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GRAVEL WASHING FINES
Gravel washing fines are the ultra-fine particles separated from gravel and sand during wet processing. As extracted aggregates are washed to remove clay, silt, and organic matter, a slurry of suspended fines is generated and typically collected in sedimentation basins or filter presses. Despite their high availability, they remain largely unused and are sent to landfill.
STONE MANUFACTURING DUST
Stone manufacturing dust is produced during the quarrying and mechanical processing of natural stone, such as sawing, grinding, polishing, milling, and finishing operations. These fine particules accumulate on factory floors or are extracted via dry or wet filtration systems. It is typically discarded and, depending on its composition, may require specialized handling.
CONCRETE-REJECT SAND
Concrete-reject sand refers to the granular fraction typically below 1 mm, too fine to meet grading specifications for structural concrete mixtures. Unlike gravel washing fines, it is not slurry-based but results from the screening of sand and gravel deposits, or from overcrushing during aggregate refinement. It is commonly stockpiled as a non-spec filler, or left unused.