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Rosebery

Tasmania, Tas, Australia

Main commodities: Zn Pb Au Cu Ag
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The Rosebery volcanic hosted massive sulphide ore copper, zinc, lead, silver, gold deposit is located ~195 km NW of Hobart and 90 km SSW of Burnie and 25 km NE of Zeehan on the west coast of Tasmania (#Location: 41° 46' 24"S, 145° 32' 35"E).

The deposit is hosted by the Central Volcanic Complex of the 250 km long, middle to late Cambrian Mt Read Volcanic Arc on the west coast of Tasmania, Australia.   To the north-west of the Henty Fault this complex is composed of rhyolitic to dacitic acid lavas and pyroclastics with a higher andesites content than those to the south-east of this same structure and is the host to major Zn-Pb-Cu-Ag-Au mineralisation.   The Central Volcanic Complex is unconformably overlain by the keratophyric tuffs, massive agglomerates, conglomerates, sandstones, shales and limestones of the Tyndall Group.   During the Devonian shallow level post-tectonic granitoids intruded the mine area and resulting in metamorphism and recrystallisation of the ores.

In the immediate mine area the host sequence is composed of the following from bottom to top:
• Footwall Pyroclastics - >300 m of mainly pumiceous rhyolitic to dacitic, feldspar-phyric ash flow tuffs, commonly altered to schistose quartz-sericite ± chlorite ± pyrite beneath the ore,
• Tuffaceous Shale (the ore host) - 35 to 200 m thick, a bedded volcaniclastic sandstone and siltstone, generally strongly altered to schistose sericite ± quartz ± carbonate ± chlorite ± pyrite near ore,
• Black Slate - the immediate hangingwall - 0 to 70 m thick,
• Hangingwall Pyroclastics (epiclastics) - 50 to >200 m thick, commonly rhyolitic to dacitic volcaniclastic breccia,
• Mount Black Volcanics (dacitic to andesitic lavas) - >1000 m thick.
This sequence is truncated immediately to the west of the ore zone by the high angle reverse Rosebery Fault.

The orebodies are tabular sheets up to 10 m or more thick, dipping at 45°E.   They extend over a strike length of 4 km north-south and down plunge to a depth of more than 1.5 km. They form an annular composite body made up of a series of overlapping lenses surrounding a siliceous core carrying stringer pyrite-chalcopyrite.

There is a vertical zonation of mineralogy from bottom to top of:
• Disseminated pyrite-chlorite,
• Massive pyrite-chalcopyrite,
• Massive sphalerite-galena-pyrite with minor tetrahedrite, arsenopyrite and gold.   This ore displays a strong mineralogical banding developed parallel to both lithological contacts and the well developed cleavage,
• Barite-carbonate zone,
• Hematite rich tuff.
Overall the ore minerals comprise 25% sphalerite, 5% galena, and 3% chalcopyrite with 30% pyrite with minor amounts of tetrahedrite, pyrrhotite and arsenopyrite.

Production and reserve figures in 1990 were:
    Historic production - 15.3 Mt @ 0.7% Cu, 4.8% Pb, 15.7% Zn, 159 g/t Ag, 2.8 g/t Au,
    Reserves - 8.0 Mt @ 0.5% Cu, 3.5% Pb, 10.4% Zn, 109 g/t Ag, 2.8 g/t Au.

According to Large, et al. (2001), production + resources were:
    31.7 Mt @ 0.6% Cu, 4.4% Pb, 14.3% Zn, 146 g/t Ag, 2.3 g/t Au.

According to Seymour et al. (2007), the total production + resources were estimated at:
    34.03 Mt @ 0.57% Cu, 4.1% Pb, 13.8% Zn, 143 g/t Ag, 2.2 g/t Au.

Remaining reserve in 2007 were (Zinifex, 2007):
    11.7 Mt @ 0.42% Cu, 3.83% Pb, 13.0% Zn, 138 g/t Ag, 1.9 g/t Au.

Remaining measured + indicated + inferred mineral resources at 30 June, 2014 were (MMG, 2014):
    17.2 Mt @ 0.4% Cu, 3.6% Pb, 11.3% Zn, 123 g/t Ag, 1.7 g/t Au,
Remaining proved + probable ore reserves at 30 June, 2014 were (MMG, 2014):
    5.4 Mt @ 0.3% Cu, 3.4% Pb, 9.7% Zn, 115 g/t Ag, 1.4 g/t Au.
Rosebery section

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

The most recent source geological information used to prepare this summary was dated: 2007.     Record last updated: 26/11/2015
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd.   Unauthorised copying, reproduction, storage or dissemination prohibited.


