Barry, Do you do chg-measurements on core samples? Do you have standards similar to those hockey pucks for mag susc?
Regards On Sun, Jan 24, 2021 at 8:24 PM Barry Bourne via SEGMIN < [email protected]> wrote: > I also agree with Kim about the bulk of the IP response coming form the > propylitic zone. However, I would like to see a few more examples of > frequency domain IP done over some porphyry systems. I like the thought of > being able to discern grainsize and/or mineral species. > > > > Cheers > > Barry > > > > *From:* SEGMIN <[email protected]> *On Behalf Of *Kim > Frankcombe via SEGMIN > *Sent:* Sunday, 24 January 2021 9:46 AM > *To:* [email protected] > *Cc:* Kim Frankcombe <[email protected]> > *Subject:* Re: [SEGMIN] Question for porphyry explorers > > > > Sergio > > It also depends on the integration window you use for chargeability, the > frequency of your Tx or more correctly the length of the on time and a > bunch of other geology factors. I don't stress too much about absolute > values although I know plenty who do. If they want to walk away from an > anomaly that is >2 times background it just leaves more for the rest of us > to find. Having said all that typical anomalies are usually in the 2 - 4 x > background level but I still wouldn't walk from something bigger, > particularly if you can make a geologically cohearent story around it. The > survey obviously has to be big enough to know what background is and for > porphyries too many surveys never get out of alteration. > > The bulk of the IP response is coming from the propylitic zone not the > primary mineralisation which while often chargeable is usually drowned out > by the propylitic response. i.e you are looking for alteration more so than > the ore. > > Cheers > Kim > > > > On 24/1/21 4:49 am, 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/kim%40exploregeo.com.au > > 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. > > > > -- > > *Kim Frankcombe* > > Senior Consulting Geophysicist > > > > *ExploreGeo* > > PO Box 1191, Wangara, WA 6947 AUSTRALIA > > Unit 6,10 O’Connor Way, Wangara, WA 6065, Australia > > Phone +61 (0)8 62017719 - if your call goes to voice mail, leave a > message. It converts to an email which I'll get where ever I am! > > Email [email protected] > ----------------------- > SEGMIN community mailing list service ([email protected]). > Change your personal options here: > https://lists.geosoft.com/mailman/options/segmin/se.geoscience.and.exploration%40gmail.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. > -- *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/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.
