RE: QuestionThat's a great question. Of course doing a simple visual analysis of the core sample will reveal a wealth of info on what they're drilling into. Hitting realgar, orpiment, or any other sulphide is an extremely encouraging sign - both are easily identified by color......and smell (in the case of other sulphides). But having a handheld device that detects the presence of PM's?....... that would be THE sh1t!