Porphyry deposits remain one of the key exploration targets for major mining companies. Geological Methods in Mineral Exploration and Mining Second Editionwww.mining-eng.ir. Ultimately, two distinct styles of epithermal gold deposits are readily recognised: high-sulphidation, acid sulphate and low-sulphidation,.

The Giant ore deposits are priority targets for mining companies. These veins have been mined and produced by PT Cibaliung Sumber Daya - subsidiary of PT Aneka Tambang Tbk. 1999 (Bakke, 1994) The Dayingezhuang Gold deposit is one of the largest gold deposits with 283-t gold reserve and 297-t silver Colloidal transport of gold and silica in epithermal precious metal systems: Evidence from the Sleeper deposit Major advances on deep prospecting in Jiaodong gold ore cluster and its metallogenic characteristics: Gold. Epithermal Gold Deposits A very important style of gold deposit Can be very big: Lihir, PNG 170 Mt @ 3.5 g/t Au (595 t or 19.13 Moz Au) Porgera, PNG 85 Mt @ 5.8 g/t Au, 33 g/t Ag (493 t The gold mineralisation is SEG Newsletter, 23, 9-13. has been cited by the following article: TITLE: Diversity 13.4.8 Future of Dating for Ore Geology and Mineral Exploration. We look at intuitive coding and thematic attributes in ME-ICP and XRF data at deposit and at district scales.

Reviews in Economic Geology, 13, 245-277. (2000) by J W Hedenquist, R A Arribas, U E Gonzalez Venue: Rev. In March 2012, a helicopter-borne versatile time-domain electromagnetic (VTEM), magnetic and radiometric survey was flown over the Cerro Quema high sulphidation (HS) epithermal gold deposits and the surrounding area. Skip to content. High-grade deposits of silver and gold were discovered in 1880 and the area was a major producer until the 1893 silver price crash. The deposits range from gold-rich porphyry-style deposits, to deep-seated precious and base metal bearing stockworks and veins, to near-surface replacement-type gold mineralization. Lihir Island is part of the 150-km-long, alkalic Tabar-Lihir-Tanga-Feni (TLTF) volcanic island chain that is located in the New Ireland basin. A discussion follows concerning the magnetic response and electrical properties over gold-rich porphyries and epithermal deposits. This compilation presents a summary of the geological and exploration characteristics of some key Mio-Pliocene age (23 to 2.5 million year old) High Sulphidation Epithermal (HSE) gold-silver Geol. The mineralization is hosted within the Palu Metamorphic Complex. (1982) Igneous and Metamorphic Petrology of Lavas and Dykes of the Macquarie Island Ophiolite Complex.

They eventually create metallic-rich fluids concentrated in a selected volume of rock, which become supersaturated and then precipitate ore minerals. High-grade deposits of silver and gold were discovered in 1880 and the area was a major producer until the 1893 silver price crash. Mineralization of this area is strong identified as low sulfidation epithermal system. Hedenquist, J. W. and Arribas, A. CHARACTERISTICS 1 AND EXPLORATION GUIDELINES by Donald A McIver Rhodes University 1997 . Gold from Lebong Tandai Drillcore, 2007Epithermal Gold DepositsA very important style of gold deposit. Cikoneng and Cibitung veins. They include some of the worlds highest grade and largest porphyry-related gold resources (e.g., Ridgeway: 73 Mt @ 1.76 g/t Au, 0.62 % Cu 4.1 Moz Au, 0.45 Mt Cu; 2 Gold from Lebong Tandai Drillcore, 2007 Epithermal Gold Deposits A very important style of Park: so, its quite possible that major epithermal gold deposits are forming right now under Yellowstone! Now what are characteristics of epithermal precious metals deposits? Fluid Inclusions in Hydrothermal Ore Deposits. Original (1948), Minerals of Western Australia, Vol 1, pp 350, 1948 Mount Charlotte Gold Mine; Pasi Mesozoic epithermal gold deposits in eastern China are divided into calcalkaline and alkaline magmarelated gold deposits, and are also grouped as lowsulfidation, intermediatesulfidation and highsulfidation types, of which the first two predominate. Key Words: alkalic, porphyry, copper, epithermal, gold Abstract Alkalic gold-(copper) deposits are of increasing economic significance and are an attractive exploration target. In some occurrences, minerals can be extracted for a profit by mining. An understanding of the characteristics of these styles can aid in the prioritisation of the more prospective projects and assist in dealing with pitfalls such as supergene enrichment and irregular Au distribution. Epithermal Au and Ag deposits of both vein and bulk-tonnage styles may be broadly grouped into high-, intermediate-, and low-sulfidation types based on the sulfidation states of their hypogene

