. . . .Explosive - rats ! (General)
.. and 10 points for observation !!
I have seen a photo or two of Miners again with "ties" around their legs just below the knee, and given Allen Trigg's Census entry as " Coal Miner", looks like this photo was taken at the Pit Head rather than a Foundry.
Rats were just one of the many unpleasant things to contend with underground.
So back to "Long Poles" ? the most likely use that springs to mind is for loading charges / explosives / packing into the charge / shot holes after they have been drilled - I think they are call Stemmers or Stemming Rods (?) or Tamping rods.
S