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VIETNAM INSTITUTE OF GEOSCIENCES AND MINERAL RESOURCES

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. VIETNAM INSTITUTE OF GEOSCIENCES AND MINERAL RESOURCES. CONTENTS. INTRODUCTION.

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VIETNAM INSTITUTE OF GEOSCIENCES AND MINERAL RESOURCES

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  1. 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 VIETNAM INSTITUTE OF GEOSCIENCES AND MINERAL RESOURCES

  2. CONTENTS

  3. 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.

  4. 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 200m-distance. • The boreholes grid in the area in which the C1 bauxite mineral reserve level was set up 100m-distance. B: 198 drillholes C1: 553 drillholes C1 level  B level

  5. 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

  6. PROCESS FOR MINERAL RESERVE ESTIMATION IN DATAMINE SOFTWARE Data preparation Grade interpolation Creating drillhole file Viewing drillholes in 3D The grade interpolation results Creating wireframe modeling for ore bodies Creating BLOCK MODEL for the ore bodies The reserves estimation • Creating strings of ore body in parallel sections The results of reserve estimation and report • Linking all strings in parallel sections to build the blank wireframe

  7. DATA PREPARATION • Principle data in Datamine • Data structure of collars, surveys, assays, geology, and point files Geology Collars Assays Surveys

  8. X, Y, Z coordinates of the drillhole collars Mineral assays of drillhole samples Downhole measurements of drillhole azimuth and inclination Drillhole sample lithology logs Terrain surface (contour, river, road, ...) Drillhole file CREATING DRILLHOLE FILE

  9. VIEWING DRILLHOLES IN 3D 553 drillholes Datamine provides several different ways of drillhole view in the 2D or 3D for several purposes 198 drillholes

  10. CREATING STRINGS OF ALL ORE BODIES (B LEVEL) IN PARALLEL SECTIONS (35-45) Profile 35 Profile 36 Profile 45 Profile 39 Profile 44 Profile 42 Profile 43 Profile 40 Profile 41 Profile 38 Profile 37

  11. CREATING STRINGS OF ALL ORE BODIES (C1 LEVEL) IN PARALLEL SECTIONS (1-69) Profile 1 Profile 5 Profile 3 Profile 11 Profile 7 Profile 11 Profile 9

  12. LINKING STRINGS IN PARALLEL SECTIONS TO CREATE THE BLANK WIREFRAME (C1 LEVEL)

  13. LINKING STRINGS IN PARALLEL SECTIONS TO CREATE THE BLANK WIREFRAME (B LEVEL)

  14. 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

  15. 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 )

  16. 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 )

  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

  18. CONCLUSIONS The results provide a visual view in 3D of the ore bodies in the study area. 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. The result of this research is also a basement for management of mineral resources of the local administrative.

  19. THANK YOU VERY MUCH FOR YOUR ATTENTION! VT-TĐC

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