ken
Trainee
Posts: 46
|
Post by ken on Sept 13, 2017 2:58:37 GMT -5
Browsing through the Durham Mining Museum Deaf Hill No three shaft I see that immediately below the Five Quarter seam is four feet six of clay. This seems to be a common occurrence. My question is how do you support many feet of roof on a thick bed of clay?
|
|
|
Post by tygwyn on Sept 14, 2017 15:42:28 GMT -5
With difficulty.
|
|
Clive
Shotfirer.
![*](//storage.proboards.com/forum/images/stars/star.png)
Posts: 168
|
Post by Clive on Oct 2, 2017 10:17:31 GMT -5
Firefly, or seat earth, as it is called in Lancashire is very hard. It's harder than a lot of the rocks around it.cetainly was round rossendale and burnley.knew one collier who had worked in both coal and clay. He said the clay pit was the hardest Jun he ever had
|
|