Systematic Approach Has Success In Fraser Range
Legend Mining Limited (ASX:LEG) has received further positive assay results and geological logging from RC drilling at the Mawson prospect within the Rockford project, Fraser Range Western Australia.
“It is exciting to see the RC drilling assays pointing to an extension of the Mawson mineralised system and another intrusion with the same geochemistry some 2km away,” Managing Director Mark Wilson said.
“These results have been generated by our unwavering systematic exploration approach.
“As a consequence, there will be several priority diamond and RC drill targets for the upcoming field season, with details to be released once thorough analysis is completed, later in February.”
Assays results for the remaining RC drilling (RKRC028 – RKRC041) completed during the 2020 field season have been received.
RKRC036 intersected a thickened package of metasediments and meta-BIF through to a depth of 316m downhole, the effective maximum depth penetration of the RC drill. The current geological model of Mawson suggests this metasedimentary cap thins considerably to the south and east, and this is validated with the limited drilling completed to date. The current model suggests potential for intrusive mafic/ultramafics below this metasedimentary cap, which will be one of the targets of drill testing in 2021.
RC drillhole RKRC037 intersected a highly prospective olivine gabbronorite and pyroxenite intrusive package to 296m downhole, finishing in meta-BIF interpreted to be a basal contact position. Disseminated Ni-Cu sulphide was encountered from 204m downhole (see Figure 1 and Figure 2), confirming the mineralised intrusive package continues south of existing drilling.
RKRC038 intersected an upper metasedimentary assemblage of meta-BIF and felsic granulites before intersecting the highly prospective olivine gabbronorite through to 289m downhole. Highly encouraging heavy disseminated to matrix Ni-Cu sulphide mineralisation was intersected between 267m and 275m downhole, interpreted to be the southern extension of the Mawson chonolith which hosts the main mineralisation at Mawson. Nickel values up to 1.43% and copper values up to 0.60% suggest the mineralised Mawson intrusive has been intersected and is open to the south, west, and down plunge (see Figure 1 and Figure 2).
DHTEM completed on RKRC037 and RKRC038 is subject to geophysical modelling and interpretation before diamond drill targets can be generated.
RKRC039 was drilled due south of the eastern aircore geochemical anomaly (see Figure 1). The drillhole intersected a dominantly olivine gabbronorite intrusive suite with intermittent pegmatite zones to 231m downhole, before finishing in a metasedimentary assemblage of meta-BIF felsic gneiss. A broad interval of disseminated Ni-Cu sulphide from 159m downhole, including a 5-metre zone of heavy disseminated and blebby sulphide from 224m downhole confirms that the Ni-Cu fertile intrusion extends south beyond the eastern aircore geochemical anomaly.
These are highly encouraging results given the similarities of the respective geological settings when compared to the massive sulphide mineralisation of the Mawson discovery. Drill planning for the 2021 field season will focus on these areas as a priority.
Mr Wilson said that importantly, the RC drilling continues to confirm the Mawson Intrusion extends south and east of the known Mawson Ni-Cu sulphide mineralisation, also confirming the prospectivity for mineralised intrusives in areas with no aircore geochemical anomaly. Additionally, the geological information continually evolves the Mawson geological model, enabling focused diamond drill targeting.