That will be Lundhill Colliery and might be one of the capped shafts with its marker.
Although the colliery may have mined other stuff other than coal, which depending on what seams, may include some ironstone. But the ironstone mines tend to be further west towards Tankersley, but that's where it outcrops to surface.
I went in a mine once.... it was dark and scary..... full of weirdos
When do I get my soapbox, I need to rant on about some b***cks