Shafts	Index	Shafts

Geology encountered   Thickness   Depth   ft. in.   ft. in. Earthwork    48  0     48  0 Grey metal    9  0     57  0 Grey post    34  0     91  0 Grey post    32  0     123  0 Grey metal, with post girdles    9  0     132  0 COAL - Metal Coal Seam    4  10     136  10     COAL    1  6            Grey metal stone    1  4            COAL    2  0        Blue metal    48  0     184  10 Strong sharp black metal    1  8     186  6 COAL - Main Seam    4  6     191  0 I am of opinion that the Metal Coal is the seam which Mr. Shallet is at present endeavouring to win at Chirton. — J. W.    0  0     191  0      0  0     191  0 July, 1755. — Although I was of opinion, in August. 1764, that this was Hartley Metal Coal, I am now more fully of opinion that it is Long Benton Seam, as it seems to be so by many convincing symptoms.— J. W.    0  0     191  0

Source: An Account of the strata of Northumberland & Durham as proved by Borings & Sinkings, Volume F-K, published by the North of England Institute of Mining & Mechanical Engineers, 1885

  original entry for sinking/boring number 1059 in "An Account of the strata of Northumberland & Durham as proved by Borings & Sinkings, Volume F-K, published by the North of England Institute of Mining & Mechanical Engineers, 1885"

  main page for Hartley Colliery