en.Wedoany.com Reported - Cobra Resources is advancing a fully funded six-hole diamond drilling program at the Manna Hill porphyry-skarn project in South Australia, expected to be completed in approximately 40 days. The molybdenum mineralization at the Blue Rose prospect is independent of the copper-gold skarn system and is associated with a separate syenogranite intrusive phase.
Management stated that the independent molybdenum grade exceeds 1% on a copper-equivalent basis and could potentially be processed as a separate batch rather than as part of a copper-molybdenum concentrate. Cost offsets, net smelter returns, or formal economic study data for the molybdenum component have not been disclosed in any published materials.
The current drilling program tests both a newly defined large porphyry target and the depth extensions of known skarn mineralization. This drilling campaign is Cobra Resources' (LSE: COBR) first diamond drilling test of the system, following interpretations from reverse circulation drilling, geophysics, and surface mapping. The project is described as South Australia's premier early-stage porphyry and skarn target, interpreted as an intrusion-related porphyry copper system. Data from each meter drilled will support future resource definition and extension target positioning.
The ongoing program includes up to six diamond drill holes totaling approximately 1,800 meters, operating on double shifts to reduce time. Access to the land is governed by a binding option structure, under which a subsidiary of Cobra Resources has the right to acquire 100% of Hamelin Gully, the entity holding the Manna Hill license. Exercising the option requires payment of A$1 million worth of Cobra Resources shares and reimbursement of audited project expenditures of £530,000. The seller retains a 26% equity interest in any future mining special purpose vehicle, subject to put and call options, meaning the project's ultimate ownership structure remains partially uncertain even as drilling progresses.
The geochemical signature at Manna Hill is divided into two distinct intrusive rock characteristics. Molybdenum mineralization is associated with syenogranite intrusions, while copper mineralization is linked to a diorite-type porphyry. The Blue Rose discovery has confirmed a broad zone of shallow, high-grade copper-gold skarn mineralization, including an intercept of 74 meters grading 1.02% copper and 0.25 g/t gold. In the same system, drilling also returned a separate 10-meter intercept at 144 meters depth grading 0.12% molybdenum, occurring outside the copper-gold skarn. At Netley Hill, a 350-meter interval shows 0.1% copper, 0.05% molybdenum, and 1 g/t silver, along with narrower intervals grading up to 0.3% copper and 0.02% molybdenum. Anabama includes historical intercepts: 27 meters grading 0.2% copper and 24 meters grading 0.06% molybdenum.
The current drilling program allocates six holes to two distinct hypotheses. Two holes target the Black Baccara target, a large porphyry interpretation defined by coincident induced polarization chargeability and resistivity anomalies. The remaining four holes test the depth extensions of Blue Rose skarn mineralization, specifically designed to assess whether a deeper porphyry source exists that feeds the shallow high-grade intervals already encountered.
Management noted that independent molybdenum has different economic characteristics from molybdenum in copper concentrates. On a copper-equivalent basis, independent molybdenum grades exceed 1%, a threshold that changes how the material is processed downstream. Since the molybdenum is not locked in a copper-molybdenum concentrate, it can be sold as a separate batch, avoiding some challenges associated with mixed copper-molybdenum concentrates.
The overall project has not yet disclosed a preliminary economic assessment, pre-feasibility study, or feasibility study, nor has any specific study been developed addressing the economics of molybdenum recovery. Manna Hill is located within a recognized cluster of copper systems in South Australia, geologically co-located with deposits such as Kalkaroo, Olympic Dam, Prominent Hill, Oak Dam West, Carrapateena, Hillside, and Kanmantoo, placing it within a province containing multiple established South Australian copper deposits.
Cobra Resources is testing the Manna Hill porphyry-skarn system through a fully funded six-hole diamond drilling program. The molybdenum mineralization at Blue Rose is independent of the copper-gold skarn system and is associated with a distinct syenogranite intrusive phase. Management has indicated that independent molybdenum grades exceed 1% on a copper-equivalent basis. The drilling program simultaneously tests two independent hypotheses: a newly defined large porphyry target and the depth extensions of known skarn mineralization. Independent molybdenum mineralization has been identified and economically characterized by management, but no study has assigned specific figures to it. Near-term drilling results will directly test geological hypotheses and gauge the scale of the accompanying molybdenum opportunity.
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