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University of Miskolc
Faculty of Earth Science and Engineering
Department of Geology and Mineral Resources
Application of predictive 3D geomodelling on the Recsk Ore Complex vertical extent, and
overview of CHPM technology at Recsk
Author: Tamás Miklovicz
Consultants: Jean-Jacques Royer, János Földessy, Éva Hartai, Géza Szebényi
miklovicz.tamas@gmail.com
Miskolc 08/06/2017
Table of content
Topic 0: Characterization of modelled deposit (Chapter 2.)
Topic 1: 3D geological modelling (Chapter 3.)
Topic 2: Grade tonnage models (Chapter 4.)
Topic 3: CHPM technology (Chapter 5.)
Conclusions (Chapter 7.)
Introduction 3D modeling Grade tonnage CHPM technology Conclusion 1/12
Literature review
Own work
Objective: geological framework/background
1. Porphyry Cu deposits
2. Skarn deposits
3. Geology/mineralization at Recsk
a. Geological structural settings
Darno Zone, diorite intrusive
b. Exploration history:
government/academics/private companies.
c. Mineralization
7 different type (porphyry, skarn, etc)
d. Resources exploration
0.4% Cu cut off, 779.3 Mt
Lot of research done at Recsk.
What changes since? Nothing new to add?
Characterization of modelled deposit
Introduction 3D modeling Grade tonnage CHPM technology Conclusion 2/12
Computing power, geo-software,
big-data, machine learning/AI,
3D geological modeling
Objectives: reprocess all relevant data and create a 3D model of the main
geological structures at Recsk deposit
Software: Paradigm GOCAD 2009.4 32 bit
Input dataset for 3D model:
- Drill coordinates, dip/azimuth/depth
- Geological cross sections
- Geophysical maps: regional (Bouguer gravity, magnetic deltaT and
deltaZ), local (filtered gravity, apparent resistivity, magnetic)
- Interpreted seismic sections
- Surface and Pre-Cenozoic geological maps
- Shuttle radar tomography mission (ASTER GDEM) data
- Google satellite, topography maps
Process:
- Data collection/preparation/cleaning
- Import/geofererence
- Digitalization
- Surface creation
Introduction 3D modeling Grade tonnage CHPM technology Conclusion 3/12
3D geological modeling
Results:
Fault system Eocene/Triassic horizons Intrusion surface
DWG files from these surfaces are available
Introduction 3D modeling Grade tonnage CHPM technology Conclusion 4/12
3D geological modeling
Results:
1. Fault system:
2. Eocene/Triassic horizons:
3. Intrusion surface:
DWG f
Introduction 3D modeling Grade tonnage CHPM technology Conclusion 5/12
Grade-tonnage calculations
Objective: use chemical data from RM drillings to create grade tonnage models for
Cu, Mo, Zn, Au, Ag.
Input data:
- 134 RM drillings trajectory
- Chemical dataset, including Cu, Pb, Zn, Mo, Fe, Se, S [%]; Au, Ag [g/t], core
recovery, polymetallic index,
- Previously created 3D models
Preprocessing:
Fix chemical data to EOV XZY from depth value (from-to base)
Introduction 3D modeling Grade tonnage CHPM technology Conclusion 6/12
Grade-tonnage calculations
How?
Creation of histograms and variograms
How?
Creation of SGrid and populate/interpolate it with the
measurements
Limitations:
- cell size: 50x50x20 m (porphyry vs skarn)
- no samples from the underground drillings, only RM
Introduction 3D modeling Grade tonnage CHPM technology Conclusion 7/12
Grade-tonnage calculations
Results:
Grade tonnage models for Cu,
Mo, Au, Ag, Zn
Introduction 3D modeling Grade tonnage CHPM technology Conclusion 8/12
CHPM technology overview at Recsk
Objective: give an overview on CHPM technology
application at Recsk
About CHPM technology
- Combined Heat, Power and Metal extraction
- Geothermal energy + mineral extraction
- → increase financial feasibility of geothermal
projects
- H2020 project, CHPM2030, University of Miskolc
Introduction 3D modeling Grade tonnage CHPM technology Conclusion 9/12
CHPM technology overview at Recsk
How?
Literature background → 3D visualization of maps/sections → Geological model down to 3 km
Introduction 3D modeling Grade tonnage CHPM technology Conclusion 10/12
Sillitoe, R. 2010: Porphyry Copper Systems.
