Diamond core drilling was conducted on sandstone, limestone, and shale rock formations using a multispeed rotary boring machine with core barrel types NMLC or NX that have reamers on the bottom of the rod to produce continuous core samples. The core diameter was 54 mm and core recovery ratio (CRR) and rock quality designation (RQD) values were reported for each core run, with CRR and RQD defined as the ratio of core length obtained or good core length over 100 mm to total drilling length, respectively, and both having target values of 5%.

1. Diamond Core Drilling
• Drilling activities conducted on
sandstone, limestone, shale with Multispeed
Rotary Boring Machine.
• Core Barrel types NMLC or NX with reamer
installed on bottom of the rod for producing
of continuous core.
• Diameter of the core : 54 mm

2. • Core Recovery Ratio, CRR and Rock Quality
Designation, RQD will be reported for each
core run.
• CRR : core length ratio obtained from the total
length of drilling.
• RQD : ratio of total core length good (more
than 100mm) compared to the total length of
drilling.
• Value for both is 5%.