Epithermal ore deposits form at shallow depth and are typically tabular (two Orogenic gold deposits, or gold deposits in metamorphic rocks, are the spatially and temporally most widespread gold deposit type, defining important exploration targets in Precambrian Main deposit types and clans The term orogenic has been o riginally introduced by Groves et al. TORONTO, CANADA--(Marketwire - Sept. 5, 2012) - Seabridge Gold ()() announced today that exploration drilling this summer on its 100%-owned KSM Project in northwestern British Columbia has discovered an epithermal style of gold occurrence which contains significant widths of higher gold grades including narrow veins with the highest gold grades found at the project to White, N.C. and Hedenquist, J.W. EPITHERMAL GOLD DEPOSITS: STYLES, CHARACTERISTICS AND EXPLORATION EPITHERMAL GOLD DEPOSITS: STYLES, CHARACTERISTICS AND The Toodoggone district in northeastern BC hosts numberous epithermal-type mineral deposits and occurrences and porphyry mineralization. Importantly, the exploration implications of deposit style facilitates targeting of higher Au-Ag grade ores. The granite porphyry, chromian sericite, and Cr elements anomaly are the significant gold ore-prospecting indicators. Epithermal deposits typically form above the level of Porphyry Cu-Au deposits Results 1 - 10 of 39. Most of these deposits are located in the western Pacific. This success points to the applicability of regional helicopter EM-Mag-Spec surveys for the exploration of similar high sulphidation epithermal gold deposits to depths <500m in weathered terrains.

With over 20 years of exploration experience he has analyzed the geophysical footprints of copper, gold, and nickel deposits on six continents. Scenarios presented cover a range of possible resource conversion factors (40 to 100 percent). The successful exploration geologist uses knowledge of geologic relationships and ore-deposit styles, tempered by experience, to interpret all information This paper is a summary of late Cenozoic magmatism and epithermal gold-silver deposits in the northern Great Basin (north of latitude 3730'N). Low-sulfidation epithermal deposits and orogenic gold deposits are characterized by low-salinity brines, often with a significant carbonic component, where gold is mobilized as a reduced The formation processes of the complex 34 S variations for the Jiaodong-type gold deposits are still equivocal, which cannot give a robust identification for the sulfur sources, by inference, Au sources. Little sulphidation epithermal deposits. Selected West Pacific Epithermal Gold Deposits. In the spirit of encouraging the development of appropriate models of prospects during exploration, the Taheri, J., and Bottrill, R. S., 1998, Porphyry and Sedimentary-hosted Gold Deposits near Cygnet: New Styles of Gold Mineralisation in Tasmania: Unpub Rept, Mineral Resources Tasmania. 1) Magmatic vapour condenses in meteoric water 2) Gold transported as Au (HS) 2-3) Water rises and boils, releasing H. 2. An understanding of the characteristics of these styles can aid in the prioritisation of the more prospective projects and assist in dealing with pitfalls such as supergene enrichment and Early Miocene metallogenic event formed the Bosawa lowsulfidation epithermal gold deposit, Northeast Japan arc. 13.5.5 Porphyry Cu Deposits. The gold mineralization is related to the late stage of Late Jurassic (ca. Ladolam gold deposit is located on Lihir Island, Papua New Guinea and is the worlds largest low sul dation, alkalic epithermal gold deposit in terms of contained gold. University of Tasmania, Lamuntet is one of gold ore mining area carried out by the Artisanal Small scale Gold Mining (ASGM) located in West Sumbawa, Indonesia. Introduction. Since the 1970s most of the mineral exploration effort has been directed towards finding gold-rich deposits on the Islands. Provided there is a clear appreciation of survey objectives and a good understanding of the changes in physical properties which rocks undergo during hydrothermal alteration,

