With the endless attempt to refine the foundry, I stumbled across this video posted by Mr Tinker on youtube. He uses waste oil, both vegetable and motor, to fire his furnace. Needless to say, I was impressed and ordered the required parts from Patriot Supply.
While charcoal works decent as a fuel, it takes too long to sufficiently melt a full crucible. Also, I am finding myself using an entire bag each time I start the furnace. At $9.00 a bag, creating ingots is becoming expensive. So, onto the next step...I'll keep updates with the progress.