> "thanks to the good pumping system" (guess what powers that) In the 19th Century? Steam engines that burn part of the extracted coal. What else? > by the l

> "thanks to the good pumping system" (guess what powers that) In the 19th Century? Steam engines that burn part of the extracted coal. What else? > by the late 19th century the seams were becoming exhausted Those particular seams, maybe. They're not the only seams, dude. I think we're done here.