Geology and Genesis of the Mount Skukum Epithermal Gold-Silver Deposits, Southwestern Yukon (NTS 105 D/3, 6). Hydrothermal epithermal deposits consist of geological veins or groups of closely Characteristics. ,2000; Sillitoe and Hedenquist, 2003), but the intermediate sulfidation seems to be rather a transitional term between high and low degree of system sulfidation closer to sulfide-poor style. This Paper. Hydrothermal gold deposits contribute a noteworthy fraction of the worlds gold endowment, with the epithermal deposit class contributing up to 13% of the global gold production. High-grade deposits of silver and gold were discovered in 1880 and the area was a major producer until the 1893 silver price crash. (2000) by J W Hedenquist, R A Arribas, U E Gonzalez Venue: Rev. Geol. Epithermal Gold Deposits : their characteristics & modeling. except the Florence mine were consolidated as the Goldfield Consolidated Mines Company in late 1906. Little production or modern exploration has occurred since. Introduction. 13.5.1 Introduction. The geochemical footprint of the giant Fruta del Norte (FDN) epithermal gold-silver deposit, located in the sub-Andean zone of south-eastern Ecuador, is examined using insightful quantitative geochemical and spatial studies. Hishikari gold mines Keisen No. San Ignacio has operated for 10 years, with high grade silver and gold material continually trucked to Great Panthers Cata mill for processing. Department of Geology & School of Environmental Studies University of Delhi Delhi-110007 India Ore deposits: Lihir, PNG 57 The deposits exhibit a range of characteristics that vary over a wide range of emplacement depths (1km to 7km). Some of the resources can be very large (e.g. Introduction. TORONTO, CANADA--(Marketwire - Sept. 5, 2012) - Seabridge Gold (TSX:SEA.TO - News)(NYSE:SA - News) announced today that exploration drilling this summer on its 100%-owned KSM Project in northwestern British Columbia has discovered an epithermal style of gold occurrence which contains significant widths of higher gold grades including narrow veins with Altmetric Cooke, DR A diversity of epithermal deposit styles can form in

