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Mining calibrations are optional on this server and will stay at 100%. The only time you may need to use them is when Mining Units are deployed from a blueprint. When deploying from a blueprint, you can either calibrate the mining unit one time or alternatively pick up and re-place each mining unit to apply the 100% calibration.
Optionally, you can use mining calibrations to spawn ore underneath the mining unit. You then use the Harvest Tool to mine the ore that has spawned. See below a video showing this: