Barry
when you collect full waveform data as we do with all of our modern IP
equipment, frequency and time domain data is the same thing. I can
process it in either time domain or frequency domain. The same applies
for EM
In the old equipment you only collected the off part of the cycle
therefore this was not possible.
Syd
*Syd (Sipke) Visser, P.Geo.*
President, Snr. Geophysicist/Geologist
Tel: 1 (604) 582-1100
Cell: 1 (604) 813-1440
[email protected]
www.sjgeophysics.com <http://www.sjgeophysics.com>
<http://www.sjgeophysics.com>
On 2021-01-26 4:00 a.m., [email protected] wrote:
Today's Topics:
1. Re: Question for porphyry explorers
(S E Geoscience and Exploration)
----------------------------------------------------------------------
Message: 1
Date: Mon, 25 Jan 2021 19:18:56 -0800
From: S E Geoscience and Exploration
<[email protected]>
To: [email protected]
Subject: Re: [SEGMIN] Question for porphyry explorers
Message-ID:
<CAN2kzWK=Gbpanb+3iK7FFZe0Ur=ncoSnza6W=w88ywem1u_...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
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.
-----------------------
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.
