Pages 8-12 are interesting in this link in showing how geophysics worked for this company, smack on. This discovery was found by geophysics. You can notice how their surface mineralization correlates to their anomalies at depth, only makes sense, elementary, my dear Watson.

It appears the zinc component to their mineralization as well as the copper and silver, contribute to the geophysical signatures. In contrast to this composition of their mineralization with us, zinc values are low on the Tesoro as per the samples we see, while the silver is elevated on the Tesoro, whereas it appears less on Goldquests. A common denominator between both deposits, imo, is the copper. The links to the "massive sulphide news release " for SLI seems to have been broken, but in that release you can see the ~5% copper figure being identified in the sulphides sample/s.

http://goldquestcorp.com/images/pdf/presentation/GQC_Presentation_September_2013.pdf