Porphyry-type ore deposits are among the world's premier metal resources, supplying most of the copper, molybdenum, and a substantial part of gold production ().They form in response to focused expulsion of metal-bearing saline fluids from large chambers of cooling hydrous magma ().A restricted zone of ore-mineral precipitation within a more …

A characteristic alteration feature of, e.g., hypogene ore deposits within large porphyry ore deposits is distinct potassium alteration of the host rock caused by the infiltration of magmatic-thermal fluids ... Magmatic processes in the development of porphyry-type ore systems. Econ Geol 100:25–37.

The Tuwu porphyry copper deposit is located on the Dananhu-Haerlik island arc in eastern Tianshan, NW China. Based on geology, petrology, and in situ trace element studies of pyrite and chlorite, we redefined the …

A plot of As/Se vs. Co discriminates the three ore types that occur associated with porphyry-skarn Cu systems in the Middle and Lower Yangtze belt (MLYB). These results indicate pyrite chemistry ...

Zhunuo is a porphyry deposit in the western GPCB. It was discovered in 2004 by the No. 2 Geology Survey Team of Tibet, China. Zhunuo contains 2.3 Mt copper metals at an average grade of 0.57% (Sun et al. 2018).Previous studies have reported zircon U-Pb ages, geochemistry of igneous rocks and molybdenite Re-Os ages for the deposit …

Aims & Scope. Announcement: From January 2022 Ore Geology Reviews will become an open access journal. Authors who publish in Ore Geology Reviews will be able to make their work immediately, permanently, and freely accessible. Ore Geology Reviews continues with the same aims and scope, editorial team, submission system and rigorous …

The formation of porphyry-type ore deposits is relatively well understood 1,2, but important pieces of the puzzle are still missing. In particular, it is commonly accepted that magmas beneath ...

The reduction of the Vp/Vs in the subsurface is characteristic of various types of hydrothermal ore deposits including IOCG 17, porphyry and epithermal Au-(Cu) 20, and porphyry Cu-(Mo) deposits 16,18.

Porphyry ore deposits are the source of much of the copper, molybdenum, gold and silver used by humans. ... T., Oberli, F. & Heinrich C. A. The magma and metal source of giant porphyry-type ore ...

Porphyry-type deposits are the world's main source of copper and molybdenum and provide a large proportion of gold and other metals. ... P., Driesner, T. & Heinrich, C. A. Porphyry-copper ore ...

To make ore, fractures must be closely spaced; generally grades are better where there are several orientations (directions). If you are doing geochemical soil or stream silt sampling, copper is the best pathfinder …

Porphyry copper deposits are large. They commonly consist of hundreds of millions to billions of tonnes of ore. However, they contain typically only 0.5–1.5% copper and are therefore classified ...

The relative proportions of ore metals (Cu, Au, and Mo) in porphyry-type deposits are variable, and systematic criteria to explain this variation are difficult to isolate . Crustal magmatic processes may have an important influence on metal ratios, whereas hydrothermal precipitation within the porphyry vein network appears not to strongly ...

Nature Geoscience - Giant ore deposits are priority targets for mining companies. A review of the characteristics of several giant porphyry and epithermal …

The magma and metal source of giant porphyry-type ore deposits, based on lead isotope microanalysis of individual fluid inclusions. Earth Planet. Sci. Lett. 296, 267–277 (2010).

Ore types, including rock and alteration data, are used to determine operational parameters for each part of the process. The assessment of ore types, and …

a Cu (Mt) vs. Au (tons) of porphyry Cu–Au deposits; b ore duration (Ma) vs. Au (tons) of porphyry Cu–Au deposits. All deposits are roughly distributed along either one or the other of the two ...

Porphyry Systems and Skarns 10.1 Introduction Metallic ore deposits related to porphyry systems encompass a wide variety of types that can be characterised in terms of geotectonic setting, metal content, hydrother­ mal alteration pattern and the nature of the associated granitoids and wall rocks.

Andrew, R.L., 1995, Porphyry copper-gold deposits of the southwest Pacific: Mining Engineering, v. 47, no. 1, p. 33 38.

The Yanbei deposit is located in the southeastern part of the Mikengshan volcano-plutonic center, and the proven metal reserves include 102,000 t Sn (average ore grade: 0.85% Sn, cut-off grade of 0.20% Sn), and 30,000 t Cu (average ore grade:0.25%) (GSSJP, unpub. report, 2017).The Yanbei tin mineralization is predominantly hosted in …

Large Size, Low Grade – Porphyries typically have 100 million to 5 billion tonnes of ore with a lower grade (0.2% to >1% copper). It is the size of these deposits that allow for bulk mining and economies of scale. Long Mine Life – The size of porphyry systems usually mean that the life of the mine can be multi-decades long.

A key finding of this paper is that most volcanoplutonic arcs above subduction zones are prospective for porphyry ore formation, with probabilities only …

The global supply of Mo and much of Cu and Au comes from porphyry-type ore deposits associated with hydrous magmas of broadly calc-alkaline composition, thought to be generated by contemporaneous subduction zone processes. Molybdenum is generally considered to be derived from the continental crust while Cu and Au are sourced in the …

Figure 1 shows an example of the most common porphyry copper ore type beneficiation flowsheet. Porphyry ores, although generally contain small amount of copper below 1%, belong to easy-to-float ...

Abstract. Porphyry Cu systems host some of the most widely distributed mineralization types at convergent plate boundaries, including porphyry deposits centered on intrusions; skarn, carbonate-replacement, and sediment-hosted Au deposits in increasingly peripheral locations; and superjacent high- and intermediate-sulfidation …

1. Introduction. Collisional orogeny generally shows a low potential for the formation of hydrothermal ore deposits [1], [2].In contrast, a large number of hydrothermal ore deposits occur in accretionary orogens such as the Tethyan orogen [3] and the circum-Pacific orogens [4], [5], including porphyry Cu–Au–Mo [6], epithermal …

Brassy chalcopyrite is one of the common ore minerals in porphyry deposits. Over time, weathering of the near-surface rocks and the infiltration of surface water, can …

The field features of porphyry deposits include the following: 1. Intrusive Rocks: The main host rocks for porphyry deposits are intrusive igneous rocks, such as granites and diorites. …

The Dasuji ore deposit is a large-scale porphyry Mo deposit at the northern margin of the North China Craton, China. Four stages of hydrothermal veins were recognized in the deposit, from early to late: K-feldspar–quartz veins (stage 1), quartz–molybdenite veins (stage 2), quartz–carbonate–pyrite–galena–sphalerite veins …

The formation of the Questa porphyry Mo deposit is closely associated with the volcanic and tectonic activity during the Tertiary Rio Grande rifting at the Southeastern end of the Rocky mountain chain (Fig. 1a). Volcanism and magmatism during that time also formed the large San Juan volcanic field, as well as other Climax-type …