Presentation to minerals industry representatives at the Geological Survey of Western Australia, 4 May 2010.

This report is compiled of four separate reports. (1) "Note on the Application by the Chamber of Mines, W.A." Yield, production, industry costs, and the subsidy proposal are discussed in this report. (2) "Proposal for a Subsidy to the Gold Mining Industry". This report is concerned with details of the economic position of the mines and Western Australian gold industry as a whole. (3) "Supplementary Report on the Proposal for a Subsidy to the Gold Mining Industry". This report summarises the findings of the earlier enquiry into the position of the Western Australian gold industry. (4) "The General Effect on Gold Mine Surplus of Assistance based on Production". The object of this note is to outline briefly some of the principles which require consideration in determining whatever form of assistance may be decided.

A compilation of abstracts of talks and posters presented at the Broken Hill Exploration Initiative (BHEI) 2003 conference at Broken Hill, 7-9 July 2003.

Existing age constraints for geological events in the Tanami Block come predominantly from U-Pb geochronology of i) detrital zircons in sediments, and ii) magmatic zircons in granitoids. These constraints have been used together with observed and inferred geological relationships to help constrain timing of stratigraphy, magmatism, deformation, metamorphism and Aumineralisation (e.g. Vandenburg et al., 2001). Ongoing GA/NTGS zircon geochronology is continuing to refine our understanding of the stratigraphy and magmatic history of the Tanami, with attendant implications for tectonic evolution. In this regard it is noteworthy that detrital zircon ages of ~1815 Ma from the Killi Killi formation require either (or both) a revision of existing stratigraphy, or that the so-called Tanami Orogenic Event significantly post-dates ~1815 Ma, in contrast to previous estimates of ~1845 - 1830 Ma. However, detrital and magmatic zircons can provide no direct constraints on timing of deformation, metamorphism and Au-mineralisation, and consequently our current understanding of these processes in the Tanami region is relatively poor, despite being critical to predictive exploration models.

Proceedings of papers presented at an industry workshop held in Perth, 20 June 2002. Edited by K.F. Cassidy

Geological investigations, survey work, and mapping were carried out in the vicinity of the Tennant Creek gold field between 1948 and 1950. This report provides an overview of the investigations carried out on the Enterprise, Patties, and Eldorado mines. The working, production history, and geological features of these areas are discussed.

The Nunyerrie Asbestos Deposits are associated with a remnant of metamorphosed ultrabasic rocks in granite country, which is part of a group of Pre-Cambrian rocks of Archaean age. The ultrabasics form an east northeast trending ridge about 1 mile long and 250 feet average width, which rises to a maximum elevation of 300 feet above the general level of the surrounding country. The belt of ultrabasics is highly sheared and jointed and consists chiefly of serpentines, but talcose rocks, chlorite schists, authophyllite rock and what appear to be hydro-biotite schists also occur. The ultrabasics have an intrusive junction with the surrounding granite rocks, and they are intruded by quartz veins and granitic dykes. The deposits were investigated by the author. This report gives an overview of the deposits. Workings, production figures, reserves, grades, and prices are described.

This report contains the results of a brief examination carried out from 1st to 7th October 1950 at Maranboy, Northern Territory, by the writer and Dr. J. Sleis, Geologist, who were assisted by the Inspector of Mines, Mr. W.A. McDonald. The purpose of this examination was to obtain the necessary data for a preliminary assessment of the tinfield based on the ore developed and won to date.

