お知らせ • Dec 20
Cosmo Metals Limited Announces the First Phase of RC Drilling Complete At the Minjina Prospect
Cosmo Metals Ltd. announced that the first phase of RC drilling has been completed at the Minjina Prospect, approximately 900m north of Cosmo's Mt Venn copper-nickel-cobalt deposit within the Yamarna project, which is located 150km east of Laverton in the Eastern Goldfields of Western Australia. The nine-hole (1,627m) program successfully intersected broad zones of massive to semi massive sulphides with copper (Cu) and nickel (Ni)-cobalt (Co) mineralisation analogous to Mt Venn, in holes MIRC004 and MIRC008. Hole MIRC003 intersected a broad (49m) wide zone of elevated Zn mineralisation from 41m downhole confirmed by portable X-ray fluorescence (pXRF) analysis. Visual logging of MIRC003 by the company's geologists did not identify sulphides in this zone except for a rare-trace red mineral interpreted to be sphalerite due to the elevated pXRF readings. MIRC003 was designed to follow up the original historical intersection hole 17MVRC004 which included: 12m at 0.8% Zn, 3.3g/t Ag & 0.16% Pb from 48m, including 2m at 2.13% Zn, 3.56g/t Ag & 0.39% Pb from 58m. The company's November-December RC drill program comprised nine holes totaling 1,627m, however one hole (MIRC006) was abandoned short of the target depth due to difficult ground conditions and MIRC007, collared 10m west of MIRC006, was abandoned at 19m when the hole collapsed. Overall, the program focussed on two target areas: 1. Mt Venn style Cu-Ni-Co (massive sulphide associated) mineralisation defined by two strong electromagnetic conductors identified by the company's October 2022 ground geophysical program; 2. Zinc (Zn) - Lead (Pb) mineralisation discovered in historical hole 17MVRC004 which intersected: 12m at 0.8% Zn, 3.3g/t Ag & 0.16% Pb from 48m, including 2m at 2.13% Zn, 3.56g/t Ag & 0.39% Pb from 58m. The company now awaits laboratory assays with results from >500 samples expected to be received in early January. 1. Mt Venn style Cu-Ni-Co targets: The company's systematic program of moving loop and downhole electromagnetic (MLEM & DHEM) surveying completed in several campaigns between August and November identified two strong, discrete, late-time EM conductors at the Minjina Prospect, 900m north of Mt Venn, and which were the initial focus of drilling in the recently completed RC program. The first two holes of the program targeting these strong conductor `plates' (MIRC001 & MIRC002) were drilled to the target depths but failed to intersect geology or mineralisation that could explain the conductors, with MIRC002 intersecting an 11m-wide zone of elevated Zn (pXRF analysis) from 72m within a broad, 76m-wide zone of pyrrhotite-dominant sulphide mineralisation from 7m down hole. the company's geophysicists interpreted the lack of conductors at the target depths in MIRC001 and 002 to reflect the complexity of the mineralisation and interference caused by a deeper, strong conductive source which may represent a new target for future testing. The company was able to mobilise a DHEM crew to probe MIRC001 and 002 while the rig remained on site with survey data confirming the presence of strong off-hole conductors in each hole: a) Two off-hole conductors were modelled from the DHEM in MIRC001. A strong conductor 70m to the south was tested by MIRC004, and another anomaly 120m east of MIRC001 was tested by hole MIRC008. MIRC004 intersected a 55m-wide zone of highly magnetic, `Mt Venn style' Cu mineralisation from 8-63m down hole with numerous individual pXRF analyses of over 1% Cu. MIRC008 intersected a 17m-wide zone of `Mt Venn style' massive and disseminated sulphide (pyrrhotite>>chalcopyrite) mineralisation from 172m downhole. pXRF analysis confirmed this zone is associated with copper, nickel, and cobalt mineralisation. Mineralisation in both holes MIRC004 and MIRC008 is open and further drilling of the 300-400m long aeromagnetic anomaly is recommended to try and define the copper mineralisation at least over that extent. MIRC008 was cased for DHEM and a survey crew will be on site in late January to identify further extents of the massive sulphides intersected in this hole. b) A strong (>7,000 Siemens) off-hole conductor modelled 150m south of MIRC002 was tested by hole MIRC009, with two earlier holes, MIRC006 and MIRC007, abandoned short of the target depth. MIRC009 failed to intersect conductive stratigraphy at the modelled depth, with the target remaining unexplained. MIRC009 was unable to be cased for DHEM and planned follow up at this target will include a focussed ground EM survey (Fixed Loop EM) after review of the laboratory analyses. 2. Zinc (Zn)- Lead (Pb) Mineralisation (as intersected in 17MVRC004): Zinc mineralisation intersected in historical hole 17MVRC004 was followed up by a `step out' hole, MIRC003, drilled 80m to the east of the older hole. MIRC003 intersected a broad (49m-wide) zone of elevated Zn mineralisation identified by the pXRF from 41-90m down hole, with associated carbonate alteration. No sulphides were initially logged in MIRC003 although a red mineral identified in this interval is interpreted to be a red sphalerite (Zn-sulphide). The company interprets a shallow sub-horizontal easterly dip of the mineralisation between 17MVRC004 and MIRC003 with mineralisation open and potentially increasing in grade and widths to the east although this is to be confirmed by laboratory analyses. Given the lack of pyrrhotite in the Pb-Zn system (and any conductors identified in the company's ground EM surveys to date) potential follow up to target the extents and controls of the system before further drilling may include ground gravity (to map out denser, mineralised zones) and detailed magnetics (to better map geology and structure).