society of economic geologists (seg) - adimb society of economic geologists (seg) advancing science...
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Society of Economic Geologists (SEG)
Advancing Science & Discovery
• Representing 5400 members in 100 countries
• Members from industry (~2/3) and research (~1/3)
• Advance the science of economic geology
• High-quality conferences, seminars, publications (Economic Geologists)
• Assists in development of all economic geologists
• Short courses, workshops, field trips
• Provides a network of colleagues; promotes excellence
• Student support
• An introduction to the profession
• Network and mentors
• Many educational and funding opportunities
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SEGF investment in students worldwide
0
50
100
150
200
250
300
350
400
450
2000 2005 2006 2007 2008 2009
Levels: 2000, 2005-2009
SEGF ($k)
Keystone 2006 Wealth
Creation conference
SEG membership
members students
‘00 3501 314 (27 ch)
‘10 5260 937 (44 ch)
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Jeffrey Hedenquist, Ottawa (President, SEG)
Antonio Arribas (Newmont), Chico Azevedo (Gold Fields),
Rich Goldfarb (USGS), and Richard Sillitoe (UK)
Gold Discoveries in the Americas: Challenges and Opportunities
Alto Chicama, Peru
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Outline
• Gold deposits of American Cordillera
• Styles, distribution, importance, tectonics
• Orogenic and intrusion-centered dominate
• Au deposit discoveries, 1970-2008 (21st C)
• Southern Peru trend
• Discoveries, and deposits, grow
• South America update
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Sillitoe, 2008
>10 Moz belts: Heterogeneous distribution, styles, ages, location!
3/4 of 1000
Moz Au
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Goldfarb, 2010
Several Mexican Ag-Au
(≥5 Moz)
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Tectonic Settings of Orogenic Gold
• Gold in the fore-arc, arc and back-arc:
20-200 m.y. younger than host rocks, deep metamorphism
• Gold correlates with changing stress/transpressive reactivation
• Highest uplift rates adjacent to transpressive 1st order faults
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Cordilleran Mesozoic
Gold Belts:Ores in Accreted Arcs,
Marine Sequences, and
Overlap Assemblages
KEY REGIONAL
EXPLORATION
TARGETS
1) Major structure
2) Metamorphic grade
3) Physical or chemical trap
Hg: tops of young orogenic ores
Hg
districts
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Paleozoic Orogenic Gold
7 Moz prod.
100 Moz100 Moz
250 Moz
150 Moz
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Numerous deposit
styles juxtaposed
in space
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after R. Goldfarb, from Groves et al., 2005
Intrusion-centered deposits: tectonic setting
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Pascua
Gaby
Globe
Porphyry systems of the Americas Sillitoe, 2010
Cu-MoCu-Mo-AuCu-AuAg-Pb-Zn-Cu
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Sillitoe, 2008 Intrusion-centered discoveries:
New regions, new ideas
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S Peru
7,55,41,0
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Late Miocene high-sulfidation epithermal gold deposits
of the Aruntani district, southern Peru
Dante Loayza and Jorge Barreda (Aruntani SAC),
Alvaro Crósta, Wolfgang Morche, and Jeffrey Hedenquist
Recent discovery of a new ore type
in an abandoned mining district
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Discovery of Santa Rosa (1997/2002, 0.4 Moz
Au) led to Tucari (2000/2004, 2+ Moz)
Reawakened interest in region...
Tucari, 2002: 5000 m
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Chucapaca
Aruntani
Lago
Titicaca
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Canahuire resource model & pit shell: Chucapaca JV
1.3 km
350 m
700W
300W
100E
W E
Looking Northg/t Au
• Resource, May 2010: 5.8 Moz Au eq.
• Discovery, September 2008
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(year-on-year, after production)
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-50°
-40°
-30°
10°
-20°
-10°
0°
80°100° 50°60° 40°
Gurupi
Increible 6Aurora
La Zanja
Angostura
Shahuindo
Las Cristinas/Brisas
Caetes
Ernesto
Invicta
Casposo
Guanaco
Minas Conga
Cerro Casale
PucamarcaAmayapampa
Pascua Lama
C1 Santa Luz
Esquel
Cerro Negro
South America – Active Au projects
Aurizona
Feasibility and Pre-Production
Total resources >500,000 oz Au(Source MEG)
Calcatreu
Minas Conga: 700k oz/y, $2.9 B
Pascua Lama: 775 k oz/y, $2.95 B
Cerro Casale: 1,050 oz/y, $4.2 B
Inactive projects:
Las Cristinas/Brisas, Esquel
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-50°
-40°
-30°
10°
-20°
-10°
0°
80°100° 50°60° 40°
Alemao
La Colosa
Condor - FdN
Marmato
Lobo-Marte
Caspiche
Volcan Lama
South America – Au projects: target outline and resource
development phase
26 Gold projects with total resources
> 2 M oz Au (Source MEG)
Most recent discoveries:
La Colosa: 12.2 M oz @ 1.0 g/t Au
Condor (FdN ): 11.8 M oz Au @ 9.1 g/t Au
Caspiche: 24.2 M oz Au @ 0.5 g/t Au+0.2% Cu
Other world class deposits:
Marmato: 9.7 Moz Au @ 0.96 g/t Au
Alemao: 4.4 Moz Au@ 0.86 g/t Au+ 1.3% Cu
Lobo-Marte: 6.5 Moz Au @ 1.1 g/t Au
Volcan: 11 Moz Au @ 0.9 g/t Au
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Summary
• Gold deposits of American Cordillera
• Strong endowment of many styles
• Heterogeneous belts
• Potential to define new belts
• Challenges: geological
• New regions, more cover
• Opportunities
• Deposits being found, lateral thinking
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Alto Chicama, PeruBLEG; 10.5 Moz resource, 2003
Lagunas Norte, 1.24 g/t Au, >206 Mt oxChimu quartzites
Calipuy volcanics
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QuickTime™ and a decompressor
are needed to see this picture.
Sillitoe, 2008
Mutual exclusivity
of the MAJOR
regions of gold and
copper deposits of
the Cordillera
• >10 Moz Au in
22 belts, 5 giant
deposits
• <5% of
Cordillera, 3/4 of
1000 Moz Au
• 3 compressive
belts, >40% of
world’s Cu
QuickTime™ and a decompressor
are needed to see this picture.
Source(s) of heterogeneity?
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0.1
1
10
100
1950 1960 1970 1980 1990 2000 2010
Grade (g/t Au)
Average grade of discoveries in the World
(3-Year rolling average for discoveries >1 Moz)
Average grade of gold
mined in the World
Average grade of gold mined in
USA + Canada + Australia + South Africa
McKeith et al., 2010, SEG Newsletter