Geology Of The Sepon Copper And Gold Deposits Laos-Books Pdf

Geology of the Sepon Copper and Gold Deposits Laos
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The 2nd Lao Thai Technical Conference on Geology and Mineral Resources January 17 18 2013. characte, eristics with the, t Carlin ty, ype of minera. alization it may, m be class, sified as disstal dissemin. nated Au , Ag beca, ause of the association, a with. w a possib, ble zoned po, orphyry intrus, sive centeredd system . K, Key words Sepon , S sedim, ment hosted A, Au distal dis.
sseminated jasperoid , j exxploration, duction, 1 Introd Mt 1 3 percent Cuu for 330Kt Cu at. 25M, Th, he Sepon prroject comprises a 1247 km The. engkham So, outh 1 0 perrcent Cu cutt off and, contractt area and. d is owned, d by Chin, nese 29M, Mt 1 5 percent Cuu for 430Kt Cu at. domicile, ed MMG which operates, s locally as L.
Lane The, engkham North 1 0 perceent Cu cut offf . Xang Miinerals Limite, ed LXML Gold, G and cop, pper The Sepo. on project iss located 40 km north, depositss at Sepon contain. c over 4 4 Moz of g, gold of the town of, o Sepon i n the Sava. annakhet, and 2 0 Mt of contained copper Seven gold and pro.
ovince of south central Laaos at appro, oximately. opper deposiits exist with, three co hin a distancce of 105. 5 59 east longitude and 16 58 north, h latitude, 5 km an. nd comprise, e the Sepon mineral disstrict Fig, g 1 Laos is. s a landlockked country in central, SMD The Sepon gold min.
ne commen, nced Indochina sharing bordeers with Thailand . T, ons in late 2002, operatio 2 and pro, oduced 165 000 Mya. anmar Chin, na Vietnam and Cambo, odia The, oz of go. old in its first year Expan, nsion of the g, gold topography of the Sepon area is mo. oderately, plant an, nd constructtion of the adjacent.
a cop, pper und, dulating at an elevationn of around. d 250 m, plant we, ere completted in late 2004, 2 and e. early abo, ove sea level Veggetation co, omprises. 2005 resspectively Current, C gold resources sttand sec. condary fore, est punctuate, ted by rice paddies .
at 78 Mtt 1 7 g t Au, A for 4 4 Moz Au 0 5 g t Au slas. sh and burrn agriculturre and patches of, 165, cut off w. while copper resources comprise 44, 4 Mt prim, mary rain fo. orest The area has a typical, 2 9 p, percent Cu for. f 1 23 Mt Cu, C at Khano, ong monsoonal clim, mate with ann annual ra.
ainfall of, Fig 1 Loca, ation of the S, Sepon projec. ct area in sou, uthern Laos , 2200 mm and can be divided up into 3 three priority areas in southern and central Laos. seasons a dry cool period from October to were identified for assessment Of particular. February a hot humid period from March to interest were the Nam Kok and Nam Sengi. June and a rainy monsoon period from July to areas which had been the focus of Soviet. September alluvial mining between 1983 and 1985 Soviet. Access to the project from the provincial reports and mapping indicated the presence of. center of Savannakhet is via a 3 hour drive on a quartz stockworked sub volcanic intrusive. sealed highway followed by a 1 hour drive on an complexes and gold mineralization in silicified. all weather unsealed public access road The and sericitized contact zones Bakulin 1985 . company runs a 6 times weekly 90 minute CRA Exploration geologists first visited. charter flight to and from the capital Vientiane the Sepon area in December 1990 Gregory . The project is located on the southern portion of 1991 Reconnaissance traverses verified the. the historically infamous Ho Chi Minh Trail a presence of altered porphyry intrusives and. major North Vietnamese supply line into multi phase stockwork veining as described in. southern Vietnam during the Vietnam War As the Soviet reports This coupled with the. such the area was heavily bombarded by U S presence of pannable gold and outstanding rock. forces trying to stem the flow of North chip results 17 samples over 200 m averaging. Vietnamese troops and war machinery into the 18g t Au in strongly silicified sediments . southern Vietnam s theater Effective safety highlighted district scale potential for intrusive. systems developed for the clearance of residual related mineralization Manini et al 2001 A. 166, ordinance contamination remain an ongoing part rapid review of the available Landsat TM. of daily operations imagery confirmed regional prospectivity and an. application for a 5000 km area was submitted, 2 Exploration History. to the Lao government After a lengthy, 2 1 Discovery of Sepon.
negotiation exploration and development rights, Although the Sepon area had been. were granted to CRA under a Mineral, sporadically worked by both local artisans and. Exploration and Production Agreement MEPA , Soviet alluvial miners no assessment of the. in 1993 , hard rock potential of the area had ever been. undertaken prior to the involvement of CRA Rio Following the grant of title in 1993 . Tinto Exploration in 1990 Manini and Albert surface mapping and rock chip sampling. 2003 Following the end of the cold war and the generated immediate drill targets On the. subsequent opening of new exploration and Discovery prospect a 700 m long boulder train. development frontiers CRA Exploration made a of highly mineralized silicified and brecciated. strategic decision to expand its search into Laos sediments on the south side of the Nam Kok. Manini et al 2001 Very little was known at river was delineated and subsequently drill. the time about the geology and mineral potential tested Drill holes eventually intersected in situ. of the country so a reconnaissance visit was silicified and mineralized calcareous shale . made to assess the opportunities there providing impetus for scaled up activities in the. Following reviews of the geology politics skills district . base infrastructure and logistics of the country , Vientiane Capital Lao PDR.
The 2nd Lao Thai Technical Conference on Geology and Mineral Resources January 17 18 2013. Upon conclusion of the 1993 drilling discovered ore bodies with 44 000 m of drilling. program systematic geological mapping and completed Oxiana acquired an 80 percent. sampling were conducted focused on stake in the project in early 2000 with the Rio. delineating additional in situ mineralization and Tinto retaining a 20 percent holding Upon. enhancing the geological understanding of the finalization of the asset sale Oxiana. immediate area As a result similar silicified immediately commenced feasibility and. sediment was discovered along 1500 m of strike environmental social impact studies for a two. immediately to the east of the Discovery stage development of the Sepon gold and. prospect Simultaneously broader geological copper projects Manini and Albert 2003 . prospecting was carried out identifying Following a 12 month construction period the. additional areas of gold mineralization at Vang Sepon gold mine poured first gold in late 2002. Ngang and Namkok West and copper gold and has been operating successfully since . mineralization at Khanong on the flanks of the, 2 2 Ongoing Exploration. Padan porphyry intrusion Fig 2 Manini et al , Exploration re commenced in 2003 and. 2001 Mineralization in the Sepon area was, additional resources were delineated at both. identified as having affinities to the Carlin type. Luang and Vang Ngang Coupled with near , sediment hosted gold deposits of Nevada. mine resource extensions and before depletion, Sillitoe 1994 .
the gold resource base rose from 3 5 to 4 2 Moz, By the end of the 1994 drilling campaign in the first year of renewed exploration activity. potential for a 1 Moz resource at Discovery Manini and Albert 2003 . 167, was confirmed In addition systematic mapping. With detailed resource drilling grade , and sampling resulted in the recognition of six. control drilling and the commencement of, new sediment hosted gold targets and a second. mining in 2003 understanding of the geological, porphyry system with associated skarn and.
framework and controls on mineralization in the, carbonate replacement copper mineralization at. SMD was significantly upgraded Enhanced, Thengkham Fig 2 Manini et al 2001 . geological understanding of the economic gold, Regional exploration of the broader Sepon. deposits is being used to generate new, MEPA commenced in 1994 and programs. prospects in the SMD and a prospectivity matrix, comprising detailed regional stream sediment.
for prioritization of existing prospects has been. and rock geochemistry mapping airborne, developed Five key exploration criteria common. magnetic and radiometric surveys and remote, to all known ore bodies were identified 1 ENE. sensed Landsat and photo interpretation were, and or WNW structures 2 Rheological . completed over the entire 5000 km Stream, chemical contrasts 3 Presence of rhyodacite. sediment geochemistry clearly outlined a, porphyry dykes and sills 4 Presence of.
standout high order district scale multi , mapped jasperoid and 5 Strong multi element. element geochemical signature in the Sepon, Au As Sb geochemical signature in soils Smith . mineral district which has been the focus of, 2003 These key criteria were applied to the. gold and copper exploration since , entire district and 36 priority targets identified . Between 1994 and 1999 drill delineation, work by RioTinto continued on all of the newly.
