(Global Geoscience 100%)
Global has discovered porphyry-style copper-gold-silver mineralisation at the Quillcata prospect at Mancha Pampa in Peru and the company believes it has the potential to contain a large tonnage of copper-gold-silver mineralisation. There is no evidence of previous exploration at the Quillcata prospect.
The Mancha Pampa project is located 150km southeast of Lima in the Yauyos Province of central Peru. Geologically, the project is located within the Andean porphyry belt, the largest copper producing province in the world, and about 100km southeast of Peru Copper Inc’s Toromocho Project (Proved and Probable Reserves of 1.3 billion tonnes at 0.51%Cu, 0.018%Mo, 7g/tAg) which is also based on porphyry mineralisation.
Global holds granted tenements over an area of 14 sq km with applications covering an additional 121 sq km. Global holds 100% interest in all tenements. Part of the project area, including the Quillcata prospect, is subject to a 2.5% net smelter return royalty.
During the year Global completed several phases of field work at Mancha Pampa comprising geological mapping, trenching and surface geochemical sampling (rock chip, soil and stream sediment). A highly altered and mineralised porphyry intrusive rock with associated anomalous levels of copper, gold, silver and molybdenum has been indentified.
The copper zone of approximately 600m by 450m coincides with the eastern zone of porphyry and alteration. Soil samples are generally over 120ppm copper (Cu) in this zone and range up to 5,150ppm. The 150m wide, north-eastern third of the copper zone is generally more anomalous, with soil samples generally exceeding 1,000ppm Cu. Numerous rock chip samples have been collected within the copper zone, with copper contents averaging about 500ppm Cu. One grab sample contained 2.6% Cu.
The area of the copper zone also contains anomalous molybdenum (Mo) in soils with values over 3ppm and up to 170ppm Mo. Rock chip samples within this zone average 3 to 4ppm with values up to 157ppm Mo.
The 600m long and 50 to 100m wide gold zone occurs within the broader copper anomaly, along the western boundary of the zone of highest copper soil samples. Soil samples contain between 0.1 and 2.3g/t gold (Au). As sections of this soil anomaly are covered with thick scree, rock chip samples have only been taken at sporadic locations. However, where the gold zone has been rock sampled, values are variable. Average values are about 0.1 to 0.2g/t Au with the highest value being 4.0g/t Au (over a 5m width).
The silver zone overlaps the eastern boundary of the copper zone and is up to 200m wide. Soil samples generally contain greater than 5g/t silver (Ag). Rock chip samples within this zone commonly exceed 2g/t Ag. One rock sample contained 26g/t Ag over a 20m width.
The porphyry intrusive, alteration and copper anomaly at Quillcata are comparable in size and magnitude to a number of other Andean porphyry copper deposits. The potential therefore exists for significant mineralisation at the Quillcata prospect.
A multi drill hole program is required to test for supergene and underlying primary copper mineralisation at Quillcata. Work is well underway to obtain the necessary environmental and regulatory approvals for drill testing Quillcata and a work agreement has been signed with the local Aquicha community.
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