Transcript Presentation BAUXITE BLOCK MODELING AND RESERVE ESTIMATION FOR THE WESTERN PART OF TAN RAI MINE Presented by: Dr.

Presentation
BAUXITE BLOCK MODELING AND RESERVE ESTIMATION
FOR THE WESTERN PART OF TAN RAI MINE
Presented by: Dr. Nguyen Thanh Long
MINISTRY OF NATURAL RESOURCES AND ENVIRONMENT
CONTENTS
INTRODUCTION
BAUXITE RESERVE ESTIMATIONS AND RESULTS FOR
WESTERN PART OF TAN RAI MINE IN BAO LAM
DISTRICT, LAM DONG PROVINCE, VIETNAM
CONCLUSIONS
1
INTRODUCTION
 Tan Rai bauxite mine, about 42 km2, locates in 3 communes: Loc
Thang, Loc Phu and Loc Ngai in Bao Lam District, Lam Dong
Province, 20km NE direction from Bao Loc town. It has
geographical coordinates:
11038’08’’ - 11041’56’’ N
107049’54’’ - 107053’12’’ E
 In this research, the western part of Tan Rai mining is
concentrated for bauxite ore modeling and reserve estimation.
2
INTRODUCTION
The bauxite reserves of Tan Rai mine were estimated according 2 different
mineral reserve levels i.e., B and C1.
– The boreholes grid in the
area in which the C1
bauxite mineral reserve
level was set up 200mdistance.
– The boreholes grid in the
area in which the C1
bauxite mineral reserve
level was set up 100mdistance.
B: 198 drillholes
C1: 553 drillholes
C1 level
 B level
3
INTRODUCTION
Bauxite mineral reserve criteria for estimation
– The bauxite mineral reserve of Tan Rai bauxite mining is
calculated according to decision 22/QĐ-HĐĐGTLKS
which Chairman of Mineral Reserve Assessment
Committee approved April 13, 2000.
That are:
Al2O3 volume in fined ore  40%
- ratio of grain size +1 mm  20%.
- Silica module ( Al2O3/SiO2) for the fined ore  7.0
The thickness of industrial ore is at least 1.0 m
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PROCESS FOR MINERAL RESERVE ESTIMATION
IN DATAMINE SOFTWARE
Data preparation
Creating drillhole file
Grade interpolation
Viewing drillholes in 3D
Creating wireframe
modeling for ore bodies
The grade interpolation
results
Creating BLOCK MODEL
for the ore bodies
The reserves estimation
 Creating strings of ore
body in parallel sections
 Linking all strings in
parallel sections to build
the blank wireframe
The results of reserve
estimation and report
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DATA PREPARATION
Principle data in Datamine
collars.txt
surveys.txt
assays.txt
geology.txt
point.txt
X, Y, Z coordinates of the drillhole collars
Downhole measurements of drillhole azimuth and inclination
Mineral assays of drillhole samples
Drillhole sample lithology logs
Information about terrain surface: rivers, roads, contour, etc…
 Data structure of collars, surveys, assays, geology, and point files
Collars
Geolog
y
Assays
Surveys
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CREATING DRILLHOLE FILE
X, Y, Z coordinates of
the drillhole collars
Drillhole sample
lithology logs
Mineral assays of
drillhole samples
Downhole measurements
of drillhole azimuth and
inclination
Terrain surface (contour,
river, road, ...)
Drillhole file
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VIEWING DRILLHOLES IN 3D
Datamine provides several different ways of drillhole view in
the 2D or 3D for several purposes
553 drillholes
198 drillholes
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CREATING STRINGS OF ALL ORE BODIES (B LEVEL)
IN PARALLEL SECTIONS (35-45)
Profile 43
44
Profile
Profile
42
Profile
Profile
41
40
Profile
39
35
Profile37
36
Profile
38
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CREATING STRINGS OF ALL ORE BODIES (C1 LEVEL)
IN PARALLEL SECTIONS (1-69)
Profile39711
Profile
15
Profile
10
LINKING STRINGS IN PARALLEL SECTIONS TO
CREATE THE BLANK WIREFRAME (C1 LEVEL)
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LINKING STRINGS IN PARALLEL SECTIONS TO
CREATE THE BLANK WIREFRAME (B LEVEL)
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CREATING BLOCK MODEL FOR THE ORE BODIES
Define block (PROTOM )
– Identify block coordinates (X,Y,Z):
B: (482400, 1288296, 830)
C1: (480975, 1286976, 788)
– Define cellsize by X,Y,Z axis:
B: (10, 10, 2)
C1: (20, 20, 2)
– Calculate the number of cell by X,Y,Z axis :
– B: (242, 230, 35)
C1: (253, 353, 83)
Define and create wirefill modeling
– Choose wirefill definition (Protom)
– Define min and max cellsize by X,Y,Z axis
– Choose wirefill modeling
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GRADE INTERPOLATION
The parameters is used to the grade interpolation of Al2O3, silica module
and ratio of grain size +1 mm of bauxite fined ore (for C1 level )
Field
SREFNUM
SMETHOD
SDIST1
SDIST2
SDIST3
SANGLE1
SANGLE2
SANGLE3
SAXIS1
SAXIS2
