Grade Control In Vein Type Gold Deposits

  • Gold in Quartz - ICMJ's Prospecting and Mining Journal

    While gold deposits can be things besides quartz veins, gold is certainly found in the quartz of veins cutting through various types of rocks. Gold in quartz veins occurs as particles and scales scattered through the quartz, often filling cracks and openings in the vein material. The gold can be such small particles as to be invisible to the ...

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  • IKE Copper-Molybdenum-Silver Porphyry Deposit ...

    nificant amounts of early halo-type (EHT) veins are found throughout the deposit; such veins are typically associated with deep-seated porphyry deposits, such as Butte, Montana and Ann Mason, Nevada. This project is an investigation of the geochemical proper-ties of these early halo-type veins and how they relate to mineralization.

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  • (PDF) Grab sampling for underground gold mine grade control

    J.B. Grade control in underground gold vein operations: the role of ... is related to mining method and orebody type. Sampling protocols must be designed to …

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  • Effective Domain Selection for Grade Control in Narrow ...

    Aug 18, 2014· Effective domain selection for grade control in narrow vein gold deposits, in Proceedings Ninth International Mining Geology Conference 2014 , pp 191–196 (The Australasian Institute of Mining and Metallurgy: Melbourne). Full Article Download: (6614 kb) OneMine, Inc. [email protected] +1 303 948 4248 Fax ...

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  • Major Mines & Projects - Mining Intelligence and News

    Turbidite-hosted Meguma gold deposits are a sub-type of orogenic gold deposits. Orogenic gold deposits form near or soon after peak metamorphism in collisional metamorphic terranes of all ages. These deposits exhibit strong structural control in brittle faults and ductile shear zones as quartz-dominated stockworks, breccias, sheeted veins, vein ...

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  • Epithermal Gold and Silver in Newfoundland and Labrador

    … can be extremely high-grade, containing gold values ranging from 10 to more than 200 g/t (grams per tonne); the higher grades are called “bonanza grades” for obvious reasons (Figure 2). Goldbanks, Nevada, e.g. has high-grade banded veins with gold grades which range up to ~ 8 oz. Au/t (~ 270 g/T). … are commonly found as small

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  • Grade control geological mapping in underground gold vein ...

    T1 - Grade control geological mapping in underground gold vein operations. AU - Dominy, S. C. AU - Platten, I. M. PY - 2012. Y1 - 2012. N2 - Grade control is a process of maximising value and reducing risk. It requires the delivery of tonnes at an optimum grade to …

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  • Geochemistry of hydrothermal gold deposits: A review ...

    Jul 01, 2011· Simultaneous entrapment of aqueous and carbonic inclusions in auriferous laminated quartz veins in different gold deposits (e.g., Zhu et al., 2001, Pal and Mishra, 2002) was due to unmixing of an initial H 2 O–CO 2 fluid at lower temperature. Accordingly, gold precipitation was primarily due to a decrease in S in the aqueous part, a ...

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  • How to Identify a Gold Bearing Area | Sciencing

    Apr 25, 2017· Gold is mainly found in two types of deposits: lode (hard rock veins) and placer (surface). Locating the richest gold bearing areas primarily involves research, planning, dedication and funds. In other words, those who study geological surveys, land formations, rock structures and gold prospecting history prior to prospecting may have a better ...

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  • Vein and Greisen Sn-W Deposits - ProExMin - Prospecting ...

    Deposits that consists of several veins or stockworks may contain millions to tens of millions of tonnes. In vein deposits typical grades are in the range from 0.5-2.5 % Sn, and/or 0.3-1.8 % WO 3. Sn greisen deposits are generally larger than Sn-W vein deposits and range from about 0.8 to dozens of millions of tonnes containing 0.2-0.5 % Sn.

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  • Grab sampling for underground gold J mine grade control

    Grab sampling for underground gold mine grade control by S.C. Dominy*† Synopsis 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

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  • How Is Gold Formed and Where Does it Come From?

    May 18, 2015· At different times in the earth’s history, hot fluids circulated through gold-bearing rocks and because of the weight and chemical properties of the gold, the gold may have been carried off to form a vein or a lode. In other instances, gold flakes and nuggets broke off and were carried away by water’s currents.

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  • Minerals | Free Full-Text | Emerald Deposits: A Review and ...

    Type II deposits are subdivided into schist without pegmatite and black shale with veins and breccia. However, a number of emerald deposits of type I have been influenced by syntectonic events (e.g., Carnaíba, Brazil; Poona, Australia; Sandawana, Zimbabwe) or remain unclassified, such as the Gravelotte (Leydsdorp) deposit in South Africa .

