However since asbestos is only dangerous when inhaled subsurface deposits pose little risk When these deposits are mined airborne concentrations increase greatly In Libby Montana mining and processing of asbestos contaminated talc and vermiculite increased airborne asbestos concentrations from < in 1847 to fibres/cm 3 in 1995
·Most of the asbestos mining operations are of the open pit type using bench drilling techniques The fiber extraction milling process must be chosen so as to optimize recovery of the fibers in the ore while minimizing reduction of fiber length Dry milling operations are the most widely used
·That s in part because the mining process further increases the rock s reactivity by pulverizing it into a fine powder allowing a mineralization process that may take 1 million years in a
·The mining process included breaking apart asbestos containing ore with hammers and chisels creating large amounts of asbestos dust in confined areas Without proper protective equipment asbestos miners could easily inhale or ingest asbestos
·Asbestos miners were directly exposed to raw asbestos as they mined and transported the ore for processing Miners were also exposed to asbestos products in mining machinery and equipment such as brake linings gaskets and heat panels Asbestos mining ended in the in 2002 but it continues in certain countries including Russia
·The steps of asbestos fibre processing are key to making the material useful for industry Yet we must handle friable asbestos carefully because it can be Asbestos Mining and Production We start our adventure with asbestos mining and making by learning the methods and tools used at the start
·Asbestos has been produced in South Africa since the 1930 s and up until 1981 the operations ranged from large scale foreign owned mine and plant establishments to pick and shovel adits and trenches on privately owned farms Hart 1988 The global ban on asbestos mining since the 1990 s however has left a plethora of derelict mining and processing sites in
·Mining Industry What is asbestos Asbestos is the generic term for six fibrous mineral silicates chrysotile crocidolite amosite tremo lite asbestos anthophylite asbestos and actinolite asbestos How could I be exposed to asbestos » The rock or ore being processed at the mine may contain asbestos or » commercial products at the mine
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