I found that when it comes to the drill, size matters. Replacing my drill head with a larger version allows me to mine larger areas.
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Upgrade slot
Drill Head
The Big Drill is a Steam Drill upgrade from Flaxbeard's Steam Power. When installed, it will allow the player to mine in 3x3 chunks, at the cost of a mining speed decrease. It can be installed in the drill's head slot in the Engineering Table.