Assuming he/she has a relatively high mining level

Without competition you could mine a lot; maybe 150? that's about 27 seconds per ore.

 

 

 

EDIT: Thinking about this makes me think my estimate is a bit low...

 

Maybe 1 ore per 15 seconds? You get some 4 second ones and some 20 seconds ones.

 

Probaly 500ish.

150 per hour? thats only abt 5-6 loads of coal, meaning about 10mins for each?

 

 

 

i dont know how fast it is, but i take about 5-6mins for each load of gold.. coal should be faster right? =X

Well at 99 I can 1 hit coal like 8 out of 10 times so mining should take 45 seconds-1 minute max then add in 30 second banking maybe more if your at the guild. So around 2 minutes I would guess for a load and bank trip. 30 loads an hour turns in 840 coal/hr. Thats all an estimate except for the 1 hitting because all I do is mine rune ores at dark beats now :D

An average coal load trip from mining guild to Fally east bank is about 300 coal per hour.

Well, since you can't superheat, your coal mining operation will be rather limited. For all out speed, your best bet is to use the mining guild and bank with dueling rings, and teleport back to the guild with skills necklaces. The best spot in the guild has a grouping of 6 ore which 90% of the time, on a full world with no competition (easier to achieve than you might think on members worlds), I can mine fully and get back to the first rock as it respawns. Given a 30 second respawn rate, you could fill your pack in about 2.5 minutes. With a banking time of 10-15 seconds, it works out to about 600 ore per hour, give or take, if you concentrate on what you are doing.