공지 • Jan 29
Cobre Limited Announces the Successful Outcomes of the 2021 Field Exploration Programme on Perrinvale Volcanic Hosted Massive Sulphide Project
Cobre Limited announced the successful outcomes of the 2021 field exploration programme on the Company's wholly owned Perrinvale Volcanic Hosted Massive Sulphide (VHMS) Project (Perrinvale or Project) in Western Australia. The Company previously announced the commencement of an extensive programme of `boots on the ground' exploration at Perrinvale on 29 April 2021. The aim of the programme was to assess the broader exploration potential of the greater project area and identify prospects with the potential to add to the resources drilled at Schwabe. The field programme ran through to December 2021 generating 13,611 soil and 4,237 rock chip samples; all analysed via portable XRF (pXRF). 1,231 rock samples were also submitted for comprehensive multielement laboratory analysis. The new sample data was combined with existing datasets including the 2019 Airborne Electromagnetic (AEM) survey conductors, magnetic and radiometric imagery, HyMap hyperspectral imagery, available geological mapping, plus historic soil, rock chip and drill data, to identify prospective areas. A total of 29 new areas of interest (AOI) were delineated. These were visited in the field for a more comprehensive reconnaissance and sampling exercise aimed at better understanding local geology and geomorphology, identifying signs of alteration that may be indicative of VHMS mineralisation, and increasing local sample density. This work also incorporated revisiting some of the previously defined prospects on the Panhandle Greenstone Belt. A ground Moving Loop Electromagnetic (MLEM) survey was undertaken in December 2021, taking advantage of contractor availability. Three new prospects (Midway, Freshwater, and Feys Copper) were surveyed, with a fourth (Ankle Breaker) partially surveyed in the time available. Conductors were identified in all survey areas. In January 2022, the Company conducted a technical workshop to review and then, where justified, recommend the next steps for exploration. Recommended exploration includes immediate drill testing, further ground MLEM, submission of selected collected soil samples for laboratory assay and further boots on the ground work. The process culminated in the five members of Cobre's technical team ranking all areas and independently selecting their top ten prospects. One of the original prospects that is now showing greater potential is Costa del Islas. Following the drilling of a single RC hole (20PVRC007) in 2020, the area was subject to detailed soil sampling and ground reconnaissance resulting in definition of a significant area of soil anomalism, along with areas of malachite mineralisation. The 2020 RC hole, reported in ASX announcement dated 20 August 2020, was drilled as a first test targeting an area where three MLEM conductor models overlap. A review of the drill chips indicates the presence of andesite within the package of basalt, mudstone and narrow black shales originally reported. Three zones of elevated sulphides correspond with the MLEM models. The sulphides, primarily pyrite and pyrrhotite, included signs of base metals with one interval returning: Sulphide zone: 3m@ 0.04% Cu, 0.08% Zn, 86 ppm Co, 32 ppm Pb, 0.01 g/t Au, & 0.7 g/t Ag from 91m (including: 1m@ 0.06% Cu, 0.14% Zn, 117 ppm Co, 40 ppm Pb, 0.003 g/t Au, & 0.8 g/t Ag from 92m). The soil sampling and detail ground reconnaissance had not been completed at the time of drilling. This detailed work, now completed, suggests the hole was drilled to the south and east of the higher Cu in an area of stronger Zn in soils. Sites of visible copper mineralisation (field description = malachite along with pXRF Cu response) in rock samples, with a concentration of occurances located 600-700m NE of drill hole 20PVRC007. Here copper is hosted in a broad area of gossanous chert, which is hosted within a package of mafic to ultramafic schist along with a narrow black shale. Two conductors identified in the AEM line by line review appear to be associated with this area of surface malachite. Located beyond the limits of the 2020 MLEM survey, expansion of the MLEM dataset to the north has been recommended to cover the gossanous area prior to defining further drilling at Costa del Islas. The Company is now finalising budgets for board approval to allow the next exciting phase of field exploration to commence at Perrinvale.