trommel

[trom-uhl]
noun
a rotary, cylindrical or conical screen for sorting ore, coal, gravel, etc., according to size.

Origin:
1875–80, Americanism; < German Trommel drum

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World English Dictionary
trommel (ˈtrɒməl)
 
n
a revolving cylindrical sieve used to screen crushed ore
 
[C19: from German: a drum]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
These finer materials would drop out the bottom of the trommel and then run
  through a sluice box system to extract gold.
After curing, the product is run through a screening process using a trommel.
After the bark is reduced, it is screened with a trommel and then is stored in
  covered bins.
It is then crushed and washed through trommel screens and again crushed with
  roll crushers.
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