The scientist say that this mine was last in use around 48,000 years ago. It was used to mine ochre, which is an a material that was used extensively in human history. It is a natural clay pigment ...

With the resources and expertise from Mizzou, the group, headed by MacDonald, identified the location of the oldest ochre mine in the world and mapped out how ochre from the mine was distributed ...

which they believed contained 50 to 100 million tons of ochre. “Operations at the mine will start at once,” the company president said. Most paint manufacturers used French ochre, but the ...