We also have an official fan group - http://www.roblox.com/groups/group.aspx?gid=1123640
You can find up-to-date information regarding updates here as well as sharing in achievements & reporting bugs. Dummiez is very active on the group and not only welcomes new suggestions for game-play & ores but reads all posts too.
You can only join by request but we have a dedicated staff team including some Roblox Admins that work round the clock accepting miners to the group and making the required promotions.
Current available promotions are as follows -
Less than 10,000 - Novice 10,000 Mined - Skilled 100,000 Mined - Expert 500,000 Mined - Master 1,000,000 Mined - Legendary 5,000,000 Mined - Universal
Just post on the wall once your badge shows & one of the staff will rank you up asap.
And let's say you're in the fan club and you have mined 574,204 blocks. That's Master; whenever you chat before your name it says: "[Master Miner]".