uranium potential in greenland - iaea€¦ · thule region (sandstone and unconformity-related...
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Geological Survey of Denmark and GreenlandDanish Ministry of Climate, Energy and Building
Uranium potential in Greenland
Kristine Thrane, Per Kalvig & Nynke Keulen
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Greenland
• Greenland is part of the Kingdom of Denmark
• Largest island in the world, >2 mio. km2
• ~80% covered by an ice sheet
• 56.000 inhabitants• 18 towns and 60 settlements
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Uranium in Greenland
• Known uranium deposits (Keulen et al. 2014)
• Exploration and research in South and East Greenland in the 1950’s to the 1980’s
• Intrusion • Vein• Sandstone• Metasomatic• Volcanic• Qz-pebble conglomerate
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Stream sediment data
South Greenland has the highest background radiation in Greenland, but the Nuuk region also has relatively high background radiation
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Airborne radiometric survey
Armour-Brown et al. (1982)
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Uranium in Greenland
• The potential for uranium deposits is good (Keulen et al. 2014)
• Several areas with favorable geological environment for uranium deposits, fx. the Thule region (sandstone and unconformity-related deposit types).
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South Greenland
Radioactivity related to:
1) The Julianehåb batholith (pink)
2) Gardar intrusions (red-brown)
Licences –March 2013
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The Ilímaussaq ComplexAgpaitic Nepheline SyenitesHighly-evolved, highly-enrichedin incompatible elements (Zr, Nb, Ta, Be, REE, U, Th etc)
>220 minerals 34 discovered here 16 unique
- Kakortokites- Lujavrites- Naujaite- Sodalite Foyaite- Pulaskite, Foyaite- Augite Syenite - Quartz Syenite
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Upper Lujavrites (at Kvanefjeld)• Final crystallized melt• U concentrated in steenstrupine• Also enriched in REE, Th, Zn
and Be
Kakortokites (at Kringlerne)• Floor cumulates • Eudialyte rich layers – red
kakortokite• Eudialyte enriched in REE, Zr,
Ta, Nb and Hf • No U
From Rønsbo, 2008 modified after Andersen et al., 1981
Ilímaussaq Instrusion
?
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The Ilimaussaq Intrusion - Kringlerne
Foto: Henrik Friis
Kringlerne
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Upper Lujavrites (at Kvanefjeld)• Final crystallized melt• U concentrated in steenstrupine• Also enriched in REE, Th, Zn
and Be
Kakortokites (at Kringlerne)• Floor cumulates • Eudialyte rich layers – red
kakortokite• Eudialyte enriched in REE, Zr,
Ta, Nb and Hf • No U
From Rønsbo, 2008 modified after Andersen et al., 1981
Ilímaussaq Instrusion
?
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The Ilimaussaq Intrusion - Kvanefjeld
Foto: Henrik Friis
Kvanefjeld
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Na14REE6(Mn,Fe)3(Th,U,Zr)(Si6O18)2(PO4)7·3H2O
Steenstrupine
EudialyteNa15Ca6(Fe,Mn)3Zr3SiO(O,OH,H2O)3(Si3O9)2(Si9O27)2(OH,Cl)2
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The history of Kvanefjeld• 1955, Danish government initiates uranium prospecting program• GGU recommends targeting the Ilímaussaq Complex• A primitive geiger counter survey was carried out by military personnel. • 1956, the Kvanefjeld deposit was discovered.
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• 1957, first attempts were made to develop a method to extract uranium from ore • 1958, the first drilling program was carried out – 36 holes, 3728m• 1962, 1400 m were drilled
1957, Niels Bohr became an honourarycitizen in Narsaq
Start up
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• In 1977, 27 holes, 5100 m drilled• A one kilometre long adit in 1979-80• Approximately 4.500 tonnes of ore were transported to Denmark in 1980 for
further testing and processing.• Finally in 1982, an efficient extraction method was developed for uranium
from Steenstrupine.
Progress
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• Late 1970’s resistance against nuclear power rose in Greenland and Denmark.
• In 1985, Danish Parliament formally decided not to have nuclear power facilities in Denmark.
• A "zero tolerance" policy was introduced.• The ban was lifted October 24, 2013
Resistance
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Greenland Minerals and Energy (GME)
GME has invested over $75M in exploration and research over the past 6 years Source: GME
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Kvanefjeld Multi-Element Project
• The Kvanefjeld project: Kvanefjeld, Sørensen (Zone 2) Zone 3
• One of the largest REE deposits in the world
• Open pit mining highest grades near surface
Project overall resource inventory:956 Mt of ore containing: 10.33 Mt TREO (TREO includes: 0.37 Mt heavy REO, 0.84 Mt yttrium oxide), 2.25 Mt zinc, 575 Mlbs U3O8 indicated and inferred (JORC-compliant), at a 150ppm cut off
Source: GME
Kvanefjeld
Zone 3
Sørensen
License Boundary
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Total of 575 Mlbs U3O8 (260.800 ton U3O8)indicated and inferred, JORC-compliant, at a 150 ppm U3O8 cut-off
Source: GME
Olympic Dam’s resources are 5,404 Mlbs
Source: BCC, Company Filings and websites as at January 27, 2012
Milli
on lb
s
Kvanefjeld: 437 Mt ore at 274 ppm
3 Mt ore pa 820 ton U3O8 + 33,000 ton TREO
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21
Conclusions
• The uranium potential in Greenland is very good • Kvanefjeld is the first advanced uranium project in
Greenland• Application for exploration licence expected in 2015.