fines

(materials) Particles smaller than average in a mixture of particles varying in size. Fine material which passes through a standard screen on which coarser fragments are retained.
(metallurgy) That portion of a metal powder consisting of particles smaller than a specified size.

engineering For ore processing, material sieving < 35 mm.

The name given to smaller stone particles, whose poor thermal conductivity may aid the development of patterned ground in periglacial environments.

1. In plastering, small aggregate which passes through a 74-μm (No. 200) sieve.
2. Soil which passes through a 75-μm (No. 200) sieve.
3. A by-product of the processing of rock; varies in particle size from powder or dust to silt or sand.