Tanami, The Granites, DBS / Dead Bullock Soak, Callie, Villa, Triumph Hill, Colliwobble

Northern Territory, NT, Australia

Main commodities: Au
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The Tanami Operations are located approximately 550 km to the NW of Alice Springs in the Tanami Desert of the Northern Territory, Australia.

Gold was first discovered in the Tanami region in 1900, although the first significant deposit was not delineated until 1983 at The Granites, with the first gold pour in 1986. Subsequent exploration has located a series of deposits 40 km to the west mined from the Callie, Villa, Dead Bullock Ridge, Triumph Hill and Colliwobble pits and the Dead Bullock Soak underground mine, which are spread over a length of 3 km. Open pit mining commenced on these deposits in 1991, and by 1999 had extracted 62 t (2 Moz) of gold.

The orebodies at Dead Bullock Soak / Callie deposits are grossly stratabound and hosted within units of the Mt Charles Beds, a member of the complexly deformed Palaeoproterozoic Tanami Complex, a sequence of fine to medium grained clastic, minor chemical meta-sediments (banded iron formations), and a large body of semi-conformable dolerite.

The Mt Charles Beds comprise the basal Blake Beds, a generally monotonous sequence of fine grained meta-pelite with carbonaceous and rare chert beds. This unit hosts the Callie orebody. They are overlain by the Davidson Beds, which include the lower Orac Iron Formation (banded cherts and siliceous amphibole schist) and the overlying Schist Hill Formation (similar to the Orac Formation). The former hosts the Villa, Fumarole and Avon deposits, while the latter contains the Triumph Hills, Dead Bullock Ridge, Colliwobble Ridge and Sleepy Hollow mineralisation. The youngest unit, the Madigan Beds, are flysch greywacke and siltstones and have no known significant mineralisation.

The ore at Callie is contained within irregularly spaced thin (2 to 50 mm thick) quartz veins that dip steeply to the south at 70 to 80° and strike ENE, hosted by chlorite-sericite schist and are found over broad stratigraphic intervals. The controls on mineralisation are predominantly the Callie structural corridor, coarser lithologies with a greater porosity and carbon content, and in the most altered zone of schists. In other deposits, the ore grade mineralisation appears to be tightly constrained by the presence of the host Orac and Schist Hill iron formations.

The identified mineral resource in the iron formation deposits totalled 6.4 Mt @ 3.5 g/t Au at the end of 1996, while the Dead Bullock Soak (Callie) style mineralisation had a resource of 16.2 Mt @ 5.6 g/t Au for 90 t of contained Au.

Production from the operation during 2007 totalled 13.65 t of recovered Au (Newmont, 2008).
The remaining reserve at the end of 2007 totalled 5.8 t of contained Au in a proved + probable reserve of:
      11.63 Mt @ 4.47 g/t Au.

The most recent source geological information used to prepare this summary was dated: 2007.    
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.

  References & Additional Information
   Selected References:
Adams G J, Both R A and James P,  2007 - The Granites gold deposits, Northern Territory, Australia: evidence for an early syn-tectonic ore genesis : in    Mineralium Deposita   v42 pp 89-105
Anonymous  1998 - Granites, The Dead Bullock Soak (NFM): in    Register of Australian Mining 1997/98    pp 202-203
Anonymous  1998 - North Flinders Mines Limited: in    Extracts form the North Flinders Mines Ltd 1996 Annual Report    pp 1, 3-11
Anonymous  1998 - Normandy Mining Limited: in   Extracts from the Normandy Mining Limited 1997 Annual Report    pp 12-14, 17, 26-28.
Bagas L, Huston D L, Anderson J and Mernagh T P,  2007 - Paleoproterozoic gold deposits in the Bald Hill and Coyote areas, Western Tanami, Western Australia : in    Mineralium Deposita   v42 pp 127-144
Crispe A J, Vandenberg L C and Scrimgeour I R,   2007 - Geological framework of the Archean and Paleoproterozoic Tanami Region, Northern Territory : in    Mineralium Deposita   v42 pp 3-26
Cross A J and Crispe A J,   2007 - SHRIMP U–Pb analyses of detrital zircon: a window to understanding the Paleoproterozoic development of the Tanami Region, northern Australia : in    Mineralium Deposita   v42 pp 27-50
Huston D L, Vandenberg L, Wygralak A S, Mernagh T P, Bagas L, Crispe A, Lambeck A, Cross A, Fraser G, Williams N, Worden K, Meixner T, Goleby B, Jones L, Lyons P, Maidment D,   2007 - Lode–gold mineralization in the Tanami region, northern Australia : in    Mineralium Deposita   v42 pp 175-204
Lambeck A, Huston D and Barovich K,  2010 - Typecasting prospective Au-bearing sedimentary lithologies using sedimentary geochemistry and Nd isotopes in poorly exposed Proterozoic basins of the Tanami region, Northern Australia: in    Mineralium Deposita   v.45 pp. 497-515
Lovett D R, Smith M E H, Pring P I, Sando B G  1997 - The Dead Bullock Soak Gold Deposits: in Berkman D A, Mackenzie D H (Eds),  Geology of Australian and Papua New Guinean Mineral Deposits The AusIMM, Melbourne    pp 449-460
Mayer T E  1990 - The Granites Gold field: in Hughes F E (Ed.), 1990 Geology of the Mineral Deposits of Australia & Papua New Guinea The AusIMM, Melbourne   Mono 14, v1 pp 719-724
Mernagh T P and Wygralak A S,   2007 - Gold ore-forming fluids of the Tanami region, Northern Australia : in    Mineralium Deposita   v42 pp 145-173
Nicholson P M  1990 - Tanami Gold deposit: in Hughes F E (Ed.), 1990 Geology of the Mineral Deposits of Australia & Papua New Guinea The AusIMM, Melbourne   Mono 14, v1 pp 715-718
Petrella, L., Thebaud, N., Fougerouse, D., Evans, K., Quadir, Z. and Laflamme, C.,  2020 - Colloidal gold transport: a key to high-grade gold mineralization?: in    Mineralium Deposita   v.55, pp. 1247-1254.
Scrimgeour I, Sandiford M  1993 - Early Proterozoic metamorphism at the Granites Gold mine, Northern Territory: implications for the timing of fluid production in high-temperature, low-pressure terranes: in    Econ. Geol.   v88 pp 1099-1113
Tunks A J and Cooke D R,  2007 - Geological and structural controls on gold mineralization in the Tanami District, Northern Territory : in    Mineralium Deposita   v42 pp 107-126
Tunks A, Marsh S  1998 - Gold deposits of the Tanami Corridor: in Berkman D A, Mackenzie D H (Ed.s), 1998 Geology of Australian & Papua New Guinean Mineral Deposits The AusIMM, Melbourne   Mono 22 pp 443-448
Williams N C,   2007 - The role of decarbonization and structure in the Callie gold deposit, Tanami Region of northern Australia : in    Mineralium Deposita   v42 pp 65-87

Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge.   It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published.   While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo takes no responsibility what-so-ever for inaccurate or out of date data, information or interpretations.

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