Is "Data Mining" really "Data" Mining ??

I have taken up Data Mining course this fall and our prof Jiawei Han seems to have a great profile. His book ("Data Mining: Concepts and Techniques") was one of the first in this discipline. He was talking about the "Data Mining" misnomer with a simple example. When we talk about Gold mining, we actually refer to digging and mining gold out from sand or dirt or watever but when we talk about data mining, we actually dig out knowledge patterns from data. So it should actually be referred to as Knowledge mining or in better terms KDD (Knowledge Discovery in Databases)