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It's worth remembering that old mine are not just holes in the ground, but also the spoil heaps around them comprising the material removed in the process of digging the shaft and any galleries running off them. Those heaps would presumably be visible for decades until they eventually are eroded flat into the landscape. There's also often other detritus such as glass, rusty cans and shards of broken crockery which reveals the earlier human presence.
Yes. But just to give you an idea of the size of that sheep station, which is definitely not the largest in the area, Oak Park is bigger than each of the 6 smallest counties in the UK.
(The state of South Australia is as big as 4 x UK)
Oak Park is about 231 sq miles in area - this chart is in sq miles.
Counties of the United Kingdom
And these mines and their surrounds have undergone 100-135 years of erosion and regrowth.
imo