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1. Gosowong Geological Model
as at 13 July 2007*

2. Setting-
Sector
collapse

3. Epithermal telescoped upon porphyry

4. Kencana/Gosowong
Geological Model

5. Overprinting alteration
 Early
– Prograde Porphyry-related potasic grading to
inner propylitic
– Retrograde Sericite-
pyrophyllite+dickite+kaolinite
 Later
– ‘Prograde’ Illite-pyrite-chlorite
– Retrograde kaolin

6. Epithermal telescoped upon porphyry

7. Advanced argillic alteration

8. Model for staged porphyry
Cu-Au evolution

9. Magmatic
volatiles

10. Intense phyllic
alteration

11. Aeromag

12. Prograde Porphyry
alteration
Silica-chlorite-epidote
Kencana DDH DSD300
Chlorite-epidote-orthoclase
Gosowong North

13. Toguraci
Quartz vein with Kfeldspar selvage

14. Toguraci
Porphyry related
magnetite

15. Toguraci
retrograde
porphyry alteration
Silica-sericite-
pyrophyllite-
dickite-kaolinite wit
B veins

16. PIMA map

17. Gosowong illite

18. Low sulphidation alteration zonation

19. Kencana
Halloysite (hydrated kaolin) in the upper
portion of the system

20. Gosowong model

21. Gosowong Acid cap

22. Kencana/Gosowong
Geological Model

23. Gosowong Paragenetic sequence

24. Paragenetic sequence
 Porphyry – stockwork then sheeted
 Milky quartz
 Quartz-chlorite-pyrite
 Black silica -> chalcedony ginguro
 Continued quartz incl amethyst

25. Porphyry veins
Cu & Mo
- Tobobo
Stockwork form

26. Toguraci sheeted B veins

27. Toguraci sheeted
B veins

28. Toguraci porphyry clast in
epithermal veins

29. Milky quartz cuts porphyry veins

30. Milky quartz parallel to sheeted quartz

31. Sheeted porphyry veins
with parallel milky
quartz

32. Toguraci pit

33. Sector collapse and telescoping

34. Different fluids
and vein types

35. Fluids and
vein elements

36. Magmatic arc Cu-Au-Ag mineralisation

37. Styles of mineralisation
 Porphyry – stockwork then sheeted
 Quartz sulphide Au + Cu
 Quartz-chlorite-pyrite
– vein &
– Quartz fill breccia
 Black silica …. Multiple events
 Pyrite-clay
 Chalcedony-ginguro (adularia)
 Ginguro

38. Low sulphidation quartz sulphide Au
marginal to porphyry

39. GND34 121m
GND38 253.8m
Low sulpidation
quartz-sulphide Au + Cu
TOD12 101m

40. Silica-chlorite-pyrite cuts
banded milky quartz

41. Quartz-chlorite-pyrite
TOD12, 92.5m; 193Au, 897Ag, 42Cu, 1520Zn, 1580Zn, 14Mo

42. Free gold in quartz-chlorite-pyrite

43. Silica- chlorite-pyrite
with comb quartz

44. Fluid
inclusions

45. Possible
Tellurides

46. Quartz chlorite
cut by quartz
DDH234, 206.4m
20Au, 7.6Ag, 11Cu, 32Pb, 44Zn,
5Mo

47. Black silica
DSD300 248.1m; 358Au, 125Ag, 745Cu, 88Pb, 65Pb,137Mo

48. Black silica breccias

49. Black silica – fine pyrite

50. Banded black silica-quartz

51. Gold with banded black silica & haematite

52. Black-silica
DDH DSD 217, 309.2m;
2.99Au, 3.5Ag, 63Cu,
8Pb, 28Zn, 5940Mo
Blue secondary
Mo minerals

53. Black silica –
note post-dated quartz & secondary Mo stain
DDH DSD217 285.8m;
30.2Au, 49.3Ag, 52Cu, 97Pb, 66Zn, 713,Mo

