Legacy product - no abstract available

Legacy product - no abstract available

At the invitation of Newercrest Mines Limited I visited the Telfer Gold Mine from Tuesday July 12, returning on Thursday morning July 13th. Whilst at the site, I visited the open pit accompanied by Don Thompson, and with Don, Nick Langsford and Campbell Mackey visited sites of the Mount Crofton Granite at Mount Crofton, Minyari Granite at Minyari Hills, and the Wilkie Granite some 15 kms east of the Telfer mine. I also examined granite core in holes ORC 1-6. These notes describe my thoughts on the sites that I visited, and also give some recommendations for some potential future work. I have prepared these notes at the request of Nick Langsford and they contain information that is essentially off the top of my head. Please note that they are not meant to be comprehensive and that I have not had time to validate anything that is within them. I prepared these at the Newcrest Office in Perth on Thursday afternoon of July l3th and that I did some minor refinements to them back at AGSO on July 17th.

This report records the findings of a consultancy undertaken by the Minerals and Land Use Division of the Australian Geological Survey Organisation on behalf of North Flinders Mines. The two general objectives of this consultancy were (1) to form an opinion of the prospectivity of the Tanami region (particularly NFM tenements) for unconformity-associated Au-Pt-Pd±U mineralisation (2) to advise on exploration indicators of such mineralisation to be expected in the Tanami Region.

Not available

A completion report to AusAID for this Activity which details the progress acheived, lessons leanrt and potential future directions.

Not available

This study was aimed at testing whether the regional tectonostratigraphic history established for Australia's premier hydrocarbon province, the North Carnarvon Basin, is applicable to the less well endowed, western Exmouth Sub-basin on its southern margin. This was achieved through the first systematic analysis of the structural architecture of the basin utilising 3D seismic and potential field data. Analysis focused on the Late Triassic to present basin history which highlighted some significant departures from the established tectonostratigraphic paradigm. The results indicate rifting occurred in two separate events. The first occurred under an east-west paleostress field and developed north striking faults controlled by Phanerozoic and Carbonifer to Permian pre-rift structures. This phase of basin development climaxed in the Callovian which resulted in the development of a significantly under filled basin and the deposition of anoxic petroleum source rocks. The first phase of rifting ceased in the Oxfordian and was followed by post-rift subsidence and later, previously unrecognised, Oxfordian to Tithonian south directed inversion localised above Proterozoic basement west-northwest oriented structures. This inversion event occurred under a detached stress filed which resulted in the formation of doubly plunging fault propagation anticline above south directed thrusts which terminated at a depth of 5-6 km. accompanied by contemporaneous extension along north to north-northeast striking fault segments in the upper most crust. Inversion ceased at the base of the Cretaceous and was followed by the second phase of rifting this time under west-northwest extension which resulted in rift fault system reorganisation and new normal fault growth. Rifting terminated at the onset of nearby Valanginian sea floor spreading. Post-rift thermal subsidence followed punctuated by variably directed periods of basin inversion over the last 130 Myrs. This long phase of inversion was enabled by an abnormally thick pre-rift lithosphere which took a long time to cool following rifting and hence could accommodated shortening over this long time span. A consideration of this thick lithosphere in hydrocarbon charge modelling in the Exmouth Sub-basin may lead to a change in the prevailing view that the main hydrocarbon charge occurred before the deposition of the regional seal, thereby making this apparently less well endowed basin more prospective for future exploration. A new understanding of the tectonstratigraphic evolution of the area has also highlighted new petroleum plays in previously un recognised structures some of which have been unaffected by Valanginian fresh water flushing and hence may contain non-biodegraded hydrocarbons.

Report on calibration of NAS Nowra compass swing site.

This summary of biostratigraphic data derived from Blackstone No. 1 well is based on the well completion report (Johnson 1968), and various other published and unpublished sources which update the original information. No samples have been re-examined. This well is important in that it formed the basis for the informal palynological zonation for the Permian presented by B.E. Balme in Kemp et al. (1977). The type section for the' Poulton Formation of Playford et al. (1975) is also in Blackstone #1.