Legend Mining Limited (ASX:LEG) continues to build upon the Mawson discovery of its Rockford Project in WA’s Fraser Range with 12.95 metres of massive nickel-copper sulphides intersected in a diamond drill hole.
This massive sulphide was within a mineralised zone of more than 90 metres which also included 7.55 metres of semi-massive sulphide.
There were multiple zones of net-textured, matrix and heavy disseminated sulphide.
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Legend managing director Mark Wilson said: “The discovery of another 12.95 metres of massive nickel-copper sulphide in diamond drill hole 23, around 200 metres from the previously announced massive sulphides, is a quantum boost for the potential of the Mawson prospect.
“The nature of the mineralisation suggests we are closer to the intrusive source, but we are not there yet.”
Observations are from diamond drill hole RKDD023, which was designed to test the very strong 25,000-30,000S conductor at Mawson.
Within wide zone
This hole intersected a wide zone of nickel-copper mineralisation over 90 metres in width downhole from 216.45 metres in an interleaved intrusive and metasedimentary assemblage, before finishing in metasedimentary package.
The host intrusive is a mixture of olivine gabbronorite and gabbronorite, with massive, semi-massive, net textured, matrix, heavy disseminated, disseminated and blebby nickel-copper sulphides throughout.
Massive nickel-copper sulphide accumulations from 221.9-223.75 metres, 228.7-236.9 metres and 237.8-240.7 metres downhole occur within the interleaved metasedimentary units, with distinctive brecciated margins, indicating sulphide mobilisation.
This textural observation, combined with the evidence of limited sulphide extension veining, suggest the mineralised zone intersected is remobilised and proximal to the intrusive source.
DHTEM is underway in RKDD023 to provide additional vectoring of the significant mineralisation across the mineralised zone and structural logging will be undertaken before being sampled and submitted for assay.
Wilson said: “Downhole EM from this hole is designed to provide data to assist in planning future diamond holes in this immediate vicinity.”
A further 10 reverse circulation (RC) holes (RKRC018-027) have been completed and assays received for six holes (RKRC015–020.
RC holes RKRC015 through RKRC020 intersected a highly prospective package of mafic and ultramafic intrusives above a metasedimentary and mafic granulite package.
High MgO ultramafic, gabbronorite and olivine gabbronorite intrusives contained variable mineralisation, dominantly trace to disseminated, with minor net-textured sulphide.
Wilson added: “Importantly, the RC drilling confirms the Mawson intrusive complex extends north and east of the known Mawson nickel-copper sulphide mineralisation, confirming the prospectivity for mineralised intrusives below the eastern aircore geochemical anomaly.
“The RC holes are also a great platform for downhole EM.”