How about "Ancient Greek and Roman Mining"?  Or "Ancient Roman Mining in Europe"? (I'm actually surprised that there is only a brief mention of mining in Greece.) 
O.K. re organization.  I'll leave it as is.
I have another question.  It is in the section "The Americas".  In the middle of the third paragraph, a quote ends, "....;" Gold Rushes...."  Besides the fact that the semi-colon is inside the quotation marks (which I understand is not WP style), the presence of the semi-colon there seems odd.  Maybe it's because of the capitalized "Gold Rushes", but perhaps a period is better there.  What do you think?