From 1 - 10 / 830
  • The Tanami region has become one of Australia?s premier Proterozoic gold provinces, having already produced 122 t of gold, and still has high exploration potential. This region contains more than 60 gold occurrences including three established gold fields (Dead Bullock Soak, The Granites and Tanami) as well as several significant gold prospects (Groundrush, Titania, Crusade, coyote and Kookaburra). The Callie deposit (>5 Moz total resource) located in the Dead Bullock Soak goldfield is currently the largest mine in this region. Fluid inclusion studies indicate that the ore fluids in the Dead Bullock Soak and The Granites goldfields were low to moderate salinity (4 ? 10 wt.% NaCl eq), moderate to high temperature (260 ? 460 ?C) and gas rich. In contrast, ore fluids in the Tanami goldfield were low temperature (120 ? 220 ?C) with only minor CO2. O and H isotopic data are consistent with either a metamorphic or magmatic origin for the ore fluids with some mixing with meteoric fluids evident in the Tanami district. The fluid inclusion data also indicate that the deposits have formed over a range of physico-chemical conditions and depths. Groundrush appears to have formed at the greates depths and has the most reduced (CH4-rich) fluids. The Granites goldfield and the Callie deposit formed at shallower depths. The Granites fluids were CO2-rich but also had variable N2 and CH4. The Callie fluids show only small variations in temperature and salinity and are more oxidised with only CO2 and N2 being detected. The Tanami deposits appear to have formed at the shallowest levels and are dominated by low-salinity aqueous fluids, although some CO2-bearing fluids have also been detected. Considerable uncertainty surrounds the age of gold mineralisation. The spatial relationship between many of the gold deposits and granitoids has led to proposed genetic links between granite intrusion and mineralisation. These granites have since been dated at between 1825 and 1795 Ma. Preliminary 40Ar/39Ar results from sericite from the Carbine pit in the Tanami goldfield yields a total gas age of 1810 Ma, i.e. similar to the age of the granites. However, 40Ar/39Ar analysis of biotite in mineralised veins from Dead Bullock Soak indicate an age of 1720 ? 1700 Ma. This suggests that mineralisation at Callie may be related to fluid migration driven by the Late Strangways Orogeny that was responsible for widespread deformation and metamorphism in the Arunta Province to the south-east. Results of this study indicate that gold deposits of the Tanami region are surprisingly diverse, with some being basalt and dolerite hosted, some in banded iron formations and some being sediment hosted. Moreover, fluid inclusion data shows that the deposits formed over a range of depths and 40Ar/39Ar dating may indicate the occurrence of more than one mineralising event. Consideration of this diversity from a mineral systems perspective, highlights the likelihood that undiscovered gold deposits in the Tanami region will have a range of characteristics and may occur in a number of different lithologies.

  • The North Pilbara Terrane has the largest variety of mineral deposits of any Archaean province. It contains the oldest known examples of volcanic-hosted massive sulphide (VHMS), lode Au, porphyry Cu, orthomagmatic Ni-Cu-PGE-V, pegmatitic Ta-Sn and epithermal deposits, with a diversity more characteristic of Phanerozoic mobile belts. Despite this diversity the North Pilbara Terrane appears to lack any major mineral deposits, with the exception of the Wodgina Ta-Sn pegmatite field. Below, we present the metallogenic history of the North Pilbara Terrane in the context of its tectonic development and then compare it to other Archaean provinces to assess controls on metal endowment.

  • The map shows iron ore resources of Australia

  • Elizabeth Creek project : buried mineral play in Century- equivalent strata, northern Lawn Hill Platform, Queensland. At foot of title: Prospectivity data package: Queensland Department of Mines and Energy restricted area 298

  • Australian mineral exploration spending in 2005-06 rose by 20.6% to a record $1240.7 million, 36.9% of which was spent on the search for new deposits. Western Australia dominated with 47.6% of Australian mineral exploration spending while South Australia, New South Wales, Victoria and Queensland had record expenditure. Tasmanian spending rose by 172%. Gold remained the main target, but its share of spending was eroded by growth in nickel, copper, iron ore, coal and uranium exploration. Exploration results were announced for a wide range of commodities from across the country including: Mineral sands (Gullivers, South Australia, and Cooljarloo North, Western Australia) Nickel (Saxon, Tasmania) Gold-copper (Tekapo, Northern Territory) Gold (Tandarra, Victoria, and Tropicana, Western Australia) Base metals (Cuttaburra, New South Wales) Copper (Rocklands, Queensland)

