Cobar

MinEx Cooperative Research Centre (MinEx CRC) activities will be undertaken across the greater Cobar region. However, the MinEx CRC National Drilling Initiative will only focus on North and South Cobar.

Figure 1 and 2: Location maps of North and South Cobar Mineral Allocation Areas.

Current activities

Geological mapping

Geological mapping and sampling of rock outcrops in the South Cobar area was undertaken in October and November 2020. The data acquired is being analysed and synthesised and will become gradually available through MinView. Further geological mapping and sampling of rock outcrops and existing drill core is planned for the North and South Cobar areas in 2021 and 2022.

Community information sessions

The Department of Regional NSW's Geological Survey has prepared an online information session about the Cobar AMR survey. A recording of the webinar is available here:

Cobar MinEx CRC airborne magnetic and radiometric (AMR) survey from DPIE Training & Education on Vimeo.

You can also find out more about the AMR survey process here.

Completed activities

Hydrogeochemistry

Water sampling was conducted in May to September 2019 across the greater Cobar region. 86 samples were collected from existing waterbores then analysed for a range of elements and parameters such as salinity and pH. The age of some of the water samples was determined. Results were forwarded to landholders in May 2020 and are available on MinView. To download the data, click Tools > Data download > Hydrogeochemistry.

An accompanying interpretive report (by CSIRO and Geological Survey of NSW researchers) was released in March 2021.

Cobar Airborne Electromagnetic (AEM) Survey

GSNSW and Geoscience Australia coordinated an airborne electromagnetic (AEM) survey to measure the natural electrical properties of rocks and soil to a maximum of 400 m deep in the Cobar–Lake Cargelligo area. These properties vary depending on the type of rocks and soil, and the water content and salinity. The information collected will improve our knowledge of the geology and groundwater resources of the area, which will inform mineral explorers and farmers.

New Resolutions Geophysics (NRG) was contracted to undertake the survey. A helicopter flew at a height of 60 m, with the sensor suspended 30 m below, along 116 east–west lines. The lines were typically about 55 km long and between 2.5 km and 5 km apart. An interactive map of the survey lines is shown below.

The data has been processed and is publicly available. If you are interested in receiving a copy of the data please email us at minex.crc@planning.nsw.gov.au. The data is also available from MinView.

We would like to thank the local community for their support.

The Cobar MinEx CRC AEM survey area
Download kml file
Black lines are completed government flight lines.
Orange lines are completed industry infill lines.
Download kml file

Cobar Airborne Magnetic and Radiometric (AMR) Survey

Department of Regional NSW's Geological Survey with Geoscience Australia coordinated an AMR survey over the greater Cobar and Nyngan region.

AMR surveys measure small variations in Earth's magnetic field caused by different rock types and the naturally occurring radiation coming from the ground. AMR surveys use passive sensors, are non-invasive and do not disturb the ground.

The survey has filled gaps in our existing coverage, and the information collected will improve our knowledge of the rocks, faults, soils and mineral resources of the area.

GPX Surveys was contracted to undertake the survey. A plane flew 60 m above the ground along east‒west-oriented lines spaced 200 m apart. Some lines were flown north-south to 'tie' the data together. The plane flew higher over towns and buildings and tried to avoid groups of stock. Some areas were flown with a closer line spacing as industry-funded infill.

A map of the survey area is shown below.

The data is available for download from NSW Government's on-line application MinView. Industry infill data will be available publicly in the second half of 2022 through MinView.


AMR survey area in blue (Download kmz file)

Cobar Basin mineral systems model and HyLoggerTM data

Work by the GSSNSW has generated new data and interpretive products of mineral systems in the Cobar Basin:

Community information sessions

The Geological Survey of NSW held free drop-in sessions for landholders and the wider community in Cobar and Lake Cargelligo in April 2019.

An online webinar
Geoscience activities in the Cobar-Lake Cargelligo area: online information session
was held on 14 October 2020. A recording of the webinar is here.

Audit and Gaps reports

An audit and gaps study of existing geoscience data in the North and South Cobar areas are available on DIGS (GS2020/0184 and GS2020/0183) respectively