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1) In ancient Rome, miners took precious metals from ______________.
2) Compared to other extraction methods, ________________________ is quite small.
3) Heavier materials, such as gold, are separated from the soil using a process known as
______________ .
4) When the denser materials settle on the bottom ________________________ examines and
collects it.
5) Panning is unsuitable for large-scale operations due to the restricted
________________________
6) Hobbyists often collect small amounts of gold dust as a ________________________
