikipedia.org/wiki/Mining

    For example, 99 tons of waste is generated per ton of copper, with even higher ratios in gold mining – because only 5.3 g of gold is extracted per ton of ore, a ton of gold produces 200,000 tons of tailings. [72] (As time goes on and richer deposits are exhausted – and technology improves – this number is going down to .5 g and less.)

  8. Recycling - Wikipedia

    en.wikipedia.org/wiki/Recycling

    Additionally, a United States Environmental Protection Agency (EPA) study that tracked the price of clear glass from 15 July to 2 August 1991, found that the average cost per ton ranged from $40 to $60 [140] while a USGS report shows that the cost per ton of raw silica sand from years 1993 to 1997 fell between $17.33 and $18.10.

  9. Oldcastle Materials - Wikipedia

    en.wikipedia.org/wiki/Oldcastle_Materials

    Oldcastle Materials Inc. is a supplier of asphalt, concrete, and other building materials, and also offers construction and paving services. The Atlanta-based company is a subsidiary of CRH plc, a publicly traded international group of diversified building materials businesses, [2] [3] and has approximately 18,000 employees at 1,200 locations, as of March 2018.

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