Porphyry is a stone material, volcanic in origin, characterised by its development along parallel planes (photo n. ). This characteristic allows for it to be used as a semi-finished product (untreated photo n. ) as well as after “splitting”. Porphyry’s considerable resistance to wear and tear, due to atmospheric agents, is the feature that has consented to its diffusion in street furniture but ...

a high percentage of world copper production is obtained from porphyry copper reserves, these reserves are characterized by: very high tonnage, greater horizontal dimensions than vertical, association with stock like intrusion masses, dispersed minerals in the porphyry mass and in its neighbor rocks, intense sericitization and inplace silicification. the porphyry coppers are concentrated by flo...

Nos travaux s’insèrent dans un projet du réseau ARTCADHi visant à offrir aux chercheurs en Sciences Humaines des assistants à la construction du sens dans des bibliothèques numériques spécialisées. Dans ce cadre, limiter la description des documents à une indexation unique, fixe et effectuée par un tiers, revient à nier leur expertise. Porphyry propose l’instrumentation du travail des chercheur...

The Qulong porphyry copper and molybdenum deposit is located at the southwest margin of the Lhasa Terrane and in the eastern region of the Gangdese magmatic belt. It represents China’s largest porphyry copper system, with ∼2200 million tonnes of ore comprising 0.5 % Cu and 0.03 % Mo. The mineralization is associated with Miocene granodiorite, monzogranite and quartz-diorite units, which intrude...

To reconstruct the magmatic–hydrothermal processes leading to porphyry Mo ore formation at the Climax Mo mine, Colorado, four magma units that were emplaced before, during and shortly after the mineralization events were investigated: (1) a pre-mineralization white dike of the Alma district; (2) the syn-mineralization Chalk Mountain Rhyolite; (3) a lateto post-mineralization rhyolite porphyry d...

Jiama is a super-large porphyry copper–polymetallic deposit located in the Gangdese metallogenic belt of southern Tibet. The consists combination polymetallic skarn, Cu–Mo mineralization at contact between Porphyry and hornfels, distal Au fault. current metal reserves are 7.4 Mt Cu, 0.6 Mo, 1.8 Pb–Zn, 6.65 Moz Au, 360.32 Ag, with skarn to porphyry–hornfels host-rock ratio ~3:1. Based on detaile...

referred to as the Main Copper zone (Figur : 6-2-2). I h j pecting in the Brucejack Lake $rea continuel 1 intermimnt:.y until 1959, when gold and siher mineraliz Ition was first reported. In 1960, Granduc Mines Ltd. st& :d most of the area comprising the current property and bel an an explom tion program for porphyry copper mineralii ation, emplo:iing airborne and ground geophysics in add Ition...

The spectral and spatial properties of the advanced spaceborne thermal emission and reflection radiometer (ASTER) data can be used in detailed lithological and hydrothermal alteration mapping related to copper and gold mineralization, particularly the shortwave infrared radiation subsystem where hydrothermal alteration minerals have diagnostic spectral absorption features. This paper reviews th...

The Geological Survey Office (GSO) undertook a pilot study with the objective of assessing the ability of Survey data to support modern quantitative mineral potential modelling techniques. The Yarrol pilot project was designed to audit digital data sets routinely produced by the GSO, and to provide mineral assessment outputs relevant to both industry and Government decision-making processes. Th...