Libero Copper & Gold Corporation (TSXV:LBC, OTCQB:LBCMF) has completed the interpretation of the detailed airborne magnetic and radiometric survey data, flown at the end of 2021, and the interpretation of all surface rock sample geochemical data on the project to date, resulting in the identification of nine new porphyry targets in the immediate area at the Mocoa porphyry copper deposit located in Putumayo, Colombia.
Highlights:
• Nine new high priority porphyry target areas identified
• Cluster of vertical intrusive bodies (porphyries) in the immediate Mocoa deposit area with a 6 km by 2.5 km demagnetized zone (hydrothermal alteration) with local strong potassium alteration
• Magnetic inversion data shows a series of vertical intrusive bodies (porphyries) in the Mocoa deposit area originating from the underlying eastward dipping pluton at depth
• New large high-sulfidation gold-silver target (2.5 km by 1.5 km), 3 km southeast of the Mocoa deposit
• Survey was flown over an 87 sq. km area surrounding the existing Mocoa porphyry deposit on granted mineral concessions. Libero Copper’s recently staked land position of more than 1,000 sq. km encompassing most of the Jurassic porphyry belt in southern Colombia will be systematically flown in the future
“In addition to the exceptional initial results from the maiden drill program, Libero Copper continues to make significant advancements towards demonstrating the potential to increase the endowment of mineralisation associated with the Mocoa deposit and the surrounding area,” President and CEO, Ian Harris, said.
“The apparent clustered porphyry system recently identified as a result of the airborne magnetic and radiometric survey that was flown at the end of 2021, has also identified new opportunities around and beyond the limits of the Mocoa deposit.
“The new targets identified will be systematically evaluated and receive the necessary follow-up work to be included in our ongoing field work and upcoming drill planning. This is another important advancement for Libero Copper and the Mocoa project and we look forward to continuing the evaluation and applying this systematic approach to the entire Mocoa land position.”
In late 2021, MPX Geophysics, completed magnetic, radiometric and LiDAR surveys over the Mocoa project area covering 87 sq. km. Daniel Core, PhD., of Fathom Geophysics, Westerville, Ohio, was contracted by Libero Copper to process and interpret the geophysical data. All available geotechnical data was provided to Fathom Geophysics to assist with the interpretation of the airborne survey data and Libero Copper processed the historic surface rock sample geochemical data to assist with the interpretation.
Processing and interpretation of the airborne geophysical data was performed by Fathom Geophysics and the main products produced include: geological interpretation with de-magnetized zone, structural interpretation, Analytic Signal magnetic (AS) map, K alteration index map, and magnetic inversion vector model with 3D radial symmetric isosurfaces (porphyry finger model).
The main outcomes and conclusion from the geophysical interpretation are as follows:
• Large 6.5 km x 2 km east-west oriented zone of demagnetisation is present and is generally centered on the Mocoa deposit. This is interpreted as possibly representing magnetic destruction associated with the hydrothermal system responsible for the Mocoa mineralising system.
• The magnetic inversion model with 3D radial symmetric iso-surfaces demonstrates the presence of numerous sub-vertical intrusive bodies originating from the underlying pluton which have been interpreted as possible porphyry bodies.
• A concentration of 3D radial symmetric iso-surface intrusions (porphyries) are present and clustered in an area immediately south-southwest of the Mocoa porphyry Cu-Mo deposit.
• The radiometric data shows an area of highly elevated K-alteration (K alteration index) coincident with the Mocoa deposit area which extends several km to the south and west.
• The 3D radial symmetric iso-surface intrusions (porphyries) extend to various levels relative to the current surface and in several areas (to the east) the entire porphyry system may be intact (including possible epithermal environment).
• Rock sample geochemical metallic element analysis has assisted in identifying nine targets associated with 3D radial symmetric iso-surface intrusions (porphyries) in the immediate area.
The targets identified are summarised as follows:
1) Located 1,000 m south of the center of the Mocoa deposit and associated with a 3D radial symmetric iso-surface intrusion (porphyry) with elevated surface Cu-Mo in rock sample geochemistry immediately south of Mocoa, with strong K-alteration.
2) Located 1,500 m southwest of the Mocoa deposit and immediately south of 2 – 3D radial symmetric iso-surface intrusions (porphyry) with elevated Cu-Mo-Zn-Pb in rock samples hosted by marble, with strong K-alteration. Skarn target with underlying porphyry source.
3) Located 2,500 m southwest of the Mocoa deposit, associated with a buried 3D radial symmetric iso-surface intrusion (porphyry) with highly elevated Cu-Mo+/-Zn in rock samples hosted by marble, with strong K-alteration. Skarn target with underlying porphyry – possibly similar to Mocoa.
4) Located 2,500 m south of the Mocoa deposit, associated with a 3D radial symmetric iso-surface intrusion (porphyry) with elevated Zn-Pb in rock samples hosted by marble/intrusion, with strong K-alteration. Skarn target.
5) Located 3,000 m southeast of the Mocoa deposit, associated with a 3D radial symmetric iso-surface intrusion (porphyry) with large 2,500 m x 1,500 m elevated Zn-Pb-Hg in rock samples, high sulfidation system. Possible intact porphyry system at depth.
6) Located 3,000 m east-northeast of the Mocoa deposit, associated with a 3D radial symmetric iso-surface intrusion (porphyry) with locally elevated Au-Ag in rock samples.
7) Located 3,000 m north-northwest of the Mocoa deposit, associated with a multiple 3D radial symmetric iso-surface intrusions (composite intrusion – porphyry) with locally elevated Mo-Au-Ag in rock samples.
8) Located 2,000 m northeast of the Mocoa deposit, associated with a 3D radial symmetric iso-surface intrusion (porphyry) with locally elevated Au-Sb in rock samples.
9) Located 2,000 m west of the Mocoa deposit, associated with a 3D radial symmetric iso-surface intrusion (porphyry) with locally elevated Cu-Mo-Zn-Pb-Bi in rock samples, with strong K alteration.
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