Placer mining is a special opencut method for exploiting deposits of sand or gravel .. There is no one inclusive definition of "mining" for federal income tax purposes. .. encompasses prospecting, which does not necessarily require a state filing .. ALLUVIAL Adjective used to identify particular types of, or minerals found.
alluvial gold: gold found in alluvium, ie riverine or estuarine deposits of sand or .. driven onto the leads (see hard rock mining definition). ditch: see race. .. does not become a tunnel until it is driven through a rock mass,. e.g. a ridge or an ore jiggers: vibratory machines for concentrating coarse sand, commonly used in.
In geology, a placer deposit or placer is an accumulation of valuable minerals formed by gravity separation from a specific source rock during sedimentary processes. The name is from the Spanish word placer, meaning "alluvial sand". Placer mining is an important source of gold, and was the main technique.
Placer mining /ˈplæsər/ is the mining of stream bed deposits for minerals. This may be done by . The containing material in an alluvial placer mine may be too loose to safely mine by . The word placer derives from the Spanish placer, meaning shoal or alluvial/sand deposit, from Catalan placer (shoal), from plassa (place).