The upper big branch mine disaster case study Video
Upper Big Branch - Never Again the upper big branch mine disaster case studyMining is the extraction of valuable minerals or other geological materials from the Earth, usually from an ore body, lodeveinseamreefor placer deposit. These deposits form a mineralized commodity that is of economic interest to the miner. Ores recovered by mining include metalscoaloil shalegemstoneslimestonechalkdimension stonerock saltpotashgraveland clay.
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Mining is required to obtain any material that cannot be grown through agricultural processes, or feasibly created artificially in a laboratory or factory. Mining in a wider sense includes extraction of any non-renewable resource such as petroleum, natural gas, or even water. Modern mining processes involve prospecting for ore bodies, analysis of the profit potential of a proposed mine, extraction of the desired materials, and final reclamation of the land after the mine is closed. Mining operations usually create a negative environmental impact, both during the mining activity and after the mine has closed.
Hence, most of the world's nations have passed regulations to decrease the impact. Work safety has long been a concern as well, and modern practices have significantly improved safety in mines. Since the beginning of civilization, people have used stoneceramics and, later, metals found close to the Earth 's surface. These were used to make early tools and weapons ; for example, high quality flint found in northern Francesouthern England and Poland was used to create flint tools. The mines at Grimes Graves and Krzemionki are especially famous, and like most other flint mines, are Neolithic the upper big branch mine disaster case study origin c. Other hard rocks mined or collected for axes included the greenstone of the Langdale axe industry based in the English Lake District.
At this site Paleolithic check this out mined hematite to make the red pigment ochre. Ancient Egyptians mined malachite at Maadi. Later, between and BC, large building projects required expeditions abroad to the area of Wadi Maghareh in order to secure minerals and other resources not available in Egypt itself.
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Mining in Egypt occurred in the earliest dynasties. The gold mines of Nubia were among the largest and most extensive of any in Ancient Egypt. These mines are described by the Greek author Diodorus Siculuswho mentions fire-setting as disastet method used to break down the hard rock holding the gold. One of the complexes is shown in one of the earliest known maps. The miners crushed the ore and ground it to a fine powder before washing the powder for the gold dust. Mining in Europe has a very long history. Examples include the silver mines of Lauriumwhich helped support the Greek city state of Athens. Although they had over 20, slaves working them, their technology was essentially identical to their Bronze Age predecessors.
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However, it was the Romans who developed large scale mining methods, especially the use of large volumes of water brought to the minehead by numerous aqueducts. The water was used for a variety of purposes, including removing overburden and rock debris, called hydraulic miningas well as washing comminutedor crushed, ores and driving simple machinery.
The Romans used hydraulic mining methods on a large scale to prospect for the veins of ore, especially a now-obsolete form of mining known as hushing. They built numerous aqueducts to supply water to the minehead. There, the water stored in large reservoirs and tanks. When a full tank was opened, the flood of water sluiced away the overburden to expose the bedrock underneath and any gold veins. The rock was then worked upon by fire-setting to heat the rock, which would be quenched with a stream of water. The resulting thermal shock cracked the rock, enabling it to be removed by further streams of water from the overhead tanks.
The Roman miners used similar methods to work cassiterite deposits in Cornwall and lead ore in the Pennines. The methods had been developed by the Romans in Spain in 25 AD to exploit large alluvial gold deposits, the largest site being at Las Medulaswhere stidy long aqueducts tapped local rivers and sluiced the deposits.
The Romans also exploited the silver present in the argentiferous galena in the mines of Cartagena Cartago NovaLinares CastuloPlasenzuela and Azuagaamong many others. In Great Britain the natives had mined minerals for millennia[12] but after the Roman conquestthe scale of the operations increased dramatically, as the Romans needed Britannia 's resources, especially goldsilvertinand lead. Roman read more were not limited to surface mining. They followed the ore veins underground once opencast mining was no longer feasible. At Dolaucothi they stoped acse the veins and drove adits through bare rock to drain the stopes.
The same adits were also used to ventilate the workings, especially important when fire-setting was used.]
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