The document discusses gold placer mining and describes how gold is naturally concentrated in placer deposits through sedimentation processes involving water movement. It explains that gold placer deposits are formed through ordinary sedimentary processes where heavy minerals like gold become concentrated or deposited by natural means. Different types of gold placer deposits are described such as alluvial deposits, gravel bars, and floodplain deposits.

1. GOLD PLACER MINING
Presentation by Moedji
Prepared for PT BBM

2. E M AS T E R B E N T U K
D AR I
P R O S E S M AG M AT I S M E
ATAU
P E N G K O N S E N T R AS I AN
D I P E R M U K AAN .
B E B E R APA E N D APAN
T E R B E N T U K K AR E N A
P R O S E S M E TAS O M AT I S
M E K O N TAK D AN
L AR U TAN H I D R O T E R M A
L , S E D AN G K AN
P E N G K O N S E N T R AS I AN
S E C AR A M E K AN I S
M E N G H AS I L K AN
E N D APAN L E TAK AN
( P L AC E R ) . G E N E S A
E M AS D I K AT E G O R I K AN
M E N J AD I D U A YAI T U :
E N D APAN P R I M E R ;
D AN
E N D APAN P L AS E R .

3. E M A S A L U V I A L
D I S E B U T J U G A
D E N G A N " E M A S
P L A C E R " . E N D A P A N
P L A C E R A D A L A H
E N D A P A N Y A N G
T E R B E N T U K O L E H
P R O S E S S E D I M E N T E R
B I A S A Y A N G
T E R E N D A P K A N A T A U
T E R K O N S E N T R A S I
M I N E R A L - M I N E R A L
B E R A T . U M U M N Y A
P R O S E S P E M I S A H A N
G A Y A B E R A T A L A M I A H
I N I D I B A N T U O L E H
M E D I A A I R B E R G E R A K ,
M I N E R A L - M I N E R A L
B E R A T T E R S E B U T
H A R U S T E R L E B I H
D A H U L U T E R B E B A S K AN
D A R I B A T U A N
A S A L N Y A , H A R U S
M E M I L I K I B E R A T J E N I S
Y A N G T I N G G I ,
R E S I S T E N S E C A R A
K I M I A T E R H A D A P
P E L A P U K A N , S E R T A
M E M I L I K I D U R A B I L I T A S
T I N G G I .

4. T Y P E C E B A K A N E M A S
A L U V I A L / P L A C E R :
1 . E N D A P A N K I P A S
A L L U V I A L
2 . G R A V E L B A R
3 . C H A N E L D E P O S I T
4 . F L O O D P L A I N
D E P O S I T
5 . C O A S T D E P O S I T

5. KONSENTRAT
EMAS :
E M A S B I A S A
T E R K O N S E N T R A S I
P A D A A L I R A N S U N G A I
Y A N G M E L A M B A T D A N
D I B E L A K A N G B O U L D E R
S E R T A B E R A D A P A D A
E N D A P A N P A L I N G
B A W A H K A R E N A E M A S
M E M I L I K I B E R A T J E N I S
Y A N G T I N G G I

6. MENAMBANG
EMAS
PLACER

7. KEGIATAN
SAAT INI DI
DISEKITAR
MANOKWARI
Alat berat untuk penambangan emas ilegal
berada di tepi Sungai Muara Wasirawi,
Kabupaten Manokwari

8. RENCANA KERJA