porphyry gold systems.
Evolution of Porphyry-Epithermal Gold Systems Using Trace Elements: Insights from the Iron Cap Deposit, Kerr-Sulphurets-Mitchell District, Northwestern British Columbia (NTS 104B) H.C. Graham, School of Earth and Environment, University of Leeds, Leeds, United Kingdom, [email protected]
Jul 15, 2019· Gold to silver ratio is much lower in alkaline porphyry systems than in alkaline epithermal systems. Alteration includes potassium, sodium, propylitic, and …
Oct 01, 1991· Reconstruction of the porphyry systems suggests that gold-bearing quartz stockworks were generated 600 to 1,000 m beneath paleosurfaces.Gold-rich porphyry mineralization in the Maricunga belt is closely comparable to that in the Philippines because of the association with dioritic to quartz dioritic porphyry stocks intruded into andesitic ...
Predicting gold-rich epithermal and porphyry systems in the central Andes with a continental-scale metallogenic GIS. L. Guillou-Frottier. IntroductionWhen BRGM (Bureau de Recherches Géologiques et Minières) undertook the development of GIS Andes, the underlying aim of the project was to develop a tool that would facilitate metallogenic ...
86 · Porphyry copper-molybdenum-gold systems operate in oceanic and continental magmatic …
The Beutong copper gold project ("Beutong") is a large is a large porphyry copper-gold system located in Nagan Raya Regency, Aceh on the island of Sumartra, Indonesia. Beutong comprises the Beutong East Porphyry ("BEP"), Beutong West Porphyry ("BWP") and the Beutong Skarn ("BSK").
10%· Intrusion-related gold systems: the present level of understanding. James R. Lang 1 & Timothy Baker 1 ...
Porphyryand epithermal-style mineral deposits together account for approximately 28% of global gold endowment (based on past production, reserves and resources), making them collectively of comparable importance to orogenic and paleoplacer deposits as a source of gold on the world stage (Lipson, 2014). Similarly in British Columbia (BC), 31.5% of gold produced has originated from porphyry and ...
Porphyry (/ ˈ p ɔːr f ɪ r i /) is a textural term for an igneous rock consisting of large-grained crystals such as feldspar or quartz dispersed in a fine-grained silicate rich, generally aphanitic matrix or groundmass.The larger crystals are called phenocrysts. In its non-geologic, traditional use, the term porphyry refers to the purple-red form of this stone, valued for its appearance.
The gold reserves can reach as several hundred or even thousands of tons, such as Grasberg, Bingham, and Kal'makyr.Such deposits can be referred to as Au-rich porphyry copper deposits or porphyry Cu-Au deposits (Sillitoe, 1979; Kesler et al., 2002).According to the composition of its beneficial components, porphyry copper systems can be divided ...
The Au-rich trend is defined to the greatest extent by seven, alkaline magma-related, porphyry gold systems (>1100 tons Au) and subordinately by numerous calc-alkaline systems (<1300 tons Au). The Cu-rich trend is defined only by calc-alkaline magma-related porphyry systems.Modelling of petrological and metal precipitation processes using a ...
The major products from porphyry copper deposits are copper and molybdenum or copper and gold. The term porphyry copper now includes engineering as well as geological considerations; It refers to large, relatively low grade, epigenetic, intrusion-related …
PORPHYRY MODEL. Porphyry Cu Systems Granitic cupola at 3-10 km depth Hydrothermal alteration & ores at 1 to >6 km depth Central high sulfide & metals Increasing low pH, high fS2 alteration upward in system Transition from deep Ppy Cu to shallow epithermal environm't Role of non-magmatic fluids traditionally restricted to dilute groundwater (meteoric)
In their worldwide database of porphyry copper deposits, Singer and others (2008) tabulated known or inferred ages for each tabulated deposit. Relations to Structures It is generally accepted that porphyry copper deposits are structurally controlled, but opinions vary as to the relative impor-tance of regional compared to local fault systems.
Apr 07, 2021· We did find a couple of gold companies operating in Colombia listed on the Candian stock exchange - these guys are a bit bigger and more advanced, something for LCL to aspire to as they continue to unveil their seemingly never-ending gold porphyry system: Gran Colombia Gold Corp - CAD $351M market cap; Aris Gold Corp - CAD $329M market cap
Dec 12, 2018· The first hole encountered classic porphyry-style alteration and sulphide mineralized rock units with geochemically anomalous gold concentrations throughout its 563 m length. This finding is ...
This paper describes the ZTEM airborne EM and magnetic results over the porphyry copper-gold camp at Cobre Panama, with a focus on the discovery of the blind Balboa deposit in 2010, the first documented case attributed to the ZTEM system. Balboa is the
HIGHLY PROSPECTIVE Copper/Gold/Moly Porphyry Targets EMERSON, GOATHORN and JACOBITE 03 THE TARGETS: NEW PROSPERITY GOLD -COPPER PORPHYRY DEPOSIT MODEL 15 EMERSON (50 km2) and GOATHORN (17.8 km2) have characteristics of New Prosperity gold-copper porphyry (7.7M oz. Au; 3.6 billion lb. Cu) JACOBITE(17.8 km2) has characteristics
Porphyry systems are a major source of copper and molybdenum, and also a significant source of gold and some critical metals essential to our society. They are formed at convergent margins in syn- and post-subduction settings in genetic association with magmatic rocks and host a variety of economic ore deposits – porphyry, skarn and epithermal mineralization.
