De Grey Mining Limited (ASX: DEG) has found two new mineralised intrusions at the world-class Hemi gold discovery, located approximately 60km south of Port Hedland in Western Australia.
The new discoveries, Diucon and Eagle, are located immediately west of the Crow intrusion along the SW-NE trending structural corridor running from the Scooby to Antwerp discoveries. Recent aircore and RC drilling has successfully defined two new zones of gold mineralisation over approximately +1km and +500m of strike respectively.
Managing Director Glenn Jardine said that importantly, the intrusions are not highlighted by any magnetic signature leaving large scope to define further non-magnetic intrusions throughout the region.
Systematic aircore drilling around Hemi has discovered two new mineralised intrusions: Diucon and Eagle,” Mr Jardine said.
“The initial follow up RC drilling has intersected broad zones of shallow gold mineralisation. Wide spaced drilling is at an early stage and both intrusions remain open along strike and at depth.
“Follow up RC drilling will continue with the aim to delineate the extent and continuity of gold mineralisation in both intrusions. Potential exists to define new resources to add to the existing gold endowment at Hemi.”
Aircore drilling to the west of Crow has defined the new Diucon prospect, a +1km long intrusion south of the north east trending mafic to ultramafic unit. This intrusion is considered a direct extension of the Crow intrusion and hosts encouraging variable alteration and gold mineralisation similar in style to Hemi mineralisation.
To the north of the ultramafic unit (strong magnetic high unit), the +500m long Eagle intrusion is interpreted to be an extension of the Antwerp intrusion complex.
Aircore drilling results have defined an area of anomalous gold +1000m long x 300m wide at Diucon and a +500m x 200m zone at Eagle. The shallow gold mineralisation is defined from 40m to 200m depth at Duicon, to 120m depth at Eagle. Both zones remain open at depth and along strike.
The early wide spaced aircore drilling results highlighted several +0.5g/t intervals and supporting anomalous arsenic geochemistry in the weathered bedrock. Geological logging also recognised encouraging zones of alteration and sulphide development similar to other Hemi deposits. The subsequent first pass RC drilling was planned to test these encouraging results at depth into the fresh bedrock.
Significant (>0.5g/t) aircore results included:
- 12m @ 1.1g/t Au from 56m in BXAC771
- 4m @ 0.9g/t Au from 74m in BXAC771
- 9m @ 1.0g/t Au from 39m in BXAC784
- 7m @ 0.5g/t Au from 56m in BXAC784
- 6m @ 2g/t Au from 45m in BWAC877 (incl 1m @ 8.4g/t Au from 49m)
- 12m @ 0.7g/t Au from 68m in BWAC880
- 8m @ 1.1g/t Au from 28m in BWAC881
- 4m @ 0.6g/t Au from 52m in BWAC917
Subsequent wide spaced follow-up RC drilling, on 160m to 320m spaced lines with 80m spaced holes, have been completed over the 1km strike length of Diucon and a single line at Eagle. The RC drilling shows transported cover sequence to approximately 40m depth with broad zones of encouraging variable alteration and sulphide development within the weathered to fresh intrusions.