Many loyal long term, high level players have no island expansions left so up to 999 obsolete Island Parts sit in our storage. One repercussion is that Completing the Bingo Mining task is now not possible for us and for some the Mine for Land is closed altogether thus depriving us of the opportunity to find food bonuses.
SOLUTION
Allow us to sell/get rid of our useless Island Parts so that at the very least we can still achieve Bingo tasks.
For Bingo Mining task, you can try using bombs to mine instead of dynamite. Long ago, someone posted that Bingo accepts the task as complete inspite of not using dynamite.
I have not tried this as I still have both mines open.