grade control in vein type gold deposits

  • Cobalt—Styles of Deposits and the Search for Primary

    Cobalt—Styles of Deposits and the Search for Primary

    It is also variably present in Besshi-type volcanogenic massive sulfide and siliciclastic sedimentary rock-hosted deposits in back arc and rift environments associated with mafic-ultramafic rocks. Metasedimentary cobalt-copper-gold deposits (such as Blackbird, Idaho), iron oxide-copper-gold deposits, and the five-element vein deposits (such

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  • Intrusion Related Gold Deposits

    Intrusion Related Gold Deposits

    Mining and treatment • Disseminated styles, greisens and skarns usually best suited to open pit mining or selective underground mining. Veins can be selectively mined underground. • Ore grades are typically low but are usually metallurgically simple and sulfide-poor, being low in Cu and other base metals.

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  • Grab sampling for underground gold mine grade control

    Grab sampling for underground gold mine grade control

    Grab sampling for underground gold mine grade control S.C. DOMINY Snowden Mining Industry Consultants Limited, Weybridge, England and University of Ballarat, Mount Helen, Australia Geologists in some underground gold mines collect grab samples from broken ore piles or trucks as a method of grade control. It is often known as muck sampling.

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  • Epithermal Gold Deposits  their characteristics & modeling

    Epithermal Gold Deposits their characteristics & modeling

    Epithermal Gold Deposits their characteristics & modeling Grade and Tonnage relationship in gold deposits (a) Paleoplacer Deposits (b) Lode gold deposits (c) Epithermal vein type deposits (d) Sediment hosted deposits, (e) Hot spring deposits and (f) Porphyry deposits

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  • Vein (geology)Wikipedia

    Vein (geology)Wikipedia

    In many gold mines exploited during the gold rushes of the 19th century, vein material alone was typically sought as ore material. In most of today's mines, ore material is primarily composed of the veins and some component of the wall rocks which surrounds the veins.. The difference between 19th-century and 21st-century mining techniques and the type of ore sought is based on the grade of

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  • FG Gold — Kore Mining

    FG Gold — Kore Mining

    Many of the most productive ore bodies of this type exceed one kilometer in vertical extent with little change in gold grade with depth (Goldfarb et al, 1986). There is a spatial association of this type of gold deposit with greenschist grade of metamorphism, possibly due to the large fluid volume required during the amphibolite and/or

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  • PORPHYRY DEPOSITSEarth science

    PORPHYRY DEPOSITSEarth science

    Gold is often in native found as tiny blobs along borders of sulphide crystals. Most of the su1phides occur in veins or plastered on fractures most are intergrown with quartz or sericite. In many cases, the deposits have a central very low grade zone enclosed by 'shells' dominated by . bornite, then chalcopyrite, and

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  • Ultra High Grade Gold Vein In A Heavily Mineralized

    Ultra High Grade Gold Vein In A Heavily Mineralized

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    Nov 21, 2018 · An ultra high grade gold vein found in a heavily mineralized outcrop! Solid mineral vein panned out to reveal high grade gold, platinum, palladium, silver and other minerals! Vein contains

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  • Grade control geological mapping in underground gold vein

    Grade control geological mapping in underground gold vein

    The foundation of all grade control programmes should be that of geological understanding led by clear and accurate mapping and representative sampling to drive appropriate estimation strategies and mining. Gold veins show features relating to erratic grade distribution (nugget effect), and variable geometry and internal architecture.

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  • Improved Grade Estimation Using Optimal Dynamic

    Improved Grade Estimation Using Optimal Dynamic

    Improved Grade Estimation using Optimal Dynamic Anisotropy Resolution S.Mandava* Grades in gold vein deposits are characterised by a highly positively skewed distribution in which a small any one Witwatersrand-type gold mine, the entire seam is mined and estimation of the grade is therefore

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  • The conjunction of factors that lead to formation of giant

    The conjunction of factors that lead to formation of giant

    Ore grade in g/t gold versus metric tonnes of ore for giant deposits belonging to the orogenic, Carlin-type, IOCG and IRGD gold deposit groups. For IOCG deposits, grade is shown as g/t gold-equivalent, which utilizes current gold and copper prices to calculate copper value as gold equivalent value.

