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Update broken links. Use https in links from `references.bib`. Ignore
some domains that fail when performing a linkcheck.

---------

Co-authored-by: Santiago Soler <santisoler@fastmail.com>
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2 changes: 1 addition & 1 deletion README.md
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[![DOI](https://zenodo.org/badge/42916308.svg)](https://zenodo.org/badge/latestdoi/42916308)

This repository is the source for the open-textbook EM-GeoSci: https://em.geosci.xyz. This was the main textbook-resource used
for the [Society of Exploration Geophysics 2017 Distinguished Instructor Short Course](https://seg.org/Education/Courses/DISC/2017-DISC-Doug-Oldenburg)
for the [Society of Exploration Geophysics 2017 Distinguished Instructor Short Course](https://doi.org/10.1190/tle40020140.1)


9 changes: 7 additions & 2 deletions conf.py
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'https://gif.eos.ubc.ca/sites/default/files/Yang16.pdf',
'https://www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0ahUKEwjy65rOo8fRAhVJ1WMKHYO7CJAQFggkMAE&url=http%3A%2F%2Fwww.dmec.ca%2FDMEC%2Fmedia%2FDocuments%2FLalor%2520Symposium%2FLalor_Symposium_Oct-2014_Handout.pdf&usg=AFQjCNHYYoQbCDs7vftzMyfuY28XUkTItQ&sig2=KDwe8n7CRvmEvAOAcKh5Zg&cad=rja',
'https://gif.eos.ubc.ca/sites/default/files/McMillan_parametric.pdf',
'http://seg.org',
'https://seg.org',
'http://library.seg.org/doi/',
'http://www.publish.csiro.au/EX/pdf/ASEG2016ab212',
'https://www.onepetro.org/conference-paper/SEG-2012-1478',
'https://doi.org/*',
'http://canada.debeersgroup.com/* ',
'https://www.sensoft.ca',
]
'https://www.tandfonline.com/journals/texg20',
r"https://library.seg.org",
r"https://epubs.siam.org",
r"https://www.sciencedirect.com",
]

linkcheck_retries = 3
linkcheck_timeout = 900

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8 changes: 4 additions & 4 deletions content/case_histories/albany/index.rst
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**Special Thanks**

Thanks to the `Society of Exploration Geophysicists <http://seg.org>`__ for permission to reproduce figures and adapt text from:
Thanks to the `Society of Exploration Geophysicists <https://seg.org>`__ for permission to reproduce figures and adapt text from:

- Jean M. Legault, Josh Lymburner, Kevin Ralph, Peter Wood, Marta Orta, Alexander Prikhodko, and Nasreddine Bournas (2015) The Albany graphite discovery - a airborne and ground time-domain EM. SEG Technical Program Expanded Abstracts 2015: pp. 2056-2060. `https://doi.org/10.1190/segam2015-5908480.1 <https://doi.org/10.1190/segam2015-5908480.1>`__
- Jean M. Legault, Josh Lymburner, Kevin Ralph, Peter Wood, Marta Orta, Alexander Prikhodko, and Nasreddine Bournas (2015) The Albany graphite discovery - a airborne and ground time-domain EM. SEG Technical Program Expanded Abstracts 2015: pp. 2056-2060. `https://doi.org/10.1190/segam2015-5908480.1 <https://doi.org/10.1190/segam2015-5908480.1>`__

The material presented here has been modified from the SEG-published version and is subject to the `SEG terms of use and conditions <https://seg.org/Publications/Policies-and-Permissions/Permissions>`__. This case history was presented as a part of the `SEG 2017 Distinguished Instructor Short Course <https://seg.org/Education/Courses/DISC/2017-DISC-Doug-Oldenburg>`__.
The material presented here has been modified from the SEG-published version and is subject to the `SEG terms of use and conditions <https://library.seg.org/page/policies/permissions>`__. This case history was presented as a part of the `SEG 2017 Distinguished Instructor Short Course <https://doi.org/10.1190/tle40020140.1>`__.

.. Thanks to the `Society of Exploration Geophysicists <http://seg.org>`__ and `Geotech Ltd. <http://www.geotech.com>`__ for permission to reproduce figures and adapt text from the source material. This case history was adapted from the expanded abstract `"Airborne and Ground Time-Domain EM results from the Albany Graphite Discovery" <http://www.cronegeophysics.com/wp/wp-content/uploads/2015/04/Albany-Graphite-Air-Ground-TEM_Expanded_abstract_final-13-Feb-2015.pdf>`__.
.. Thanks to the `Society of Exploration Geophysicists <https://seg.org>`__ and `Geotech Ltd. <http://www.geotech.com>`__ for permission to reproduce figures and adapt text from the source material. This case history was adapted from the expanded abstract `"Airborne and Ground Time-Domain EM results from the Albany Graphite Discovery" <http://www.cronegeophysics.com/wp/wp-content/uploads/2015/04/Albany-Graphite-Air-Ground-TEM_Expanded_abstract_final-13-Feb-2015.pdf>`__.
**Abstract**

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8 changes: 4 additions & 4 deletions content/case_histories/aspen/index.rst
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**Special Thanks**

Thanks to the `Society of Exploration Geophysicists <http://seg.org>`__ for permission to reproduce figures and adapt text from:
Thanks to the `Society of Exploration Geophysicists <https://seg.org>`__ for permission to reproduce figures and adapt text from:

- Sarah Devriese and Douglas Oldenburg (2016) From exploration to reclamation: Using EM methods at SAGD sites in the Athabasca oil sands. SEG Technical Program Expanded Abstracts 2016: pp. 965-970. `https://doi.org/10.1190/segam2016-13842507.1 <https://doi.org/10.1190/segam2016-13842507.1>`__
- Sarah Devriese and Douglas Oldenburg (2016) From exploration to reclamation: Using EM methods at SAGD sites in the Athabasca oil sands. SEG Technical Program Expanded Abstracts 2016: pp. 965-970. `https://doi.org/10.1190/segam2016-13842507.1 <https://doi.org/10.1190/segam2016-13842507.1>`__

The material presented here has been modified from the SEG-published version and is subject to the `SEG terms of use and conditions <https://seg.org/Publications/Policies-and-Permissions/Permissions>`__. This case history was presented as a part of the `SEG 2017 Distinguished Instructor Short Course <https://seg.org/Education/Courses/DISC/2017-DISC-Doug-Oldenburg>`__.
The material presented here has been modified from the SEG-published version and is subject to the `SEG terms of use and conditions <https://library.seg.org/page/policies/permissions>`__. This case history was presented as a part of the `SEG 2017 Distinguished Instructor Short Course <https://doi.org/10.1190/tle40020140.1>`__.

.. Thanks to the `Society of Exploration Geophysicists <http://seg.org>`__ for permission to reproduce figures and adapt text from the source material. This case study is based on the extended abstract `"From exploration to reclamation: using EM methods at SAGD sites in the Athabasca oil sands" <http://library.seg.org/doi/abs/10.1190/segam2016-13842507.1>`__ :cite:`DevrieseOldenburg2016a`.
.. Thanks to the `Society of Exploration Geophysicists <https://seg.org>`__ for permission to reproduce figures and adapt text from the source material. This case study is based on the extended abstract `"From exploration to reclamation: using EM methods at SAGD sites in the Athabasca oil sands" <http://library.seg.org/doi/abs/10.1190/segam2016-13842507.1>`__ :cite:`DevrieseOldenburg2016a`.
**Abstract**

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**Special Thanks**

Thank to `Rock Solid Images <http://rocksolidimages.tech>`__ for for permission to
Thank to `Rock Solid Images <https://rocksolidimage.com/>`__ for for permission to
reproduce figures and adapt text from the source material. This case history has been
taken from the paper `"Predicting resevoir properties using CSEM, pre-stack seismic and well log data: case study in Hoop area, Barents Sea, Norway" <https://doi.org/10.1190/INT-2016-0097.1>`__ .

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6 changes: 3 additions & 3 deletions content/case_histories/bookpurnong/index.rst
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**Special Thanks**

Thanks to the `Exploration Geophysics <https://www.tandfonline.com/toc/texg20/current>`__ for permission to reproduce figures and adapt text from:
Thanks to the `Exploration Geophysics <https://www.tandfonline.com/journals/texg20>`__ for permission to reproduce figures and adapt text from:

- Andrea Viezzoli, Esben Auken, and Tim Munday (2009). ”Spatially constrained inversion for quasi 3D modelling of airborne electromagnetic data – an application for environmental assessment in the Lower Murray Region of South Australia.” Exploration Geophysics, 40(2), 173-183. `https://doi.org/10.1071/EG08027 <https://doi.org/10.1071/EG08027>`__

This case history was presented as a part of the `SEG 2017 Distinguished Instructor Short Course <https://seg.org/Education/Courses/DISC/2017-DISC-Doug-Oldenburg>`__.
This case history was presented as a part of the `SEG 2017 Distinguished Instructor Short Course <https://doi.org/10.1190/tle40020140.1>`__.


.. Thanks to the `Society of Exploration Geophysicists <http://seg.org>`__ and SkyTEM for permission to reproduce figures and adapt text from the source material. This case history is based upon two articles:
.. Thanks to the `Society of Exploration Geophysicists <https://seg.org>`__ and SkyTEM for permission to reproduce figures and adapt text from the source material. This case history is based upon two articles:
.. - `Spatially constrained inversion for quasi 3D modelling of airborne electromagnetic data – an application for environmental assessment in the Lower Murray Region of South Australia <http://library.seg.org/doi/abs/10.1071/EG08027>`_ by Viezzoli, Auken and Munday :cite:`viezzoli2009` and
.. - `Accurate quasi 3D versus practical full 3D inversion of AEM data – the Bookpurnong case study <http://www.hgg.geo.au.dk/Papers_EndNote/0477620876/VIEZZOLI2010C.pdf>`_ by Viezzoli, Munday, Auken and Christiansen :cite:`viezzoli2010`.
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4 changes: 2 additions & 2 deletions content/case_histories/do27do18tkc/index.rst
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**Special Thanks**

Thanks to the `Society of Exploration Geophysicists <http://seg.org>`__ for permission to reproduce figures and adapt text from:
Thanks to the `Society of Exploration Geophysicists <https://seg.org>`__ for permission to reproduce figures and adapt text from:

- Sarah G. R. Devriese, Kristofer Davis, and Douglas W. Oldenburg (2017). ”Inversion of airborne geophysics over the DO-27/DO-18 kimberlites — Part 1: Potential fields.” Interpretation, 5(3), T299-T311. `https://doi.org/10.1190/INT-2016-0142.1 <https://doi.org/10.1190/INT-2016-0142.1>`__
- Dominique Fournier, Seogi Kang, Michael S. McMillan, and Douglas W. Oldenburg (2017). ”Inversion of airborne geophysics over the DO-27/DO-18 kimberlites — Part 2: Electromagnetics.” Interpretation, 5(3), T313-T325. `https://doi.org/10.1190/INT-2016-0140.1 <https://doi.org/10.1190/INT-2016-0140.1>`__
- Seogi Kang, Dominique Fournier, and Douglas W. Oldenburg (2017). ”Inversion of airborne geophysics over the DO-27/DO-18 kimberlites — Part 3: Induced polarization.” Interpretation, 5(3), T327-T340. `https://doi.org/10.1190/INT-2016-0141.1 <https://doi.org/10.1190/INT-2016-0141.1>`__

The material presented here has been modified from the SEG-published version and is subject to the `SEG terms of use and conditions <https://seg.org/Publications/Policies-and-Permissions/Permissions>`__. This case history was presented as a part of the `SEG 2017 Distinguished Instructor Short Course <https://seg.org/Education/Courses/DISC/2017-DISC-Doug-Oldenburg>`__.
The material presented here has been modified from the SEG-published version and is subject to the `SEG terms of use and conditions <https://library.seg.org/page/policies/permissions>`__. This case history was presented as a part of the `SEG 2017 Distinguished Instructor Short Course <https://doi.org/10.1190/tle40020140.1>`__.

