Mining has been something humans have been doing for thousands of years and it continues to be a major industry even today. Of course, what has been mined has changed over the years. According to ...

the presence or absence of ochre at an archaeological site serves as a proxy for the cultural and behavioral complexity of ancient humans. A natural pigment containing iron oxide and clay ...

Tests have identified iron ochre getting into Queens Dock, at Whitehaven, Cumbria, through a culvert. The problem has in part been blamed on a "saturated" railway tunnel which takes trains ...