uranium
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The greater Eromanga Basin is an intracratonic Mesozoic basin covering an area of approximately 2,000,000 km2 in central and eastern Australia. The greater Eromanga Basin encompasses three correlated basins: the Eromanga Basin (central and western regions), Surat Basin (eastern region) and the Carpentaria Basin (northern region). The greater Eromanga Basin hosts Australia's largest known resources of groundwater as well as major onshore hydrocarbon resources, including significant coal bed methane (CBM) that has been discovered in recent years, and also contains extensive hot-sedimentary aquifer geothermal energy systems. Additionally, the basin has potential as a greenhouse gas sequestration site and will likely play a key role in securing Australia's energy future. Finally, although no major metallic mineral deposits are currently known in the greater Eromanga Basin, there is significant potential for undiscovered uranium mineralisation. A 3D geological map has been constructed for the greater Eromanga Basin using publicly available datasets. These are principally drilling datasets (i.e. water bores; mineral and petroleum exploration wells) and the 1:1,000,000 scale Surface Geology Map of Australia. Geophysical wireline logs, hydrochemistry, radiometrics, magnetic and gravity datasets were also integrated into the 3D geological map. This study has highlighted the potential of the southwest margin of the Eromanga Basin and the Euroka arch region to contain sandstone-hosted uranium mineral systems. The report demonstrates how incorporating disparate datasets in a 3D geological map can generate an integrated mapping solution with diverse applications: 1. Provide new insights into the geology and geodynamic evolution of the basin. 2. Identify hydrocarbon resource plays. 3. Assess the basin's mineral potential (e.g., sandstone-hosted uranium mineral systems). 4. Assess the basin's geothermal potential (e.g., hot-sedimentary aquifer geothermal systems). 5. Provide resource management information (e.g., groundwater). 6. Identify potential contaminants in groundwater.
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The Frazer Uranium Prospect was located by the Bureau of Mineral Resources airborne scintillometer survey in 1952. Subsequent geological and geophysical investigation has shown that radioactivity is apparently confined to the ferruginous zone of the laterite profile. The maximum activity recorded on the surface was equivalent to 7.5 times background. A costean was bulldozed and a supplementary hole in the deepest part of the costean showed that activity dropped appreciably with depth, at one point it dropped to 2 x background in ten feet.
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The radiometric, or gamma-ray spectrometric method, measures the natural variations in the gamma-rays detected near the Earth's surface as the result of the natural radioactive decay of potassium (K), uranium (U) and thorium (Th). The data collected are processed via standard methods to ensure the response recorded is that due only to the rocks in the ground. The results produce datasets that can be interpreted to reveal the geological structure of the sub-surface. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose. This Thomson Orogen, Qld, 2011 (P1248), radiometric line data, AWAGS levelled were acquired in 2011 by the QLD Government, and consisted of 298198 line-kilometres of data at 400m line spacing and 80m terrain clearance. To constrain long wavelengths in the data, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of the survey data. This survey data is essentially levelled to AWAGS.
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The radiometric, or gamma-ray spectrometric method, measures the natural variations in the gamma-rays detected near the Earth's surface as the result of the natural radioactive decay of potassium (K), uranium (U) and thorium (Th). The data collected are processed via standard methods to ensure the response recorded is that due only to the rocks in the ground. The results produce datasets that can be interpreted to reveal the geological structure of the sub-surface. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose. The terrestrial dose rate grid is derived as a linear combination of the filtered K, U and Th grids. A low pass filter is applied to this grid to generate the filtered terrestrial dose rate grid. This GSQ Thomson Extension doserate grid geodetic has a cell size of 0.00083 degrees (approximately 88m) and shows the terrestrial dose rate of the Thomson Extension, Qld, 2011. The data used to produce this grid was acquired in 2011 by the QLD Government, and consisted of 46530 line-kilometres of data at 400m line spacing and 80m terrain clearance.
