Comparative Analysis of Mined Reserve Tonnage on "M" Hill Between Mine Plan and Mining Realization

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INTRODUCTION
To achieve optimal production, mining planning is carried out (Dzakir et al., 2022;Jafar, 2016;Yogi Pranata et al., 2017). To maintain the continuity of production, mining planning is carried out in the mining stages. Mining phasing provides information about locations to be mined in the future according to production targets (Febrylian, 2013;(Thamsi, 2017;Thamsi et al., 2021).
In mining activities, there is often a discrepancy between the plan and actual conditions in the field, this discrepancy was found after a work meeting was held regarding comparative analysis between the mine plan and the realization of mining. Non-conformities that often occur include overcut (excess excavation), undercut (lack of excavation), and over stripping (stripping beyond the specified target position). If not identified early, this discrepancy can occur repeatedly and continue every month, and will potentially cause losses to the company (Ibrahim, 2014;Anwar et al., 2020Anwar et al., , 2021. The frequent occurrence of data discrepancies between mineral deposits and the realization when mining is carried out makes it important to conduct research on the factors that cause these differences. Therefore, researchers are interested in conducting research with the aim of knowing the factors that cause the difference between mine plans and mining realization (Afriandi, 2015;Dewanti, 2015;Mustika, 2016;Widodo, 2015).

METHODS
The method of data processing is done with the help of software on a computer (computing). Using Surpac 6.3 mining software assistance to calculate reserve tonnage using backup model block data using model block tools then report using topographical artist mining survey data which limits the model block at the top and pit design or pit limit limits the model block at the bottom, it can be the volume is known from the topography of the mine progress and the pit design or pit limit then the volume is

RESULTS AND DISCUSSION M hill
Bukit M is a mining front that started producing ore in August 2015 to November 2015 in the first period then continued in April 2016 until now. The mining method used at Bukit M is the open-pit mining method, ie all mining activities are carried out above the earth's surface and are in direct contact with the outside air by means of an open pit, namely open-pit mining by digging ore deposits down to form a basin or pit. The limit of active mining openings on Bukit M is 4.77 Ha. can be seen in the following image:

M Hill Reserve
Reserves are calculated using the detailed exploration block model (EMD) and the input drill block model (EMPS) using the same mine progress survey parameters on 02 September 2015 and the Bukit M pit design with the name pml9n-pid6-clip.dtm. Reserved research area locations can be seen in the

Mined Reserve Production
Mined reserve production is the amount of laterite nickel ore that has been excavated or mined expressed in tons, to determine the tonnage of mined ore production based on planning, it can be determined using Surpac 6.3 software using block model data, pit design (pit limit), and mining progress. Meanwhile, to determine the actual tonnage of mined ore production using a weighbridge, by weighing the dump truck when it is loaded and when it is empty when it goes to the stockyard and when it returns from the stockyard.

Movement Material Difference
Material movement difference is the amount of material movement difference in the form of waste and ore between mine plans (based on detailed exploration drilling and based on Inpit drill with mining realisation.
Based on Tables 3, 4, and 5, material movement from detailed exploration, material movement based on Inpit drill, and actual material movement of mining at Bukit M from September 2015 to November 2015 and April 2016 to June 2016 are stated in table 6 as follows:  961,80 89.853,68 77.106,38 39.802,97 49.282,19 33.072,23 In table 6, it is known that the planning closest to actual mining is planning based on input drill, which can be seen in the following graph: From the graph above, the input drill has the slightest difference, where the monthly average difference is 10%. In comparison, detailed exploration with an average monthly difference of 42% shows that the input drill has the closest material movement difference actual.

Mined Ore Production Difference
The difference in Ore mined is the amount of difference in Ore mined between the mine plan (based on drilling carried out by Exploration Mine Development and based on drilling carried out by the Exploration, Mine Plan, & Survey work unit) and mining realisation.
Based on Tables 3, 4, and 5, it can be seen the number of ore mined from detailed exploration, the number of ore mined based on the Input drill, and the actual number of ore mined at Bukit M from September 2015 to November 2015 and April 2016 to June 2016 respectively. As stated in table 4.7 as follows: In table 4.7, it is known that the planning closest to actual nickel ore (ore) mining is planning based on the input drill carried out by the Exploration, Mine Plan, & Survey (EMPS) work unit, which can be seen in the following graph: