Commodities
PrimaryGold, Silver
SecondaryCopper
Commodity typeM
Deposit
Deposit sizeL
Orebody formSTEEP VEINS, BRECCIA
Ore controlW Dipping, Nnw Striking Fault Zone, Fracturing In Host Rock (Intensity And Type).
Materials
Ore mineralsChalcopyrite, Galena, Gold, Malachite, Pyrite, Silver, Sphalerite
GangueBarite, Limonite, Quartz
Geology
Host rockMetasedimentary Rock,Greenstone,Schist,Volcanic Breccia (Agglomerate) · Sisa Association
Associated rockDiorite · Boiou (Intrusive) Microgranodiorite
StructureRidge System, Gentle Folding., Stockwork Veins And Breccia Matrix.
Tectonic settingN30w Striking Umuna Fault Zone, High Angle Fault Structure.
AlterationChlorite, Epidote, Clinozoisite, Sericite, Smectite, Deep Oxidation.
Economic & production
Development statusProducer
Production yearsPRIOR TO 1911 ALLUVIAL WORKINGS; UNDERGROUND WORKINGS THROUGH 1942; 1988 TO PRESENT, OPEN PIT.
First production1888
Identification
Deposit ID10055078
MRDS IDRE00014
Alternate namesUmuna, Gold Mines of Papua, And Kulumalia
RegionOC
Data scoreB
Coordinates-10.66169, 152.8054
References
PLACER DOME, INC., 1988, INTERNATIONAL ANALYSTS TOUR REPORT.GRAY, MATT (PLACER DOME), 1990, ABSTRACT FROM TECHNICAL PRESENTATION TO THE DENVER REGION EXPLORATION GEOLOGISTS SOCIETY 10 SEPT.,1990.PLACER DOME, 1990, ANNUAL REPORT.COX, D.P., WILLIAMSON, A. ET AL., MINERAL DEPOSIT MODELS APPLICABLE TO PAPUA NEW GUINEA: USGS UNPUBLISHED REPORT 86/5.CLARKE, D.S., LEWIS, R.W. & WALDRON, H.M., 1990, GEOLOGY AND TRACE-ELEMENT GEOCHEMISTRY OF THE UMUNA GOLD-SILVER DEPOSIT, MISIMA ISLAND, PAPUA NEW GUINEA, IN JOURNAL OF GEOCHEMICAL EXPLORATION VOL 35,NO.1-3, JAN 1990, P. 201-223.PLACER DOME, 1988. PLACER DOME, 1990.