because i tried use it has a normal coal and nothing happen, i try to use it as an ore and same... or is just trash?
Coal seems to be scripted to assume its Carbon because of the vein.... - however. It's not setup to act like Carbon in the smelter - Thus. Coal is a very inefficient Fuel source because it can glitch out during running, movement in and out of cell, reload, etc - and the smelter will eat the coal through the walling.
Carbon and Iron must be Inserted in a fairly short time of each other, and immediately following one or the other, in order to make Steel - Which serves no current purpose aside from Bumping your personal capabilities.
Alloy Hammers seem to be a couple levels past their higher metal - So Brass can probably mine Iron/Adelite - Bronze can mine at least that, maybe more, and Steel can mine up to Mithril - And Customers will ask for pretty much anything under the sun.
But the pricing for them is either not configured, or not properly configured - and selling them gets you squat diddly.
Don't auto-load the smelter tray before turning on
Turn on Smelter
Stick a piece of iron ore OR Iron ingot (or iron Dagger head, iron shield boss/wrist/hand) (1 iron worth)
Stick a Piece of carbon in, ensuring it is consumed.
Repeat
Each alloy seems to create two Pieces of Ingots from the source ore - So if you had 1 tin and 1 copper - combining them will be 2 bronze - Which is better than nothing. - Example 2 tin (can't make pick) and 52 copper (Oh boy that's totally useful) = 4 Bronze ( can make pick and mine Tin, Iron, Etc) and 50 copper (Still oh so totally useful Thumbs up, its the best)