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This study is motivated by the discrepancy between production targets and actual field performance caused by dynamic operational conditions, such as equipment productivity and effective working time. The objective of this research is to redesign the production target and develop a more realistic mine sequence using a rolling plan approach at Pit Hill16. The method includes analyzing the productivity of loading and hauling equipment based on cycle time data, calculating effective working time, and determining production targets using the rolling plan method. Furthermore, mine sequence design is developed based on the adjusted production targets. The results indicate that the productivity of loading equipment is 241.98 BCM/hour for the EC480DL excavator and 123.27 BCM/hour for the EC210DL excavator, while hauling equipment productivity is 40.24 BCM/hour. The April production target based on the rolling plan is 275,913 BCM, which can be achieved through mine sequence design with a volume of 277,839 BCM, resulting in a difference of +1,926 BCM, still within acceptable planning tolerance. Therefore, the rolling plan approach is proven to produce a more adaptive and realistic mining plan under actual field conditions.

Nikel merupakan logam transisi yang berwarna putih keperak-perakan dan memiliki sifat yang keras, ulet dan sedikit ferromagnetis. Pada penelitian ini dilakukan pelindian nikel laterit dengan H2SO4 untuk menganalisis kandungan unsur Ni, preparasi dilakukan dengan drying, grinding dan kemudian sizing. Hasil preparasi dilakukan uji ED-XRF untuk mengetahui unsur yang terdapat dalam bijih tersebut. Pelindian kemudian dilakukan dalam tabung reaktor dengan bijih nikel ukuran kurang dari 150 mesh sebanyak 60gram dan 300 ml larutan H2SO4 1,4 M, proses pelindian dilakukan selama 3 jam dengan kecepatan pengadukan 320 rpm dan pada suhu 80oC. Larutan kaya hasil pelindian dilakukan uji AAS untuk mengetahui kadar unsur Ni. Pada uji ED-XRF didapatkan Ni sebesar 8,892 % dan NiO sebesar 4,961 % sedangkan pada uji AAS diketahui kadar nikel dari hasil pelindian nikel laterit yaitu sebesar 3458,25 mg/L.