**Abstract**

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.. _MAG3D: http://mag3d.readthedocs.io/en/latest/
.. _MAG3D: https://mag3d.readthedocs.io/


Frequency-Domain EM
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All data used in this study were converted from their native coordinate system
to the NAD27-UTM 12N (`EPSG 26712`_) projection prior to processing.

.. _EPSG 26712: http://spatialreference.org/ref/epsg/nad27-utm-zone-12n/
.. _EPSG 26712: https://spatialreference.org/ref/epsg/26712/

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**Special Thanks**

Thanks to the `Society of Exploration Geophysicists <http://seg.org>`__ for permission to reproduce figures and adapt text from:
Thanks to the `Society of Exploration Geophysicists <https://seg.org>`__ for permission to reproduce figures and adapt text from:

- Kaspar Merz, Hansruedi Maurer, Lasse Rabenstein, Thomas Buchli, Sarah M. Springman, and Matthias Zweifel (2016). ”Multidisciplinary geophysical investigations over an alpine rock glacier.” GEOPHYSICS, 81(1), WA147-WA157. `https://doi.org/10.1190/geo2015-0157.1 <https://doi.org/10.1190/geo2015-0157.1>`__

The material presented here has been modified from the SEG-published version and is subject to the `SEG terms of use and conditions <https://seg.org/Publications/Policies-and-Permissions/Permissions>`__. This case history was presented as a part of the `SEG 2017 Distinguished Instructor Short Course <https://seg.org/Education/Courses/DISC/2017-DISC-Doug-Oldenburg>`__.
The material presented here has been modified from the SEG-published version and is subject to the `SEG terms of use and conditions <https://library.seg.org/page/policies/permissions>`__. This case history was presented as a part of the `SEG 2017 Distinguished Instructor Short Course <https://doi.org/10.1190/tle40020140.1>`__.

**Abstract**

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.. topic :: Prelude
This case history follows the use of airborne and ground-based TDEM surveys to locate and characterize a deeply buried very massive sulphide deposit in the Flin Flon Greenbelt, Manitoba/Saskatchewan, Canada.
This case history follows the use of airborne and ground-based TDEM surveys to locate and characterize a deeply buried very massive sulphide deposit in the Flin Flon Greenbelt, Manitoba/Saskatchewan, Canada.
**Special Thanks**

Thanks to the `Society of Exploration Geophysicists <http://seg.org>`__ for permission to reproduce figures and adapt text from:
Thanks to the `Society of Exploration Geophysicists <https://seg.org>`__ for permission to reproduce figures and adapt text from:

- Yang Dikun and Oldenburg Douglas W. (2017). ”3D inversion of total magnetic intensity data for time-domain EM at the Lalor massive sulphide deposit.” Exploration Geophysics, 48(2), 110-123. `https://doi.org/10.1071/EG15070 <https://doi.org/10.1071/EG15070>`__
- Yang Dikun and Oldenburg Douglas W. (2017). ”3D inversion of total magnetic intensity data for time-domain EM at the Lalor massive sulphide deposit.” Exploration Geophysics, 48(2), 110-123. `https://doi.org/10.1071/EG15070 <https://doi.org/10.1071/EG15070>`__

The material presented here has been modified from the SEG-published version and is subject to the `SEG terms of use and conditions <https://seg.org/Publications/Policies-and-Permissions/Permissions>`__. This case history was presented as a part of the `SEG 2017 Distinguished Instructor Short Course <https://seg.org/Education/Courses/DISC/2017-DISC-Doug-Oldenburg>`__.
The material presented here has been modified from the SEG-published version and is subject to the `SEG terms of use and conditions <https://library.seg.org/page/policies/permissions>`__. This case history was presented as a part of the `SEG 2017 Distinguished Instructor Short Course <https://doi.org/10.1190/tle40020140.1>`__.

