open pit coal mines

Top 10 deep open pit mines Mining Technology

 · Escondida copper mining operation consists of two open pit mines namely Escondida pit and Escondida Norte pit The Escondida pit is long wide and 645m deep The Escondida Norte pit is 525m deep BHP Billiton is the operator of the mine with % interest Rio Tinto holds 30% stake in the mine Escondida is currently the world s

Cerrejon Open pit Coal Mine La Guajira Colombia

The Cerrejon coal mine has a total of 6 open pits in operation The conventional open pit mining methods of drill and blast are used for overburden removal and coal extraction while the shovel and loading operations are carried out with the use of a P H2800 XPC excavator with bucket payload and a fleet of 190t trucks to transfer the

List of open pit mines Wikipedia

Ray mine Asarco copper mine located in Pinal county Arizona Red Dog mine zinc and lead mine in Red Dog Mine Alaska Rio Tinto Borax Mine California s largest open pit mine and the largest borax mine in the world Thompson Creek mine

Open pit mining Wikipedia

Open pit mining also known as open cast or open cut mining and in larger contexts mega mining is a surface mining technique of extracting rock or minerals from the earth from an open air pit sometimes known as a This form of mining differs from extractive methods that require tunnelling into the earth such as long wall pit mines are used when

Open pit mining Global Energy Monitor

 · Open pit mines are typically enlarged until either the coal is exhausted or an increasing ratio of overburden makes further mining uneconomic When this occurs the exhausted mines are sometimes converted to landfills for disposal of solid wastes However some form of water control is usually required to keep the mine pit from becoming a lake

What are the largest remaining coal mines in the US

 · Belle Ayr Mine Another giant coal mine located in Wyoming s Power River Basin Belle Ayr Mine produces nearly 16 million short tonnes of coal per year according to the EIA The facility where operations were first started in 1972 is open pit and it produces low sulfur sub bituminous coal from the Wyodak Anderson seam Freedom Mine

Coal mining Wikipedia

When coal seams are near the surface it may be economical to extract the coal using open cut also referred to as open cast open pit mountaintop removal or strip mining methods Opencast coal mining recovers a greater proportion of the coal deposit than underground methods as more of the coal seams in the strata may be exploited This equipment can

Open Pit Mining an overview ScienceDirect Topics

Open pit mining is the process of extracting rock or minerals from the earth through their removal from an open pit or borrow Figure Open pit mine [16] Surface mining is usually used to develop coal seams and deposits of many other minerals but their feasibilities vary with the nature of the body ore