Sergio,
I usually get really excited if I see something that is greater than 15
mV/V over background. That is just based upon looking up several papers
where there were good IP surveys that later became mines. But that is
assuming you are using the standard Newmont window (0.45 - 1.1 seconds)
for a 2 second pulse. Some contractors will deliberately choose earlier
time windows so they get bigger anomalies.
But of course, like Kim points out, the biggest response is from the
outer halo caused by the propylitic zone, so the main mineralized zone
will most likely have a weaker response.
Clark
On 1/23/21 1:49 PM, S E Geoscience and Exploration via SEGMIN wrote:
Dear all,
Question for all those porphyry explorers: What chargeability value
would you consider to be already anomalous for primary mineralization?
Of course this value does not only depend on Sulphide-%, but also on
its type of occurrence.
Thank you in advance for the discussion,
Regards
--
*Sergio Espinosa, Ph.D., P.Geo*
Director, Geophysics
*S E G*eoscience & *Ex*ploration
-----------------------
SEGMIN community mailing list service ([email protected]).
Change your personal options here:
https://lists.geosoft.com/mailman/options/segmin/clark%40bigskygeo.com
Colleagues can join here: https://lists.geosoft.com/mailman/listinfo/segmin
Archives: https://lists.geosoft.com/mailman/private/segmin/
NOTE that <Reply> will reply to all members of the list.
--
Clark Jorgensen
Big Sky Geophysics
P.O. Box 353
Bozeman, MT 59771 USA
+1 (406) 587-6330 office
+1 (406) 580-9718 mobile
-----------------------
SEGMIN community mailing list service ([email protected]).
Change your personal options here:
https://lists.geosoft.com/mailman/options/segmin/archive%40mail-archive.com
Colleagues can join here: https://lists.geosoft.com/mailman/listinfo/segmin
Archives: https://lists.geosoft.com/mailman/private/segmin/
NOTE that <Reply> will reply to all members of the list.
