1. ii
ABSTRACT
The research is located in the work contract of open pit mine of PT
Newmont Nusa Tenggara which is administratively situated in Batu Hijau exactly
at the southwestern part of Sumbawa, Nusa Tenggara Barat province.
Geographically the research area lies in coordinate 116,400
- 116,550
east
longitude and 8,500
- 9,050
south latitude.
The research area divides into several rock units, namely a unit of
Volcanic, Diorite, and Tonalit rocks. The geological structure in the area of
research in general leads to southeastern Northwestern.
In studies of Geotechnics, PLI (Point Load Index) and Uniaxial
Compressive Strength (UCS) test are used to determine the value of the rock
strength. PLI tool and test procedure allows the test can be done more
economically than the test of UCS. The conversion factor ( K ) can be used to
estimate the value of UCS based on PLI value. The value of K has been proposed
by some researchers earlier for some types of rocks.
This research was conducted by performing the test with the UCS and PLI
on every unit of rocks of the area of research. There are 80 units test UCS and
PLI on a unit Volcanic, 44 on a unit Diorite, and 30 units of tests on a unit
Tonalit.
Keywords: Open Pit Mine, Batu Hijau, Point Load Index (PLI), Uniaxial
Compressive Strength (UCS), Conversion factor (K).