Legend Mining Limited (ASX:LEG)’s diamond drilling program at Rockford Project in Western Australia's Fraser Range continues to grow the flagship Mawson nickel-copper-cobalt prospect with the chonolith extended to the northeast and the ultramafic core expanded.
Geology, DHTEM and assay results from the latest diamond drill holes provide further evidence of extended nickel-copper mineralisation, particularly in the northeast.
The evolving understanding of the Mawson structural architecture has resulted in the potential identification of trap sites for massive nickel-copper sulphide accumulations in the northeast zone.
Ongoing drilling across Mawson will focus on continued definition of these mineralised intrusive bodies and targeting of structural trap sites for massive nickel-copper sulphide accumulation.
Increase in extent of MgO core
Managing director Mark Wilson said: “The mineralised intrusion has been extended to the northeast and importantly there has been a big increase in the extent of the high MgO ultramafic core.
“Recent drilling has also intersected encouraging nickel-copper mineralisation in RKDD071 and mineralisation proximal to EM conductors.
“This new data is continually updating the 3D model, which will be the predictive tool for identifying trap sites for massive nickel-copper sulphide accumulations.
“Our systematic program of diamond drilling followed by DHTEM to identify priority targets is ongoing at Mawson.”
Diamond drill hole locations, defined chonolith model and constrained gravity model projected to surface over aeromagnetics
LEG’s 3D model driving predictive exploration at Mawson continues to evolve with new data and continues to be very accurate as a predictive tool for targeting interpreted fertile intrusion.
The updated 3D constrained gravity model at this stage appears to have a high correlation for mineralised intrusion.
To date, the mineralised intrusive footprint at Mawson extends more than 1.4 kilometres in strike length, with the gravity model suggesting the intrusion extends more than 3 kilometres in strike length.
Drilling results
Assay results from holes RKDD055 and RKDD057-059 have been received with elevated nickel-copper values from several drill holes associated with disseminated sulphides in mafic and ultramafic intrusive.
One such example is RKDD071, which intersected nickel-copper mineralised mafic and ultramafic chonolith from 99.26 metres through to 207.18 metres.
Structural interpretation suggests the nickel-copper mineralisation encountered in RKDD071 is the continuation of the mineralisation intersected in RKDD044, 400 metres southwest.
DHTEM is now scheduled to search for offhole conductors related to the mineralisation encountered in-hole.
Results from RKDD060 confirm that the interpreted mineralised feeder to the Mawson intrusion continues at depth – Legend plans to test this target area further.
Next on the agenda
Aircore drilling contractor Drillpower Pty Ltd has mobilised to Mawson to begin an aircore program designed to test numerous interpreted mafic-ultramafic intrusions across the greater Mawson Intrusive Complex.
The program will occur across three priority areas, primarily testing for fertile nickel-copper intrusions with results to be reported once received.
Future programs include:
- Diamond drilling continuing systematically at Mawson across priority target areas;
- DHTEM to be undertaken on all completed diamond drill holes;
- Aircore drilling across interpreted mafic-ultramafic intrusions within the greater 16-kilometre x 6-kilometre Mawson Intrusive Complex; and
- Integration of diamond, RC, aircore geochemical and geophysical datasets to evolve 3D emplacement and test the latest model of Mawson.