concealed coalfield meaning in Hindi

Examples

1. Some examples of this include Cortonwood, Manvers Main and Elsecar Main At this time the first collieries on the concealed coalfield were opened such as Bentley & Brodsworth Main.
2. As BP s senior geologist Sir Peter Kent noted, the Atlas made Jack Wills a household name among petroleum geologists, and " Concealed Coalfields " became the bible of National Coal Board geologists.
3. This effectively opened up the'concealed coalfield .'This was followed by the mine at Snibston, by George Stephenson in the early 1830s, and Stephenson was also responsible for the creation of the Leicester and Swannington Railway at the same time.