create a normal fire with firewood and place the crucible in there like a cookingpot
add the nuggets (not chunks)(not iron/nickel) into the cruicible; here you also mix the metals for alloying
replace the firewood with a fuelsource thats hot enough to melt the nuggets: mainly charcoal/coal
ignite and wait, the crucible will be hot and need tongs to work with
pour the metal in the cooked clayform of your desire ~
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Dekoser's post in How tf do I make a smelting fire was marked as the answer