SAXIS3
MINNUM1
MAXNUM1
SVOLFAC2
MINNUM2
MAXNUM2
SVOLFAC3
MINNUM3
MAXNUM3
OCTMETH
MINOCT
MINPEROC
MAXPEROC
MAXKEY
Number
2
300
300
50
0
0
0
3
1
3
1
20
0
1
20
0
1
20
0
Description
Search volume reference number
Search volume method (1 = 3D rectangle, 2 = ellipsoid)
Length of axis 1, initially in X direction prior to rotation
Length of axis 2, initially in Y direction prior to rotation
Length of axis 3, initially in Z direction prior to rotation
First rotation angle, defining orientation of search ellipsoid
Second rotation angle, defining orientation of search ellipsoid
Third rotation angle, defining orientation of search ellipsoid
First rotation axis (1=X axis, 2=Y axis, 3=Z axis)
Second rotation axis (1=X axis, 2=Y axis, 3=Z axis)
Third rotation axis (1=X axis, 2=Y axis, 3=Z axis)
Minimum number of samples for first dynamic search volume
Maximum number of samples for first dynamic search volume
Axis multiplying factor for second dynamic search volume
Minimum number of samples for second dynamic search volume
Maximum number of samples for second dynamic search volume
Axis multiplying factor for third dynamic search volume
Minimum number of samples for third dynamic search volume
Maximum number of samples for third dynamic search volume
Octant definition method (0 = do not use octants, 1 = use octants)
Minimum number of octants to be filled
Minimum number of samples in an octant
Maximum number of samples in an octant
Maximum number of samples with same key field value
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GRADE INTERPOLATION
The parameters is
used to the grade
interpolation
of
Al2O3, silica module
and ratio of grain size
+1 mm of bauxite
fined ore (for B level )
Field
SREFNUM
Number
SMETHOD
2
Description
Search volume reference number
Search volume method (1 = 3D rectangle, 2 = ellipsoid)
SDIST1
150
Length of axis 1, initially in X direction prior to rotation
SDIST2
150
Length of axis 2, initially in Y direction prior to rotation
SDIST3
50
Length of axis 3, initially in Z direction prior to rotation
SANGLE1
0
First rotation angle, defining orientation of search ellipsoid
SANGLE2
0
Second rotation angle, defining orientation of search ellipsoid
SANGLE3
0
Third rotation angle, defining orientation of search ellipsoid
SAXIS1
3
First rotation axis (1=X axis, 2=Y axis, 3=Z axis)
SAXIS2
1
Second rotation axis (1=X axis, 2=Y axis, 3=Z axis)
SAXIS3
3
Third rotation axis (1=X axis, 2=Y axis, 3=Z axis)
MINNUM1
1
Minimum number of samples for first dynamic search volume
MAXNUM1
20
Maximum number of samples for first dynamic search volume
SVOLFAC2
0
Axis multiplying factor for second dynamic search volume
MINNUM2
1
Minimum number of samples for second dynamic search volume
MAXNUM2
20
Maximum number of samples for second dynamic search volume
SVOLFAC3
0
Axis multiplying factor for third dynamic search volume
MINNUM3
1
Minimum number of samples for third dynamic search volume
MAXNUM3
20
Maximum number of samples for third dynamic search volume
OCTMETH
0
Octant definition method (0 = do not use octants, 1 = use octants)
MINOCT
Minimum number of octants to be filled
MINPEROC
Minimum number of samples in an octant
MAXPEROC
MAXKEY
Maximum number of samples in an octant
Maximum number of samples with same key field value
17
THE RESULTS OF RESERVE ESTIMATION AND
REPORT
B level reserve estimation:
– Total bauxite ore volume: 7,696,097m3
– Bauxite weight unit average of all ore bodies: 1.71 (ton/m3)
– Bauxite crude ore reserve: 13,160,330 ton
– Al2O3 grade average in ore bodies: 47.679%
– Silica module average value in ore bodies: 24.14%
– Average value of ratio of grain size +1 mm: 32.94%
– The fined ore reserve: 4335013 ton
C1 level reserve estimation
– Bauxite ore bodies volume: 867,180,300m3
– Bauxite weight unit average of all ore bodies : 1.71 (ton/m3)
– Bauxite crude ore reserve: 148,288,300 ton
– Al2O3 grade average in ore bodies : 47.57%
– Silica module average value in ore bodies : 24.44%
– Average value of ratio of grain size +1 mm: 34.62%
– The fined ore reserve : 51,337,409 ton
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CONCLUSIONS
1. The results provide a visual view in 3D of the ore
bodies in the study area.
2. The bauxite reserve estimations were done for western
part of Tan Rai mine in Bao Lam district, Lam Dong
province, Vietnam. It’s very helpful for designing and
exploiting in the future in this area.
3. The result of this research is also a basement for
management of mineral resources of the local
administrative.
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