Calculation of Resource and Coal Reserve
Classification of natural resource and coal reserve geologically determine the borehole distance or coal outcrops that are measurable in thickness.
This clarification expresses the accuracy, precision and geology confidence.
Based on these criterias, classifications of resources and coal reserves are divided into:
- Hypothetical Coal Resource ais coals within a investigation areas, which potential is estimated based on initial geological data that fulfill conditions in the initial investigation. If exploration states that the hypothetical coal resource is true and stating enough information on the quality, quantity and quality range, then it will be classified as Identified Resources.
Inferred Coal Resource is the quantity of coals in the investigation area, calculated based on the data that fulfills several conditions that were set for the prospective investigation phase.
These natural resource areas are determined based on the thickness projection, cover soil, layers and quality of the data from the drill point and or coal outcrops based on geological evidence in the radius of 1.2 km – 4.8 km. Observation point has a pretty far range hence valuing from the natural resource is not dependable.
Indicated Coal Resource is the amount of coals in the investigation area, measured based on data that has fulfilled conditions that were determined on initial exploration phase.
This natural resource is determined from thickness projection and covering soil, rank and data quality from drill point and or coal outcrops based on geological evidence from the radius of 0.4 km – 1.2 km. Density and quality of observation point is enough to have a realistic interpretation from thickness, quality, depth and amount of coals' onsite.
Measure Coal Resource is the number of coal in the investigation area, calculated based on data that qualifies to the requirements set in the detailed exploration phase.This resource are is determined from the thickness projection and covering soil, layers and quality of data from the measuring point and sampling based on the geological evidence in the radius of 0.4 km. Density and quality of observation is enough to be depended upon in doing interpretations of coal thickness, quality, depth and quantity of coals onsite.