If you assume that there is a "sponge" six hundred meters deep or more, that contains gold... and that sponge got heated up and squeezed hard enough that the gold they've found was melted and forced out of the sponge, all the way to the surface...
The questions are...
First, how much gold is there, near the surface, and what value does it have ?
Second, given the extent of the ores near the surface, and the higher values in the gold that is being found near the surface, how much of what was in the sponge does it represent ? Did the sponge get squeezed dry... so all the gold there was in the sponge is now on the surface ? Or, do the higher values that are being found indicate, instead, that there is a really rich sponge down there, with only a fraction of it having been forced to the surface ?
We're not sure, yet, what the focus is in the effort in exploration they're conducting now.
Are they looking to answer the first question... about the extent and value of what is near the surface ? Or, are they looking to answer the second question... about the sources of the stuff they've already found ? Some of each ?
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