Inclines not tramways, and levels go down from mill level,1,2,A,B,C,D,E,F,*G* and 2 chambers in H* (*=flooded) And reason you might have to go up a level when chamber was worked they used to throw waste in it rather than haul it out,(and you might be in a certain vein) remember there was 5 different slate veins there so when you see survey or map you respect those old miners more & more. Sorry those hobnail boot marks were done by someone taking the pi$$
And please if exploring the mine refrain from spraying bright graffiti everywhere (not saying it was you, just saying to everyone)