How do we calculate the volume of over- burden?
posted by Taufiyogi blogger
The results of measurements of the rock layers by drilling Drill Log Data will be obtained . So more and more drilling will be many drill log data created by a geologist who will be followed by a correlation of rock layers.
Ideal example :
Profile Drilling A , B , C , and D
t1, t2 is not the thickness of the coal seam but it is a sub overburden . Total Depth is the maximum depth drilled , measured from the ground level of the data based on the topography of the area .
t1 + t2 = sub overburden
Total OB = ( t1 + t2 ) x Area of Location
( T1 + t2 ) / tc ( coal) = sub Stripping Ratio
Total Stripping Ratio ( SR ) = Total OB : Total Coal seam (tc).
Therefore, to determine the average stripping ratio, should be a lot of drilling in the region with the distance ( interval ) is desired . if the distance is getting closer the more detailed data obtained anyway.
The example image correlation of rock layers
posted by Taufiyogi blogger
The picture above is just an illustration only, whereas the reality may be more variable .
The purpose of correlation of rock layers is to connect the layers of rock types according to the kind of data drill or drill logs , to get a thick rock layers in total , for the manufacture of stratigraphic modeling, reserve calculations and mine design.
Note : in calculating the volume of coal to be multiplied by 1.3 Coal Density ( kg / m3 ; tonnes / m3 ; kg / feet3 ; ton / feet3 ) it will get a weight unit metric tons.
The next stage is the exploitation and production.
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