Mamba Exploration Limited (ASX:M24) has intersected two zones of sulphide mineralization in drilling at the southern prospect at Black Hills in Western Australia.
Visual logging has been completed on the second and third holes (23BHD002 and 003) and has identified semi massive sulphide mineralization within a broader zone of disseminated sulphide mineralization in hole two, and multiple zones of heavily disseminated sulphide mineralization including narrow zones of massive sulphides in hole three.
In hole 23BHD002, the sulphides have been intersected at the approximate depth of the modelled EM conductor at the BH1-West target within a highly altered and foliated mafic unit. In hole 23BHD003, the sulphides have been intersected near the modelled EM conductor at the BH1-north target within a zone of mafic and quartz feldspar gneiss.
The diamond core for the sulphide mineralization in the second and third holes has been processed and sampled with the samples submitted to ALS Ltd. in Perth for analysis.
“The second and third holes drilled to target surface EM conductors have both intersected zones of sulphide mineralization dominated by pyrrhotite and pyrite,” Managing Director, Mike Dunbar, said.
“The second hole has also intersected a zone of semi-massive sulphide mineralization within a broader zone of disseminated sulphides in a highly altered and foliated mafic unit. The third hole intersected four broad zones of heavily disseminated zones of sulphide mineralization including narrow zones of massive sulphides within a highly foliated and altered gneiss.
“The massive and semi massive sulphides correspond well with the position of the modelled strong fixed loop EM conductors at each of the targets.
“Downhole surveys have been completed on all three holes, with initial analysis confirming that the massive, semi massive and net textured sulphides intersected in the holes are the conductors being targeted. Full modelling of the downhole EM data is ongoing.
“The results for the first hole have confirmed that the main sulphides are pyrrhotite and pyrite, with only very low level anomalism identified from the initial sampling. Sampling of the second and third holes has been completed with the samples submitted to ALS for analysis.
“With this programme completed, our attention now turns to the Hyden REE project where modelling of the recent gravity survey data is nearing completion and the results of the shallow Air Core drilling are expected in the next few weeks.”
Mr Dunbar said that given the correlation between the sulphide mineralization and the modelled position of the fixed loop surface EM conductors, it is clear the sulphide zones identified are the EM conductors being targeted.
Downhole EM has been completed on each of the holes, and initial analysis of the downhole EM data has confirmed very strong “in-hole” conductors which correspond with the logged sulphide intersections. Detailed modelling is ongoing on the downhole EM data from each hole to assist in determining the orientation of the conductors and to determine if any other off hole conductors can be identified.”
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