Coal from Calderton, by Neil Macmillen and Mike Chapman
Book published by Lightmoor Press, 164 pages. Square paperback - c.21cm by 21cm (N5929)
There were difficulties to overcome. The coalfield would prove to be one of the most contorted and faulted in the United Kingdom, the seams of coal being thin and rarely level, although mostly free from the dangers of firedamp. Mining here would call for different methods from other coalfields. The whole area is best understood as being distorted into the shape of a basin, tilted to the east, in which the seams of coal and rock form a series of layers which lie parallel to the shape of the bowl. This symmetrical model is, however, seriously disturbed by the faults and folds which have been caused by the northward movement of the Mendip Hills.
Only a small portion of the coal measures are exposed at the surface as outcrops, due to the covering of secondary limestone rocks, the Lias and Oolite, which lie above the coal measures. The seams themselves fall into three distinct groups separated by beds of unproductive sandstones and shales, but only the Upper Coal Group was mined at Camerton at the northern eastern edge of the coalfield. This group contains two well-known series of coal-bearing rocks, the first, known as the Radstock series being worked at Camerton, known as the ‘Camerton’ series by the local miners. Lying between 500-700 feet below the surface, it forms a layer about 131/2 feet thick containing six veins which vary in thickness from 9ins to 2ft 4ins, each known by its own local name. The coal from the Radstock series was known to burn clearly and brightly, giving out a good heat and leaving little ash, useful for household purposes. Camerton was the last pit in Somerset to bring coal to the surface from this series.
As a result of the difficulties caused by the coalfield being heavily faulted the introduction of underground machinery and other improvements was often delayed although, for the same reason, Somerset miners were regarded as the most skilful and resourceful in the country. This is well illustrated by the comments made by William Smith in his correspondence in 1804, included below. Consequently, extraction became increasingly uneconomic during the early 20th century, even though it has been estimated that some four thousand million tons of coal still remain untapped in the Somerset coalfield. Nevertheless, the vision, determination and exploration of the strata came together to enable this coalfield with character to be mined for almost two hundred years...
The condition of the book is generally excellent. The covers are clean and bright, the spine is tight and intact, and all pages are clean, intact, unblemished and tightly bound. There is a price printed and a small price sticker, both on the rear side cover.