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Enterprise Metals Re-Commences Drilling At Doolgunna

Enterprise Metals (ASX:ENT) has recommenced its infill and aircore drilling program at Doolgunna, 13 kilometres southwest of Sandfire Resources' (ASX:SFX) DeGrussa Copper-Gold Mine.

The 5,000 metres aircore drilling program will follow up anomalous gold and base metal targets defined at Scotty, Sulu, McCoy and Nimoy, which lie within the Narracoota Fm volcanics.


Enterprise has acquired data from the GSWA & CSIRO's 2012 Bryah Basin Spectrem2000 Airborne Electromagnetic Time Domain survey.

This recorded five "excellent" rated conductors along the Southern Boundary Fault, and a sixth excellent rated conductor located in the centre of the Doolgunna Graben.

These AEM anomalies represent very strong discrete bedrock conductors which are potentially massive sulphides.

Enterprise believes that the regional geological setting of the SBF and Doolgunna Graben is analogous with many of the major sediment-hosted copper provinces such as Mount Isa in Queensland, Zambia in Africa and the Kupferschiefer in eastern Europe.

These Sedex deposits occur within carbonaceous rich sediments such as shales, siltstones and dolomites deposited in intracontinental rift settings.

The copper mineralisation is thought to have been emplaced by saline rich reduced fluids with associated silica alteration into structurally prepared settings.

CSIRO Yerrida Basin SPECTREM2000 AEM Survey

Spectrem Air Ltd is a division of Anglo American, and its proprietary Spectrem2000 fixed wing Airborne Electromagnetic Time Domain system represents the state-of-the art in airborne geophysical exploration.

The system provides superior technological advantages in terms of the Electromagnetic design, power of the system and processing ability.

The aim of the Spectrem2000 system is to map and discriminate geological units and basement conductive bodies to depth of 500 metres in the presence of conductive cover.

It also provides superior shallow mapping capability in the first 100 metres due to its design and manufacturing.

In late 2012, the GSWA & CSIRO undertook a major survey of the Bryah Basin with the Spectrem2000 system.

The survey was flown at 2.5km line spacing in a north-south direction and anomalies generated were rated on a four part scale from 'excellent' to 'poor'.

Five bedrock conductors rated "excellent" were identified along the Southern Boundary Fault within Enterprise's landholdings, and a sixth conductor ("D") rated excellent was located in the centre of the Doolgunna Graben.

These AEM anomalies represent very strong discrete bedrock conductors with potential for massive sulphides.

Enterprise has commenced moving loop ground EM surveys over the "excellent" Spectrem2000 AEM targets to locate them more precisely on the ground.

As part of the regional aircore drilling program along the Southern Boundary Fault, aircore drill traverses will be undertaken over these AEM targets to test for regolith accumulations of copper.

Geological setting

The Doolgunna project tenements cover Palaeo-Proterozoic rocks of the Capricorn Orogen, which resulted from the oblique collision of the Pilbara and Yilgarn Cratons at about 1.8 Ga. These Palaeo-Proterozoic rocks are now recognized as the Bryah, Padbury and Yerrida Groups.

The Goodin Fault is a major reactivated reverse fault that separates mafic Narracoota Fm volcanics of the Bryah Group to the north from siliciclastic and mafic units of the Yerrida Group to the south.

The Goodin Fault is interpreted to be a major suture acting as a conduit for mineralising fluids during periods of extensional tectonics.

The Southern Boundary Fault (SBF) lies within the Yerrida Basin and separates the Doolgunna Fm sediments from the Johnson Cairn Fm which is draped around the Archaean Goodin Inlier.

The SBF is defined by a major but discontinuous magnetic feature which is believed to be associated with basin dewatering.

The geology of the Doolgunna Graben is poorly known due to lack of outcrop, substantial thicknesses of transported cover, deep weathering and little (effective) historical exploration.

Exploration of the Doolguna Graben for sediment hosted copper deposits has not been undertaken before by any company.

Enterprise believes that the geological setting of the Doolgunna Graben is broadly analogous with many major regional sediment-hosted copper provinces such as Nifty (Paterson Province), Mount Isa, Zambia and the Kupferschiefer in Eastern Europe.

Second aircore drill program

A second regional aircore drilling program of approximately 4,000m is planned to commence in early April.

This program will test the regolith above magnetic and Spectrem2000 AEM targets and selected copper-in-soil anomalies associated with the Southern Boundary Fault (SBF), which forms the southern margin of the Doolgunna Graben.

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