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Geophysical signatures of copper-gold porphyry and ...

1.2. The predicted magnetic anomaly over a porphyry copper system 1.3. IP response of a porphyry copper system 1.4. Observed relationship between resistivity and weight percent sulphide content from in­ situ measurements of porphyry copper deposits 1.5. Cross-section of alteration zones characteristic of high-sulphidation deposits 1.6.

Crustal magmatic controls on the formation of porphyry ...

Jul 06, 2021· The large to giant porphyry Cu deposits in thin arc systems such as Papua New Guinea, Indonesia, Alaska and the Philippines 21,111,112,113,114,115 are, in general, characterized by higher Au and ...

Collective Mining Identifies a Large Gold Porphyry ...

Sep 16, 2021· The Company interprets the abundant precious metal mineralization encountered throughout the Guayabales Project to be related to multiple mineralized styles that include gold-copper-molybdenum porphyries and associated breccia as well as high grade, precious and base metal vein systems that are superimposed on and enrich the porphyry bodies.

Kincora Copper closes in on porphyry target at Trundle ...

Aug 17, 2021· "The wide interval of gold and alteration in TRDD022, and the extensive strike (over 500m) of near-surface skarn mineralisation seen in earlier holes, are strong evidence of a large multiple intrusive porphyry gold-copper system at the Trundle Park prospect," John Holliday, technical committee chair, and Peter Leaman, senior VP of ...

The geological characteristics, geochemical signature and ...

of global porphyry systems. About 5-10% of igneous rocks are high-K, yet these magmas are associated with approximately 25% of the combined Cu+Au+Ag US dollar value of global porphyry and epithermal deposits. The largest and richest gold-bearing, global porphyry systems are related to potassic magmas.

C3 Metals Identifies Significant Porphyry and Epithermal ...

Aug 30, 2021· The Central Inlier of Jamaica is an important copper-gold porphyry belt that is host to multiple high-level copper-gold porphyry systems and related gold-base metal quartz-carbonate epithermal ...

Porphyry and Epithermal Systems | PDF | Geological ...

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

Porphyry Copper Systems*

Introduction PORPHYRY Cu systems are defined as large volumes (10−>100 km3) of hydrothermally altered rock centered on porphyry Cu stocks that may also contain skarn, carbonate-replacement, sediment-hosted, and high- and intermediate-sulfidation epi-thermal base and precious metal mineralization.

New Assay Results for LCL's Giant Porphyry System

Jul 13, 2021· When LCL first found evidence of a big porphyry gold system in September 2020, its share price tripled. LCL then raised $10M (at 11.5c) to drill in all directions around it to see just how big it actually is. LCL has had three drill rigs going in parallel in Colombia, across its gold discovery and testing new targets in recent months.

Everything You Need to Know About Copper Porphyries ...

Mar 11, 2015· Porphyry deposits are very large, polymetallic systems that typically contain copper along with other important metals. Much of today's mineral production depends on porphyries: 60% of copper, 95% of molbdenum, and 20% of gold comes from this deposit type.

PORPHYRY DEPOSITS - Earth Sci

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 deposits that can be mined using mass mining techniques.

Alkaline-Related Gold Systems: An Overview | Seeking Alpha

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 magnetite replacement (Fig. 3). Fig. 3.

Porphyry Deposits 101 - Doubleview Gold Corp.

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.

LCL Delivers Highest Ever Grade at its Giant Porphyry System

Jun 22, 2021· LCL is hunting giant gold systems in the hills of Colombia, in a place called the Mid Cauca Porphyry Belt, a place dotted with many multi-million ounce gold deposits. A gold "porphyry" is a giant gold system that has easy to mine, large volumes of gold. These are usually monster deposits - and finding one is an exciting process for investors.

Epithermal Gold for Explorationists | Australian Institute ...

Epithermal gold (± Cu & Ag) deposits form at shallower crustal levels than porphyry Cu-Au systems, and are primarily distinguished as low and high sulphidation using criteria of varying gangue and ore mineralogy, deposited by the interaction of different ore fluids with host rocks and groundwaters. Low sulphidation deposits are in turn further ...

Ethos Provides Perk-Rocky Copper-Gold Porphyry Exploration ...

