I think Brimhaven is much better. If you have your house there, you just teleport to your house and use dueling rings to bank. You don't need to spend time recharging your glories and/or skill necklaces either. The mine isn't that much longer, and there's a summoning obelisk on the way too. The Brimhaven mine also has two more rocks and an ore that spawns on the ground. You also don't lose an inventory space with an apron, so you can use Varrock armor. You could stock up on aprons and drop them each time you enter the guild, though. With 93 mining and Varrock armor 3, I got about 8 trips an hour with my terrorbird, including banking and running. This got me about 320 ores/hr. Overall, I'd say use the Brimhaven mine if you're going to mine gold on members. I might give this method a try though... See what numbers I get..