DigsY2K15

I get a message from my coal mine that 'extraction halted, no coal in ground' but the map shows a generous pool right under the mine

Running a single Avenue into 2 High Density Streets (and visa versa)

Play in Windowed mode

It's difficult to follow a video and play the game at the same time, When I return to windows , I usually need to close SimCity completely or it will freeze the pc. Any thoughts?

Is the ability inherent in the game or an outside mod and how is it controlled