I hit the STOP button.
"Tom, I can't believe that many minerals all in one spot. Was that your doing?"
"It was not. Except for the limestone, which is a common mineral throughout the Carpathians, those were all small deposits. None of them would have been commercially exploitable in the twentieth century, when volumes were large and transportation cheap. Small deposits like that are common in Europe. Conrad just lucked out, having them all so close together."
"Anyway, stop interrupting."
He pressed the START button.