Assigns a Miner to a Zone type and number
Set the constant combinator to the number of Miners (only works for identical MK values of Miners)
Set the Zone type in each combinator to send the Miner to that.

Originally shared on the public FactorioPrints / Factorio School archive (factorioprints.com · factorio.school). Authorship preserved from the public catalog.
Assigns a Miner to a Zone type and number
Set the constant combinator to the number of Miners (only works for identical MK values of Miners)
Set the Zone type in each combinator to send the Miner to that.