CHARACTERISTICS OF ALLUVIAL TIN AND DRILL SPACING OPTIMIZATION ANALYSIS IN DETERMINING ALLUVIAL TIN RESOURCES IN REGION X BANGKA BELITUNG
The research area is in area X of Bangka Island, Bangka Belitung Islands Province. Bangka Island is an island that is traversed by the main granite route of Southeast Asia, with a high level of weathering making this island the most productive alluvial tin producer in the world. With different ty...
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| Format: | Final Project |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/82088 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The research area is in area X of Bangka Island, Bangka Belitung Islands Province.
Bangka Island is an island that is traversed by the main granite route of Southeast
Asia, with a high level of weathering making this island the most productive alluvial
tin producer in the world. With different types of alluvial deposition, it is necessary
to characterize alluvial tin deposition which is the basis for optimizing drill hole
spacing to determine the classification of resource blocks in the research area.
In the research area, 279 drillhole were analysed. Placer layers in the research area
are modelled based on grain size in three dimensions to determine the distribution
of layer types which is the basis for determining facies associations. Facies
associations in the research area are modelled in two dimensions and three
dimensions to determine the control of tin distribution. The tin deposits in the
research area have a mincan deposit type with mineralogical characteristics subrounded.
The previous characteristics are the basis for determining drillhole
spacing optimization.
The method used in drill hole spacing optimization is a geostatistical approach
using the Global Estimation Variance (GEV) method to calculate relative errors.
The distribution of drill data in the research was treated with spatial clustering
based on the average spacing of existing drill holes and the characteristics of
alluvial tin into 3 areas. The optimum spacing representing alluvial tin in the
research area is associated with the relative error adjusting each error with a
classification of 0-20% for measured resources is 70-100m, 20-35% for indicated
resources is 120-150m, and 35-55% for inferred resources is >170m. As a
comparison, alluvial tin resource blocks were determined using kriging efficiency
from the results of ordinary kriging interpolation. It was found that the resource
block area in drilling hole spacing optimization was 1,828,508 m2, while the kriging
efficiency was only around 1,483,280 m2. |
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