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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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  • Geological Modelling and Grade Control in a Narrow Vein

    Geological Modelling and Grade Control in a Narrow Vein

    Geological Modelling and Grade Control in a Narrow Vein, High-Grade Gold Mine. The Vera Nancy orebodies, although simple in overall geometry, are in detail generally narrow, multi-veined and fluctuating in width, strike and dip. Tight geological control is required to optimise gold and silver production from this bench stoping operation.

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  • Deposit scale structural controls on orogenic gold

    Deposit scale structural controls on orogenic gold

    Aug 13, 2019 The first attempts to propose a process model for the localisation of high-grade ore shoots in vein-style gold deposits date back to the early twentieth century (e.g. Hulin 1929).For example, in the case of gold-bearing reefs at Norseman, Western Australia, reefs, which were hosted by moderate flat-dipping reverse faults, a systematic relationship was observed between many ore …

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  • Large Gold Deposit Types ICMJs Prospecting and Mining

    Large Gold Deposit Types ICMJs Prospecting and Mining

    Orogenic Type Gold Deposits. ... Both low-grade disseminated and structurally controlled high-grade vein type deposits can form, such as at Round Mountain and the Comstock Lode in Nevada. In fact, Nevada is famous for its many LS epithermal deposits. ... such as fault control, comb and banded veins, vuggy textures, and wall rock alteration.

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  • Vein Formation and Deformation in Greenstone Gold Deposits

    Vein Formation and Deformation in Greenstone Gold Deposits

    Jan 01, 2001 The confident determination of the structural timing of veins in deposits is critical but challenging, and is at the center of divergences of interpretation of the origin of many greenstone gold deposits. A number of guidelines are offered to help distinguish pre-orogenic veins and deposits from those with syn- to postorogenic timing.

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  • Gold Deposits and Their Geological Classification

    Gold Deposits and Their Geological Classification

    Robert, F., Poulsen, K.H., and Dub , B. G OLD DEPOSITS AND THEIR GEOLOGICAL CLASSIFICATION 211 Table 1: Commonly recognized types of lode gold deposits and their main geological attributes (cont’d.) Deposit Type Associated Alteration Metal Association Size & Grade of Deposits Selected References

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  • Low Sulfide Quartz Gold Model USGS

    Low Sulfide Quartz Gold Model USGS

    Low-Sulfide Quartz Gold Deposit Model By Lawrence J. Drew U.S. Geological Survey Reston, VA 20192 Deposits in this class have been widely described and given many names: • Mesothermal gold • Mother lode type • Homestake type • Low-sulfide quartz gold • Gold-only deposits • Quartz-carbonate lode gold

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  • Grade Control SpringerLink

    Grade Control SpringerLink

    Abstract. In some mining operations, one of the most important roles played by the geologist is the supervision of grade control. In an open-pit operation, this involves the sampling of blast-hole cuttings produced by down-the-hole hammer drills and the classification of bench reserves into ore, low grade or waste material, or into various metallurgical types.

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  • Clues from soured milk reveal how gold veins form

    Clues from soured milk reveal how gold veins form

    May 21, 2021 This jelly gets trapped in the cracks of rocks to form the ultra high-grade gold veins. The gold colloids are distinctively red and can be made in the lab, whereas solutions of dissolved gold are ...

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  • Ore Loss and Dilution A Mine Engineering Study

    Ore Loss and Dilution A Mine Engineering Study

    Jul 01, 2018 For example, in high grade, nuggety, vein-type deposits, mill recoveries are typically over-predicted while the stockpile recoveries are under-predicted. In such deposits, it …

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  • Effective Domain Selection for Grade Control in Narrow

    Effective Domain Selection for Grade Control in Narrow

    Effective Domain Selection for Grade Control in Narrow Vein Gold Deposits. Effective domaining is fundamental to geostatistical modelling for grade control. Through analysis of lithological, structural and alteration logging data, effective groupings (domains) can be identified and employed for estimation or simulation purposes.The poor definition of domains can adversely affect the grade control model …

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  • VEIN DEPOSITS Earth Sci

    VEIN DEPOSITS Earth Sci

    A high-grade deposit could have gold values ranging from 10 to more than 150 grams per tonne, whereas a low-grade deposit grades in the range of 1 to 5 grams. Low-grade deposits may have up to, and possibly more than, 200 million tonnes of rock, whereas a high-grade deposit is frequently smaller.

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  • PDF Resource evaluation of narrow gold bearing veins

    PDF Resource evaluation of narrow gold bearing veins

    Grade-control activities provide an important framework in which to develop geological understanding of the deposit: the critical feature of narrow gold veins is their strong geological controls ...

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  • Structural geometry of orogenic gold deposits

    Structural geometry of orogenic gold deposits

    Jul 01, 2018 The genesis of vein-type to disseminated gold deposits, broadly classified as orogenic gold deposits (Groves et al., 1998, Goldfarb et al., 2005) has remained controversial. The genetic models for these deposits were evaluated in a recent review by Goldfarb and Groves (2015). Much attention has been focused on the source of auriferous fluids.

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  • Grab sampling for underground gold J mine grade control

    Grab sampling for underground gold J mine grade control

    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. Generally, the goal of grab sampling is to try and reconcile the mined grade at the ore source to the predicted grade and/or predict the mill feed grade.

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  • Epithermal Gold Deposits their characteristics amp modeling

    Epithermal Gold Deposits their characteristics amp 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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