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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.
Gravel is a common material choice for an exterior driveway and parking apron. You will find that the cost to install average gravel driveway depends upon material and finish grade, surface area and material volume, preparation and special needs, and the labor rate. In the following table the Labor Cost figure is what the able and prepared DIY persons should expect to save by performing the corresponding tasks.