54. Black silica fluidised
breccia clasts in kaolin
DSD44, 185.6m
DSD300, 254.25m, 63.1Au, 18.2Ag,
166Cu, 21Pb, 45Zn, 7Mo
11.8Au, 10.8Ag, 78Cu, 15Pb, 42Zn

55. Pyrite-clay
DDH DSD277, 281.2m; 1565Au, 535Ag, 3160Cu, 417Pb, 214Zn, 30 Mo

56. Banded chalcedony

57. Chalcedony-ginguro
DSD300 258.3; 51.5Au, 15.7Ag, 107Cu, 17Pb, 106Zn, 6Mo

58. Banded chalcedony
with haematite
DSD277, 298.7m
28.2Au, 9.5Ag, 96Cu,
15Pb, 382Zn, 20Mo
DSD277, 287m
11.1Au, 4.1Ag, 40Cu,
8Pb, 250Zn, 2Mo

59. Style example Au Ag Cu Pb Zn Mo
Porphyry 0.1-1 low high mod mod hig
h
Quartz-sulphide 1-2 low mod mod mod
Black silica DSD300
248.1m
358 125 745 88 65 137
Chalcedony-
ginguro
DSD300
258.3
51.5 15.7 107 17 106 6
Silica-chlorite-
pyrite
TOD12
92.5m
193 897 42 1520 1580 14
Pyrite-clay DSD277 >1000
*
500 900 400 300 100
Chlorite in quartz
breccia
DSD 234
206.5m
20 7.6 11 32 44 5
Ginguro BOD29 10-660Au, 100-380Ag, low Cu

60. Mechanism of Au deposition
 Porphyry – Cooling and mixing with hot
low pH waters which form pyrophyllite
 Boiling in banded adularia rocks
 Bonanza Au
– Mixing with low pH waters
– Mixing with oxygenated waters

61. Different fluids
and vein types

62. Gosowong acid cap

63. Gosowong Kaolin and illite

64. Halloysite (hydrated kaolin) in the
upper portion of the system

65. Kencana/Gosowong
Geological Model

66. Mixing with low pH waters
evidenced by kaolin
DDH DSD277, 281.2m; 1565Au, 535Ag, 3160Cu, 417Pb, 214Zn, 30 Mo

67. Intersection of K1
and link structure
DDH DSD277, 294.7m,
1326Au, 400Ag, 3350Cu,
365Pb, 175Zn, 584Mo

68. Kencana/Gosowong
Geological Model

69. Banded chalcedony
with haematite
DSD277, 298.7m
28.2Au, 9.5Ag, 96Cu,
15Pb, 382Zn, 20Mo
DSD277, 287m
11.1Au, 4.1Ag, 40Cu,
8Pb, 250Zn, 2Mo

70. Kencana gold with haematite

71. Kencana/Gosowong
Geological Model

72. Late quartz

73. Late amethyst

74. Structural controls

75. Kinematics

76. Changes in convergence as a trigger

77. Structure and
mineralisation

78. Gosowong structure

79. Kencana structure

80. Vertical
slickensides

81. Structure and
mineralisation

82. Toguraci

83. Tobobo

84. Structural model

85. Kencana structure

86. Kencana/Gosowong
Geological Model

87. K1 ore shoots

88. Ore shoot orientation

89. Controls to ore shoots
 Mechanism of Au deposition
 Structure
– Dip of vein
– Strike of vein
– Access of low pH waters
– Structural intersections

90. K1 drill intercepts in gram x metres

91. K1 assays

92. K2 vein dips and link structures

93. K1 compilation

94. K1 controls to ore shoots

95. K1 ore shoots

96. K2 drill intercepts in gram x metres

97. K2 assays

98. K2 vein dips

99. K2 grade and vein dips

100. K2 controls to ore shoots

101. Epithermal telescoped upon porphyry

102. Kencana/Gosowong
Geological Model

103. Kencana/Gosowong
Geological Model

104. Kencana/Gosowong
Geological Model