Orogenic Gold Workshop Orogenic Gold Workshop
Orogenic Gold Workshop Orogenic Gold Workshop
Orogenic Gold Workshop Orogenic Gold Workshop
ANGLOGOLDASHANTI COLOMBIA
MEETINGS 2010 EGYPT
ERITREA
UGANDA
PRESENTER
PROFESSOR DAVID I GROVES
CONTENTS OF WORKSHOP
R. Foster (2002)
FEATURES COMMON TO MAJORITY OF
OROGENIC GOLD DEPOSITS
200
Gold Resource (Moz) 100
50
30
10
Relative Crustal Growth
2.7
~ 50%
Onset of Modern-Style
1.9 Plate Tectonics ?
~ 25%
1.2
Ga
3 2 1 0.5 0
CRUSTAL SCALE OF OROGENIC
SYSTEMS
TIMING OF YILGARN GOLD
Youngest rocks hosting gold mineralisation
Granny Smith
Mt Shea U-Pb in zircon
Porphyry U-Pb in titanite
Jundee U-Pb in monazite
Kanowna Belle (pre-main Au event)
Mt Morgans Re-Os in molybdenite
Ar/Ar in mica
Ages of gold mineralisation Sm-Nd in garnet
Kanowna Belle (minor) Pb-Pb in pegmatite
Golden Mile Pb-Pb in sulphide
Eastern Mt Charlotte
Goldfields Victory, Kambalda
Province Chalice
Lawlers (minor)
Matilda, Wiluna
East Lode, Wiluna
Other Big Bell
Mt Gibson
Provinces Reedys
Marymia
Oldest rocks syn to post gold mineralisation Eastern Goldfields
Scotia Province
Scotia
Mt Gibson Other
Westonia
Griffins Find Provinces
Nevoria
Corinthia
2680Ma 2660 2640 2620 2600 2580 2560Ma
10 000mE 30 000mE
FIMISTON-STYLE
FIMISTON-
60 000mN LODES
ault
Mt
Percy
50 000mN
GOLDE
N MILE
KOS
40 000mN
GMFPo
SHEA 0 8
WEST km
SHEA
KCGM
YILGARN CRATON SHOWING PLUTONIC (15
(15)) IN RELATION TO EGP
Laterite
Alluvium
TROPICANA
GOLD DEPOSIT Eastern goldfields
superterrane
(4Moz Au)
Tropicana
AngloGold Ashanti
/Independence
greenfields gold
deposit
High-grade
intersections, e.g.
29m@5.1g/t Au
from 57m
Appears to be
located within
reworked Yilgarn
Craton margin
East Yilgarn
magnetic dataset