For your inform the draft final report for geotechnical report in MF10 .
However , Professor summarized if our overall bench height more than 30 m. thus overall slope should not more than 40 degree. (Our design overall slope was 24 degree).
So , Hubert could answer us how many degree could be design for kaolin in Ranong.
After that , JML will re-design the final pit for us (in term of 20 m. from the creeks both side)