Mining is the skill that enhances mining. Mining xp is gained by mining server generated blocks so blocks generated by lava in general.
Perks of leveling up mining:
Super breaker: An active ability that adds efficiency 5 on top of whatever efficiency a pickaxe and grants triple drop chance from blocks mined(This drop chanced is based on double drop chance). The ability can be activated by right clicking a pickaxe and mining any stone block, ore, or anything that pickaxes are used to mine like obsidian.
Blast Mining: This is just mining using TNT which is disabled and can't be used to blow up blocks so is useless.