Post on 25-Feb-2016
description
Presented by: Dr. Nguyen Thanh Long
PresentationBAUXITE BLOCK MODELING AND RESERVE ESTIMATION
FOR THE WESTERN PART OF TAN RAI MINE
MINISTRY OF NATURAL RESOURCES AND ENVIRONMENT
CONTENTS
1
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.
INTRODUCTION
2
– The boreholes grid in the area in which the C1 bauxite mineral reserve level was set up 200m-distance.
– The boreholes grid in the area in which the C1 bauxite mineral reserve level was set up 100m-distance.
INTRODUCTION
3
C1 level
B level
The bauxite reserves of Tan Rai mine were estimated according 2 different mineral reserve levels i.e., B and C1.
B: 198 drillholesC1: 553 drillholes
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
INTRODUCTION
4
Creating drillhole file
Viewing drillholes in 3D
Creating wireframe modeling for ore bodies
Creating strings of ore body in parallel sections
Creating BLOCK MODEL for the ore bodies
Grade interpolation
The results of reserve estimation and report
The reserves estimation
The grade interpolation results
Linking all strings in parallel sections to build the blank wireframe
PROCESS FOR MINERAL RESERVE ESTIMATION
IN DATAMINE SOFTWARE
5
Data preparation
collars.txt X, Y, Z coordinates of the drillhole collarssurveys.txt Downhole measurements of drillhole azimuth and inclinationassays.txt Mineral assays of drillhole samplesgeology.txt Drillhole sample lithology logspoint.txt Information about terrain surface: rivers, roads, contour, etc…
DATA PREPARATION
6
Principle data in Datamine
Data structure of collars, surveys, assays, geology, and point files
CollarsCollars GeologyGeology
SurveysSurveysAssaysAssays
X, Y, Z coordinates of the drillhole collars
Mineral assays of drillhole samples
Drillhole sample lithology logs
Downhole measurements of drillhole azimuth and inclination
Terrain surface (contour, river, road, ...)
Drillhole file
CREATING DRILLHOLE FILE
7
Datamine provides several different ways of drillhole view in the 2D or 3D for several purposes
8
VIEWING DRILLHOLES IN 3D
553 drillholes
198 drillholes
9
CREATING STRINGS OF ALL ORE BODIES (B LEVEL)
IN PARALLEL SECTIONS (35-45)Profile 35Profile 35Profile 36Profile 36Profile 37Profile 37Profile 38Profile 38Profile 39Profile 39Profile 40Profile 40Profile 41Profile 41Profile 42Profile 42Profile 43Profile 43Profile 44Profile 44
Profile 45Profile 45
10
CREATING STRINGS OF ALL ORE BODIES (C1 LEVEL)
IN PARALLEL SECTIONS (1-69)
Profile 1Profile 1Profile 3Profile 3Profile 5Profile 5Profile 7Profile 7Profile 9Profile 9Profile 11Profile 11
11
LINKING STRINGS IN PARALLEL SECTIONS TO CREATE THE BLANK WIREFRAME (C1 LEVEL)
12
LINKING STRINGS IN PARALLEL SECTIONS TO CREATE THE BLANK WIREFRAME (B LEVEL)
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
13
CREATING BLOCK MODEL FOR THE ORE BODIES
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 )
16
GRADE INTERPOLATION
Field Number DescriptionSREFNUM Search volume reference numberSMETHOD 2 Search volume method (1 = 3D rectangle, 2 = ellipsoid)SDIST1 300 Length of axis 1, initially in X direction prior to rotationSDIST2 300 Length of axis 2, initially in Y direction prior to rotationSDIST3 50 Length of axis 3, initially in Z direction prior to rotationSANGLE1 0 First rotation angle, defining orientation of search ellipsoidSANGLE2 0 Second rotation angle, defining orientation of search ellipsoidSANGLE3 0 Third rotation angle, defining orientation of search ellipsoidSAXIS1 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 volumeMAXNUM1 20 Maximum number of samples for first dynamic search volumeSVOLFAC2 0 Axis multiplying factor for second dynamic search volumeMINNUM2 1 Minimum number of samples for second dynamic search volumeMAXNUM2 20 Maximum number of samples for second dynamic search volumeSVOLFAC3 0 Axis multiplying factor for third dynamic search volumeMINNUM3 1 Minimum number of samples for third dynamic search volumeMAXNUM3 20 Maximum number of samples for third dynamic search volumeOCTMETH 0 Octant definition method (0 = do not use octants, 1 = use octants)MINOCT Minimum number of octants to be filledMINPEROC Minimum number of samples in an octantMAXPEROC Maximum number of samples in an octantMAXKEY Maximum number of samples with same key field value
17
Field Number DescriptionSREFNUM Search volume reference numberSMETHOD 2 Search volume method (1 = 3D rectangle, 2 = ellipsoid)
SDIST1 150 Length of axis 1, initially in X direction prior to rotationSDIST2 150 Length of axis 2, initially in Y direction prior to rotationSDIST3 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 Maximum number of samples in an octantMAXKEY Maximum number of samples with same key field value
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 )
GRADE INTERPOLATION
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
THE RESULTS OF RESERVE ESTIMATION AND
REPORT
18
CONCLUSIONS
19
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.
20