text: Just found a source for this - http://earthwise.bgs.ac.uk/index.php/Carboniferous_of_the_Wear_Valley_and_Derwent_Gorge,_County_Durham_-_an_excursion (via https://durhamcow.com/coal-mines-caves-quarries-in-the-heart-of-durham-city/) - seems this is shaft is part of Elvet Landsale Colliery and the other I mentioned is Henry Pit.