Rosebery

  References & Additional Information
 References to this deposit in the PGC Literature Collection:
Berry M V, Edwards P W, Georgi H T, Graves C C, Carnie C W A, Fare R J, Hale C T, Helm S W, Hobby D J, Willis R D  1998 - Rosebery lead-zinc-gold-silver-copper deposit: in Berkman D A, Mackenzie D H (Ed.s), 1998 Geology of Australian & Papua New Guinean Mineral Deposits The AusIMM, Melbourne   Mono 22 pp 481-486
Bishop J R, Lewis R J G  1992 - Geophysical signatures of Australian volcanic-hosted massive sulfide deposits: in    Econ. Geol.   v87 pp 913-930
Brathwaite R L,  1974 - The Geology and Origin of the Rosebery Ore Deposit, Tasmania : in    Econ. Geol.   v.69 pp. 1086-1101
Burton C C J  1975 - Rosebery zinc-lead-copper orebody: in Knight C L, (Ed.), 1975 Economic Geology of Australia & Papua New Guinea The AusIMM, Melbourne   Mono 5 pp 619-626
Corbett K D  1981 - Stratigraphy and mineralization in the Mt Read volcanics, western Tasmania: in    Econ. Geol.   v76 pp 209-230
Corbett K D  1992 - Stratigraphic-volcanic setting of massive sulphide deposits in the Cambrian Mount Read Volcanics, Tasmania: in    Econ. Geol.   v87 pp 564-586
Eastoe C J, Solomon M, Walshe J L  1987 - District-scale alteration associated with massive Sulfide deposits in the Mount Read Volcanics, western Tasmania: in    Econ. Geol.   v82 pp 1239-1258
Gifkins C C, Allen R L  2001 - Textural and chemical characteristics of diagenetic and hydrothermal alteration in glassy volcanic rocks: examples from the Mount Read Volcanics, Tasmania: in    Econ. Geol.   v96 pp 973-1002
Green G R, Solomon M, Walshe J L  1981 - The formation of the volcanic-hosted massive sulfide ore deposit at Rosebery, Tasmania: in    Econ. Geol.   v76 pp 304-338
Large R R  1992 - Australian volcanic-hosted massive sulfide deposits: features, styles, and genetic models: in    Econ. Geol.   v87 pp 471-510
Large R R, Allen R L, Blake M D, Herrmann W  2001 - Hydrothermal alteration and volatile element halos for the Rosebery K Lens volcanic-hosted massive Sulfide deposit, western Tasmania: in    Econ. Geol.   v96 pp 1055-1072
Large R R, McPhie J, Gemmell J B, Herrmann W, Davidson G J  2001 - The spectrum of ore deposit types, volcanic environments, alteration halos, and related exploration vectors in submarine volcanic successions: some examples in Australia: in    Econ. Geol.   v96 pp 913-938
Lees T, Zaw K, Large R R, Huston D L  1990 - Rosebery and Hercules Copper-Lead-Zinc deposits: in Hughes F E (Ed.), 1990 Geology of the Mineral Deposits of Australia & Papua New Guinea The AusIMM, Melbourne   Mono 14, v2 pp 1241-1247
Lees T. Khin Zaw, Large R R, Huston D L  1990 - Rosebery and Hercules Copper-Lead-Zinc Deposits: in Hughes Fe (Ed) 1990 Geology of the Mineral Deposits of Australia and Papua New Guinea The AusIMM, Melbourne   v2 pp 1241-1247
Smith R N, Huston D L  1992 - Distribution and association of selected trace elements at the Rosebery Deposit, Tasmania: in    Econ. Geol.   v87 pp 706-719
Solomon M  1981 - An introduction to the geology and metallic ore deposits of Tasmania: in    Econ. Geol.   v76 pp 194-208
Solomon M, Eastoe C J, Walshe J L, Green G R  1988 - Mineral deposits and Sulfur isotope abundances in the Mount Read volcanics between Que River and Mount Darwin, Tasmania: in    Econ. Geol.   v83 pp 1307-1328
Solomon M, Vokes F M and Walshe J L,  1987 - Chemical remobilization of volcanic-hosted sulphide deposits at Rosebery and Mt. Lyell, Tasmania: in    Ore Geology Reviews   v2 pp 173-190
Zaw K, Huston D L, Large R R  1999 - A chemical model for the Devonian remobilization process in the Cambrian volcanic-hosted massive Sulfide Rosebery deposit, western Tasmania: in    Econ. Geol.   v94 pp 529-546


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