When you call Bobby the owner he will determine what you are looking for, the prices start at 300 and can go up into the thousands if you would like. This enables you and one other to dig the vein additional people helping are 25 each. Hope this helps. Twin Creeks Crystal's mine is one of the best, and produces some very collectable crystals. Enjoy!
Luke has been said contact Bobby for sure, but they start at 300 and go up.
Thanks! Your answer is awaiting moderation.