Published on January 10, 2008
Aynak – a world-class sediment-hosted stratiform copper deposit in Afghanistan : Aynak – a world-class sediment-hosted stratiform copper deposit in Afghanistan Antony Benham, Stan Coats, Fiona McEvoy British Geological Survey Structure: Structure Introduction Afghanistan and the BGS project Mineral potential of Afghanistan The Aynak copper deposit Geology of the area Style of mineralisation Past mining/exploration activities Current and future activity Summary Introduction to Afghanistan: Introduction to Afghanistan Turbulent recent history Since the fall of the Taliban in 2001: Hamid Karzai elected President Peaceful elections in 2004 and 2005 Return to stability Mineral occurrences in Afghanistan: Mineral occurrences in Afghanistan The Kabul Block: Location of the Kabul Block The Kabul Block Thought to be a terrane accreted to margins of Laurasia 250 Ma Hosts numerous copper occurrences and old workings Tectonic map of Afghanistan: Tectonic map of Afghanistan Area shown in next slide Slide7: Geological map of Aynak Slide8: Cross sections through Aynak Slide9: Stratigraphic column at Aynak Mineralisation at Aynak: Mineralisation at Aynak Far right: Finely laminated biotite-feldspar-quartz schist with disseminations and stringers of chalcopyrite. Near right: Porphyroblastic dolomite marble with chalcopyrite. Left: Bornite mineralisation within dolomite marble of the Loy Khwar Formation. 1cm 1cm 1cm Slide11: Central Prospect, Aynak Slide12: Central Prospect, Aynak Slide13: Other occurrences in the Kabul Block Past exploration at Aynak: Past exploration at Aynak Extensive and detailed exploration by Soviet geologists between1974-76 and 1978-89 including: >150 boreholes 70 trenches 9 adits Surface geological and geophysical surveying Soviet “drill-indicated” resource estimate of 240 Mt @ 2.3 % Cu, however this does not conform to Western classification standards. Current work at Aynak: Current work at Aynak The BGS have created a database from exploration boreholes All reports relating to Aynak have been translated from Russian to English A 3D model of Aynak has been created in Vulcan Reports and borehole database available on request Slide16: The Aynak model created in Vulcan is primarily based on borehole data but also includes sections drawn by Soviet geologists Vulcan model of Aynak Left: Section through the western prospect at Aynak looking east through the steeply dipping anticline Slide17: Vulcan model of Aynak Left: Section through the central prospect at Aynak looking west through the shallow dipping section of the Aynak anticline The mineralised Loy Khwar Formation is the dark green unit 5 Slide18: Vulcan model of Aynak Slide19: Vulcan model of Aynak Possible Mineral Deposit Model: Possible Mineral Deposit Model Summary: Summary Main features of the Aynak deposit World-class stratabound ore deposit (240 Mt at 2.3 % Cu) Mineralisation hosted within dolomite marbles and calcareous-biotite schists Mineralogy dominated by bornite, chalcopyrite Consists of two prospects, the shallow dipping Central Prospect and the more steeply dipping Western Prospect Central Prospect amenable to open-pitting Other prospects close to Aynak include Darband and Jawkhar suggest Aynak is part of a larger “copper belt”
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Aynak MDSG 2006. Education. Tweet. 10. 01. 2008 0 views Period 6 CHapter 27. Education. Tweet. 11. 01 ... 2006 11 29 larcenter karlskoga. Education. Tweet ...
Aynak – a world-class sediment-hosted stratiform copper deposit in Afghanistan Antony Benham, Stan Coats, Fiona McEvoy British Geological Survey