I'm posting this again, not for rep, but because apparently people liked it last time and the pictures went away, so here goes:
This isn't much, but it can get you about 8 stacks of ten each run(depending on miner activity, naturally)
Green is the Start
Black is the Regular route
Red means to go inside
Yellow means follow the river.
Blue is optional, I do it on occasion, you can pick up a little more ore if you are about to have one more stack but ran out of veins.
The tower right to the left of Eastvale has a very quick spawn rate of copper veins. If you want to get a little more, double back, and it should have at least another copper vein waiting for you to attack it with your mining pick.
And here is the horde side, pretty simple.(I apologize for the oversized image)
I'd post the Tauren one, but it just goes around the outer perimeter of the map.
This should take about 15 minutes with your mount, and about 20-25 without. Its pretty basic, if there are any questions, go ahead and ask.