How can self-replicating machines collect and sort raw material?

But I would like to consider other solutions for separation of raw materials that can be automated but are less "extreme" and closer to current technologies.

My machines are supposed to mine mostly asteroids (0g no atmosphere), moons and moonlets(low g, no atmosphere).

EDIT: As stated I am thinking at clanking replicators, not nanobot. If you want an example of material composition to use then moon regolith composition is ok: Oxygen (40%), Silicon (20%), Iron (10%), Calcium (6%), Aluminum (5%) and Magnesium (5%)

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How can self-replicating machines collect and sort raw material?

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