McDouall Peak Station (part of the Central Gawler Project). Final report at licence expiry/full surrender, for the period 20/5/2004 to 19/5/2009.
Created: 12 Nov 2024 Revised: 12 Nov 2024

Exploration for diamonds undertaken by Flinders Mines Ltd (as part of the JV agreement made with Tasman Resources) on the subject EL, located about 70 km south of Coober Pedy, commenced with a re-assessment of open file airborne magnetic data in...

Exploration for diamonds undertaken by Flinders Mines Ltd (as part of the JV agreement made with Tasman Resources) on the subject EL, located about 70 km south of Coober Pedy, commenced with a re-assessment of open file airborne magnetic data in an attempt to identify subtle magnetic signatures associated with possible kimberlites. The data were reprocessed to remove noise and to enhance subtle magnetic features. The results were used to identify a number of key exploration areas where Jurassic kimberlites may have been extruded through the crystalline basement, and may still exist beneath the Jurassic Algebuckina Sandstone. In April 2008, one small 'postage stamp' helimag survey was flown over a prospective magnetic anomaly picked from the regional data, which was believed to have an affinity to a kimberlite pipe magnetic signature. The anomaly was ground checked, and one 10 litre loam heavy mineral sample was collected for diamond indicator mineral (DIM) identification. The purpose of the sampling was to try to detect DIM grains which could have been derived from a secondary (transported) source in the local area, or may have been brought to the surface by bioturbation. The EL 3339 loam sample was found to be negative for DIMs. One anomaly on EL 3339 was selected to be drilled. The drilling programme utilised a KD 150, aircore/RAB capable rig, and took place in March 2009. Two holes for 40 m were completed to test this magnetic target. Neither hole was able to reach basement, due to collapsing sands that created hole instability. Due to the low ranking of the target anomaly, no further drill attempt to reach basement was made. Drill cuttings samples of mature river sands taken from the depth interval 16-19 m in hole FGDH007 were examined for DIMs. The separated heavy mineral concentrate was mineralogically observed, and potentially interesting minerals were picked and sent for microprobe analysis, yielding a positive result for DIMs. Four highly weathered chromite grains and two moderately fresh picroilmenite grains were recovered. The microprobe geochemistry of these grains suggests that they are derived from kimberlite or kindred rock types. However, a proximal source for the grains is regarded as very unlikely.

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About this record

Record No mesac22361
Topic Geoscientific Information
Type of Resource Document
Category Type
Document Type Mineral Company Report - Mineral Exploration
Contributor Diatech Heavy Mineral Services
Sponsor Flinders Mines Ltd
Tenement EL 3339
Tenement Holder Tasman Resources NL;Flinders Mines Ltd
Operator Flinders Mines Ltd
Geological Province
Mine Name
Stratigraphy Algebuckina Sandstone
Commodity diamond
Notes
Geographic Locality: McDouall Peak Station;2008 Flinders Mines' Gawler Project Aerial Magnetic (helimag) Survey [part]
Doc No: Env 11966
Drillhole: FCGDH006;(258613);FCGDH007;(258614)
Drillhole Unit No: 5838 00951;5838 00952

Geographic Locality: McDouall Peak Station;2008 Flinders Mines' Gawler Project Aerial Magnetic (helimag) Survey [part] Doc No: Env 11966 Drillhole: FCGDH006;(258613);FCGDH007;(258614) Drillhole Unit No: 5838 00951;5838 00952

Language English
Metadata Standard ISO 19115-3

Citations

Use constraints License
License Creative Commons Attribution 4.0
Persistent identifier https://pid.sarig.sa.gov.au/document/mesac22361
Citation Cole, L.F. McDouall Peak Station (part of the Central Gawler Project). Final report at licence expiry/full surrender, for the period 20/5/2004 to 19/5/2009. Mineral Company Report - Mineral Exploration
https://pid.sarig.sa.gov.au/document/mesac22361

Technical information

Status
Maintenance and Update Frequency
Geographic Reference GDA2020 (EPSG:7844)
Geo bounding box {"type":"Polygon","coordinates":[[[134.5,-30],[135,-30],[135,-29.5],[134.5,-29.5],[134.5,-30]]]}
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