Cavern Mines can be found via Mountain Mines. You should explore the Mountain Mine a lot to find the entrance of Cavern Mine. Entrance portal is shown in picture. It has some exclusive blocks and resources that one can't mine anywhere else.
Blocks and Resources
|Cave Wall||Cave Lava Cracks||Stone Lava Cracks|
|Deep Cave Wall||Water||Oil|
|Stalagmite||Stalagmite Bunch||Mega Stalagmite|
|Glow Shroom||Purple Crystal||Jagged Rocks|
- You will need light sources (Torch or Candle) to see where you are.
- In some really rare cases, you may find water / oil.
- Purple Crystals and Glow Shrooms are light sources.