Proterozoic porphyry-type versus oxidized intrusion-related gold systems in Brazil: some insights relevant to a new exploration frontier Published on April 25, 2019 April 25, 2019 • 198 Likes ...
Sep 03, 2019· It seems unbelievable but it's the gold company became the point of deeper understanding one local porphyry system and further imagination of the whole system. The Bereznyakovskoye gold deposit ...
The drilling assays at the Cliff porphyry system indicated multiple sub-parallel high-grade gold zones clustered along the Adam fault. The 2018 and 2019 drilling campaigns identified clusters of cm-scale massive sulphide veins in porphyry intrusions and host rocks, which appear similar to the gold-bearing veins found in the Snip gold mine.
Mar 01, 2020· Results from the Thursday's Gossan prospect revealed a monstrous shallow, very high-grade intersection — which included a 'stunning' 2m intersection grading 40 per cent copper, 3g/t gold and 517g/t silver. The potential for a bulk-tonnage porphyry copper-gold system at depth remains a …
Porphyry copper-molybdenum-gold systems operate in oceanic and continental magmatic arcs with calc-alkaline compositions. Aqueous supercritical fluids exsolved from felsic plutons and the apices of subvolcanic stocks form a variety of deposit types as they move upward and outward, split into liquid and vapor, react with country rocks, and mix with ground water.
systems have allowed us to apply time to porphyry systems and better understand their staged evolution as well as the evolved hydrothermal fluids which participate in low sulphidation epithermal vein formation (figure 3). Porphyry Au-Cu-Mo Although porphyry Au-Cu-Mo deposits display considerable variation, some broad generalisations are possible.
2.2.1 Geological setting. Mineral deposits that form in the porphyry-epithermal mineral system generally have a spatial and temporal association with intermediate to felsic sub-aerial volcanic rocks and related sub-volcanic intrusions. Although, geologically recent porphyry-epithermal mineral systems are mostly thought to form in magmatic arcs ...
Oct 01, 2002· 1.. IntroductionPorphyry copper deposits contain up to 100 t of gold and are among the largest reservoirs of gold in the upper crust (Kerrich et al., 2000).They are commonly surrounded by deposits and country rock containing gold that is thought to have been derived from them (Jones, 1992).Gold can be removed from porphyry copper systems by vapors that separate at high …
This large-scale system centers on a 10 km2 magnetic anomaly and is highlighted by an intense hydrothermal alteration signature. Surrounding the porphyry system is an associated high-grade silver and gold-rich epithermal system measuring at least 8 km by 2 km that hosts 56 identified vein, replacement and breccia structures.
Porphyry copper-gold deposits form in a variety of volcanic environments, most commonly in continental margins and intra-oceanic arcs. These are large scale magmatic-hydrothermal systems associated with a series of porphyritic intrusions, which result in extensive alteration footprints that we map and model to target high grade copper-gold mineralization.
Jun 03, 2021· VANCOUVER, BC / ACCESSWIRE / June 3, 2021 / BCM Resources Corporation (TSXV:B), the "Company" is pleased to announce that core drilling has begun at its Thompson Knolls ("TK") intrusive-hosted, porphyry copper-gold system discovery. BCM made this discovery in the spring of 2018 with its drillhole TK18-1. There are five 5 diamond core holes permitted to depths of 3,600 feet …
Visible Gold at Big Bulk. LCT's Big Bulk claims cover 26 square kilometers over an alkalic Au/Cu porphyry system with visible gold at surface and well-documented similarities to the Brucejack porphyry/epithermal gold camp. The claims host both epithermal Au and Au/Cu porphyry drill targets.
Apr 15, 2016· 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 epithermal deposits.
The Guayabales host outcropping mineralized porphyry systems with excellent gold, copper and molybdenum grades. Location. Caldas, Colombia. Status. Exploration. Guayabales. The Guayabales project lies 75 km to the south of Medellin and is located immediately along strike and adjacent to the Marmato gold mine. The project locates in the NW ...
Gold, 2009). The Colosa porphyry has inferred resources of 468.8 Mt at 0.86 g/t (AngloGold Ashanti, 2008) which makes it the porphyry gold system with the biggest tonnage of material and contained Au discovered to date (Fig. 2). Regional Geologic Setting The Central Cordillera of Colombia has a complex history of collision, accretion, faulting,
Jan 14, 2020· As discussed in detail by ref. 28, in shallow porphyry systems (<~3 km) gold and copper solubility decreases rapidly in an expanding S-rich vapour, which carries both metals. The result is …
16 Moz gold and >600 Moz silver. 10 Tops of porphyry copper deposits. Guinaoang porphyry copper-gold system, Philippines Discovered 1983, RGC Exploration >500 Mt @ 0.4% Cu, 0.4 g/t Au. Deposit concealed beneath advanced argillic lithocap containing highsulphidation mineralization. 11 Tops of low- and intermediate-sulphidation
The gold byproduct of porphyry Cu deposits, as well as gold in epithermal deposits (high and intermediate sulfidation) in these intrusion-centered systems (see Sillitoe, 2010, Porphyry Systems ...
ralised systems are defined within the Late Ordovician Gidginbung Volcanic Complex (Figure 2), including the historical Gidginbung high sulphidation gold mine and a number of mineralised porphyry prospects including Yiddah, Mandamah, Cullingerai, Estoril a. nd the Dam deposits.
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