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NAICS 21 NAICS 21 is the category within the North American Industry Classification System which is composed of establishments that extract naturally occurring mineral solids(i.e. as metals, coal and other industrial minerals), liquid minerals (i.e. crude petroleum) and gases (i.e. natural gas).〔(【引用サイトリンク】 url=http://www.census.gov/cgi-bin/sssd/naics/naicsrch?code=21&search=2007%20NAICS%20Search )〕 ==Definition of mining== NAICS 21 uses the term "mining" to include quarrying, well operations, beneficiating and other mineral preparation customarily performed at the mine sites, or as a part of mining activity and distinguishes two basic activities:
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「NAICS 21」の詳細全文を読む
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