A forge should be a large furnace that is used to melt two items together i.e. Tin & Copper together makes Bronze or make Steel. It is built by stacking furnaces is a 2x2x2 block. A Forge would require the addition of multiple new ores and maybe even steel.
Now, I have seen much, much better, including actual uses for these ores. We don't actually need more ores unless they have uses.
I was going to start other topics about ores and their uses.
May I also suggest that you read the red letters in ez's post about the rules.