Sep 29, 2021· Highlights of Perk-Rocky Copper-Gold Porphyry Project. Six widely spaced diamond drill holes totaling 2,050 m across three target areas were completed. The drill holes cover an east-west span of ...

Pacific Ridge (PEX.V): Completes Drilling Program at ...

Sep 22, 2021· Numerous copper-gold porphyry systems worldwide are associated with skarn and carbonate-replacement deposits both distal and proximal to porphyry mineralization, thus this carbonate-hosted prospect represents an attractive target. About the Kliyul Project.

Evolution of Porphyry-Epithermal Gold Systems Using Trace ...

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]

Preliminary Model of Porphyry Copper Deposits

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.

Descriptive model of Porphyry Au - USGS

ORE CONTROLS/EXPLORATION GUIDES: Zoning of near surface hot-spring Hg-S deposits to zones of vuggy silica and advanced argillic alteration at depth hosting gold and/or silver quartz-chalcedony veins may indicate presence of porphyry gold system at depth of 0.5-1.0 km below paleosurface. Zoning may have a lateral component of 1-3 km. Ore bodies ...

Porphyry Deposits: General characteristics and modeling ...

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)

Porphyry Copper Systems | Request PDF

Sometimes the early porphyry gold system could be also telescoped by the later LStype epithermal gold mineralization, such as the Ladolam Au-(Cu) deposit in Papua New Guinea (Müller et al. 2002).

IGNEOUS PETROLOGY OF THE COLOSA GOLD-RICH …

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,

Anatomy of Porphyry-Related Mineralised Au-Cu-Ag-Mo …

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.

(PDF) Anatomy of porphyry-related Au-Cu-Ag-Mo mineralised ...

Introduction We have developed an understanding of porphyry-related ore systems by the analyses of many mines and exploration case histories during the post-WWII increase in demand for Cu and Mo, and rise in the price of precious metals since the late 1970's, aided by the use of magmatic arc active geothermal systems as modern analogies ...

Porphyry Deposits: The World's Largest Source of Copper ...

May 28, 2014· Porphyry copper deposits play an important role in the global economy. These deposits provide over 60% of the world's copper and include other important metals such as molybdenum, gold and silver. Porphyry copper deposits are known for their low grades and very high tonnage. A porphyry is not a rock type, but rock with a particular texture.

porphyry gold | Encyclopedia.com

Gold, Background Gold, recognizable by its yellowish cast, is one of the oldest metals used by humans. As far back as the Neolithic period, humans have col… Gold Reserve Act Of 1934, Lawrence H. Officer The gold standard is a monetary standard that ties a unit of currency, or money, to a stated amount of gold. Under this system, b… Precious Metals, Gold, silver, and …

List of Earth MRI focus areas with mineral system ...

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.

Sulfidation State of Fluids in Active and Extinct ...

environments and on sulfidation states of sulfide assemblages in calc-alkalic porphyry copper, porphyry-related base-metal veins, and epithermal gold-silver deposits. These data are contrasted with compositions of fluids from active systems by plotting vapor compositions on log f S 2 – 1000/T, R H – 1000/T, R S – 1000/T diagrams, where R ...

Beutong Copper Gold | Asiamet Resources

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").

The application of ZTEM to porphyry copper-gold exploration

Pebble, Alaska: The Pebble deposit is a major copper-gold porphyry system in southern Alaska. ZTEM results over the deposit have been presented earlier by Paré and Legault (2010). The geology (plan and section) are shown in Figure 2. In addition to the ZTEM, Spectrem was flown over the deposit and surrounding area. These results have proven

Reduced fluids in porphyry copper-gold systems reflect the ...

Mar 01, 2020· The quartz diorite porphyry intruded into the carbon-bearing wall rocks produced abundant CH 4 by thermal decomposition of organic matter (δ 13 C CH4 = −26.3 to −28.5‰), which changed the redox state of the porphyry copper system from oxidized to reduced condition. Ore elements were deposited via fluid boiling as a consequence of the ...

Collective Mining Identifies a Large Gold Porphyry

Sep 16, 2021· Collective Mining Identifies a Large Gold Porphyry Stockwork System at Surface Within the Victory Target Area at the Guayabales Project, Colombia. September 16, …