THE COMPARISON OF FLATTENING TREATMENT AND DYNAMIC ANISOTROPY ON NICKEL RESOURCES ESTIMATION AT PT ANTAM, EAST HALMAHERA REGENCY USING ORDINARY KRIGING METHOD
Nickel is one of Indonesia's natural resources that spread in Eastern Indonesia such as Southeast Sulawesi, South Sulawesi, and Halmahera. Nickel deposits are divided into 2 types, namely primary nickel and secondary nickel. Nickel deposits in Indonesia include secondary nickel (nickel later...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/69424 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Nickel is one of Indonesia's natural resources that spread in Eastern Indonesia such
as Southeast Sulawesi, South Sulawesi, and Halmahera. Nickel deposits are divided
into 2 types, namely primary nickel and secondary nickel. Nickel deposits in
Indonesia include secondary nickel (nickel laterite). Laterite nickel formation
process begins when ultramafic rocks are exposed on the surface, then due to the
influence of tropical climate, geological structure, topography, chemical reagenis,
vegetation, and lime, the rock undergoes a weathering process, due to weathering
the elements have low mobility to immobile such as Ni, Fe and Cr undergo residual
and secondary enrichmeni, this is called lateritization process. In Indonesia, nickel
mining has been carried out a lot, therefore it is necessary to explore in other
potential areas so that the amount of nickel resources is increased. In this study,
the process of estimating nickel resources in the saprolite zone with 5 major
elements, named Ni, Co, Fe, SiO2, and MgO, was carried out using the ordinary
kriging method with flattening treatment and dynamic anisotropy. This process
begins with domaining PT ANTAM' exploration data to determine the saprolite
zone drilled by using statistical methods Ihen creating a database in the form of
collar, survey, and assay data for modelling the saprolite layer with Datamine
Studio RM software . Then the saprolite model is to be processed into block model
in23mx 12. 3mx Im size. The next process is variogram modeling. The results of
ihe variogram modeling are then used as parameters to estimate the resource of the
ordinary kriging method with flattening and dynamic anisotropy treatments. The
estimation results show the amount of nickel resource is 25499700 wmt with an
average grade of 244 for the flattening treatment and 25337400 wmt with an
average grade of 2.446 for the dynamic anisotropy treatment. Based on the results
of comparison, both Ireatments have high accuracy in estimating resource wilh
nickel content estimated » 1.846, pyrometallurgical processing (RKEF) can be
carried oul so that the estimated nickel resource in the study area can be started to
have reasonable prospects for hereinafter referred as resources. |
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