The same seam extends through the Warwickshire coalfield,were its also called the Warwickshire Thick Coal,
5m were worked in Dawmill,with coal above.
One of the boy`s on the Welshcoalmines worked in many of these Collieries in the area since moving up in the late 40`s,reckoned the older Miner`s worked the full seam in places,either adopting a bench method,were the seam was worked in stages,or splitting the seam,holding coal up as the stall was driven to its distance,then poling the top coal down on retreat.
But like most seams,thickness`s vary from area to area,and the muck thickness`s between also differ,were in some area`s 2 or more seams come together,in other area`s the thickness`s of muck between make it not an option to work together.
From boreholes back in the 70`s,this Thick Coal extends down through Oxfordshire and possibly Berkshire,but its depth makes it impossible to work conventionally,but a good source for coal gasification.