Shafts	Index	Shafts

Geology encountered   Thickness   Depth   ft. in.   ft. in. High Grit Sill (lead bearing)    61  3     61  3 Plate and black bed    6  0     67  3 Low Grit Sill (lead bearing)    99  6     166  9 Plate    5  0     171  9 Limestone    2  0     173  9 COAL    1  0     174  9 Crag Sill (lead bearing)    35  0     209  9 Plate    10  0     219  9 Limestone    4  6     224  3 PattinsonЖs Sill    17  6     241  9 Plate, with metal posts    80  0     321  9 Little Limestone    7  0     328  9 COAL    1  0     329  9 High Coal Sill    27  0     356  9 Plate and coal    10  0     366  9 Low Coal Sill    68  3     435  0 Plate    5  0     440  0 Great Limestone    53  6     493  6 Tuft    5  0     498  6 Plate    12  0     510  6 Limestone    5  0     515  6

Source: An Account of the strata of Northumberland & Durham as proved by Borings & Sinkings, Supplement, published by the North of England Institute of Mining & Mechanical Engineers, 1910

  original entry for sinking/boring number 2789 in "An Account of the strata of Northumberland & Durham as proved by Borings & Sinkings, Supplement, published by the North of England Institute of Mining & Mechanical Engineers, 1910"

  main page for Derwent Mines (Lead Ore)