Here you will find explanations as to how to maximize your trips into a mine. Remember, essences weigh 1 EMU, ores and minerals from 2 to 4 EMU. With the right planning you can mix on site and walk out having harvested and mixed more than had you merely mined the ore or mineral.
You shouldn't even be seeing this. Bizzeebeever told me to add this here so that we can get responsiveness working for all screens.