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If you dig deep enough, you can mine Tin Ore, Copper Ore, and Coal in all biomes. They come only from breaking Ore-Bearing Stone Blocks. Unlike Cobblestone, the materials drop on the ground rather than appearing in your inventory, so you will have to manually pick them up.
The layers, from shallow to deep:
This screenshot of a horizontal mountain tunnel shows three types of underground rock: Cliff Rock in the foreground, a narrow band of Gray Rock next, and then Ore-Bearing Stone Block at the back. The tunnel floor is lighter in the layer of Gray Rock.
- Mining is fastest with the largest block size selected. Use with the mouse scroll wheel to change sizes.
- Mine in the mountains so you can avoid creating stairs that require jumping.
- You will have to leave your mine less often if you use Stone Age tools.
- Dig a hole in the tunnel wall to hold excess Cobblestone, so you don't have to leave the tunnel as often to clear your inventory.