Economic Geology, v. 105, pp. 3–41
CHPM technology overview at Recsk
Resuts:
- 3D model down to 3 km
- Deep batholith inferred
- Circumstances for
mineralization are present,
skarn
Introduction 3D modeling Grade tonnage CHPM technology Conclusion 11/12
Conclusions
Topic 1: 3D geological modelling
- surface: fault system, Eocene/Triassic
horizons, intrusive
Topic 2: Grade tonnage models
- Cu cut-off: Cu, Mo, Au, Ag, Zn
Topic 3: CHPM technology
- deep mineralization is expected
→ Opportunity in reprocessing/3D modeling
historical data
Introduction 3D modeling Grade tonnage CHPM technology Conclusion 12/12
Publication
A research does not exist until it is published!
(Grad. Research seminar, Prof Ferenc Mádai)
Conference attendance:
- 20th Congress of Hungarian Geomathematicians, 9th Congress of Croatian & Hungarian Geomathematicians “Geomathematics
in multidisciplinary science - The new frontier?”. May 2017
- 8. Kőzettani és Geokémiai Vándorgyűlés. September 2017
Paper
- Central European Geology, special issue
Other:
- Research gate: DOI: 10.13140/RG.2.2.14690.53440
- LinkedIn post and added to the profile, posted at different geomodeling groups
- News item on LPRC website
- Twitter post
- Matarka
Introduction 3D modeling Grade tonnage CHPM technology Conclusion 12+1/12
Thank you for your attention!
Jó Szerencsét!
Acknowledgements to:
LPRC, Jean-Jacques Royer, Éva Hartai, János Földessy, Géza Szebényi
Download the full text from:
https://drive.google.com/open?id=0B0rhl8Z8xj
EoZEx3ek5VVnl0WkU
Contact: tamas.miklovicz@lapalmacentre.eu @miktamas
Questions from the reviewer: PhD Viktor Mádai
Q1
Explanation for 4
1. The used interpolation algorithms are not explained.
2. Which result is closer to the reality.
3. Why would be fruitful to choose DSI or Kriging?
Reviewer’s remarks and questions to the author:
1. The intrusive body was modelled by a surface. At the beginning of the process why 20 m was choosen as a
general distance between the points on the curves?(page34)
2. Why 250 m was used between the points during the construction of faulted surface?(page 31)
3. What is the general theoretical background of densification?
4. There are no any distance scale on the maps, figures.
5. Why 200m was used as a distance criteria during the S-grid creation process? (page 36)
6. The intrusion seems to be situating on the surface (page 40 fig 3.21)
7. Although DSI is explained a bit, there are no general explanation which one is better in a given geological
settings.
(page 50)
8. Which ore body model is more plausible or realistic (Kriging or DSI based)?
9. Is there any scientific outline about the refilling velocity of hot water between the wells? (there will be a
bulge and a depression in the waterf level.)
Introduction 3D modeling Grade tonnage CHPM technology Conclusion
Questions from the reviewer: PhD Viktor Mádai
Q1
Explanation for mark 4
1. The used interpolation algorithms are not explained: page 43:
DSI or Discrete smooth interpolation is a point estimator whose criteria is to minimise the local curvature (second
derivative) between the data points values (coordinate, grades, properties) to be interpolated. The DSI interpolator
reduces the fitting error between the sampled point (called controlling object) and the data model while keeping as
objective to be as smooth as possible (GOCAD help). The advantage of this method is that it is an exact estimator and
numerically stable.
Kriging is an optimization technique based on regression against observed z values of surrounding data points in a
neighborhood, weighted according to spatial covariance values (Bohling, 2005). In other words, kriging is a point
estimator with a principle of minimizing the estimation variances (Matheron, 1962; Journel and Huijbregts 1978).
Kriging in GOCAD calculates both an estimation (estimation of the value Z) and an error variance (estimate of the
error). Kriging requires a variogram calculated on the dataset. To do the kriging, the calculated empirical variogram
has to be replaced with a “synthetic” fitted theoretical variogram.
2. Which result is closer to the reality: page 47
One of the advantage of kriging is that it considers the spatial variability of the elements by using variogram
→ kriging
3. Why would be fruitful to choose DSI or Kriging? Page 47
Introduction 3D modeling Grade tonnage CHPM technology Conclusion
Questions from the reviewer: PhD Viktor Mádai
Q1
Explanation for 4
1. The used interpolation algorithms are not explained.
2. Which result is closer to the reality.
3. Why would be fruitful to choose DSI or Kriging?
Reviewer’s remarks and questions to the author:
1. The intrusive body was modelled by a surface. At the beginning of the process why 20 m was choosen as a
general distance between the points on the curves?(page34)
2. Why 250 m was used between the points during the construction of faulted surface?(page 31)
3. What is the general theoretical background of densification?
4. There are no any distance scale on the maps, figures.
5. Why 200m was used as a distance criteria during the S-grid creation process? (page 36)
6. The intrusion seems to be situating on the surface (page 40 fig 3.21)
7. Although DSI is explained a bit, there are no general explanation which one is better in a given geological
settings.
