ABSTRACT Veins intersected by a ~600‐m‐long drill core into the Hokuryu epithermal Au‐Ag deposit in northeastern part of Hokkaido, Japan, were investigated including mineralogy, texture, quartz composition, and fluid inclusion characteristics, with relation to elevation. Host rocks these veins are flow‐banded rhyolite, pyroclastic breccia, andesite mainly altered illite chlorite. The display crustiform massive macroscopic textures. generally located at higher elevations, contain Ag‐rich...

Sedimentary geochemistry, particularly whole-rock, trace element, and rare earth element analyses, has proven to be an effective tool for provenance studies, especially in geologically complex regions such as the Philippines. These techniques enhance delineation of tectonic boundaries provide critical insights into a region's petrogenesis evolution.In Northern Luzon, Philippines, much geological framework Central Cordillera Range been established through field investigations mineral...

Geometallurgy has emerged as a critical approach for understanding unconventional ore deposits, leveraging advanced techniques such automated mineralogy and diagnostic leaching to characterize the behavior of complex ores. In Philippines, Carmen quartz-pyrite-gold (QPG) veins in Mankayan Mineral District exemplify deposit, where copper occurs arsenic-bearing tennantite enargite. The ore's complexity is emphasized by intricate mineral textural relationships its deleterious nature....

Abstract The Northwest quartz-pyrite-gold veins are situated 500 m east of the Lepanto fault in Mankayan, Luzon, Philippines. Most vein mineralization is hosted by metavolcanic basement rocks at an elevation between 700 and 1,050 m. earliest stage, stage 1, characterized sphalerite + chalcopyrite pyrite ± magnetite cutting host that were altered to chlorite illite epidote. Precious metal deposition started 2 as electrum, native gold, gold-silver tellurides deposited with pyrite, quartz,...

This paper presents the first field, geochemical and geophysical information on recently recognized Early Cretaceous Balud Ophiolitic Complex (BOC) in island of Masbate Central Philippines. Mapping western limb revealed that only upper crustal section BOC is exposed this area. Geochemically, pillow basalts are characterized by transitional mid-oceanic ridge basalt-island arc tholeiitic compositions. Gravity surveys yielded low Bouguer anomaly values consistent with highly dismembered nature...

Abstract Several high‐sulfidation epithermal gold orebodies in the Mankayan Mineral District were formed an environment that has been already affected by earlier porphyry‐type mineralization. This study reports geologic and geochemical characteristics of Carmen Florence orebodies, which are located south Lepanto main enargite–gold orebody. The gold‐bearing quartz veins areas two types: (i) enargite‐rich (ii) quartz–pyrite–gold (QPG) veins. types mainly hosted Cretaceous Metavolcanics...

Auriferous quartz veins in the Namicupo gold prospect occur parallel to foliation of metasedimentary host rocks Xixano Complex northeastern Mozambique. The geochemistry and ore-forming mechanism have never been scientifically investigated. This study discusses ore mineralogy, fluid inclusion, stable isotope (S-O) characteristics prospect. mineralization is divided into two stages. Stage I, primary mineralization, represented by electrum with Ag contents 15–26 at.%, associated pyrite...

The Zambales Ophiolite Complex (ZOC) in the western portion of Luzon Island, Philippines represents a typical exposure an emplaced crust-upper mantle section ancient lithosphere. ZOC is divided into Acoje and Coto Blocks based on petrological, geochemical age disparities, thus implying diverse complex origins for archipelago's lithospheric sources. We used gravity magnetic data to reveal differences subsurface characteristics two ophiolite blocks first time. Low Bouguer (<135 mGal) (<69 nT)...

Abstract The Chifumbazi gold deposit is located in the Chifunde District, Tete Province, northwestern Mozambique. geology of study area composed Proterozoic Mualadzi Group comprising ultramafic metavolcanic rocks, quartzite, biotite‐schist, Macanda Mafic Metavolcanics, conglomerate, and granitoid Furancungo Suite. geological characteristics metallogenesis mineralization Province are poorly understood. This describes associated hydrothermal alteration on basis petrography, whole‐rock...

Abstract Lateral sampling of each blasting interval (~ 2.6 m) along a 79 m strike length was conducted for the Hosen 8‐2 vein on −5 ML (mining level, meters relative to sea level) Main ore zone in Hishikari epithermal Au deposit, Kagoshima, Japan. The horizontal variation mineral textures, bulk chemical compositions, and fluid inclusion temperatures apparent salinity fluids were determined. major gangue minerals quartz veins studied include adularia with minor amounts calcite smectite....

Abstract Magnetic data transformations are applied to the high-resolution magnetic from Masara gold district in southern Philippines enhance features related a porphyry copper prospect and epithermal deposit. Using several filtering methods structural mapping techniques, we were able highlight signal coming shallow chlorite-sericite alteration zone. Although veins mainly composed of nonmagnetic minerals, calculation tilt derivative grid revealed linear that coincident with surface projection...

The Acupan epithermal gold deposit is one of the Philippines' largest camps, having produced over 200 t Au in last century with average grades ∼ 6 g/t mostly from well-studied vein orebodies hosted by Virac Granodiorite. However, and breccia mineralization (90/99 veins GW orebodies, respectively) currently being mined northeastern portion less-studied Balatoc Diatreme. This study demonstrates role diatreme as a precursor to at Acupan, providing structural control focusing fluid flow along...

The lithocap at Mankayan is a contiguous zone of alunite + quartz pyrite that occur as pervasive alteration the metavolcanic basement and dacitic pyroclastic rocks. Alunite assemblage also occurs within hydrothermal gold-bearing veins breccias. Several high-sulfidation epithermal gold orebodies have been previously delineated in Lepanto Main Enargite orebody, Northwest, Carmen, Florence West East quartz-pyrite-gold (QPG) veins. This study presents new data mineral composition sulfur isotopic...

Abstract Provenance analysis using whole-rock geochemical data was carried out on the Late Oligocene to Early Miocene Zigzag Formation in southwestern Mountain Province, North Luzon, Philippines. Major and trace element geochemistry of siliciclastic samples from revealed a first-cycle mafic source detrital materials. This is consistent with other discrimination diagrams such as those La, Sc, Th determine provenance. Tectonic suggest an oceanic island arc signature for rocks Formation. The...

Abstract The Kematu Au‐Ag epithermal deposit at Tboli area, Province of South Cotabato, Mindanao, Philippines, contains an inferred mineral resource 3.8 million tonnes, 8.7 g/t Au and 27 Ag in 2012. is spatially genetically linked to the volcanism related Parker Volcanic Complex Pliocene Holocene age. Local extension northwest‐trending splays faults area are associated with mineralization, including deposit. study aimed provide a detailed description characteristics physicochemical processes...

Abstract The Omatapati copper and silver prospect within the Kaoko Belt is located in Opuwo district, Kunene region, Namibia. hosted by dolomite interbedded argillites of Neoproterozoic Devede Formation, Ombombo Subgroup. An ore body exposed shallow artisanal mining pits drill‐cores have grades 0.4 to 5.2 wt% Cu, 23 312 g/t Ag. was formed both hypogene supergene mineralization processes. occurred three stages. Stage 1 represented calcite veins containing chalcopyrite, bornite, sphalerite...

Abstract Rare earth elements (REE) play an integral part of modern life, from smartphones to satellites. Dubbed ‘critical metals’, the demand for REE has significantly increased, driven by growth in global production green technologies such as e-vehicles, solar panels, wind turbines, and other energy-economic infrastructure. Therefore, there is a need explore alternative sources ensure continued development emerging technologies. A possible source bauxite, which soil that forms intense...