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  • Geology of Gold Mineralization & How Gold Deposits are Formed

    Geology of Gold Mineralization & How Gold Deposits are Formed

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  • Eight Natural Geologic Signs Pointing Toward Gold

    Eight Natural Geologic Signs Pointing Toward Gold

    The problem is that gold occurs in many types of deposits, and what indicators work great for one type of deposit don't always work well for another. As an example, in some places the presence of vein quartz on the ground is a valuable indicator, yet I have been in places where there is so much vein quartz everywhere that is worthless as an

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  • Structures of Mineral Deposits

    Structures of Mineral Deposits

    Deposits are formed in the epicrustal volcanic environment and constitute a principal source of copper-gold-molybdenum. Shallow porphyry intrusives, stockworks and breccia systems form large tonnage (up to several billion tons) low-grade deposits amenable to low-cost bulk mining and treatment.

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  • Greenstone-hosted quartz-carbonate vein deposits

    Greenstone-hosted quartz-carbonate vein deposits

    The greenstone-hosted quartz-carbonate vein deposits correspond to structurally controlled complex epigenetic deposits characterized by simple to complex networks of gold-bearing, laminated quartz

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  • Photos of gold ores, quartz, telluride gold ore and gold

    Photos of gold ores, quartz, telluride gold ore and gold

    These are crystals of Calaveritea gold, silver and tellurium mineral. This is very high grade gold ore from the Cripple Creek district in Colorado. Many old time miners mistook this type of mineral for low grade sulfides, but this silvery metallic material probably is 40 percent gold by weight.

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  • High Grade Gold Left In Old Mines & Finding Loads Of Vuggy

    High Grade Gold Left In Old Mines & Finding Loads Of Vuggy

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    Jul 16, 2018 · High grade gold from mineralized samples taken at a couple gold mines on our mineral property and finding loads of vuggy quartz veins all over the claim. Our goal this trip was to mainly search

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  • Geology of Gold Mineralization & How Gold Deposits are Formed

    Geology of Gold Mineralization & How Gold Deposits are Formed

    In the past, low-grade disseminated gold deposits have become increasingly important. More than 75 such deposits have been found in the Western States, mostly in Nevada. The first major producer of this type was the Carlin deposit, which was discovered in 1962 and started production in 1965.

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  • A porphyry Cu-Au modelexploration implications

    A porphyry Cu-Au modelexploration implications

    Corbett and Menzies Consulting cmcgeos Agenda ♦ Localisation of porphyry Cu-Au deposits (PCD) ♦ Factors that contribute to the high Cu-Au grades in porphyry deposits and metal zonations ♦ Stage model for the evolution of porphyry Cu-Au deposits incorporating time. ♦ Field based vectors used to explore for porphyry Cu-Au deposits.

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  • Lithological and spatial controls on the distribution of

    Lithological and spatial controls on the distribution of

    Vein distributions in line samples from four epithermal Au–Ag deposits of the Hauraki Goldfield were logged and quantified by vein spacing, vein density, vein thickness and percentage of vein extension. One deposit is hosted in andesite lavas (Martha Hill), one in andesite lavas and dacite porphyry, dacitic tuffs and pyroclastic breccias (Golden Cross), and two in rhyolite lavas and

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  • Epithermal Gold for Explorationists AIG Journal

    Epithermal Gold for Explorationists AIG Journal

    Epithermal Gold for Explorationists. Greg Corbett, Consultant Geologist An extremely efficient mechanism of gold deposition is required to remove gold from solution and form bonanza grade gold deposits. Good core recoveries are important as the loss of softer ginguro and clay material could downgrade the gold grade and vein thickness.