(page 50)
8. Which ore body model is more plausible or realistic (Kriging or DSI based)?
9. Is there any scientific outline about the refilling velocity of hot water between the wells? (there will be a
bulge and a depression in the waterf level.)
Introduction 3D modeling Grade tonnage CHPM technology Conclusion
Questions from the reviewer: Dr. Szentpéteri Krisztián
My questions to the author:
1) Based on the geological modelling exercise, where would the author target; 1) exploration drilling that would the
most potentially expand the resources and 2) infill drilling that would the most potentially enhance the quality and
confidence of the resource modelling?
2) Based on the variogram analysis how many ore types can the author recognize, what they are and where they are
located in the 3D modelling space?
3) Has the author ever performed the following exercise: looking at only the assay data, without anything else (no
sections, no surface, no geophysics) purely the points hanging in the empty 3D space?
4) What does the author think; what will be the most useful geological data for modelling Recsk Deep skarn
mineralization and why?
Introduction 3D modeling Grade tonnage CHPM technology Conclusion Q2
Questions from the reviewer: Dr. Szentpéteri Krisztián
2) Based on the variogram analysis how many ore types can the author recognize, what
they are and where they are located in the 3D modelling space?
At least 3 structures can be distinguished based on sill/nugget of horizontal variograms:
- 100 m: Au,
- 350 m: Cu, Zn, Mo
- ~700 m: Pb, Ag
Mo Cu
Introduction 3D modeling Grade tonnage CHPM technology Conclusion Q2
CHPM technology overview at Recsk
Introduction 3D modeling Grade tonnage CHPM technology Conclusion 10/12
CHPM technology overview at Recsk
Introduction 3D modeling Grade tonnage CHPM technology Conclusion 11/12
3D geological modeling
Introduction 3D modeling Grade tonnage CHPM technology Conclusion 41/12
CHPM technology overview at Recsk
Introduction 3D modeling Grade tonnage CHPM technology Conclusion 9/12

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Miklovicz thesis defence 2017

  • 1. University of Miskolc Faculty of Earth Science and Engineering Department of Geology and Mineral Resources Application of predictive 3D geomodelling on the Recsk Ore Complex vertical extent, and overview of CHPM technology at Recsk Author: Tamás Miklovicz Consultants: Jean-Jacques Royer, János Földessy, Éva Hartai, Géza Szebényi miklovicz.tamas@gmail.com Miskolc 08/06/2017
  • 2. Table of content Topic 0: Characterization of modelled deposit (Chapter 2.) Topic 1: 3D geological modelling (Chapter 3.) Topic 2: Grade tonnage models (Chapter 4.) Topic 3: CHPM technology (Chapter 5.) Conclusions (Chapter 7.) Introduction 3D modeling Grade tonnage CHPM technology Conclusion 1/12 Literature review Own work
  • 3. Objective: geological framework/background 1. Porphyry Cu deposits 2. Skarn deposits 3. Geology/mineralization at Recsk a. Geological structural settings Darno Zone, diorite intrusive b. Exploration history: government/academics/private companies. c. Mineralization 7 different type (porphyry, skarn, etc) d. Resources exploration 0.4% Cu cut off, 779.3 Mt Lot of research done at Recsk. What changes since? Nothing new to add? Characterization of modelled deposit Introduction 3D modeling Grade tonnage CHPM technology Conclusion 2/12 Computing power, geo-software, big-data, machine learning/AI,
  • 4. 3D geological modeling Objectives: reprocess all relevant data and create a 3D model of the main geological structures at Recsk deposit Software: Paradigm GOCAD 2009.4 32 bit Input dataset for 3D model: - Drill coordinates, dip/azimuth/depth - Geological cross sections - Geophysical maps: regional (Bouguer gravity, magnetic deltaT and deltaZ), local (filtered gravity, apparent resistivity, magnetic) - Interpreted seismic sections - Surface and Pre-Cenozoic geological maps - Shuttle radar tomography mission (ASTER GDEM) data - Google satellite, topography maps Process: - Data collection/preparation/cleaning - Import/geofererence - Digitalization - Surface creation Introduction 3D modeling Grade tonnage CHPM technology Conclusion 3/12
  • 5. 3D geological modeling Results: Fault system Eocene/Triassic horizons Intrusion surface DWG files from these surfaces are available Introduction 3D modeling Grade tonnage CHPM technology Conclusion 4/12
  • 6. 3D geological modeling Results: 1. Fault system: 2. Eocene/Triassic horizons: 3. Intrusion surface: DWG f Introduction 3D modeling Grade tonnage CHPM technology Conclusion 5/12
