Based on regularity /thickess (in mtrs)
a. Thin < 1.5m
b. Moderate between 1.5m to 4.5 m
c. Thick 4.5m to 9m
d. Very thick > 9m
Based on depth (in mtrs)
a. Shallow <200m
b. Moderate 200m to 450m
c. Deep >450
Based on inclination (in degrees)
a. Flat <5
b. Inclined 5 to 18
c. Steep 18 to 40
d. Very steep >40
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