Graigfawr,
For some reason the plan wont come up with me,but from memory,the No.4 levels are roughly.100yds Southish from the No.2 level,where a Bully/Drift ,50yds inside level went to the dip,for roughly 200yds,then turned West,as a level,i put in place a double partin at this point before i left the Colliery,other levels were driven of this drift Westwards,the whole length of the drift,these stopped near the Westward Roll/jump,shown on the plan right up through the mountain,in front of No`s 2 and 3 levels,
The jump was proven in the lower No.4 level,a 7ft jump/roll,when conveyor faces were driven Southwards firstly in the direction of Llwynonn,but never hit the workings,but a connection was made back to the surface in the old opencast high wall of the early 60`s workings.
Last time ispoke with owner,the top No.4 level,was through the No.2 workings,through the jump,but now had roughly 1ooyds of workings in the conveyor faces of No.4 to drive through before hitting solid coal,
The lower No.4 level,has roughly 150yds of No.2 gobs to drive through,the jump,and 100-150 yds of old conveyor face gobs to contend with,before an adequate ventilation system can be planned,before the main coal development can commence.
When i workedt here,the section was just over 2ft of coal,with 9ins to a foot of clod,roof was`nt to bad,but i did hit a bad slip on the level i worked in the late 70`s,the roof was dodgy for a while,with a clay slime between the beds,will rolls in the strata,but no problem for a Collier with a sharp Ty Gwyn,lol.
They reckon beyond the jump the section is nearer a yard of coal,and the clod around 6ins,but i ain`t seen it.
Think i`ve covered it all?