Geoscience Reference
In-Depth Information
Table 3.7
Rock quality designation.
RQD (%)
Rock description
Definition
0-25
Very poor
25-50
Poor
Sound core pieces
100 mm
Total core run length
>
RQD
=
∗
100
50-75
Fair
75-90
Good
>
90
Excellent
Figure 3.2
RQD measurement.
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