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  • <p><b>Report 1 of 5</b> <p>Broken Hill Managed Aquifer Recharge (BHMAR) Project <p>Securing Broken Hill's Water Supply: Assessment of Conjunctive Water Supply Options Involving Managed Aquifer Recharge and/or Groundwater Extraction at Menindee Lakes <p>Prepared For: The Australian Government Department of the Environment

  • Geochemical surveys for copper in soil and bed rock were made over 6 magnetic anomalies in the Tennant Creek Gold-Field, Anomalous amounts of copper were found to be coincident with magnetic anomalies at Orlando and Golden Forty North. Samples from the known ironstone bodies cropping out in the Tennant Creek 1-mile area were analysed for copper to determine the regional distribution of copper in ironstone. Statistical treatment of the results suggests that at least 8 of these bodies merit further attention. During the course of the field work action was taken by Peko Mines N.L. to test the Orlando magnetic-geochemical anomaly and gold-copper mineralization has since been disclosed at depth. Recommendations for drilling magnetic-geochemical anomalies at Golden Forty North and Cat's Whiskers, and for further geochemical prospecting, are mad

  • Microalgal blooms are one of the most visible responses to anthropogenic nutrient loadings in coastal ecosystems. However, differentiating sources of nutrients causing blooms remains a challenge. The response of phytoplankton and benthic microalgae (BMA) to nutrient loads was compared across tidal creeks with and without secondary treated sewage in a tropical estuary. Concentrations of the sewage marker, coprostanol, were higher near sewage discharge points and decreased downstream. This was commensurate with a decline in nitrogen and phosphorus concentrations suggesting that sewage was the main source of nitrogen and phosphorus. Primary productivity in the water column was limited by nitrogen availability in absence of sewage, with nitrogen saturation in the presence of sewage. Phytoplankton primary productivity rates and chlorophyll a concentrations increased in response to sewage, and there was a greater response than for BMA. There was no evidence of a change in algal pigment proportions within the phytoplankton or BMA communities. This study highlights the scale and type of response of algal communities to sewage nutrients in situ.

  • <p>The onshore Canning Basin in Western Australia is the focus of a regional hydrocarbon prospectivity assessment being undertaken by the Exploring for the Future (EFTF) program; an initiative by the Australian Government dedicated to boosting investment in resource exploration in Australia. The four-year program led by Geoscience Australia focusses on the acquisition of new data and information about the potential mineral, energy and groundwater resources concealed beneath the surface in northern Australia and parts of South Australia. As part of this program, significant work has been carried out to deliver new pre-competitive data including new seismic, drilling of a stratigraphic well and the geochemical analysis of petroleum recovered from exploration wells. <p>Current conventional remaining gas resources of the Canning Basin are deemed limited (0.2 TCF; AERA, 2018), whereas unconventional gas resources are inferred to be extremely high, with estimated recoverable resources for shale gas and tight gas being 452.3 TCF (5% of P50,Table 2; AREA, 2018). This disparity arises from the high degree of uncertainty of key geological factors, particularly the poor constraints on source rock volumetrics, the lack of understanding of the volume of gaseous hydrocarbons generated and the origin and degree of thermal maturity of the gases. Carbon isotopic data are scarce and hydrogen isotopic data are non-existent, even though numerous gas discoveries have been made across the Lennard Shelf, Broome Platform and Fitzroy Trough following the initial discovery at Pictor 1 in 1984 by BHP Petroleum (Cadman et al., 1993; Jonasson, 2001). Indeed, gas samples have only been available for analyses since the drilling campaign by Buru Energy in 2010, and more recently, mud gases collected in IsoTubes are routinely sampled during drilling and presented in well completion reports (e.g. Cyrene 1; Nicolay 1, Paradise Deepening 1, Theia 1, Yulleroo 3 and Yulleroo 4). <p>This component of the EFTF program, evaluates the molecular and isotopic composition of natural gases from petroleum wells and a hot-spring seep at Mount Wynne, to constrain the much publicised resource potential inferred in this basin. Interpretation of these data will also assist with in the determination of their origin, and hence increase our understanding of the Larapintine Petroleum Supersystem, as proposed by Bradshaw (1983) and Bradshaw et al. (1984). All gas analyses in this study were undertaken by Geoscience Australia’s Organic Geochemistry Laboratory.