Here is a passage about how to make money with smithing in Runescape.I find it on other website and bring it here,may help someone.
Smithing can be a very tedious skill, but with a lot of effort, you can make millions (Even in freeplay!). The basic idea of money making with Smithing is to take any ores you bought or Mined, and Smith them into bars which can be sold like that, or made into something else.There are three or more ways to make money from Smithing, and they both require a lot of steel bars. The Freeplay Smithing method requires a higher level than the Members method, but the Freeplay version can also be used by Members to make money.
1)Steel Platebodies
This method will require 48 Smithing to smith the Steel Platebodies and 55 Magic to High Alch them. If you buy your ores you will need around 320,000-400,000gp per 2,000 Coal Ore. Coal ore sells 160-200gp each, or you could always Mine the ore although it would take quite a while. With 1,000 Iron Ore (suggested you mine this but it could only cost 100-120gp each), you will end up with 1,000 Steel Bars when you finished Smelting the ores. It's recommended you have a random object such as a set of logs to make withdrawing ores easier. Withdraw 9 Iron Ore and then 18 Coal Ore and Smelt them all. Members have the option of using the Keldagrim Blast Furnace, which only requires half the coal ores.
2)Cannonballs
Another method of moneymaking with Smithing is to make cannonballs. This requires a cannonball mold and the completion of the Dwarf Cannon quest. Withdraw the mold and 27 Steel bars. Take them to any furnace and use the Steel Bar on the furnace. You will make a total of 108 cannonballs each inventory. This results in around 200 gp profit per steel bar.
3)Iron Knives
You can also make money by smithing Iron Knifes. This method requires Smithing level 22, Iron Ores (can be mined at level 15, or bought from other players) and a Ring of Forging (can be made with Crafting level 34 and Magic level 49 or bought).
First of all, buy or obtain Iron Ores and a Ring of Forging. Smelt the Iron Ores into Iron Bars while wielding a Ring of Forging. Then smith the Iron Bars into Iron Knifes. This way you can make a profit of 68gp per bar even when you buy all the materials. When you get all the materials yourself you can make a profit of 175gp per bar.
After walkthrough this passage,you will know how to be rich by mining.If you need Runescape Gold or Runescape Powerleveling,Thepowerlevel will offer you.
