Augustus Minerals Restricted (the Firm) refers back to the announcement dated 7 June 2024 titled “Minnie Springs Excessive Grade Cu-Mo Porphyry Focusing on” (Announcement).
The Firm needs to replace the Announcement including info in respect to Determine 1. Enclosed with this cowl web page is the up to date announcement.
Authorised by the Board of Augustus Minerals Restricted.
Augustus Minerals (ASX: AUG; “Augustus” or the “Firm”) is happy to supply an replace on geological modelling of mineralisation and alteration mapping following current RC drilling and reprocessing of historic IP survey knowledge for the Minnie Springs Copper (Cu)-Molybdenum (Mo) challenge within the Gascoyne Area.
- Augustus Minerals has performed re-processing of historic Induced Polarisation (IP) geophysics on the Minnie Springs Cu-Mo porphyry challenge which highlights the potential for close to floor extensions to present Mo mineralisation.
- Potential recognized for greater grade Cu and Mo zones at depth beneath “tilted” porphyry mannequin.
- Cu mineralised quartz veins drilled by Augustus within the 2024 RC program over the jap a part of the prospect could also be “smoke” remobilized from greater grade zones at depth by shearing associated to the regional Minga Bar fault system.
- Earlier drilling at Minnie Springs intersected mineralisation, geology and alteration halo in keeping with the zoning of a big porphyry copper / molybdenum system.
- Two holes with EIS funding deliberate to check for the higher-grade zones at depth.
Andrew Ford, GM Exploration
“Modelling of the Minnie Springs system in an built-in method by incorporating current drilling, alteration mapping and geophysics has highlighted each potential extensions to present close to floor Mo wealthy zones, in addition to the potential for greater grade Cu-Mo zones at depth”.
Minnie Springs
Minnie Springs hosts porphyry associated Cu-Mo mineralisation that was beforehand drilled by Equatorial Mining and Catalyst Metals. A molybdenum Exploration Goal has beforehand been outlined by SRK Consulting for the historic drilling space comprised of between 12 – 84Mt as outlined beneath (Desk 1 and Determine 2)1. Clarifying Assertion: The potential amount and grade of the exploration goal is conceptual in nature, there was inadequate exploration to estimate a Mineral Assets, and it’s unsure if additional exploration will outcome within the estimation of a Mineral Useful resource.
Desk 1. Exploration goal measurement estimate for Minnie Springs Molybdenum depositBe aware: Based mostly on ~300 ppm Mo cut-off at 100% restoration.
The just lately accomplished 3,070m RC drilling program that infilled round gap MSRC012 drilled final 12 months (18m @ 0.37% Cu and 9.7 g/t Ag from 94m downhole, and 16m @ 0.38% Cu and 19.4g/t Ag from 121m downhole2) and examined the northern half of the 2km lengthy copper-in soil anomaly continued to increase the footprint of Cu anomalism. Assays from this program >0.1% Cu are Listed in Desk 2 beneath; collar particulars are listed in Desk 3.
The RC drilling has confirmed robust Cu anomalism inside quartz veins over a strike size of higher than 3km beneath the robust Cu-in-soils anomaly (Determine 2). The affiliation of the copper with the quartz veins with reasonable to low ranges of pyrite (no chargeability IP response) counsel structural remobilisation from a deeper copper supply. Shearing throughout the Cu zone will increase considerably because it approaches the key northwest trending Minga Bar Fault system; that is supported by a marked enhance in water intersected throughout the RC drilling throughout the easternmost holes.
As mentioned above, the Mo wealthy core of the system is situated southwest of the Cu anomaly which suggests that the system is tilted to the east, exposing the Mo wealthy zone which is often seen deeper throughout the porphyry than the Cu zone.
Geophysics
Southern Geoscience Consultants (SGC) reprocessed the 2 IP Surveys performed by Equatorial Minerals in 1997. A gradient array survey was performed over each the Mo and Cu zones, highlighting elevated chargeability over the Mo wealthy zone, with no vital chargeability over the Cu-in-soil anomaly to the east. The chargeability anomaly over the Mo mineralisation seems to be reflecting a mix of disseminated pyrite and molybdenite noticed within the historic drilling (Determine 3).
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