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Big Bertha Stories Bobbie Ann Mason Donald comes home occasionally and unannounced to see his family He seemed to adjust after the Vietnam War but then he lost his job and deteriorated He tells his son Rodney tall tales of Big Bertha a huge stripmining machine The stories start out light but always turn dark It Norman Mailer

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Mining Wikipedia

20191028 ensp 0183 enspMining is the extraction of valuable minerals or other geological materials from the Earth usually from an ore body lode vein seam reef or placer deposit These deposits form a mineralized package that is of economic interest to the miner Ores recovered by mining include metals coal oil shale gemstones limestone chalk dimension stone rock salt potash gravel and clay

MINING COM Answering Mining s Big Questions

Answering Mining s Big Questions New Benchmark lithium industry assessment has some good news for besieged hard rock miners

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Safety and Health Topics Toxic Metals Occupational exposure most often occurs in mining extraction and in the processing of alloy metals containing beryllium

Surface mining Wikipedia

20191013 ensp 0183 enspSurface mining including strip mining openpit mining and mountaintop removal mining is a broad egory of mining in which soil and rock overlying the mineral deposit the overburden are removed in contrast to underground mining in which the overlying rock is left in place and the mineral is removed through shafts or tunnels

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Bucketwheel excavator Wikipedia

20191030 ensp 0183 enspA bucketwheel excavator BWE is a heavy equipment machine used in surface mining The primary function of BWEs is to act as a continuous digging machine in largescale openpit mining operations removing thousands of tons of overburden a day What sets BWEs apart from other largescale mining equipment such as bucket chain excavators is

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20081115 ensp 0183 enspAs an engineer I am utterly fascinated by these photos but there are some areas where one would wish that more detail was shown This appears to be an excavation processing machine and the stuff being excavated was surely an ore body or a coal seam

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2017531 ensp 0183 enspSurface mining existed as well but it wasn t until the big shovels came on in the 1940s and 1950s that strip mining began to take a larger portion of the state s annual coal production Generally it is economic to strip mine when there is a 20 1 ratio of overburdentocoal seam meaning for example that a threefoot coal seam can be

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The world s biggest mining dump Company Belaz in October 2013 under an order from a Russian mining machine operating weight of

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Dragline excavator Wikipedia

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Top 7 biggest mining excavators in the world

20191024 ensp 0183 enspMassive machines This is the least we can say about the world s heftiest mining excavators out there Some of these beasts can weigh more than 800 tonnes especially the models we have to show to you today Meet the top seven biggest hydraulic mining excavators on the planet and once you are done go view some of our small gold mining equipment including a cone crusher review amp a jaw

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Miningtechnology profiles the 10 biggest operating coal mines in the world based on of the Russian Federation is the mining operation

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Gold mining will have a big impact on political stability in the region La miner 237a de oro tendr 225 un gran impacto en la estabilidad pol 237tica de la regi 243n land mining n noun Refers to person place thing quality etc military placing explosives underground

The Unique Huge Coal Mining Complex English Russia

2015114 ensp 0183 enspThe Unique Huge Coal Mining Complex Nazarovskiy openpit coal mine is situated in the Krasnoyarsk region in the 1970s it became a ground to test the innovative coal mining technologies This is where a unique rotor complex SRs K 4000 by TARKAF is used it is the biggest and the most efficient stripping complex in Russia

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