Engineering & Megastructures - 33 free documentaries about mining & digging.
Start with The Gigantic Goldmine 14,000 Feet In The Air (52 min, Spark), then Extremely Heavy Mining Truck (49 min, Free Documentary). All 33 documentaries here are free to watch from their makers' official uploads. To read deeper, the top-rated book on mining & digging is Deep Down Dark by Héctor Tobar.