| Notes |
The Mining sector of the 1997 Economic Census covers all mining establishments of companies with one or
more paid employees. Mining is defined as the extraction of naturally occurring mineral solids, such as coal
and ores; liquid minerals, such as petroleum; and gases, such as natural gas. The term mining is used in the
broad sense to include quarrying, well operations, beneficiating (e.g., crushing, screening, washing, and
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