dari ETTI, akan hadir 10 peserta: 1) Rizkyani 2) Intan Zalanda 3) Prasiddha 4) Deny Rahayu 5) Heidi Y. Samrosa 6) Daddy Hendarmin 7) Dwi Sriwahyuni 8) Trias Sidharta 9) Yudi Rismayana 10) Wenda Suhendar
salam, syaiful On Mon, Apr 13, 2009 at 3:50 PM, benyamin sembiring <benyaminsembir...@gmail.com> wrote: > * > Topic: Myanmar Jade* > > Speaker: Douglas J. Kirwin (VP Regional Affair – Society of Economic > Geologists) > > Moderator: Ir. H. Sujatmiko, Dipl. Ing (Indonesian Gemologist) > > Date: Tuesday – April 14, 2009; 12 a.m. – 2 p.m. > > Venue: Bima Room, 2nd Floor, Bumi Karsa Hotel, Bidakara, Jakarta > > Charges: IAGI/MGEI Members w/ Reservation Rp 250.000,- > > Non-Members w/ Reservation Rp 275.000,- > All Walk-ins (assuming availability) Rp 300.000,- > No Shows will be charged because we must guarantee head count to restaurant > Members of other professional associations are also welcome > > Contact Mobile Phone/Fax e-mail > Sutar +62 811162476 +62 21 83702848 iagi...@cbn.net.id > > > *ABSTRACT* > In cooperation with SEG (Society of Economic Geologists), MGEI-IAGI is > proudly arranging this luncheon talk, comparing gemstone between Myanmar and > Indonesia. > Jade has played an important cultural and economic role in Chinese society > for thousands of years. The commodity actually comprises two distinct > minerals: nephrite, which is microcrystalline mixtures of > tremolite-actinolite amphibole, and jadeitite, composed mostly of jadeitic > pyroxene. Since Neolithic times most of the production has been from > nephrite, while during the last few centuries “imperial jade”, or jadeite > has been almost exclusively sourced from northern Myanmar. Research by > Harlow et al.,(2007) demonstrates that jadeitite crystallizes from primary > fluids as vein type deposits which are generated during subduction of > oceanic crust and serpentinization of peridotites. There are 15 recorded > jadeitite global occurrences, and these primary deposits are typically small > shear-hosted lenses. The main production of jadeitite is from alluvial > deposits within ultramafic terrains, e.g. the Hpakan-Tawmaw district in > northern Mynamar. Geological mapping in British colonial times conducted by > Chhibber (1934) described tracts of jadeitite-bearing conglomerate terraces > with an areal extent of approximately 100 square kilometers and up to > 200metres in thickness.The source for the jadeitite boulders are eroded > upthrust serpentinised ultramafic blocks. > Jadeitite occurs as several color varieties, depending on trace element > impurities. The emerald green color which characterizes the highly sought > after “Imperial Jade”, is due to the presence of kosmochlor (a sodium chrome > silicate). The most common colors are pale to dark green caused by iron > derived from an augite component. This is marketed as “Utility Jade”. > Jadeitite boulders from Myanmar have a brown to black weathered surface > composed of ferrihydroxides, thought to be caused by chemical reactions with > the host conglomerate matrix. This makes exploration and quality evaluation > extremely difficult. Potential buyers for high quality material risk > fortunes on boulders with indications of imperial quality The main > evaluation criteria for uncut jadeitite are color, translucence, texture, > size and, to some extent, locality. Extensive numerous opencast jadeitite > mines currently are located in the Hpakan region in Kachin state, northern > Myanmar. The scale of mines involves removal and processing of hundreds of > millions of metric tonnes from a patchwork of government issued mining > leases. The operations are now highly mechanized, utilizing fleets of large > capacity excavators. Recovery of the jadeitite boulders however, is a labor > intensive hand sorting process. The selected jadeitite boulders are then > graded and sent to Yangon for marketing. There are three to four > government-run gem auctions held annually in Yangon where 90% of revenue is > from jade sales. The auctions attract hundreds of buyers, most of whom are > asian-based Chinese. The prices for quality jadeitite, like most other > mineral commodities, have risen dramatically of the past two years, largely > fuelled by the demand from east and central Asia, including the Indian > sub-continent. > * > About the presenter: Douglas J. Kirwin* > Doug has spent more than 35 years in the mineral exploration industry, much > of which has been in the Asia-Pacific region. He is currently the > exploration executive vice-president of Ivanhoe Mines, having directed that > company's exploration activities since joining in September 1995. He was > formerly managing director of International Geological Services Pty. Ltd. > and for several years held senior positions with Anglo American and Amax. He > has evaluated mineral deposits throughout the Americas, Asia and Europe, and > has managed numerous projects in Southeast Asia and Australia. > Doug holds a Master of Science Degree in mineral exploration from James Cook > University in Australia. As a member of the joint discovery team of the Hugo > Dummett Deposit at Oyu Tolgoi, Mongolia, Doug was a co-recipient of the PDAC > inaugural Thayer Lindsley medal awarded for the most significant > international mineral discovery in 2004 and was the Society of Economic > Geologists International Exchange Lecturer for 2006. He is currently the > industry advisor for the Society of Applied Geologists, China Mining, a > board member of Economic Geology Research Unit (EGRU) James Cook University > and the Vice President of the Society of Economic Geologists (SEG). > -- Mohammad Syaiful - Explorationist, Consultant Geologist Mobile: 62-812-9372808 Emails: msyai...@etti.co.id (business) mohammadsyai...@gmail.com Technical Manager of Exploration Think Tank Indonesia (ETTI) -------------------------------------------------------------------------------- PP-IAGI 2008-2011: ketua umum: LAMBOK HUTASOIT, lam...@gc.itb.ac.id sekjen: MOHAMMAD SYAIFUL, mohammadsyai...@gmail.com * 2 sekretariat (Jkt & Bdg), 5 departemen, banyak biro... -------------------------------------------------------------------------------- tunggulah 'call for paper' utk PIT IAGI ke-38!!! akan dilaksanakan di Semarang 13-14 Oktober 2009 ----------------------------------------------------------------------------- To unsubscribe, send email to: iagi-net-unsubscribe[at]iagi.or.id To subscribe, send email to: iagi-net-subscribe[at]iagi.or.id Visit IAGI Website: http://iagi.or.id Pembayaran iuran anggota ditujukan ke: Bank Mandiri Cab. 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