The Seers village coal mine would be the best place to mine seeing as you can put all collected coal in the nearby coal trucks ( holds 400 coal at a time ), then you can offload them near seers bank, but the number one best place if you have the level is the mining guild at Falador, unbelievably close to the bank, but you need level 60 mining to enter.
in the mine
Hobgoblin Mine is the best place for non-members - 8 rock and Abandoned Mine sis the best place for members - 13 rocks
The best place to mine silver ore is Al kharid mine as this requires no quests.
Any place where there are valuable minerals.
Iron Springs in southwestern Utah
I have some old stock and would like to know where to look for the name changes as it went from one company to a nother
If you have 66 magic than the magic guild is the best place
you should look it up on jobs.com that's how I got mine.
deadmines...
Living Rock Caverns
barb village
For non-members, the ONLY place to mine it is in the wilderness level 40 or so, a rather dangerous place to go (mainly due to the revenants).