Thread:Knj00/@comment-24774220-20140728055550/@comment-5089372-20140728135950

The last Mining expansion costs 3,690,000 coins and 148 land parts. So if you haven't got there yet your safe.

Each expansion is only the size of a large habitat so you can just count the sections... here is a pic from my island of where you need to stop. I stopped after the 19th.