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Questions related from Steve Johnson
A favorable magmatic signature for a porphyry copper may not indicate tonnage of copper...but there might be a lower bound. Either in copper tonnage, or volume of source rock. Fertility is not...
09 May 2025 6,726 2 View
My interest is in recognizing adakite without going through chemical analysis. I believe there are some situations where remnant garnet minerals might be found....particularly in dike breccia...
24 April 2025 5,994 6 View
Voisy just published a paper on gold nugget formation under seismic piezometric conditions that has pretty much gone viral. Even Anton Petrov on YouTube has chimed in. The full text is hard to...
10 September 2024 1,574 5 View
Radiogenic daughter products! Back to the Future lead lead age dates. There is way way too much radiogenic lead in Upper Mississippi Valley deposits of NW Illinois. Reports suggest the...
06 March 2023 2,577 5 View
Has anyone found signs of magmatic material from within the "garnet-in" isograd that is reportedly responsible for oxidized magmas? My bet is someone should find garnet...pyrope/spessartine...
17 February 2022 4,873 27 View
Is it an accidental occurrence or is it essential for say, good ones? There is an excellent CODES sponsored writeup of Lihir, the gold mine, that points to anhydrite as a significant and...
04 July 2019 6,541 49 View
So...has anyone else found a fluidized dacite cemented "tourmaline zebra rock" like this? I have never heard of such a thing capping porphyry copper systems...tin, polymetallics...yes. But they...
01 January 1970 6,914 3 View
