SC2Mapster

What's the difference?

Smelt:
smelted past participle; smelts 3rd person singular present; smelting present participle; smelted past tense

1. Extract (metal) from its ore by a process involving heating and melting
   "tin smelting"
   
2. Extract a metal from (ore) in this way

Melt:
melted past participle; melted past tense; melting present participle; melts 3rd person singular present

1. Become liquefied by heat
   "place under the broiler until the cheese has melted"
   "the icebergs were melting away"
   
2. Change (something) to a liquid condition by heating it
   " the hot metal melted the wax"
   "asparagus with melted butter"
   
3. Melt something, esp. a metal article, so that the material it is made of can be used again
   "beautiful objects are being melted down and sold for scrap"

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There you go :)

@TheAlmaity: Go

I forgot about google. Damn

It's a nice example as to how Dutch lacks words. We just say 'smelt' for anything that has to do with the object.