Wow, now that's what I call a spanner! Interesting place, Fran, and I love your two-handed selfie. Keep enjoying the great outdoors and telling us about it.
From the photos it looks like Iron Knob - an old iron ore mine operated by BHP - they closed it down and I think have reopened part of it. Its south west of Pt Augusta, north west of Whyalla and close to the Iron Baron mine (the township was bulldozed a few years back). Most of the mining has now moved to Iron Duke and Iron Prince south of Whyalla.