Often in field survey activities we are asked or asked to make an estimate of The number of reserves, Striping Ratio, Pit Depth and Pit Width. How do I determine it using hypothetical calculations?
For example, from a field survey on a coal KP we get the following data: Found one layer of coal with a 40 degree coal seam slope and a thickness of 5 meters. Well we are asked to calculate the number of backups, SR, Depth and Width of the PIT. Want to know, this is the secret.
We have data: Thick coal, Dip coal, Overall Slope Highwall can be estimated, Cropline coal can be taken into account and morphology is considered flat.
The method can be solved simply by using trigonometric calculations. In this calculation we use the method of calculating hypothetical resources as – the following.
Description:
T = Thick coal,
Θ = Dip coal,
Ø = Overall slope,
H = Mine depth,
X1 = Mine opening 1,
X2 = Mine opening 2.
Now we're trying to calculate the coal layer that was found earlier.
A. Mine Width and Mine Depth
Can be calculated with the following formula:
Mine Width = X1 + X2
Mine depth = X1. Tan Θ
Where:
SR : Stripping Ratio (Nisbah Pengupasan)
BJ : Coal Type Weight/Density
t : Thick Coal
Φ : Overal Slope
Θ : Dip
h : Pit Depth
B. Striping Ratio
Striping Ratio is a comparative value between Overburden being dissed to obtain per ton of Coal.
SR = OB : Coal
Based on the image, obviously it feels like striping ratio can be easily calculated. Imagine that picture of a section of mine, then we can calculate the number of OB and Coal.
Number of Overburden = 1/2 x Aperture Width x Pit Depth.
Number of Coal = Coal thickness x RD x (H / Sin Θ)
Striping Ratio ; Amount of Overburden : Amount of Coal
Number of Coal Resources
To calculate the number of coal resources with a specific SR estimate, then we must consider this coal layer continuously with the same thickness. As for the formula used:
Coal Resources = Coal Thickness x RD x (H/Sin Θ) x Cropline Length
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