Русско-англо-русский юридический словарь

An employment record book is an official personal document recording the employment status of its owner over time. Many European countries issue such documents. The first employment record books are said to have been issued in German Reich in 1892 in the mining industry. (Wikipedia)

In the mining industry or extractive metallurgy, beneficiation is any process that improves (benefits) the economic value of the ore by removing the gangue minerals, which results in a higher grade product (concentrate) and a waste stream (tailings). (Wikipedia)

The mining industry is involved with the extraction of precious minerals and other geological materials. (Corporate Finance Institute)