PIT DESIGN AND MINING SEQUENCE OF NICKEL ORE ON PIT B BLOK MANGROVE PT. INDRABAKTI MUSTIKA SITE LAMERURU
Keywords:
Nickel, Mine Resource, Mine Reserve, NetpromineAbstract
PT. Indrabakti Mustika is one of the companies that took the opportunity to carry
out a nickel ore mining business with a Mining Business Permit (IUP) area of
576.00 Ha. Currently PT. Indrabakti Mustika plans to open a mining area in the
Mangrove Block Pit B, which is in the Mangrove Block Pit B with an estimated area
of ± 20 Ha. This study aims to design a pit based on ore deposits, calculate the
amount of reserves based on the pit limit design and design a mining sequence
based on production targets in Pit B of the Mangrove Block. The amount of reserves
obtained is based on the pit limit design with a cut off grade by the company of
1.25% Ni, the total reserves are 1,421,931.25 tons with a mining recovery of 90%,
the total mineable reserves are 1,279,738.13 tons. The average Ni content is 1.55%
and the resulting stripping ratio is 2.08:1, so that the mine life of the Mangrove
Block Pit B is estimated at 7 months. Based on the production target, the sequence
is designed with 7 stages of mining (mining sequence) where the average grade
value of the first sequence and the seventh sequence is 1.6%.
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