MATERIALS (figure 2): - wooden frame - sieve with holes of about 1 mm (available in a hardware store) - Formica sheets - rectangular bowl/container large enough to fit the frame
Mineral processing: Mineral processing, art of treating crude ores and mineral products in order to separate the valuable minerals from the waste rock, or gangue. It is the first process that most ores undergo after mining in order to provide a more concentrated material for the procedures of extractive metallurgy.
353 . Appendix 1 . The only master of this kind of observation hitherto has been Marcel Griaule (d. 1956) but he left an impressive cohort of disciples.
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