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  • VOLCANIC-ASSOCIATED MASSIVE SULFIDE DEPOSITS

    VOLCANIC-ASSOCIATED MASSIVE SULFIDE DEPOSITS

    of new deposits in frontier areas likely requires at least 10 million tonnes of reasonably high grade ore. Most Cyprus-type deposits contain less than 15 million tonnes of ore. Most Besshi-type deposits are also fairly small notable exceptions include the >300 million tonne Windy Craggy, British Columbia, deposit. Kuroko-type deposits,

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  • Carlin–type gold depositWikipedia

    Carlin–type gold depositWikipedia

    The invisible nature of the gold in the deposit makes it difficult to find deposits of that kind. The class of deposit was defined after the Carlin mine became a mass producer of gold in the 1960s and it was recognized that other deposits of that type should exist. Most of the mines in the Great Basin in the United States belong to the Carlin type

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

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

    Ag deposits are categorised as a number of styles, linked on an overall anatomy, which display considerable variation in metal grade, size, form and metallurgy, typically governed by setting and crustal level of formation, as well as controls to vein formation such as host rock competency, structure, and mechanism of Au deposition.

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  • Challenges in maximising the value from epithermal gold

    Challenges in maximising the value from epithermal gold

    The characteristics of epithermal gold deposits include being highly variable with respect to geometry and gold grade distribution, the presence of other economic contributors, mineralogy, texture, rock strength, weathering and alteration overprint. These characteristics influence the economic value of mining projects in an interlinked manner.

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

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

    Ag deposits are categorised as a number of styles, linked on an overall anatomy, which display considerable variation in metal grade, size, form and metallurgy, typically governed by setting and crustal level of formation, as well as controls to vein formation such as host rock competency, structure, and mechanism of Au deposition.

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  • Sampling 101 QUALITY ASSURANCE/QUALITY CONTROL (QA/QC

    Sampling 101 QUALITY ASSURANCE/QUALITY CONTROL (QA/QC

    After a few high profile mining/exploration scams the Canadian government, and many others have followed suit, demand a higher caliber and standards for reporting sample data.This falls under what is known as NI 43-101 whereby a qualified geoscientist (Professional Geoscientist) must review all aspects of the sampling procedures for accuracy and potential issues.

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  • 2.7 Orogenic mineral system Geoscience Australia

    2.7 Orogenic mineral system Geoscience Australia

    All four processes probably happen in lode gold systems, but fluid mixing is the main depositional mechanism in Cobar-type deposits. In addition to Au, lode gold deposits typically are anomalous in Ag, As, Ba, oxidised C, K, Rb, S, Sb, Si, Te and W (Eilu and

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  • OreWikipedia

    OreWikipedia

    Ore is natural rock or sediment that contains desirable minerals, typically metals, that can be extracted from it. Ore is extracted from the earth through mining and refined, often via smelting, to extract the valuable element or elements.. The grade of ore refers to the concentration of the desired material it contains. The value of the metal an ore contains must be weighed against the cost

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  • Orebody Modeling and Resource Estimation

    Orebody Modeling and Resource Estimation

    and grade(s) in each block. The shape of blocks and the estimation method vary with the type of deposit being modeled. In vein-type deposits recognized by drill holes on cross-sections at regular intervals, we typically do a conventional sectional modeling with user-defined and irregular blocks around each mineralized intercept on the sections.

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  • Orogenic gold deposits A proposed classification in the

    Orogenic gold deposits A proposed classification in the

    On the basis of this broad depth range of formation, the term `mesothermal' is not applicable to this deposit type as a whole. Instead, the unique temporal and spatial association of this deposit type with orogeny means that the vein systems are best termed orogenic gold deposits.

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  • Intrusion Related Gold Deposits

    Intrusion Related Gold Deposits

    Mining and treatment • Disseminated styles, greisens and skarns usually best suited to open pit mining or selective underground mining. Veins can be selectively mined underground. • Ore grades are typically low but are usually metallurgically simple and sulfide-poor, being low in Cu and other base metals.

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