Fig 2 SSummary ge eological maap of the Seepon minera al district main Fig annd inset showing the 168. location of the Au an, nd Cu deposits with respe, ect to the su. ub economic porphyry stoockwork systtems and, Padan a and Thengkh ham On main Fig A A L. Location of Discovery, D Colluvial cross section Fig 5 B B . Locationn of Nalou cross section Fig , 6 , Exxploration programs. p in late 2003 and wever blanke, how ets of transpported alluviu.
um up to, 2004 ha, ave been dessigned prima, arily to test th. hese 10 m in thicknes, ss appear too be masking, g bedrock. 36 iden, ntified targe, et areas Several, S of the ochemical signatures As a consequ. geo uence a, prospeccts have y, yielded high, h grade dri lling disttrict wide regolith geomoorphology map. m was, intercepts most nottably Nakach, han and Pha.
avat pro, oduced based on air photos and field, Fig 2 Many of the identified targets posssess trav. verses identtifying areas that may be, e covered. mical signatture , little or no surficial geochem by transported. d alluvium An extensive RAB, Vientiane Capital Lao PDR. The 2nd Lao Thai Technical Conference on Geology and Mineral Resources January 17 18 2013. Rotary Air Blade drilling program has been represent basin forming normal faults and. planned in an effort to more effectively sample northwest oriented structures represent original. bedrock transfer structures Coller 1999 Smith 2003 . While exploration at Sepon has always The timing of events in and around the. utilized a wide spectrum of techniques and Sepon basin is poorly constrained Limited. technologies programs have always maintained paleontological data suggest sedimentation took. a strong geological focus with an emphasis on place from Devonian to Early Permian Oxiana. basic prospecting geological mapping and Ltd unpublished data consistent with a Late. drilling Manini and Albert 2003 Devonian age for the onset of extension The. timing of igneous activity in the basin is similarly. 3 Geological Setting, poorly constrained The metamorphic grade is.
3 1 Regional Setting, sub greenschist and away from discrete. The SMD is located within the informally, structures or high strain zones no penetrative. defined Sepon basin The Sepon basin is, fabrics are developed . situated within the Truongson belt which forms, part of the Indochina terrane of Southeast Asia 3 2 Stratigraphy of the Sepon basin. Metcalfe 1996 The Indochina terrane formed The stratigraphy of the Sepon basin has. part of northern Gondwanaland during the been studied in detail only in the vicinity of the. Precambrian and may have rifted off in the Late mine area where detailed drilling has allowed a. Devonian Late Paleozoic and Mesozoic faunas robust stratigraphic interpretation Away from. indicate amalgamation with Southern China the mine area the general relationships appear. 169, during the Late Paleozoic Metcalfe 1996 to hold true but generally scarce outcrop and.
The Truongson belt extends in a NW lack of detailed drilling have prevented. orientation from central Vietnam to northern comprehensive development of a basin wide. Laos and consists of a metamorphic complex scheme . the Kontum block with successor basins The Sepon mine area stratigraphy. including the Sepon basin of poorly comprises eight major informal units Highway. constrained age possibly ranging from Silurian formations to Phabing with one unit Nalou. to Permian Lepvrier 1997 Overlying the formation comprising 3 informal members. Paleozoic basins is the Mesozoic Khorat basin Morris 1997 Fig 2 and 3 Sepon Highway. of Thailand and Laos formation is a thin 100 m unit consisting of. Geology of the Sepon Copper and Gold Deposits Laos BounOum Bouttathep MMG Limited Sepon District Savannakhet province Lao PDR e mail bbouttathep mmg com ABSTRACT The Sepon project area is located in south central Laos and has a long history of artisanal

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