There is no other way of having 100% success other than wearing a Ring of Forging ( An enchanted Ruby Ring ), this however can only make 250 successful Iron Bars before crumbling to dust. or u can use the spell superheat item that makes every ore work and there is a profit if u sell the bars so that u can buy the nature runes
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You can buy them at the Grand Exchange. Although, it is preffered that you mine iron ore and smelt the ore into bars to raise your mining and smithing level and earn you profit.
Copper, to make Bronze.
In Minecraft,in order to get iron ore out of a mined block of iron you need to smelt the iron ore block in a furnace.
For every steel bar you want to make, you take 1 iron ore and 2 coal ores to a furnace, and use the iron ore on the furnace. Alternately, you can also use the magic spell "Superheat item" (without needing to go to a furnace).
First you have to smelt the Iron Ore into Iron Ingots at a furnace. Then at a crafting table, place an Iron Ingot in each of the nine slots, to make an Iron Block.