Estrella Resources Limited (ASX: ESR) has intersected a broad ~24m wide zone containing a cumulative 17.5m wide Ni-Cu sulphide intersection below the T5 nickel discovery in the 946m deep downhole electromagnetic (DHEM) platform hole CBDD067 at the Carr Boyd Project in WA.
The intersection occurred between ~782m-806m on the T5 Basal Contact, 80m south and 150m below the massive sulphide discovered in CBDD042A1 which until now has been the deepest intersection informing the known T5 mineralisation.
The drillhole was designed to intersect the basal contact underneath a set of flat faults that have been inferred from geological studies on previous drilling.
DHEM will be used down this hole to explore a large vertical section of the basal contact for additional massive sulphides often seen associated with the silicasulphide plume material identified in CBDD067. This method of establishing deep DHEM platform holes was used successfully by Estrella in 2020 to discover the T5 mineralisation along the basal contact of the Carr Boyd Intrusion.
Making further sulphide discoveries at depth is very encouraging as this is the deepest intersection of T5 mineralisation drilled to date by Estrella, further highlighting the continuing expansion of T5 mineralisation,” Managing Director Chris Daws said.
“Through methodical drill testing, we are gaining a better understanding of the geological setting at T5. CBDD067 will allow our teams to undertake a DHTEM survey to further test the surrounds for possible massive sulphide accumulations.
“There is still a very large area of highly prospective basal contact at the Carr Boyd intrusion yet to be fully tested and we look forward to the second new diamond rig arriving on site to expedite the exploration activities.”
Regional Exploration
The Phase 5 regional programme continues with the diamond drill rig moving back to Mossgiel to continue a series of DHEM platform holes, the latest of which is CBDD068 (Figure 2). Phase 5 involves drilling a series of holes where previous RC and diamond drilling has located nickel sulphides in pyroxenites on the basal contact.
Some 12km of fertile basal contact has been mapped to date, comprising three main prospects; Mossgiel, T5-Broonhill and Gossan Hill. Scout drilling at all three prospects had proven that the rocks in these positions are fertile, containing nickel-copper sulphides.
Phase 5 is aimed at systematically covering a cross-section of the contact with diamond drilling and DHEM so as to locate additional massive sulphides. To assist in timely exploration, a second diamond drill rig is expected on site shortly to assist in completing a series of exploration holes between T5 and Broonhill.