Linear Referencing and Dynamic Segmentation

for Mining Borehole Management and Analysis

Lucas Donny Setijadji

Department of GeologyGadjah Mada University

Indonesia

lucas_donny@yahoo.com

Workflow of GIS solution for mining data management and analysis

Flat files

• Personal geodatabase (MS Access)• Enterprise Geodatabase (Oracle, DB2, SQL Server)

GeodatabaseGeodatabase

ArcGISArcGISOther modeling Other modeling packagepackage

ArcGIS ArcGIS extensionsextensions

• Solid 3D modeling• Resource estimation

• Geostatistical Analyst• 3DAnalyst• Spatial Analyst

Using ArcGIS, mining data files

such as bore holes can now

be managed using a single

and integrated DBMS.

Intelligent data model within

ESRI geodatabase will allow data input

once for many times of usages for many types of applications

Personal geodatabase direct access

Enterprise geodatabase through ArcSDE

ArcSDEArcSDE

Understanding Linear Referencing

, MD

Borehole data sets are modeled as 3D lines

(X,Y,Z) with a measure value (M).

This allows physical objects, such as tests, core logging, and rock assays to be modeled

as events that occur somewhere along the

boreholes.

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top_depth

base_depthx

a, y

a, z

a, MD

a

xTD

, yTD

, zTD

, MDTD

xn, y

n, z

n, MD

n

xb, y

b, z

b b

?

?

Geology Data Model (Grise and Brodaric, 2003)

Borehole data model is

available as modules

within ArcGIS Desktop

Geology Data Model

System requirements:• ArcGIS of ArcEditor or ArcInfo licence• Full implementation of linear referencing

system (LRS) is by ArcGIS 8.3 release• Route events geoprocessing is only

available at ArcInfo licence• Geology Data Model as template

Case study:• Evaluation drilling campaign for porphyry-

related skarn Cu-Au deposit• Done by an intern research in Redlands, CA• Data courtesy: Freeport Indonesia

Collar

Bottom

Building the routes

Uploading business tables

Geodatabase

Personal geodatabase

is saved as MS Access.

Don’t see it with Access,

But…..

… use ArcCatalog

What can we do with routes?1. Create route events

Locations of HoleAssay

e.g., HoleAssay along the boreholes

2. Find a route segment

3. Identify a route

4. Classify a route event

e.g.,Cu assay values

5. Route events queries

6. Route events geoprocessing

7. 3D Display with ArcScene and creating animation

8. Extracting elevation

NO Z VALUES YET…..

Populate z values using Calculate Values tool

ELEVATIONS

9. Building surfaces with Geostatistical Analyst

Data exploration

Building the surface

Fitting semivariogram model

10. Multi surfaces 3D display

11. Support for solid 3D modeling through extension

After all, your data sets are fully georeferenced,support direct integration with other spatial data sets

Large Scale:1:1,500

Only assays and

surfaces are active

Zoom out:1:15,000

Boreholes and route

events are active

Zoom out:1:75,000

Only hole collars

appear, but now

geologic map and

mineral deposit

database are

activated

Zoom out:1:10,000,000

Only regional geologic map and

mineral deposit

database are active