Amigos, because of sedimentary sulphides in rocks and marshes,...

Amigos, because of sedimentary sulphides in rocks and marshes, it has been very difficult to interpet traditional geophysical surveys at Fraser Lake. The sulphides give too many false positives for EM and IP geophysics. So let's examine how nickel-copper sulphide intrusions form, in general. Often when intrusions carry metals from the deep mantle they are poor in sulphides. However when these liquids rise into the top 5 to 10 km of the crust, they melt sulphic crustlal layers. Then the metals in the melt (such as nickel, copper cobalt) are able to combine with the suphides to form a very dense mixture (the massive metal suphides that Coraon has been after for 10 years or so). These dense mixtures sink towards the bottom of the molten intrusion (ie to the basal layer). That is, the melt differentiates into different layers depending on the density of the various mineral mixures in the melt. When Corazon reported low levels of nickel in the south pipe, it was a clear sign that their model did not add up. They fould that the south pipe contained breccia (fragmented rock pieces probably from a massive deep eruption). They had been hoping that the breccia at south pipe contains metal sulphides (ie like in Lynn Lake), but often breccias are barren of metals. So after the downhole EM drilling before Christmas, the new interpretation is that the metals came from the souh pipe, but didn't stay there. Instead the hot pressurised melt exploded through weaknesses in the country rock and, with the addition from sulphides in crustal rocks, it produced massive metal sulfdes which eventually sank to bottom layer of the melt (basal layers). This new interpretation is very plausable. It has taken many companies several decades to drill and to chase the dream at Fraser Lake. The drilling by Coraon last year, where it tested the Mobile MT and downhole EM targets, had to be done, but the targets only held barren sulphides - false positives, again. Now Corazon has gone to using gravity geophysics to find the dense massive metal sulphides and reckons that the matrix trend where they have had most success, is where they should extend and focus their exploration. False positivies with gravity are still possible. However, the matrix trend has been the smoking gun - it contains the remnants of the metal sulhides as they flowed towards the basal plates. Only time will tell, but IMO the story is coming to a climax. Good luck all.