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  2. Crushed stone - Wikipedia

    en.wikipedia.org/wiki/Crushed_stone

    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.

  3. Placer mining - Wikipedia

    en.wikipedia.org/wiki/Placer_mining

    The amount of gravel that can be processed using the Mexican dry wash technique varies from 1 1/2 to 4 cubic yards per day, and can be processed at a maximum efficiency of 80%. [18] Another form of dry washing is "winnowing". This method was most commonly used by Spanish miners in America, and only requires a blanket and a box with a screen on ...

  4. 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 ...

  5. Gravel - Wikipedia

    en.wikipedia.org/wiki/Gravel

    Gravel is classified by particle size range and includes size classes from granule- to boulder-sized fragments. In the Udden-Wentworth scale gravel is categorized into granular gravel (2–4 mm or 0.079–0.157 in) and pebble gravel (4–64 mm or 0.2–2.5 in). ISO 14688 grades gravels as fine, medium, and coarse, with ranges 2–6.3 mm (0.079 ...

  6. Track ballast - Wikipedia

    en.wikipedia.org/wiki/Track_ballast

    A variety of materials have been used as track ballast, including crushed stone, washed gravel, bank run (unwashed) gravel, torpedo gravel (a mixture of coarse sand and small gravel), slag, chats, coal cinders, sand, [3] and burnt clay. [4] The term "ballast" comes from a nautical term for the stones used to stabilize a ship. [1]

  7. Coal preparation plant - Wikipedia

    en.wikipedia.org/wiki/Coal_preparation_plant

    A coal preparation plant (CPP; known as a coal handling and preparation plant (CHPP), coal handling plant, prep plant, tipple or wash plant) is a facility that washes coal of soil and rock, crushes it into graded sized chunks (sorting), stockpiles grades preparing it for transport to market, and more often than not, also loads coal into rail ...

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