Mines

Mines are structures that allow you to extract from ore veins without destroying the ore, effectively rendering it infinite.

Mine structures include:
 * Trade Mines
 * Jade Mine
 * Coal Mine
 * Diamond Mine
 * Gold Mine
 * Gunpowder Mine
 * Iron Mine
 * Lapis Mine
 * Marine Mine
 * Obsidian Mine
 * Quartz Mine
 * Redstone Mine