Coal Deposit is sediment containing result of accumulation of organic material is coming from plant pickings that has passed lithification process for forms coal seam. The material has experienced compaction, chemical change and metamorphosis process by accentual and hot improvement during period geology.
Organic material which implied in coal seam has fibre is more from 50% or the organic material volume, including congenital inherent moisture, more than 70%.
1. Coal Resources
Coal Resources is part of sediment of embers stone expected earns exploited. This embers stone resource divided into resource class based on level of confidence of geology determined qualitatively by condition geology and quantitatively by distance point of information. Source this energy?power can increase to become reserve if after done by Feasibility study expressed competent.
2. Coal Reserves
Coal Reserves is part of embers stone resource which has been known dimension, as of amount swampy forest, and quality, which at the time of Feasibility study expressed is competent to be mined.
3. Geological Assurance
Geological Assurance is level of trust about existence of embers stone which determined by level of information point density of geology covering thickness, inclination of layer, form, correlation of coal seam, as of swampy forest. structure, soil;land;ground thickness cover?conclusion, amount and quality as according to level of investigation.
4. Feasibility Study
Feasibility Study is a study detail to all aspects having the character of technical and economic from a plan project of mining. Result from this study can be applied as basis for determines decision of investment and as document which has commercial value (bankable document) for project financing. This study covers all economics aspect, mining, processing, marketing, policy government, regulation, environmental and social. projection of Budget cost must be accurate and was not required again investigation of continuation for investment decision. Information at this study covers reserve number based at result of exploration detail, examination of technical model, and calculation operating expenses.
5. As General As Thickness
Thickness of coal seam is aparting short between rooves and stone layer floor embers yng measured at surface outcrop, borehole, and observation at active shaft mine (working underground mining). Coal seam often, though not always, consisted of sub-layer or layer compound yielded by apart of layer or layer merger. Layer sub
this has each characteristic sometime dissociated by dirt partings with thickness varying.
6. Brownian of Coal
Brownian of Coalis conspecific of lowest embers stone of rank, haves the character of slack, easy to in crumpling up, contains high water content (10-70%), consisted of brownian soft of coal and lignitic or brownian hard of coal showing wood structure. Value calorie 7000 kalori/gram (dry ash free-ASTM).
7. Hard Coal
Hard Coal is all embers stone types which its(the rank is higher from brownian of coal, haves the character of harder, not easy to crumpled up, compact, contains water content low relative, generally wood structure is not seen again, and relatively resistant to damage of physical of at the time of coal handling. Calorific value > 7000 kalori/gram (dry ash free - ASTM).
8. Exploration Phase
Exploration Phase is executed through four phases, namely survey evaluation, prospecting, exploration of antecedent, and exploration detail. Purpose of investigation this geology is to identify there is, existence, measure, form, as of swampy forest, amount, and quality of an sediment of embers stone as analysis base
possibility that doing of investment. The investigation phase determines storey confidence of geology and embers stone resource class yielded. Counting of embers stone resource is done with various methods between it polygon, cutting, isopach, inverse distance, geo statistic, and others.
9. Reconcaissance
Evaluation survey is exploration phase of earliest embers stone with a purpose to
identifies areas that is in geology contains sediment of embers stone having potency to be investigated furthermore and collects information about condition of geography, arranges land use, and until area. Activity, inter alia, study geology regional, interpretation of remote sensing, other indirect method, and inspection of antecedent field using elementary map with scale at least 1 : 100000.
10. Prospecting
This exploration phase meant to limit area as of sediment swampy forest of embers stone which will become exploration target hereinafter. Activity done at phase this, between it, mapping of geology with minimum scale of 1 : 50000, measurement
stratigraphic, making of trenching, making of test pit, scout drilling, example, and analysis. Indirect exploration method, like investigation of geophysics, enforceable if assumed to need.
11. Preliminary Exploration
This exploration phase meant to know initial picture form of three dimensions sediment of embers stone covering layer thickness, form, correlation, as of swampy forest, structure, amount and quality. Activity done by inter alia, mapping of geology with scale 1 : 10000, topography mapping, boring with distance matching with condition geology, geophysics logging, making of trenching, and super example. Initial study of geotechnical and geohydrology starts earning done.
12. Detailed Exploration
This exploration phase meant to know amount and quality of and model 3 dimension sediment of embers stone more detailed. Activity that is must be done is mapping of geology and topography with minimum scale of 1 : 2000, boring and example done with distance matching with condition of geology, geophysics logging, and study geohydrology and geotechnical. At this phase need to be done investigation of antecedent of embers stone, rock , water and other regarded as needing as component of environmental study related to mining activity plan submitted.
13. Resource Class and Reserve
a. Hypothetical Coal Resource
Hypothetical Coal Resource is number of embers stones in investigation area or part of investigation area, what calculated based on data fulfilling conditions which specified for investigation phase of evaluation survey.
b. Inferred Coal Resource
Inferred Coal Resource is number of embers stones in investigation area or part from investigation area, what calculated based on data fulfilling conditions
specified for investigation phase of prospecting.
c. Indicated Coal Resource
Indicated Coal Resource is number of embers stones in investigation area or
part of investigation area, what calculated based on data fulfilling conditions specified for exploration phase of antecedent.
d. Measured Coal Resource
Measurable embers stone resource is number of embers stones in investigation area or
part of investigation area, what calculated based on data fulfilling conditions specified for exploration phase detail.
e. Probable Coal Reserve
Probable Coal Reserve is embers stone resource referred and some of sources
measurable embers stone energy, but based on feasibility study of all related factors has fufilled so that result of study expressed competent.
f. Proven Coal Reserves
Proven Coal Reserves is measurable embers stone resource which based on feasibility study of all related factors has fufilled so that result of study expressed competent.