Here's what I'm planning to do. I've performed some Math this morning which is why it's likely changed a bit. I'll be able to end at around 120k or so Gold Ore when I reach 99. I'm not sure where I am as of now, but it isn't a problem. So that will get me 80-95 Smithing. Then I'll need 75k or even more Gold Ore in 99. Given the high prices for bars and ore, I'll have 11M profits because I mined it all, so there should be no way I lose money, surely? I'm posting from my iPod and it's impossible to determine the figures.
Hopefully this made a bit of sense. The most important question was the Math portion, since at the time I was snoring haha. I basically calculated the amount of ore from 99 Mining, as well as calculating the amount of money that'd be. Approx. 26M or so.
Then what was the amount of bars I'd need to create for 99 Smithing and the amount of money it would cost. Approx. 27M or about. I'll need about 75,000 gold ore for 95-99, which is equivalent to 16M. When I sell all bars it will come to 28M that's 11-12 million profit.
I think this is correct, but it's a bit confusing when I'm thinking about this in my mind. Plus I was tired because it was about 4:30AM. Additionally, I did not consider the possible amount of difference if I were to offer to sell Gold ore up front rather than use it to train Smithing which probably resulted in more confusion for me.
This is definitely not the most effective method, but it's my method and it's worked for me. It's also quite affordable if you do it right It's a good thing that I make money every trip (not so much but still a profit). Black dragonhide legs and top (I generally use what's left of the prayer points I have to kill Ahrim but if for some reason I've run out of PP when I'm fighting Ah this time. Black dragonhide is helpful.)
Want to learn more about OSRS gold at https://www.rsgoldfast.com