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Spelunkery adds hazards alongside its ores, and two you will meet early are the 
Dust Bunny mob and the 
Bramble of Tangle Roots. Neither is a boss fight, but both can ruin a mining trip if you are not ready.
Dust Bunnies
Dust Bunnies are the mod's signature mob. They are small and easy to overlook in a dark tunnel, which is exactly the problem — you will often notice them only when they are already on you. The practical counter is light: keep your tunnels lit with glowsticks so you see them coming, and clear them out before they cluster. Do not let a group build up in a side branch you plan to mine later.
Bramble of Tangle Roots
This block grows underground and tangles up your movement. If you are trying to run from something or navigate a tight shaft, hitting a bramble slows you down badly.
1. Carry a hoe or axe to clear brambles quickly.
2. Clear them along your main path, not just where you are currently standing.
3. Do not build your base entrance through a bramble patch.
Treat both as maintenance tasks: light your caves, clear your routes, and neither will catch you off guard.