Leapfrog advances and concerns in Antamina, Peru.pdf

Artículo que describe los avances obtenidos al implementar Leapfrog en el modelamiento geológico de Antamina

Engineering

Leapfrog advances and concerns in
Antamina, Peru
Angel Rios
Compañía Minera Antamina
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Mine Location
The mine is located
approximately 240 Km N
of Lima. Access is via
public roads and the last
part on a newly
constructed mine road.
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Introduction
1. Antamina is a complex skarn of copper, zinc, silver, molybdenum
and bismuth formed by the intrusion of a quartz monzonite stock
in limestone. The dimensions of the deposit are about 3 Km long
in a NE direction by 1.5 km wide.
2. Geological model built in Leapfrog is used for Resource
Estimation for Long Term Planning updated every year.
3. 171 rocks logged by geologists (ROCKCODE).
4. 35 rock groups (ROCKCODE_NUMEQ) inside Acquire.
5. 20 geological units in blocks and composites.
6. High variability in grades require the use of “original” logging
width. Geological wireframes consider widths from 1.5m inclusive.
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Geology cross section
Description
Geological
Unit
Color
Intrusive 1
Intrusive out Antamina Skarn 2
Limestone 10
Hornfels 13
Diopside Hornfels 14
Marble 16
Diopside Marble 19
Brown Endoskarn 20
Pink Endoskarn 22
Diopside Pink Endoskarn 23
Brown green Exoskarn 31
Green Exoskarn 32
Diopside Exoskarn 34
Diopside Exoskarnout Antamina Skarn 35
Brown Wollastonite Exoskarn 36
Green Wollastonite Exoskarn 37
Enriched Zone in BrownEndoskarn 50
Enriched Zone in Exoskarn 51
Enriched Zone in Pink Endoskarn 52
Enriched Zone in Intrusive 53
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Antamina Geological Model
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Workflow Geological Modeling
Leapfrog Mining
Projects
Leapfrog Geo
Project
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Leapfrog Mining: Compositing
This step is not possible in Geo because we can not consider more than one
unit in the “Include window” and median filter algorithm does not exist
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Leapfrog Mining: Domains
• Same rock
logged, divided
spatially by
domains
according to
geological
interpretation.
• Domains are
used for
selecting data
for interpolation
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Leapfrog Mining: Edition with
polylines
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Leapfrog Mining: Interpolation using
Structural Trends
Complex Geometry
must use structural
trend
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Leapfrog Mining: Interpolation using
Structural Trends
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Leapfrog Mining: Interpolation using
Structural Trends
High surface
resolution
required
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Meshes interpolated from Leapfrog
Mining
1. Hardware used: 2 PCs, CPU 3.7Ghz, 16GB RAM, SSD, 2GB
Video.
2. 22 meshes interpolated using structural trend. Multires from 8 to 4
used.
3. Volume filter applied to meshes.
4. 70 meshes interpolated as veins.
5. All meshes edited with polylines.
6. Biggest mesh around 1 million vertices, 2.5 million triangles, 30
runs previous to final. Every run lasts 4 hours.
7. Meshes snapped to contact points.
8. Some cases self intersections or error message. (rerun and wait
hours).
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Leapfrog Geo: Boolean operations
Importing meshes Inserting Imported meshes into Geological Models
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Advances
1. Less misclassification against explicit modeling.
2. Dramatic reduction of time: 5 weeks with 1 geologist against 12
weeks with 6 geologists in explicit modeling.
3. Best interpretation at using real 3D visualization.
4. Structural trends can be used for building wireframes in complex
deposits.
5. Flexibility (new deterministic models can be performed).
6. Reduction of time and better decisions in planning holes.
7. Environmentally friendly. No more printed sections for
interpretation.
8. Better communication of Geological Model (Scenes and videos).
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Concerns
1. Need of more speed for interpolations.
2. Different algorithm between Mining and Geo.
3. Improvement of interpolation with structural trend beyond data
(artifacts).
4. Compositing algorithms (median filter) absent in Geo.
5. Domains absent in Geo.
6. 3D polylines in Geo are different to those in Mining.
7. Geo does not allow change variogram parameters for snapping
meshes to points.
8. Changes in wireframes beyond new data is added.
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? Questions
Av. El Derby 055, Torre 1, Oficina 801. Santiago de Surco. Lima - Perú
Telf. (51-1) 217-3000 Fax (51-1) 217-3095
www.antamina.com
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