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Emperor, Vatukoula

Fiji

Main commodities: Au Ag
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Deposit Description

The Emperor gold deposit at Vatukoua is 8 km south of the north coast on the island of Viti Levu in Fiji.   Fiji lies on the circum-Pacific Tertiary volcanic Belt.

The deposit consists of a system of quartz vein filled fractures lying within 2 km of the margin of the Tavua caldera in the Miocene Mba Volcanics, but mosty within pre-caldera basalts. The host rocks in the mine area are mainly near horizontal olivine flow basalts, trachybasalt pyroclastics and steep trachyandesite dykes.

Most of the gold won from the mine has come from 3 types of veins, namely:  (1) steep north-west shears,  (2) flat makes, and  (3) shatter structures

Veins are dominantly composed of quartz with minor pyrite, tellurides, gold, sphalerite, arsenopyrite, chalcopyrite, tetrahedrite, galena, dolomite, calcite and mica and are both pre and post faulting, contain vugs and show evidence of repeated opening. The vein selvages are composed of an inner K feldspar and an outer chlorite-carbonate rim.

Between 1934 and 1987 the mine produced 112 tonnes of gold and 40 tonnes of silver. The overall average grade of the lodes mined from underground had been 7.5 g/t Au.

For more detail see the reference(s) listed below.

The most recent source geological information used to prepare this summary was dated: 1985.    
This description is a summary from published sources, the chief of which are listed below.
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  References & Additional Information
 References to this deposit in the PGC Literature Service Collection: Want any of these papers ? Click Here
Ahmad M, Solomon M, Walshe J L  1987 - Mineralogical and geochemical studies of the Emperor Gold Telluride deposit, Fiji: in    Econ. Geol.   v82 pp 345-370
Eaton P C, Setterfield T N  1993 - The relationship between epithermal and porphyry hydrothermal systems within the Tavua Caldera, Fiji: in    Econ. Geol.   v88 pp 1053-1083
Muller D and Groves D I  1993 - Direct and indirect associations between potassic igneous rocks, shoshonites and gold-copper deposits : in    Ore Geology Reviews   v8 pp 383-406
Pals D W, Spry P G, Chryssoulis  2003 - Invisible Gold and Tellurium in Arsenic-rich Pyrite from the Emperor Gold deposit, Fiji: implications for Gold distribution and deposition: in    Econ. Geol.   v98 pp 479-493
Scherbarth N L and Spry P G,  2006 - Mineralogical, Petrological, Stable Isotope, and Fluid Inclusion Characteristics of the Tuvatu Gold-Silver Telluride Deposit, Fiji: Comparisons with the Emperor Deposit : in    Econ. Geol.   v101 pp 135-158
Setterfield T N, Mussett A E, Oglethorpe R D J  1992 - Magmatism and associated hydrothermal activity during the evolution of the Tavua Caldera: 40Ar-39Ar dating of the volcanic, intrusive, and hydrothermal events: in    Econ. Geol.   v87 pp 1130-1140


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