What are the difference between coarse aggregates coming from processing plants and coarse aggregates obtain?

Question

What are the difference between coarse aggregates coming from processing plants and coarse aggregates obtained under water on rivers?

Answer 1

I agree with the above answerer.

When I order a certain size aggregate from the local landscape materials company, I expect a uniform size, color, set of shapes, etc. If I order the same thing a year later (to add more landscaping), I can expect it to match very closely to what I had a year ago.

If it was river rock dredgings, I would have to accept whatever they dredged up at the time, which may or may not be the same as before.

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Answer 2

Coarse aggregates coming from a processing plant is likely to be more uniform in terms of size. This is because they are prepared through a particular sieve however, the obtained coarse aggregate are most likely to be mixture of various sizes.