IDENTIFIKASI DAN KARAKTERISASI DEPOSIT BIJIH TIMAH MODEL SKARN DAN GREISEN DI PIT BLOK 3 PT. TIMAH BATUBESI, BELITUNG TIMUR

DOVENA, ADELA (2020) IDENTIFIKASI DAN KARAKTERISASI DEPOSIT BIJIH TIMAH MODEL SKARN DAN GREISEN DI PIT BLOK 3 PT. TIMAH BATUBESI, BELITUNG TIMUR. Diploma thesis, UPN "VETERAN" YOGYAKARTA.

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Abstract

i
ABSTRAK
Penelitian ini dilakukan pada endapan bijih timah primer segmen Skarn dan
Greisen. Keberadaan potensi bijih timah belum diketahui secara jelas.
Berdasarkan kadar rata-rata terendah untuk masuk proses pengolahan atau
Process Cut Off Grade (PCOG) perlu dibedakan menjadi ore dan waste, sehingga
dapat diketahui distribusi kadar timah Skarn dan Greisen. Tujuan dari penelitian
ini adalah (a) mengidentifikasi keberadaan potensi bijih timah, (b) menentukan
ore dan waste berdasarkan kadar batas penambangan timah dan (c) menganalisis
distribusi kadar potensi timah Skarn dan Greisen. Kadar rata-rata terendah yang
digunakan oleh UPTP Batubesi untuk Skarn ≥ 0,41% Sn dan Greisen ≥ 0,2% Sn.
Metode penelitian meliputi: pemetaan topografi dengan metode real-time
kinematic, pengambilan sampel pola bujur sangkar dengan metode grab sampling,
pengukuran kadar menggunakan XRF dan penaksiran potensi bijih timah dengan
metode poligon daerah pengaruh (area of influence).
Hasil-hasil penelitian meliputi: potensi bijih timah berupa singkapan Skarn
disepanjang lokasi penelitian dan menerus kearah TTg. Proses terbentuknya
endapan Skarn cenderung dikontrol oleh struktur geologi, pada lokasi penelitian
berupa sesar dengan arah jurus dominan BBL-TTg. Potensi positif berupa
cadangan ore Skarn pada dinding intrusi, terutama pada lode, yaitu urat yang
dikontrol oleh crack (bukaan), dengan kadar rata-rata 0,4567% Sn. Potensi negatif
berupa Greisen dan waste. Greisen pada tubuh intrusi granit memiliki kadar yang
lebih rendah, diindikasikan sebagai sumberdaya dengan kadar rata-rata 0,05% Sn,
waste diantara Greisen dan Skarn berupa batuan hornfels, dikontrol oleh sesar
berarah BBL- TTg dengan kadar rata-rata 0,0126% Sn. Nilai kadar timah tertinggi
terdapat pada deposit Skarn pada dinding intrusi, dengan frekuensi terbanyak
berada pada rentang kadar 0,1001 – 0,3% Sn sebanyak 123 data dari 318 data.
Greisen pada tubuh intrusi granit, dengan frekuensi terbanyak berada pada rentang
kadar 0,0001 – 0,025% Sn sebanyak 97 data. Berdasarkan hasil penelitian
diperlukan rencana pemantauan di pit sesuai kemajuan tambang dengan metode
pemetaan lapangan dan pengukuran kadar timah, data bawah permukaan untuk
membuat model bawah permukaan yang presisi secara vertikal dengan metode
test pit, trenching atau pemboran yang mengikuti struktur geologi berupa sesar
dengan arah BBL-TTg, pembaruan data blok model dengan infill drill dan
rekonsiliasi geologi dari front penambangan sampai dengan proses pengolahan.
Kata kunci : timah, bijih, Skarn, Greisen
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ABSTRACT
The study was conducted on primary tin ore deposits in the Skarn and
Greisen segments. The existence of potential tin ore is not distinct yet. Based on
minimum average grade for processing or Process Cut Off Grade (PCOG), it is
necessary to differentiate into ore and waste, so that can be known the distribution
of Skarn and Greisen tin grade. The purpose of this study are to (a) identify the
potential presence of tin ore, (b) determine ore and waste based on tin mining cut
off grade and (c) analyze the distribution of potential tin on Skarn and Greisen.
The cut off grade at UPTP Batubesi for Skarn ≥ 0,41% Sn and Greisen ≥ 0,2% Sn.
This study methods included: topography mappling using real-time kinematic
method, sampling with square pattern using grab sampling method, grades
measurement using XRF and estimating the potential tin ore using area of
influence polygon method.
The study results include: potential ore in the form of Skarn outcrops along
the research location and continuously towards East Southeast. The formation of
Skarn deposit are controlled by geological structure, at this research location
geological structure in the form of WNW – ESE faults. Positive potential are in
the form of Skarn ore reserves that lies in the intrusion wall, especially in lode, ie
veins controlled by crack, with an average grade 0,4567% Sn. Negative potential
are in the form of Greisen and waste. Greisen on granite intrusion body has lower
tin grade, indicated as resources with an average grade 0,05% Sn, waste that lies
between Skarn and Greisen in the form of hornfels, controlled by WNW – ESE
faults with an average grade 0,0126% Sn. Largest tin grade is in the Skarn deposit
on the intrusion wall, with highest frequency in grade range 0,1001 – 0,3% Sn
with the number 123 data of 318 data. Greisen on granite intrusion body, with
highest frequency in grade range 0,0001 – 0,025% Sn of 97 data. Based on the
results of the study, a pit monitoring plan is required in accordance to mine
scheduling with field mapping method and tin grades measurement, subsurface
data to create precise vertical subsurface model using test pit method, trenching or
drilling that follows geological structure in the form of WNW – ESE faults,
updating block model data with infill drill and geological reconciliation from
mining front to the processing plant.
Keywords : tin, ore, Skarn, Greisen

Item Type:	Thesis (Diploma)
Uncontrolled Keywords:	timah, bijih, Skarn, Greisen
Subjek:	T Technology > TD Environmental technology. Sanitary engineering
Divisions:	x. Faculty of Engineering, Science and Mathematics > School of Civil Engineering and the Environment
Depositing User:	Eny Suparny
Date Deposited:	07 Mar 2022 06:58
Last Modified:	07 Mar 2022 06:58
URI:	http://eprints.upnyk.ac.id/id/eprint/28640

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