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Tapian San Francisco: Porphyry Mineralization Drill-Intersected
Geology of the Tapian San Francisco (TSF) Project consists of ultra-mafics, volcanics and limestones intruded by diorite and monzonite dykes and intrusions. Several major northeast-trending lineaments extend from TSF through the Boyongan district hosting the Boyongan and Bayugo copper-gold porphyry deposits. The northern portion of the TSF property overlaps the southern edge of a large intrusive complex of approximately six kilometers in diameter that hosts the Masgad porphyry system on its western margin and the Mayag porphyry system on its eastern margin.
A cluster of seven IP chargeability anomalies was defined at TSF. Geological work has focused on two northeast structural/chargeability trends: the C4/C6 trend and the C5/C9 trend. The two trends are coincident with porphyry-related rock alteration and copper, gold and zinc in-soil geochemical anomalies and extremely abundant gold and copper showings.
Alteration at TSF is widespread, pervasive, and typical of porphyry systems. This includes widespread propylitic and argillic alteration, minor calc-silicate alteration, structurally-controlled phyllic alteration and occurrences of potassic alteration. These alteration assemblages span an area that exceeds 3.5 kilometers by two kilometers, typical of large magmatic hydrothermal copper-gold ore-forming systems.
A group of seven IP chargeability anomalies was defined at TSF. Geological work has identified a cluster of porphyry copper-gold targets, as well as multiple epithermal gold prospects, which can be seen on the Surigao Gold District map. Further work has focused on two northeast structural/chargeability trends: the C6 trend and the C9 trend. The two trends are coincident with porphyry-related rock alteration and copper, gold and zinc in-soil geochemical anomalies and extremely abundant gold and copper showings.
During 2006, a reconnaissance drilling program was carried out at C6 and C9 and three drill holes for a total of 1,176 meters were completed. The drilling intersected a series of narrow monzonite, monzonite porphyry, diorite porphyry, porphyritic dacite, and porphyritic andesite intrusive sills/dikes. They dip gently to moderately eastwards and intrude a thick sequence of volcanic, sedimentary and ultramafic rocks. The intrusives are affected by porphyry-related alteration (propylitic, phyllic, remnant potassic and associated skarn-type alteration). Multiple narrow zones of copper and gold mineralization were intersected (for example, 1.9 meters of 0.21% copper and 0.14 g/t gold).
The mineralization and alteration is typical of mineralization in the distal to intermediate parts of a porphyry copper-gold system and suggest that the core of the porphyry system is further to the east within the project. Additional drilling is proposed to vector into the center of the system at a later date.
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