This will give you a Medium Private Mine in-game, you can access your private mine using /privatemine
You can configure the mine composition, who has access to mine there, and more all by clicking the bedrock border.
Private Mine Perks:
Anyone who mines in your private mine will receive a 1.3x permanent sell multiplier while mining in it, added on to any other multipliers they have active from their donator rank, outpost, etc.