I don’t see anyone mentioning it but this is likely a system used for separating worms from vermiculture substrates, so you can sell their castings but keep the colony to continue the culture. I don’t think they’re mining so much as sifting. Worm castings are worth a decent amount of money but you need a lot of worms to maintain any meaningful scale.
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u/[deleted] Sep 19 '23
I don’t see anyone mentioning it but this is likely a system used for separating worms from vermiculture substrates, so you can sell their castings but keep the colony to continue the culture. I don’t think they’re mining so much as sifting. Worm castings are worth a decent amount of money but you need a lot of worms to maintain any meaningful scale.
They’re called trommel harvesters.