The classification of coal resources and reserves is a grouping efforts and resources of coal reserves based on geological confidence and economic feasibility. Several classification refers to the SNI 13-5014-1998 (Indonesian National Standard) and Standards Australia
Coal resources (coal resources) are part of the coal deposits are expected to be utilized. These coal resources according to SNI (Indonesian National Standard) is divided into classes of resources based on geological confidence level is qualitatively determined by geological conditions / level of complexity and quantitatively by the distance of a point of information.
1. Hypothetical Coal Resource
The amount of coal in the investigation or part of the investigation, which is calculated based
on data that meets the requirements defined for the survey stage of review.
2. Inferred Coal Resources The amount of coal in the investigation or part of the investigation,
which is calculated based on data that meets the requirements set for prospection stage.
3. Indicated Coal Resources
The amount of coal in the investigation or part of the investigation, which is calculated based
on data that meets the requirements set for the preliminary exploration stage
4. Measured Coal Resources
The number of coal in the area or part of the investigation area, which is
calculated based on the data that meets the requirements set for the stage of detailed
exploration.
Simplified Geological Conditions
Coal resources (coal resources) are part of the coal deposits are expected to be utilized. These coal resources according to SNI (Indonesian National Standard) is divided into classes of resources based on geological confidence level is qualitatively determined by geological conditions / level of complexity and quantitatively by the distance of a point of information.
1. Hypothetical Coal Resource
The amount of coal in the investigation or part of the investigation, which is calculated based
on data that meets the requirements defined for the survey stage of review.
2. Inferred Coal Resources The amount of coal in the investigation or part of the investigation,
which is calculated based on data that meets the requirements set for prospection stage.
3. Indicated Coal Resources
The amount of coal in the investigation or part of the investigation, which is calculated based
on data that meets the requirements set for the preliminary exploration stage
4. Measured Coal Resources
The number of coal in the area or part of the investigation area, which is
calculated based on the data that meets the requirements set for the stage of detailed
exploration.
Simplified Geological Conditions
- Deposits of coal are generally not affected by tectonic activity such as faults, folds, and intrusions.
- Layers of coal in general is flat, laterally continuous up to a thousand meters, and almost did not have the branching.
- The thickness of coal layer laterally and quality do not show significant variations.
- Deposits of coal to a certain extent has experienced the effects of tectonic deformation.
- In some places, igneous intrusion affect the layer structure and quality of coal.
- Distribution of branching coal can still be followed up hundreds of meters.
- Generally have experienced intense tectonic deformation.
- The shift and perlipatan result of tectonic activity makes the hard coal layers correlated,
- Strong Perlipatan also resulted in a steep slope layer
- Distribution of coal layers are laterally limited and can only be followed up to tens of meters.