Prismo Metals is an exploration company targeting high-grade silver and gold projects in Mexico, one of the worlds top producers of precious metals. 277, pages 9-20. 13.5.2 Mississippi Valley-Type Deposits. high sulphidation epithermal gold deposits were observed in the EM, magnetic and radiometric data over the known deposits. NaCl eq. Next 10 . Magmatic Little 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 o f varying gangue and ore mineralogy, deposited by the interaction of different ore fluids with host rocks and groundwaters. adularia-"-" . Epithermal Gold Deposits A very important style of gold deposit Can be very big: Lihir, PNG 170 Mt @ 3.5 g/t Au (595 t or 19.13 Moz Au) Porgera, PNG 85 Mt @ 5.8 g/t Au, 33 g/t Ag (493 t Can be very rich: Cripple Creek, USA 630 t Au in veins grading 15 to 30 g/t Hishikari, Japan 264 t Au, Honko veins 70 g/t Au, 49 g/t Ag The Beskauga deposit is a gold-copper-silver deposit with a NI 43-101 compliant Indicated Mineral Resource of 111.2 million tonnes grading This lecture should be read in conjunction with the porphyry lecture. Hedenquist, et al., report that epithermal ore deposits form at shallow depth. Prof. Mihir Deb. The mineralization is of the well-documented Low-Sulphidation Epithermal type. characteristics, genesis and exploration. Acknowledgments. Exploration for epithermal gold deposits. Axi gold deposit and its peripheral ore deposits Yierm ande, Qiabukanzuota, which formed in Late Paleozoic volcanic rocks in West Tianshan Mountains, are considered as epithermal mineralizing type, and divided furtherly in to adular-sericite type and silicated rock type.The gold deposits are formed in Tulasu-Yelimodun volcanic belt of Yili Late Paleozoic rift.And the country Little production or modern exploration has occurred since. Overview. ABSTRACT. See SEG Newsletter No. Alternation zone: Aerially extensive and visually prominent due to acidic alteration of volcanics to bleached clays. (2017) der features relevant to exploration and assesEpithermal ore deposits: first-or sment, in Proceeding of 14th SGA Biennial Meeting: Mineral Resources to Discover - Volume 1. S and destabilizing Au(HS) 2 The second tion gold-silver deposits are restricted to the western andesite assemblage (John et al., 1999). Studies indicate alkaline gold systems fall into two main categories, i.e., relatively low-temperature, shallow (<1-2 km), epithermal-style The host rocks consist of granite, biotite gneiss, and biotite schist, which is intercalated by Company Highlights. These deposits include well known types like epithermal gold-silver, (low sulfidation and high sulfidation), polymetallic silver-gold, sediment hosted replacement gold (carlin-type), carbonate gold-silver The mineralization is of the well-documented Low-Sulphidation Epithermal type. The Gaosongshan epithermal gold deposit in Heilongjiang, Northeast China, is hosted by the Lower Cretaceous intermediate-basic volcanic rocks. Indian and Northern Affairs Canada, Exploration and 23, pp. Existing geochronological results indicate that the porphyry and at least some of the highly-varied epithermal systems are formed around the same time and as a result of the same processes. 14, pages 12-13 for that discussion. He joined Geoscience Australia in 2001 where he studied the geochemical and geophysical exploration vectors for numerous major copper, gold, and nickel deposits across Australia. 13.5.3 Volcanogenic Massive Sulfide (VMS) Deposits. Economic elements associated with epithermal deposits include gold, silver, lead, zinc, copper, antimony, arsenic, and mercury. Minerals may include: native gold and silver, argentite, tennatite, enargite, gold tellurides, electrum, stibnite, and cinnabar. Minor elements include tellurium, copper, zinc, lead, and bismuth. (1995) Epithermal Gold Deposits: Styles, Characteristics and Exploration. It is both an open pit and underground operation by Barrick Gold Corporation, the largest gold mining company in the world. Some porphyry deposits are significantly endowed with tin and/or tungsten. Most explorationists regard epithermal gold deposits as those formed at higher crustal levels than porphyry environments, although many are telescoped upon deeper porphyry systems. High-grade deposits of silver and gold were discovered in 1880 and the area was a major producer until the 1893 silver price crash. Full PDF Package Download Full PDF Package. The Cerro Quema deposits are located in the Azuero Peninsula, Panama, approximately 8 km east of Gerita. sericite types. replacement deposits and epithermal veins) can be enriched in zinc, lead and silver. 91-94. J.W. Epithermal gold deposits offer some of the largest and highest grade gold mines in the world. The Tour - Geological Summaries of the deposits and regions to be visited. 1) Magmatic vapour condenses in meteoric water 2) Gold transported as Au (HS) 2-3) Water rises and boils, releasing H. 2. Exploration for epithermal gold deposits. Abstract.

Econ. Tools. Epithermal Gold Deposits : their characteristics & modeling. The district contains an Ordovician Volcanic centre that has been explored over many years and hosts a number of defined porphyry and epithermal deposits. The focus is on variations in the composition, tectonic setting, and eruptive style of the Most of the miners at this area are not the local miners but also those from other regions. The transition from porphyry- to epithermal-style gold mineralization at Ladolam, Lihir Island, Papua New Guinea: a Exploration and Mining around the Pacific Rim, 10-13 October 1999, Bali, Indonesia, The AusIMM, Melbourne, Proceedings volume, pp. Styles, characteristics and exploration Epithermal gold deposits. Styles, characteristics and exploration Epithermal ore deposits form at shallow depth. This conclusion was initially based on geologic reconstructions, ore mineralogy and related textures (Lindgren, 1933).

Download Download PDF. In the production process, the veins have reached the maximum limit. A diversity of epithermal deposit styles can form in convergent margin settings around the Pacific Rim. Geological models for the exploration and evaluation of epithermal Au and porphyry Cu-Au deposits rely upon a classification of different the deposits. While the characteristics of the geology and mineralization of low sulfidation epithermal deposits are generally well known and many papers (e.g. Descriptions of many of the mineral occurrences are documented in company assessment Exploration & mining Placer gold 1902 in creeks down stream Au-W veins & skarns 1913 peripheral to FK Bismuthinite with Au 1980 proximal creeks Visible Au in granite 1984 Advanced exploration 1987 to 1994 Construction 1995; bulk tonnage open pit Production 1996; 169 Mt @ 0.93 g/t 1 M.oz. References. Porphyry Mo deposits are an important source of Mo, and have attracted a significant number of studies (e.g., Cannell et al., 2005, Cooke et al., 2005, Klemm et al., 2008, Sillitoe, 2010, Wang et al., 2016).In the past 10 years, many Mo deposits have been discovered in northeast (NE) China, and the region is becoming one of the most important Mo The successful exploration geologist uses knowledge of geologic relationships and ore-deposit styles, tempered by experience, to interpret all information available from a given prospect in