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  • 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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  • Gold Prospecting | How to Find Gold in the United States

    The Many Rewards of Finding Gold. Anyone who pans for gold hopes to be rewarded by the glitter of colors in the fine material collected in the bottom of the pan. Although the exercise and outdoor activity experienced in prospecting are rewarding, there are few thrills comparable to finding gold.Even an assay report showing an appreciable content of gold in a sample obtained from a lode deposit ...

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  • VEIN DEPOSITS - Earth Science

    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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  • How does Gold Naturally Form on Earth's Crust - Veins

    These veins are often microscopic, but sometimes they are quite significant high grade deposits that can be mined profitably. Why is Gold only Found in Certain Areas? These processes mentioned above tend to occur in areas with natural faults that move the earth’s crust.

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  • Very High Grade Gold, Platinum, Palladium & Silver Deposit ...

    Oct 28, 2018· Seven high grade exposures of mineral deposits in outcrop/subcrop. Very high grade gold, platinum, palladium and silver veins!We sent in 3 samples for assays...

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  • Epithermal Gold for Explorationists | AIG Journal

    Bonanza gold grade epithermal quartz gold-silver style mineralization comprising gold fill of an open quartz vein, Edie Creek. An extremely efficient mechanism of gold deposition is required to remove gold from solution and form bonanza grade gold deposits.

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  • Placer Gold vs. Lode Gold (and how to find it!)

    The origin of that gold is usually from a vein up on the mountain. Creation of a Placer Gold Deposit Here is an example. Through geologic processes millions and millions of years ago, a gold vein forms in some type of rock. This vein is 10,000 feet up on a mountain and 20 feet under the ground. As time goes by natural erosion takes place.

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

    These are crystals of Calaverite - a 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 …

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  • 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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  • Orogenic gold deposits: A proposed classification in the ...

    Apr 01, 1998· The so-called `mesothermal' gold deposits occupy a consistent spatial/temporal position (), having formed during deformational processes at convergent plate margins (orogeny) irrespective of whether they are hosted in Archaean or Proterozic greenstone belts or Proterozoic and Phanerozoic sedimentary rock sequences (e.g. Barley and Groves, 1992; Kerrich and Cassidy, 1994).

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  • Grade control geological mapping in underground gold vein ...

    Dec 13, 2017· Gold veins show features relating to erratic grade distribution (nugget effect), and variable geometry and internal architecture. These features …

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  • Gold Deposit Classification: List of 10 Types of Gold Deposits

    Metallurgical ContentGold Deposit Class #1Gold Deposit Class #2Gold Deposit Class #3Gold Deposit Class #4Gold Deposit Class #5Gold Deposit Class #6Gold Deposit Class #7Gold Deposit Class #8Gold Deposit Class #9Gold “Deposit” Class #10 Gold/Auriferous Deposits can be classified into types for which here is a List of 10 Types of Gold Deposits: Auriferous …

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  • Geological Modelling and Grade Control in a Narrow Vein ...

    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. The processes used to model the resource and to control ore drive development have evolved since mining...

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  • Gold in Colorado: Gold Deposits of Colorado

    Minor gangue mineralization consists various occurrences of quartz, fluorite, and carbonate. The majority of the historical production came from these high-grade gold-silver telluride vein portions of the deposit. There are two late-stage, prominent hydrothermal breccia pipes in the northwest corner of the district.

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  • Polymettalic Veins Silver Lead Zinc & Gold - Mineral ...

    OTHER EXPLORATION GUIDES: Strong structural control on veins and common occurrence of deposits in clusters can be used to locate new veins. ECONOMIC FACTORS TYPICAL GRADE AND TONNAGE : Individual vein systems range from several hundred to several million tonnes grading from 5 to 1500 g/t Ag, 0.5 to 20% Pb and 0.5 to 8% Zn.

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  • (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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  • What Does the Grade of a Gold Mine Refer To?

    Feb 07, 2020· Gold mines and gold deposits are often categorized by the average proportion of gold contained in the ore at the site. This is also known as the ore grade.  …

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  • Veins and Hydrothermal Deposits - Geology In

    Vein deposits of this nature are a type of hydrothermal deposit because the mineral species which compose the veins were precipitated by hot waters. However, sometimes the preexisting rock wall which contains the vein undergoes alteration. Portions of the host rock may either dissolve and be transported away or else react chemically with the circulating volatile fluids or …

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  • AU-AG-TE VEIN DEPOSITS (MODEL 22b; Cox and Bagby, …

    Vein deposits are usually high-grade but may be small and erratically distributed. Nearly all gold production from these deposits is from gold- and gold-silver telluride minerals. Base metals are infrequently present and are volumetrically minor. Most veins are structurally-controlled. Some structural zones display extensive vertical

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  • Vein Formation and Deformation in Greenstone Gold Deposits ...

    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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