.. Thanks to the `Society of Exploration Geophysicists <http://seg.org>`__ for permission to reproduce figures and adapt text from the source material. This case history was adapted from `"3D inversion of total magnetic intensity data for time-domain EM at the Lalor massive sulphide deposit" <https://gif.eos.ubc.ca/sites/default/files/Yang16.pdf>`__ (:cite:`yangoldenburg2016`) and `"Mine scale description of the mineralization at the Lalor deposit, Snow Lake, Manitoba, Canada" <https://www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0ahUKEwjy65rOo8fRAhVJ1WMKHYO7CJAQFggkMAE&url=http%3A%2F%2Fwww.dmec.ca%2FDMEC%2Fmedia%2FDocuments%2FLalor%2520Symposium%2FLalor_Symposium_Oct-2014_Handout.pdf&usg=AFQjCNHYYoQbCDs7vftzMyfuY28XUkTItQ&sig2=KDwe8n7CRvmEvAOAcKh5Zg&cad=rja>`__ (:cite:`Taylor2014`).
.. Thanks to the `Society of Exploration Geophysicists <https://seg.org>`__ for permission to reproduce figures and adapt text from the source material. This case history was adapted from `"3D inversion of total magnetic intensity data for time-domain EM at the Lalor massive sulphide deposit" <https://gif.eos.ubc.ca/sites/default/files/Yang16.pdf>`__ (:cite:`yangoldenburg2016`) and `"Mine scale description of the mineralization at the Lalor deposit, Snow Lake, Manitoba, Canada" <https://www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0ahUKEwjy65rOo8fRAhVJ1WMKHYO7CJAQFggkMAE&url=http%3A%2F%2Fwww.dmec.ca%2FDMEC%2Fmedia%2FDocuments%2FLalor%2520Symposium%2FLalor_Symposium_Oct-2014_Handout.pdf&usg=AFQjCNHYYoQbCDs7vftzMyfuY28XUkTItQ&sig2=KDwe8n7CRvmEvAOAcKh5Zg&cad=rja>`__ (:cite:`Taylor2014`).
**Abstract**

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:name: lalor_thumbnail_index


.. - The Lalor deposit is a volcanogenic massive sulphide that is characterised as a stack of conductive ore lenses buried more than 600 m deep.
.. - Helicopter sub-audio magnetics (HeliSAM) survey using a ground large transmitter loop and an airborne total magnetic intensity magnetometer receiver was employed to measure the time-domain EM responses of the conductive ore bodies.
.. - The Lalor deposit is a volcanogenic massive sulphide that is characterised as a stack of conductive ore lenses buried more than 600 m deep.
.. - Helicopter sub-audio magnetics (HeliSAM) survey using a ground large transmitter loop and an airborne total magnetic intensity magnetometer receiver was employed to measure the time-domain EM responses of the conductive ore bodies.
.. - The Lalor ore lenses, as well as another small sulphide-bearing argillite, are imaged by 3D inversion.
.. - Advanced inversion techniques, including warm-start and mesh refinement, were required to obtain high-quality 3D conductivity models.
The Lalor deposit is a massive sulphide that is characterized as a stack of conductive ore lenses buried more than 600 m deep. As of 2014, the deposit has a reserve of 15.2 Mt and an inferred resource of 10.1 Mt. Compared to typical Canadian gold deposits, the Lalor lake deposit has a grade 130% above the average.

In order to characterize the Lalor lake deposit, a helicopter sub-audio magnetic (HeliSAM) survey using a ground large transmitter loop and an airborne total magnetic intensity magnetometer receiver was employed to measure the time-domain EM responses of the conductive ore bodies. Using inversion, the Lalor ore lenses as well as small sulphide-bearing argillite units were successfully imaged in 3D. The successful inversion of the geophysical data was made possible through the use of warm-start and mesh refinement algorithms.
In order to characterize the Lalor lake deposit, a helicopter sub-audio magnetic (HeliSAM) survey using a ground large transmitter loop and an airborne total magnetic intensity magnetometer receiver was employed to measure the time-domain EM responses of the conductive ore bodies. Using inversion, the Lalor ore lenses as well as small sulphide-bearing argillite units were successfully imaged in 3D. The successful inversion of the geophysical data was made possible through the use of warm-start and mesh refinement algorithms.


**Contents**
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