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The prospect was a second order anomaly located by the Airborne Scintillometer Survey of 1952. After preliminary ground investigation, a survey grid was set out by the geophysical section. The base line runs east-west for 800 feet. The traverse lines are spaced 100 feet apart and pegged at intervals of 100 feet. The detailed radioactive coverage constituted the main survey. Plate 1 shows the results of this survey. Area No. 2 was the first located and the grid was laid out with the outlining of this area in view. As work progressed area 1 was discovered and later area 3. Time did not allow the grid to be extended to indicate clearly the third area. A detailed magnetic survey supplemented the geiger work. The results are shown on Plate 2. The work commenced in July and was completed in September, 1953.
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Sediments of the Brock's Creek Group and of the Phillips Creek Formation, and volcanics of the Edith River Formation were prospected with carborne radiometric equipment. A comparatively high background count was recorded in the Edith River Volcanics, but no significant radiometric anomaly was found. A geological party prospected ten shear zones south east of the Edith Siding, including a cupriferous one, and a strongly fractured belt near the granite contact. No radiometric anomaly was found. Future prospecting should be directed towards major faults within the sediments.
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The radiometric, or gamma-ray spectrometric method, measures the natural variations in the gamma-rays detected near the Earth's surface as the result of the natural radioactive decay of potassium (K), uranium (U) and thorium (Th). The data collected are processed via standard methods to ensure the response recorded is that due only to the rocks in the ground. The results produce datasets that can be interpreted to reveal the geological structure of the sub-surface. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose. This radiometric uranium grid has a cell size of 0.00083 degrees (approximately 88m) and shows uranium element concentration of the Thomson Extension, Qld, 2011 in units of parts per million (or ppm). The data used to produce this grid was acquired in 2011 by the QLD Government, and consisted of 46530 line-kilometres of data at 400m line spacing and 80m terrain clearance.
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A radiometric survey was made, by carborne equipment, of the area of granitic country south-west of Edith Siding that was covered by the airborne scintillometer survey of 1952. Several small, lenticular deposits of radioactive, hematitic lode material were found in three shear zones, but the radioactive anomalies were in general due to hills of granite which have counts higher than the general background count. A similar carborne survey, and an investigation by a geochemical party, were made in an area of Brocks Creek sediments south-east of the Edith Siding, in which twelve third order anomalies had been indicated by the airborne survey. The anomalies were found to occur mainly along a slaty band, and along a prominently outcropping bed of tuffaceous sandstone. A shear or fracture zone near the southern end of the area investigated contains oxidized copper minerals, and Geiger counts a little higher than usual were obtained at one locality within it, and at another locality approximately 200 feet east of it. The largest of the hematitic lenses in the granitic country south-west of the Edith Siding will be inspected and sampled, and additional prospecting will be done along and adjacent to the copper bearing shear zone.
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The airborne scintillometer survey made in the latter half of 1952 revealed a number of anomalies in the Brodribb area. Detailed geological and geophysical work was carried out on this prospect during 1952 (Frankovich 1953) and some costeans were excavated by bulldozer. In 1953 diamond drilling and further geological and geophysical work was undertaken. During 1953, six diamond drill holes, with a total footage of 1583 feet, were drilled in the Brodribb area and were arranged to make an exhaustive test for the occurrence of a primary uranium deposit of importance in the area.
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The radiometric, or gamma-ray spectrometric method, measures the natural variations in the gamma-rays detected near the Earth's surface as the result of the natural radioactive decay of potassium (K), uranium (U) and thorium (Th). The data collected are processed via standard methods to ensure the response recorded is that due only to the rocks in the ground. The results produce datasets that can be interpreted to reveal the geological structure of the sub-surface. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose. This Thomson Extension, Qld, 2011 (P1249), radiometric line data, AWAGS levelled were acquired in 2011 by the QLD Government, and consisted of 46530 line-kilometres of data at 400m line spacing and 80m terrain clearance. To constrain long wavelengths in the data, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of the survey data. This survey data is essentially levelled to AWAGS.