There was never a "transition from coal to oil". Oil was just added to coal. The world produces and consumes today more coal than ever. But there are lots of depleted coal mines around. Most of the abandoned mines simply run out of coal. The depletion shows as rising costs and decreasing profitability as the coal becomes more and more difficult to mine. That is why it appears that these mines were abandoned for economic reasons, not for lack of coal.

Some of the abandoned coal mines can be reopened but the they cannot never again reach their highest production levels.

The real transition will be a transition to lower energy consumption.

agreed, I was just commenting that all transitions have some pain, even ones that achieve a greater efficiency over the long run. What areas will be the peak oil equivalent of the abandoned mining towns? Probably most of the Southwest and most areas of suburban sprawl...It will not be a smooth transition.