Skripsi

ANALISIS BREAK EVEN GRADE (BEG) PENGOLAHAN MATERIAL SISA HASIL PENGOLAHAN (SHP) DI PT TIMAH TBK

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Penilaian

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PT Timah Tbk has concentrated its mineral processing activities in the Mineral Processing Division (BPM), located within the Muntok Metallurgical Unit, which has been operating since 1976. Residual processing material (SHP) from BPM is collected in a dedicated storage area in Gemuruh. Based on measurements, the SHP volume at the research site reached 6,772.5 m³ with a total weight of 8,804 tons, divided into three storage blocks. This condition presents both an environmental challenge and an economic opportunity through the reutilization of residual material in line with mineral conservation principles and Good Mining Practice. Laboratory analyses revealed that the Gemuruh SHP still contains significant levels of Sn. X-Ray Fluorescence (XRF) and Grain Counting Analysis (GCA) confirmed the presence of cassiterite with Sn content ranging from 0.1% to 0.3%. The estimated tin potential from Gemuruh SHP is considerable, with heavy mineral distribution still feasible for reprocessing. However, the existing processing using a 110-riffle Shaking Table only achieved a recovery of 47.6%, with an average capacity of 941 tons/month, indicating low processing efficiency. xii From an economic perspective, calculations showed that the actual Break Even Grade (BEG) was 2.76 kg Sn/m³, with a relatively high Cut Off Grade (COG). This condition renders most SHP material with grades below this threshold uneconomical to process. Owning cost, operating cost, and overhead were identified as the main factors contributing to the high BEG and COG. Therefore, optimization strategies are required to lower the minimum economically processable grade, enabling greater utilization of SHP material. This research conducted optimization simulations by adjusting Shaking Table operating variables such as deck inclination, water flow rate, and feeding rate, while reducing the processing stages from three sessions to two sessions, and adding one unit of 152-riffle Shaking Table. The optimization results demonstrated significant improvements: total recovery increased from 47.6% to over 54.55%, processing capacity rose from 941 tons/month to 1,176 tons/month, and the BEG decreased from 2.76 kg Sn/m³ to approximately 2.13 kg Sn/m³. Furthermore, the COG decreased from 0.23% to 0.16% due to improved equipment efficiency and shorter processing cycles.

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Availability

Inventory Code	Barcode	Call Number	Location	Status
2507006567	T186220	T1862202025	Central Library (Reference)	Available but not for loan - Not for Loan

Detail Information

Series Title

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Call Number

T1862202025

Publisher

Palembang : Prodi Magister Teknik Pertambangan, Fakultas Teknik Universitas Sriwijaya., 2025

Collation

xvi, 142 hlm.; ilus.; tab.; 29 cm.

Language

Indonesia

ISBN/ISSN

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Classification

622.07

Content Type

Text

Media Type

unmediated

Carrier Type

other (computer)

Edition

-

Subject(s)

Industri Pertambangan
Prodi Magister Teknik Pertambangan

Specific Detail Info

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Statement of Responsibility

MI

Other version/related

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