Charge in a BatBox/MFE or with a BatPack. Batteries: 
RE-Battery 10k, 
Energy Crystal 1M, 
Lapotron Crystal 10M.
Mining Drill 50 EU/block, 
Diamond Drill 80, 
Iridium Drill 800 (sneak+right-click: Fortune III ↔ Silk Touch).
Crafting Table3 × 3
1 × Mining Drill
Crafting Table3 × 3
1 × Diamond Drill
Crafting Table3 × 3
1 × Iridium DrillThe 
Chainsaw also shears sheep and leaves. 
Nano Saber: right-click on = 20 damage.
Mining Laser: 8 modes (sneak+right-click), e.g. 3x3 tunnel, super-heat (smelts), explosive.
Without power: bronze tools (iron tier, a bit slower, more durable) and bronze armor; 6 bronze = 
Wrench.
Crafting Table3 × 3
1 × Chainsaw
Crafting Table3 × 3
1 × Nano Saber
Crafting Table3 × 3
1 × Mining Laser
Crafting Table3 × 3
1 × Bronze Pickaxe
Crafting Table3 × 3
1 × Bronze ChestplateRequired materials
Bronze Ingot8 ×