The Gascoyne Project comprises 100% owned tenements covering 537km2 located in the Gascoyne Region, Western Australia. It is located approximately 250km to the east of Carnarvon and 1,200km north from Perth.
The Project area is highly prospective for Broken Hill-style silver lead zinc ore bodies and quartz vein-hosted gold lodes. Secondary targets include manganese, tungsten, tin and tantalum.
The Gascoyne Project covers an area of mid-Proterozoic aged, metamorphosed sediments and volcanic rocks which have been subjected to several phases of tectonic deformation and intruded by granitoids. Exploration work and drilling to date has used the geological model of base metal mineralisation being associated with coincident soil geochem and “thumbprint” magnetic anomalies.
Historical RC drill testing from one of these targets has returned significant intercepts of 2.3% Pb and 0.9% Cu. Lead sulphide (galena) and copper sulphides (chalcopyrite) were identified in the drill chips.
Activities conducted by Audalia at the Gascoyne Project to date included completing:
- an IP survey programme
- regional and detailed geological mapping;
- 323 rock chip samples;
- 696 trap stream sediment samples;
- 44 stream sediment samples
- 257 soil geochemistry samples
- IP 100m dipole-dipole traverses on 6 N/s lines @ 300m;
- Aerial magnetic & radiometric survey @ 100m line spacing; and
- Airborne Electromagnetic (EM) survey @ 200m line spacings.
The results concluded that the Gascoyne Project has two sub-economic gold prospects, plus a number of gold and base metal geochemical anomalies that warranted further exploration. These include:
Rock chip gold anomalies:
CW697 25ppb Au 382,014E 7,284,681N 20m by 30cm ironstone
CW1028 61ppb Au 383,524E 7,271,435N 40m by 20cm weakly manganese/ iron-stained quartz vein
CW1039 82ppb Au 386,854E 7,272,789N 10m by 5m patch with 89ppm As sparse ironstone and quartz float
Rock chip base metal anomalies:
CW978 >1000Ba 376,324E 7,278,402N 10cm by 10m subcropping 469Cu manganese-rich(?) band.
CW989 867Cu 368,526E 7,284,387N Small patch of subcropping 2385Mn ironstone and vein quartz
CW1024 2589Mn 378,242E 7,283,903N 3m by 1m subcropping 1327Zn ironstone
CW1087 2.55Ag 363,331E 7,281,703N Gossanous(?) quartz vein 25As float near BIF
CW999 1022Pb 385,554E 7,274,359N 1m diameter subcropping ironstone
CW1004 1445Pb 378,372E 7,284,992N 100m by up to 1m ironstone
Values are in ppm unless otherwise indicated.
Manganese haloes of 2 to 5% are recorded in banded iron formations around the Broken Hill ore bodies. BIFs in Audalia’s tenements recorded up 6.84% manganese in rock chip CW1084; this sample consisted of 5cm thick magnetite BIF subcrop and float, located at 368,617E 7,290,083N. The next highest manganese value in BIF was 1.36%.
A map setting out the geology and geochemistry of the Gascoyne Project may be downloaded here