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Magnetic exploration of structurally controlled mineralization at low latitudes; a case from the Masara gold district, Mindanao, Philippines

P. C. Manalo, C. B. Dimalanta, B. R. B. Villaplaza, W. W. Brown and G. P. Yumul
Magnetic exploration of structurally controlled mineralization at low latitudes; a case from the Masara gold district, Mindanao, Philippines
Economic Geology and the Bulletin of the Society of Economic Geologists (November 2017) 112 (7): 1807-1817

Abstract

Magnetic data transformations are applied to the high-resolution magnetic data from the Masara gold district in the southern Philippines to enhance features related to a porphyry copper prospect and epithermal gold deposit. Using several filtering methods and structural mapping techniques, we were able to highlight the signal coming from a shallow chlorite-sericite alteration zone. Although the epithermal veins are mainly composed of nonmagnetic minerals, calculation of the tilt derivative of the magnetic grid revealed linear features that are coincident with the surface projection of the gold-bearing veins. Furthermore, dip directions of the magnetic sources were determined using Euler deconvolution, and they were found to coincide with the dip directions of the veins as determined by structural measurements at different underground levels. Aside from showing the utility of the magnetic methods in epithermal gold deposit exploration, this study also demonstrates that challenges of processing and interpreting magnetic anomalies in areas near the equator can be overcome. This research outlines a processing workflow that can be adopted for further investigation of other mineralized areas.


ISSN: 0361-0128
EISSN: 1554-0774
Coden: ECGLAL
Serial Title: Economic Geology and the Bulletin of the Society of Economic Geologists
Serial Volume: 112
Serial Issue: 7
Title: Magnetic exploration of structurally controlled mineralization at low latitudes; a case from the Masara gold district, Mindanao, Philippines
Affiliation: University of the Philippines, National Institute of Geological Sciences, Quezon City, Philippines
Pages: 1807-1817
Published: 201711
Text Language: English
Publisher: Economic Geology Publishing Company, Lancaster, PA, United States
References: 55
Accession Number: 2018-025709
Categories: Economic geology, geology of ore depositsSolid-earth geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch maps
N07°35'60" - N07°39'00", E126°01'30" - E126°04'30"
Secondary Affiliation: Apex Mining Company, PHL, Philippines
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 201814
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