Massive sulfides are responsible for the Quantec Drill Targets and importantly, areas where Lori drilled. Look at what the massive sulfides contain, in the excerpt below and also in the provided link.

The C1 shaft will continue to be deepened to a planned depth of 100 meters below the surface. The shaft is currently in a transition zone from oxide facies to sulphide facies. Two select samples of massive sulphides were taken from approximately the 74m level in the shaft and assayed for gold and other elements in order to see if the gold content increases, diminishes, or remains the same in the sulphide-rich vein material relative to the oxide-rich material. Assay results, listed below (both from the sulphide zone), indicate that the gold content increases in the sulphide-rich material and that the material is also enriched with silver, copper and tungsten. 

http://www.steliasmines.com/storage/news_releases/Sli-News-2007-32-FINAL.pdf