  • 7. Grade-tonnage calculations Objective: use chemical data from RM drillings to create grade tonnage models for Cu, Mo, Zn, Au, Ag. Input data: - 134 RM drillings trajectory - Chemical dataset, including Cu, Pb, Zn, Mo, Fe, Se, S [%]; Au, Ag [g/t], core recovery, polymetallic index, - Previously created 3D models Preprocessing: Fix chemical data to EOV XZY from depth value (from-to base) Introduction 3D modeling Grade tonnage CHPM technology Conclusion 6/12
  • 8. Grade-tonnage calculations How? Creation of histograms and variograms How? Creation of SGrid and populate/interpolate it with the measurements Limitations: - cell size: 50x50x20 m (porphyry vs skarn) - no samples from the underground drillings, only RM Introduction 3D modeling Grade tonnage CHPM technology Conclusion 7/12
  • 9. Grade-tonnage calculations Results: Grade tonnage models for Cu, Mo, Au, Ag, Zn Introduction 3D modeling Grade tonnage CHPM technology Conclusion 8/12
  • 10. CHPM technology overview at Recsk Objective: give an overview on CHPM technology application at Recsk About CHPM technology - Combined Heat, Power and Metal extraction - Geothermal energy + mineral extraction - → increase financial feasibility of geothermal projects - H2020 project, CHPM2030, University of Miskolc Introduction 3D modeling Grade tonnage CHPM technology Conclusion 9/12
  • 11. CHPM technology overview at Recsk How? Literature background → 3D visualization of maps/sections → Geological model down to 3 km Introduction 3D modeling Grade tonnage CHPM technology Conclusion 10/12 Sillitoe, R. 2010: Porphyry Copper Systems. Economic Geology, v. 105, pp. 3–41
  • 12. CHPM technology overview at Recsk Resuts: - 3D model down to 3 km - Deep batholith inferred - Circumstances for mineralization are present, skarn Introduction 3D modeling Grade tonnage CHPM technology Conclusion 11/12
  • 13. Conclusions Topic 1: 3D geological modelling - surface: fault system, Eocene/Triassic horizons, intrusive Topic 2: Grade tonnage models - Cu cut-off: Cu, Mo, Au, Ag, Zn Topic 3: CHPM technology - deep mineralization is expected → Opportunity in reprocessing/3D modeling historical data Introduction 3D modeling Grade tonnage CHPM technology Conclusion 12/12
  • 14. Publication A research does not exist until it is published! (Grad. Research seminar, Prof Ferenc Mádai) Conference attendance: - 20th Congress of Hungarian Geomathematicians, 9th Congress of Croatian & Hungarian Geomathematicians “Geomathematics in multidisciplinary science - The new frontier?”. May 2017 - 8. Kőzettani és Geokémiai Vándorgyűlés. September 2017 Paper - Central European Geology, special issue Other: - Research gate: DOI: 10.13140/RG.2.2.14690.53440 - LinkedIn post and added to the profile, posted at different geomodeling groups - News item on LPRC website - Twitter post - Matarka Introduction 3D modeling Grade tonnage CHPM technology Conclusion 12+1/12
  • 15. Thank you for your attention! Jó Szerencsét! Acknowledgements to: LPRC, Jean-Jacques Royer, Éva Hartai, János Földessy, Géza Szebényi Download the full text from: https://drive.google.com/open?id=0B0rhl8Z8xj EoZEx3ek5VVnl0WkU Contact: tamas.miklovicz@lapalmacentre.eu @miktamas
  • 16. Questions from the reviewer: PhD Viktor Mádai Q1 Explanation for 4 1. The used interpolation algorithms are not explained. 2. Which result is closer to the reality. 3. Why would be fruitful to choose DSI or Kriging? Reviewer’s remarks and questions to the author: 1. The intrusive body was modelled by a surface. At the beginning of the process why 20 m was choosen as a general distance between the points on the curves?(page34) 2. Why 250 m was used between the points during the construction of faulted surface?(page 31) 3. What is the general theoretical background of densification? 4. There are no any distance scale on the maps, figures. 5. Why 200m was used as a distance criteria during the S-grid creation process? (page 36) 6. The intrusion seems to be situating on the surface (page 40 fig 3.21) 7. Although DSI is explained a bit, there are no general explanation which one is better in a given geological settings. (page 50) 8. Which ore body model is more plausible or realistic (Kriging or DSI based)? 9. Is there any scientific outline about the refilling velocity of hot water between the wells? (there will be a bulge and a depression in the waterf level.) Introduction 3D modeling Grade tonnage CHPM technology Conclusion
