McMMO Wiki

Smelting is a child skill of Mining and Repair. The effective Smelting level is the average of the parent skill levels. Smelting was the first child skill.

Abilities []

Fuel Efficiency (Passive)[]

Fuel Efficiency is a passive ability of Smelting that makes the burn time of fuel in a furnace extend. Each level increases the efficiency multiplier by about 0.04. For example, Fuel Efficiency reaches 4x at level 1000.

Second Smelt (Passive)[]

This ability will grant a second piece of whatever you're smelting, whether it be logs to charcoal, iron ore to iron, and even gold ore to gold. The chance of the player doing a second smelt increases 0.1% per Smelting level. At level 1000, you have a 50% chance of getting a second smelt.

Vanilla XP Boost (Passive)[]

The Vanilla XP Boost ability is a passive, like all Smelting abilities are, that grants more experience from a furnace when you smelt materials or ores such as iron ore, oak logs, and sand. The more levels you increase in the smelting skill, the more experience you will gain when you smelt something in a furnace. Like all abilities, Vanilla XP Boost caps at 1000 levels.

Flux Mining (Passive)[]

Smelting a full durability pickaxe in a furnace gives a Flux Pickaxe of that type. For example smelting a diamond pickaxe you would get a diamond pickaxe called 'Flux Pickaxe'. If you are at mining level 250+ you have an approx. 33% chance of instantly smelting ore you break. This action is followed with particle effects.


  • Smelting is the very first child skill in McMMO.
  • Smelting bonuses such as Fuel Efficiency and Second Smelt will not apply unless ores are manually placed into the furnace.
  • If hoppers are used to automatically remove items from furnaces then the Vanilla XP Boost will not apply until a smelted item is manually removed in which any previous XP will all be received at once.
  • NOTE, flux mining is removed for a lot of servers and may not exist. Most servers have a new custom enchant called auto smelt that replaces this except with a 100% autosmelt chance instantly. Enchantments will be either voided or will glitch this pick. It's advised to use a regular pick. It's also advised to use on iron only due to the fact other drops can be multiplied using loot luck.