Nazzysmith
to me, the line between shallow and deep is about 100-150m
And I saw this earlier today, might help clarify for you...
'Conceptual mining study on large Excelsior resource supports deep (175m) openpit potential.'
http://hotcopper.com.au/announcementFiles/2011/EXG/dc0be864-87be-40d5-883c-7460fa918792-EXG557930.pdf