Prof. Mihir Deb. Epithermal ore deposits: environments and variations of Au-Ag mineralization. Epithermal deposits are distinctive from low-grade bulk tonnage deposits such as porphyries in that they are typically high-grade, small-size deposits. Carlin-type gold deposits in NevadaCritical geologic characteristics and viable models: Economic Geology, 100th Anniversary Volume by Jean S . Grant/Award Number: Study of hydrothermal Cu deposits/20K04123 Read the full text. GST) LITERATURE COLLECTION. Epithermal deposits typically form above the level of Porphyry Cu-Au deposits (Figure 4). Unlike the Copper- mineral deposit types including skams, precious metal veins, hot spring gold, perlite, bentonite, alluvial sands and coal. The 46 Moz. (a) Paleoplacer Deposits (b) Lode gold deposits (c) Epithermal vein type deposits(d) Sediment hosted deposits, (e) Hot spring deposits and (f) Porphyry deposits The

3 vein (left). o C and salinity of 0.18-0.53 % wt. Gold from Lebong Tandai Drillcore, 2007 Epithermal Gold Deposits A very important style of gold deposit Can be very big: Lihir, PNG 170 Mt @ 3.5 g/t Au (595 t or 19.13 Moz Au) Porgera, PNG 85 Mt @ 5.8 g/t Au, 33 g/t Ag (493 t Can be very rich: Cripple A diversity of epithermal deposit styles can form in convergent margin settings around the Pacific Rim. Next 10 . Tl and Sb from drilling. Department of Geology & School of Environmental Studies University of Delhi Delhi-110007 India Ore deposits: Classification vs Modeling Each ore deposit is unique like a persons finger print This uniqueness arises out of : Y fundamental differences in processes and environments Y local, site-specific Little production or modern exploration has occurred since. 1 These deposits have widespread hydrothermal alteration that is formed due to the interaction of hydrothermal fluids with the enclosing wall rocks, and the alteration mineral Pasi Eilu (2003) Exploration for orogenic gold deposits. Mineralization exists within an epithermal quartz vein system called La Luz, which is a large regional tectonic structure that also hosts Endeavour Silvers Bolanitos Mine. The objectives of this paper are to provide an update on gold deposit models, and what new approaches and techniques can now be used to discover gold Exploration & mining Placer gold 1902 in creeks down stream Au-W veins & skarns 1913 peripheral to FK Bismuthinite with Au 1980 proximal creeks Visible Au in granite 1984

Irina V Apukhtina. 13.5.4 Epithermal Gold and Silver Deposits.

Abstract. High-grade deposits of silver and gold were discovered in 1880 and the area was a major producer until the 1893 silver price crash. The literature review notes the lack of examples of the geophysical characteristics of gold-rich porphyries. Deposits in shallow crustal settings (~5 km) are associated with stocks, sills, dykes and volcanic domes and include systems with epithermal-style veins to breccia and stockwork similar to porphyry-type settings. 30 Full PDFs related to Fennoscandian Exploration and Mining 2003 Rovaniemi, Finland December 2003; Simpson, E.S. A few other OTHER EXPLORATION GUIDES: These deposits are found in second order structures adjacent to Epithermal Gold Deposits: Characteristics and a Model for their Origin; in High-temperature Acid Fluids and Associated Alteration and Mineralization, Geological Survey of Japan, Report No. Epithermal and Porphyry Gold - Geological Models. Date posted: 03/19/16. For example, the characteristic form of these two styles of epithermal deposit is different (Table 2). S and destabilizing Au(HS) 2-4) Gold deposits as the native metal Au(HS) 2-+ H + + 0.5 H. 2.

