Where are JR's Lands?
You can pick the land you mine. Look at the Planets below and open the collapsible group to see the Lands from which to select. Once you have picked out the coordinates you want to use (any will do), select mining land here and begin mining.
To see the origin and history of each of JR's Lands, you can uncollapse the text below by clicking on the arrow to the right of the Planet and see the lands. Each is linked to the origin page, which includes a full history of each Land, as stored permanently on the blockchain.