[defrost]

Nah, we're right there thanks mate.

The whole inland gold belt region is filled with abandoned shafts and it's rare anyone falls down them.

What's the cost benefit in fencing off tens of thousands of individual pre existing shafts and to what degree of robust security construstion do you recommend? More to the point, what's the tax payer out of pocket cost for that?

You don't appear to have actually thought this through in any pragmatic sense.