  • 17. Questions from the reviewer: PhD Viktor Mádai Q1 Explanation for mark 4 1. The used interpolation algorithms are not explained: page 43: DSI or Discrete smooth interpolation is a point estimator whose criteria is to minimise the local curvature (second derivative) between the data points values (coordinate, grades, properties) to be interpolated. The DSI interpolator reduces the fitting error between the sampled point (called controlling object) and the data model while keeping as objective to be as smooth as possible (GOCAD help). The advantage of this method is that it is an exact estimator and numerically stable. Kriging is an optimization technique based on regression against observed z values of surrounding data points in a neighborhood, weighted according to spatial covariance values (Bohling, 2005). In other words, kriging is a point estimator with a principle of minimizing the estimation variances (Matheron, 1962; Journel and Huijbregts 1978). Kriging in GOCAD calculates both an estimation (estimation of the value Z) and an error variance (estimate of the error). Kriging requires a variogram calculated on the dataset. To do the kriging, the calculated empirical variogram has to be replaced with a “synthetic” fitted theoretical variogram. 2. Which result is closer to the reality: page 47 One of the advantage of kriging is that it considers the spatial variability of the elements by using variogram → kriging 3. Why would be fruitful to choose DSI or Kriging? Page 47 Introduction 3D modeling Grade tonnage CHPM technology Conclusion
  • 18. Questions from the reviewer: PhD Viktor Mádai Q1 Explanation for 4 1. The used interpolation algorithms are not explained. 2. Which result is closer to the reality. 3. Why would be fruitful to choose DSI or Kriging? Reviewer’s remarks and questions to the author: 1. The intrusive body was modelled by a surface. At the beginning of the process why 20 m was choosen as a general distance between the points on the curves?(page34) 2. Why 250 m was used between the points during the construction of faulted surface?(page 31) 3. What is the general theoretical background of densification? 4. There are no any distance scale on the maps, figures. 5. Why 200m was used as a distance criteria during the S-grid creation process? (page 36) 6. The intrusion seems to be situating on the surface (page 40 fig 3.21) 7. Although DSI is explained a bit, there are no general explanation which one is better in a given geological settings. (page 50) 8. Which ore body model is more plausible or realistic (Kriging or DSI based)? 9. Is there any scientific outline about the refilling velocity of hot water between the wells? (there will be a bulge and a depression in the waterf level.) Introduction 3D modeling Grade tonnage CHPM technology Conclusion
  • 19. Questions from the reviewer: Dr. Szentpéteri Krisztián My questions to the author: 1) Based on the geological modelling exercise, where would the author target; 1) exploration drilling that would the most potentially expand the resources and 2) infill drilling that would the most potentially enhance the quality and confidence of the resource modelling? 2) Based on the variogram analysis how many ore types can the author recognize, what they are and where they are located in the 3D modelling space? 3) Has the author ever performed the following exercise: looking at only the assay data, without anything else (no sections, no surface, no geophysics) purely the points hanging in the empty 3D space? 4) What does the author think; what will be the most useful geological data for modelling Recsk Deep skarn mineralization and why? Introduction 3D modeling Grade tonnage CHPM technology Conclusion Q2
  • 20. Questions from the reviewer: Dr. Szentpéteri Krisztián 2) Based on the variogram analysis how many ore types can the author recognize, what they are and where they are located in the 3D modelling space? At least 3 structures can be distinguished based on sill/nugget of horizontal variograms: - 100 m: Au, - 350 m: Cu, Zn, Mo - ~700 m: Pb, Ag Mo Cu Introduction 3D modeling Grade tonnage CHPM technology Conclusion Q2
  • 21. CHPM technology overview at Recsk Introduction 3D modeling Grade tonnage CHPM technology Conclusion 10/12
  • 22. CHPM technology overview at Recsk Introduction 3D modeling Grade tonnage CHPM technology Conclusion 11/12
  • 23. 3D geological modeling Introduction 3D modeling Grade tonnage CHPM technology Conclusion 41/12
  • 24. CHPM technology overview at Recsk Introduction 3D modeling Grade tonnage CHPM technology Conclusion 9/12