Tanami Region, the largest gold province in the Northern Territory, has produced 122 t of gold, has a known remaining resource of 190 t, and has high exploration potential. Most deposits are concentrated in three goldfields - Dead Bullock Soak (DBS), The Granites and Tanami. Significant mineralisation is also located at Groundrush (0.7 Moz Au), Oberon (0.48 Moz Au) and Crusade (0.1 Moz Au) deposits, as well as the Coyote prospect in WA. Gold mineralisation is late in the tectonic cycle, has a spatial assocaition with late orogenic felsic intrusives, and is coincident with late D5 structures. DBS goldfield (remaining resource 23.6 Mt at 5.6 g/t Au) contains stratabound mineralisation in folded greenschist facies siltstone, BIF and chert of the Dead Bullock Formation. At Callie, which is the largest deposit in the Region, mineralisation is in D5 quartz veins associated with fold closures within metasiltstone. It is dominated by free gold (70%) with some auriferous arsenopyrite. The remaining DBS deposits consist of BIF and chert hosted mineralisation associated with arsenopyrite, pyrrhotite and minor pyrite. The Granites goldfield (remaining resource 1.9 Mt at 3.8 g/t Au) comprises stratabound mineralisation within intensly folded amphibolite facies BIF of Dead Bullock Formation. Gold occurs in sulphides (apy, po, py) disseminated in BIF, quartz and quartz-carbonate veins. The Granites goldfield lies in close proximity to Inningarra and The Granites granitic suites (1815?4 and 1795?5 Ma respectively), and is associated with D5 shearing. Tanami goldfield (remaining resource 6.01 Mt at 3.2 g/t Au) comprise auriferous quartz veins in sub-greenschist facies basalt and interbedded sedimentary units of the Mount Charles Formation. Mineralisation is controlled by three sets of D5 faults striking 350-010o, 020-040o, 060-080o and dipping east to southeast. There is a close spatial relationship with the Coomarie and Frankenia granites (1815?4 and 1805?6 Ma respectively). Gold occurs in sulphides (py, apy, po);and vein textures indicate high level mineralisation. Wallrock alteration involves bleaching of basalt and sediments to produce sericite+quartz?pyrite?carbonate assemblages. Groundrush (resource 3.2 Mt at 4.5 g/t Au) comprises auriferous arsenopyrite in quartz veins within dolerite, but structural relations are still not clear. Titania (resource at Oberon 4.1 Mt at 2.6 g/t Au) contains auriferous pyrite and arsenopyrite in D5 quartz veins within detrital and graphitic sediments of the Killi Killi Formation; Minotaur ( resource 1.0 Mt at 2.4 g/t Au) contains auriferous sulphides (apy, po, py) disseminated in lower amphibolite schist of Dead Bullock Formation. Microthermometric and Raman spectroscopic studies of primary fluid inclusions indicate that Callie fluids changed character with time, characterised by decreasing temperature, increasing salinity and changing gas contents. The fluid conditions were 280-400oC and 6-12 wt% NaCl in pre-ore quartz veins; 220-360oC, 8-22 wt% NaCl eq and abundant CO2 in ore-stage quartz veins; 180-320oC and 12-18 wt% NaCl eq in post-ore quartz veins, and 80-160oC and 14-28 wt% NaCl eq in late post-ore carbonate veins. At The Granites goldfield, the main population of ore stage fluid inclusions had a temperatures of 260-312oC and salinity 4-8 wt% NaCl eq. At the Tanami goldfield, the ore fluids had lower temperatures of 120-220oC and salinity below 12 wt% NaCl eq; fluids here were largely degased. At Groundrush, ore fluids had the highest temperatures of 390-430oC and salinity of 4-10 wt% NaCl eq. Groundrush fluids also contained CO2 and exceptionally high CH4. Based on fluid inclusion data, estimated depths of mineralisation were 8.3 to 5.5 km for Groundrush, 7.5 to 3.8 km for The Granites goldfield, 5.8 to 3.2 km for Callie and 1.5 to 0.4 km for the Tanami goldfield.

Three geologists left Australia in 1951 to conduct geological surveys in Pakistan, under the auspices of the Colombo Plan which provides technical assistance for member countries in South and South East Asia. The main objects were to conduct an economic and general geological survey of a selected part of the Gilgit Agency, to examine the alluvial-gold prospects of the Chitral River, and, if time permitted, to discuss the Sind and East Bengal lignites with the Director of the Pakistan Geological Survey. This report is confined to the geological surveys in the Gilgit Agency. In June 1951, the party commenced field work from Gilgit, and spent three month in the region. Several reported mineral occurrences were examined in the Hunza, Nagir, Gilgit, Haramosh, Gupis, Ishkuman, and Yasin areas; a regional geological survey of approximately 5,000 square miles was completed.