The coals of the area are folded into broad anticlines and synclines trending east-northeast, intersected by faulting trending at northwest, east-west and northeast-southwest. Gradients in the seam vary, averaging 1:7 over most of the area, steepening to 1:1 in the northernmost part of the licence in the area of the Neath Disturbance.
The area of the licence is marked by the north western development of Neath Disturbance. This trends north east to south west and is related to an ancient Caledonian crustal feature, active throughout the Carboniferous period and in more recent times. In the south of the licence where the bulk of the coal resource is present, the rocks are folded into a gentle east–west trending syncline. This is confirmed by adjacent mine workings.
BLACK DIAMOND RESOURCE
Historically, in the operations at and adajacent to the old mine, 60 to 80% of the anthracite has been extracted. It is proposed that in short wall mining, a recovery factor of 65% should be considered, the assessed reserves only assume 60%.
The resource in the license area to be intially worked is assessed at 138Mt with 38Mt in the Six Feet Seam, 59Mt in the Nine Feet Seamd and 15Mt in the Peacock Seam.
BLACK DIAMOND RESERVES
The reserves in the license area to be intially worked are assessed at 40Mt with 19Mt in the Six Feet Seam and 21Mt in the Nine Feet Seam. in addition the reserves in the Peacock seam are assessed at 9Mt.