This clay pile looks very dark. It's because it's wet. The little white patch to the left of the bulldozer is where he has scrapped the top off to get some dry clay. So it won't clag up in the crusher.
The pink clay to the right is more like McKenzie’s clay. More iron oxide and perhaps titanium.
It was overcast on the day. All the photos came back so flat. I had a fiddle with them. Now they're a touch on the contrasty side, and with a slight cyan cast. I'll have a fiddle with the RAW files later.
Come back again, I'm sorry.
I wanted to post them though. I think they are fascinating, regardless of the cast. I do realize they could be totally boring to most people too.