The powder house dates from around 1877 and is of a very similar design to the one at Eston, its also extremely overgrown and dirty and looks to be the haunt of young drinkers and wire burners.
Longacres Ironstone Mine Powder House
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I suppose the heavy concrete construction of the powder house generally will ensure its longevity. This is probably why those at Eston, Longacres and Belmont (to name but a few) are all still standing today, many years after construction.
I see this relic has recently been uncovered during the earth works as the site is developed. Passed it hundreds of times but now it stands out like a sore thumb!