 |
 |
The Hanwood coalfield around Shrewsbury had three seams of coal, the Yard, Half Yard and Thin whose total thickness rarely achieved 6 foot. Is anyone willing to hazard a guess as to how many acres (square miles?) would need to be mined in the late 19th century, assuming uniform seam thickness, to extract 2,280,000 tons from just the first two of these seams, four feet six inches max in total, over 21 years. Michael Shaw