PDF. This salinity corresponds with a minimum hydrostatic pressure of about 10-55.1 bars. capitalizing upon the unique insights provided by epithermal neutrons on the behaviour and properties of an increasing number of complex materials. Abstract. Epithermal deposits are the products of large-scale hydrothermal convective systems driven by magmatic heat in the upper 510 km of the Earths crust. sulphidation epithermal deposits. High-grade deposits of silver and gold were discovered in 1880 and the area was a major producer until the 1893 silver price crash. A short summary of this paper. MARCH 1996 CITATIONS 9 READS 40 4 AUTHORS, INCLUDING: Jeffrey Hedenquist University of Ottawa 115 153146 Ma) magmatism. 4750. General geochemical properties and abundance of the rare earth elements. Epithermal gold for explorationists; Corbett G - 2002, in AIG Journal, Paper 2002-1, pp 1-26. 1. The total measured resource for Chah Zard is 2.5 million tonnes of ore at 12.7 g/t Ag and 1.7 g/t Au (28.6 t Ag, 3.8 t Au), making it one of the largest epithermal gold deposits in Iran. Carlin-type gold deposits in Their characteristics are well-documented (Sillitoe, 1989, 2000, 2010; About. Quebec, Canada: Society for Geology Applied to Mineral Deposits, pp. The 34 S and trace elements of ore-related pyrite collected from the northwestern Jiaodong gold province (Jiaojia and Sanshandao-Xinli goldfields) are analyzed by in-situ Henderson, P. (1984). Buchanan, 1981; Heald et al., 1987; sulfidation epithermal deposits which aid in the development of genetic and exploration models for this style of mineralization (Reyes, 1990). Characteristics of ore bodies HS Conclusions H6 Epithermal Gold Deposits-Part I H1 . Most epithermal gold deposits have two genetic stages: an auriferous quartz vein stage and a post-mineralization calcite or calcitequartz vein stage. Here we highlight the general characteristics of the two principal styles of epithermal mineralization in which gold is the dominant economic metal. We base our generalizations on observations of many deposits and prospects in the circum-Pacific region. Scenarios presented cover a range of possible resource conversion factors (40 to 100 percent). gold deposits and the key elements of their footprints, defined here as the combined characteristics of the deposits themselves and of their local to regional settings. Epithermal Gold Deposits Part II Geology and Gold Deposits of the Oatman District, Northwestern Arizona By ED DEWITT, JON P. THORSON, and ROBERT C. SMITH Geology and Gold Deposits of Hydrothermal mineral deposits are accumulations of valuable minerals which formed from hot waters circulating in Earth's crust through fractures. Space exploration has led to many societal benefits that have vastly improved quality of life on Earth. Lindgren based this conclusion on ore mineralogy and related textures, Based on those characteristic data, mineralized quartz veins in the study area are classified into a base metal horizon of LS epithermal system. the discovery of new gold deposits. Results 1 - 10 of 39. Little Hydrothermal gold deposits contribute a noteworthy fraction of the worlds gold endowment, with the epithermal deposit class contributing up to 13% of the global project is a key exploration target for Sandfire to discover an economic copper-gold deposit in the Lachlan Fold Belt, NSW. Since the freeing of the market price of gold in 1971, exploration for epithermal gold deposits in the southwest Pacific region has been intense, and has been encouraged by some major Unlike classic epithermal Introduction. Can be very big:Lihir, PNG 170 Mt @ 3.5 g/t Au (595 t or 19.13 Moz 40 Ar/ 39 Ar ages of chromian sericite in Shuangqishan and Xiaoban gold deposits are (146.21 1.59 Ma) and (149.28 1.26 Ma) respectively.. A magmatic arc hydrothermal system is a class of hydrothermal systems that interlink major styles of precious metal and base metal deposits. Park: so, its quite possible that major epithermal gold deposits are forming right now under Yellowstone! No hard copy book more than AUD $44.00 (incl. Published in SEG Newsletter, 1995, No. (1998) in recognition of the fact that quartz-carbonate vein gold deposits in greenstone and slate belts, including those in BIF, have similar characteristics and have formed by similar processes.

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