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Gravel /ËÉ¡raevÉl/ ËÉ¡rÃ¦vÉl is composed of unconsolidated rock fragments that have a general particle size range and include size classes from-granule to-boulder sized. Fragments gravel is categorized by The-Udden wentworth scale into granular (gravel 2 to 4 mm or.0 079 to.0 157) in and pebble (gravel 4 to 64 mm or.0 2 to.2 5). in Pay gravel: also known as pay dirt; a nickname for gravel with a high concentration of gold and other precious metals. 2  The metals are recovered through gold panning.
A quarry is a site where a stone or gravel producer extracts a variety of raw materials from the earth. Common types of material extracted in quarrying activities include limestone, granite and sand. The equipment and machinery used in quarrying are large, powerful and productive. The first process of opening a quarry is to remove the material between the surface and the minerals or materials that you want to extract.