Regional Mines are such that allow more than one player to gather them at a time. In order to collect from one you must first own that region with your Alliance. They also cover all 4 of the main resource types, but in comparison with the regular mines they do not shift position or disappear. After a while if uncollected a Regional Mine will change it's resource to a random different one.

Gathering happens the same way as with the rest, you can send your army to gather and have to wait for them to return. Up to 5 can gather from 1 regional mine at the same time. When the resource in the mine is depleted a cooldown indicates when the mine will recover and can be gathered again.

Base Gather Speed (Regional mines)

ResourceGather Speed
Food35,000 / h
Petroleum35,000 / h
Alloys28,000 / h
Composites21,000 / h

The base gather speed for Basic Mines can be found here