The headgear on the L is for the West Shaft sunk circa 1950 to use as the main ventilation upcast.
The headgear on the R is for the Lodge Pit shaft sunk Jan 8th1840 - Jun 28th 1841 to 470 ft / 143.23 m just below the Busty Bank seam [1] and deepend at some point to 539 ft / 164.3 m just below the Brockwell seam [2].
1. An Account of the strata of Northumberland & Durham as proved by Borings & Sinkings, Volume L-R, North of England Institute of Mining & Mechanical Engineers, 1887
2. Marley Hill Colliery abandonment plans for Harvey (N) and Tilley (P) seams
Photograph:
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