You don't make a profit making gold bars, it's the best and fastest smithing exp in the game tho (with gauntlets).
You can make 800k hr, from making steel bars, 1m for mith, 1.2m for runite - adamant is somewhere around 600-800k.
get ice gloves (so u dont need water to cool down the bars), and gold gauntlets from the family feud quest.
Goto your minigame teleports, select blast furnace, go inside the building, down the stairs.
Put money in the coffer placed on the box next to the bank, withdraw ores, put ores / coal on the feeding belt, wait 2-3 seconds, get bars + exp from a bar mould next to the feeding belt.
tldr; just use ur minigame tp, goto blast furnace and start the bot (its free).