  • Australian mineral exploration spending in 2006-07 rose by 38% to a record $1,714.6 million of which 36% was spent on the search for new deposits. Spending rose in all States and the Northern Territory with South Australia up by 78% to $260.7 million while Western Australia dominated with 49% of Australian mineral exploration spending. The base metal group was the dominant target accounting for 32% of exploration spending overtaking gold (27%) for the first time since 1983. Exploration results were announced for a wide range of commodities from across the country with the most significant being the announcement of a 38% increase in contained copper in the Olympic Dam deposit, South Australia, and of an initial 4 Moz resource in the Tropicana gold deposit, Western Australia.

  • In 2001, Australia's economic demonstrated resources (EDR) of bauxite, copper, gold, lead, magnesite, ilmenite, zircon, nickel, phosphate, PGM, tantalum, silver, vanadium and zinc increased, while those of black coal, diamonds, iron ore, lithium, manganese ore and uranium decreased. EDR of brown coal was maintained at levels similar to those reported in 2000. The reductions in EDR were due mainly to ongoing high levels of production; with low commodity prices a subsidiary factor. EDR of gold, nickel and mineral sands reached record levels. Gold EDR rose by 4% and was over 80% of total demonstrated resources, this increase in resources continuing the established long-term growth trend for gold. In recent years that trend has continued despite falling exploration expenditure reflecting an increasing trend to concentrate exploration efforts in brownfields regions in response to the sustained period of depressed gold price. Australia, continues to rank as one of the world's leading mineral resource nations. It has the world's largest EDR of lead, mineral sands, nickel, silver, tantalum, uranium and zinc. In addition, its EDR is in the top six worldwide for bauxite, black coal, brown coal, cobalt, copper, gold, iron ore, lithium, manganese ore, rare earth oxides and gem/near gem diamond. Mineral exploration expenditure rose by 1% to $683.3 million in 2000-01, which was the first increase in annual exploration spending since 1996-97. However spending for calendar year 2001, based on the sum of ABS four-quarter figures, was down by $12 million to $664.4 million. Production of many mineral commodities again reached record levels in 2000-01, and overall mine production is projected by ABARE to rise in the five years to 2006-07 with the exception of gold which they forecast will fall by 6%. ABARE have projected a very high growth of some 60% for mine production of nickel in this period. Increases are also forecast for mine production of coal (+17%), copper (4%), lead (3%), zinc (12%), bauxite (17%) and iron ore (19%).

  • Australia's mineral resources have been sustained at adequate levels, relative to production, through continued exploration at known deposits and successful exploration in greenfield regions. At a number of mines, resources have increased progressively despite mining over an extended period. Increased efficiencies in mining and processing, achieved through application of new technology, have resulted in higher recoveries of minerals from many deposits.

  • Geoscience Australia provides information on the nation's future capacity to produce mineral resources. Australia's Identified Mineral Resources is an annual nation-wide assessment of Australia's ore reserves and mineral resources. All major and a number of minor mineral commodities mined in Australia are assessed. It includes international rankings, summaries of significant exploration results, brief reviews of mining industry developments, and an analysis of mineral exploration expenditure across the States and Northern Territory. AIMR provides governments, industry, the investment sector and general community with an informed understanding of Australia's known mineral endowment and level of exploration activity. An important objective is to monitor whether resources are being discovered and developed for production at rates sufficient to maintain Australia's position as a major supplier of mineral commodities. Australia's economic demonstrated resources (EDR) for the following 18 mineral commodities increased during 2007 - antimony, bauxite, cobalt, copper, gold, iron ore, manganese ore, ilmenite, rutile, zircon, molybdenum, nickel, rare earths, silver, tungsten, uranium, vanadium and zinc. In the same period, EDR of eight commodities - black coal, cadmium, diamonds (gem and industrial), lead, niobium, phosphate rock, platinum group metals and tantalum decreased. EDR for brown coal, lithium, magnesite, shale oil and tin remained at levels similar to those reported in 2006. Increases in EDR were due to on-going drilling and evaluation of known deposits resulting in the transfer (re-assessment) of resources from inferred or sub-economic categories into EDR and the discovery of new deposits or extensions of known deposits. Sustained increases in prices for most metal and mineral commodities over recent years has allowed companies to re-assess the economic viability of lower grade resources and deposits which previously were considered to be uneconomic. Overall this has contributed to an increase in EDR for many metal and mineral commodities.