I would probably do the gold bar method with gauntlets (currently doing it as well) and you could then use the bars for crafting later on. Makes it alot faster doing it at neizhot (that fremminick city) if you could.
Right now I believe I have spent about 70m so far and still need more but I bought all the gold ore when free trade came out and it was pretty cheap back then.
Or if you have money to just throw around platebodies is pretty fast.
1. I think fastest way is Superheating gold ore with gloves, but it's expensive when you getting 99 lvl. a)
Gold*Ore: 247gp
Nature*Rune: 147gp
Gold Bar: 134gp
Waste: 260gp/bar
It's cheaper when u mine ores by urself in Living Rock Caverns. b)
Nature Rune: 147gp
Gold Bar: 134gp
Waste: 13gp/bar
2. Medium way is that new update in Falador.
Making Miner's stuff by using iron ores at tier 1.
It's 1exp - 1,7gp. It's cheap but it takes alot of time. [10 sec/101-111exp]
Iron Ore: 171gp 129060 items from lvl 1 to lvl 99 at 101exp [Cost: 22 069 260gp] - AFK - 4:30min update TIME: Making: 1290600s | 21510m | 358,5h | ~14,9d Restock:4780[~15sec/restock] | 71700s | 1195m | 19h | ~0,8d Summary:1362300s | 22705m | 378,5h | ~15,6d