Cosmo Metals Ltd (ASX: CMO) has intersected significant VMS-related Cu-Zn-Pb-Ag mineralization with reverse circulation (RC) drilling at the Minjina Base Metals Prospect, within the Yamarna Project located ~150km east of Laverton in the Eastern Goldfields of Western Australia.
The Minjina drilling programme was designed to target volcanogenic massive sulphide (VMS)-style zinc-lead- copper-silver (Zn–Pb-Cu-Ag) mineralization ~one km north of the Company’s Mt Venn deposit.
VMS Zn-Pb-Ag mineralization at Minjina was discovered by the company in late 2022 with RC hole MIRC003 drilled to follow up an historical base metals intersection. MIRC003 included: 7.0m @3.20% Zn, 0.82% Pb, 11.84g/t Ag from 73m, including 2.0m @5.0% Zn, 1.4% Pb, 18.83g/t Ag from 76m
“These are exciting results as we build our belief that Minjina could be the beginning of a meaningful polymetallic mineral discovery,” Managing Director, James Merrillees, said.
“Although we haven’t hit the high-grade base metals zone we are targeting, the wider Pb-Zn intersections now with Cu and higher-grade silver associated with massive sulphides in MIRC013 is an unexpected, but important result, supporting our interpretation that this is the tip of a larger, potentially higher-grade Zn-Pb-Ag-Cu VMS system.
“The identification of a strong conductor from DHEM modelling in MIRC012, which stopped short of the massive sulphide zone intersected in MIRC013, is another exciting development with the MJ1 target, 150m south of the high-grade silver hits in MIRC013 opening a significant area for drill testing.”
Next Steps
Further studies including structural/3D geological modelling, petrographic examination and isotope studies are ongoing to improve the company’ s understanding of the Minjina deposit and provide vectors to potentially economic zones within the system.
Given the widespread post-mineral cover the company’s studies has included reprocessing and re- interpretation of detailed geophysics data sets including magnetics and gravity data sets which have highlighted two important structural trends not previously recognized that are interpreted to control mineralization at Minjina. These two zones could be tested with a detailed grid of shallow Air Core drilling to define targets for deeper drilling.
Work programmes planned over the coming months are expected to include:
- Auger sampling to map out anomalies in the regolith
- Grid fences of shallow RC or Air Core drilling of structural targets outlined above
- RC (and potentially diamond) drilling direct drill targets such as MJ1 and mineralization down dip of the existing drill fences following vectors to higher grade and copper-rich parts of the Minjina mineralized system.
For further information please visit: https://cosmometals.com.au/