scholarly journals Determination of Abrasiveness in Copper-Gold Sulfide Ores: A Contribution to the Geometallurgical Model of the Sossego Deposit

Minerals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1427
Author(s):  
Petterson de Azevedo Barbosa ◽  
Maurício Guimarães Bergerman ◽  
Elisabeth da Fonseca ◽  
Rogerio Kwitko-Ribeiro
Keyword(s):  
Mining Industry ◽  
Shear Zones ◽  
Sampling Protocol ◽  
Rock Drill ◽  
Copper Gold ◽  
Laboratoire Central ◽  
Iocg Deposit ◽  
Granite Rocks ◽  
Gold Sulfide

The geological context of this study is established in the iron oxide-copper-gold (IOCG) deposit of Sossego (Canaã dos Carajás, Brazil), where hydrothermal alterations in shear zones concentrated the metals of interest and added new characteristics to the metavolcanic-sedimentary and granite rocks. The mineral transformation of rocks by hypersaline fluids enriched in metals and silica also modifies some metallurgical properties, such as abrasiveness. Special bench tests on rock drill cores are used in mapping the abrasiveness of rocks, with the Bond abrasion test being more commonly used in the mining industry, but it has a restrictive sampling protocol and mass requirement for geometallurgical studies. As a counterpoint, the test of the Laboratoire Central des Ponts et Chaussées/Central Laboratory of Bridges and Roads (LCPC) requires a smaller amount of fine material and a finer granulometric range. The study on the use of LCPC was implemented in 40 samples, using Bond Ai as a reference. The results showed a strong correlation between both methodologies (R2 = 95%), validating the use of LCPC to quantify abrasiveness in the Sossego mine. It was also possible to classify the most abrasive lithologies.

scholarly journals Comparative Analysis of Gearboxes Wear in Excavators and Mining Trucks

2020 ◽  
Vol 174 ◽  
pp. 03017
Author(s):  
Andrey Kudrevatykh ◽  
Andrey Ashcheulov ◽  
Alena Ashcheulova ◽  
Kumis Urazbaeva
Keyword(s):  
Comparative Analysis ◽  
Mining Industry ◽  
Technical Condition ◽  
Used Oil ◽  
Dump Trucks ◽  
Wear Products ◽  
High Level ◽  
Physical And Chemical ◽  
Metallic Impurities

The primary task of all enterprises in mining industry is to increase the durability and reliability of the mining complex. These very indicators provide nonstop minerals mining, and as a result, productivity increases. Indicators maintaining at high level can be achieved by different ways, but the most effective method is repair-in-place diagnosis of the actual technical condition of the main units and assemblies of equipment, as it is less costly and the most informative. To identify gear malfunctions, the physical and chemical analysis of the used oil is used to determine metallic impurities. A comparative analysis of wear products accumulation in rotary gears of mining excavators and gearboxes of the motor-wheel of dump trucks revealed the similarity of mathematical models for the determination of metallic impurities in used oil. The “universal” mathematical model is given in the paper; it allows to determine the actual technical condition of gearboxes for various equipment with a few assumptions. Moreover, the model takes into account various indicators of the environment, used oil, as well as the operating parameters of the equipment.

scholarly journals Development of a three-parameter model of the shoe brake contact interaction with the drum in mine hoisting machine

2018 ◽  
Vol 60 ◽  
pp. 00039
Author(s):  
Kostiantyn Zabolotnyi ◽  
Oleksand Zhupiiev ◽  
Artur Molodchenko
Keyword(s):  
Contact Interaction ◽  
Accurate Determination ◽  
Mining Industry ◽  
Flexural Stiffness ◽  
Safe Operation ◽  
Translational Movement ◽  
Longitudinal Stiffness ◽  
The Coefficient Of Friction ◽  
Maximum Contact

For safe operation of mine hoisting machines (MHM) in the mining industry, it is necessary to provide high constructive reliability of brake systems, in particular, brake systems based on the block brake. The contact interaction of the brake with the translational movement of the shoes applied in MHM, remains insufficiently studied. In particular, it is necessary to develop a technique for accurate determination of the braking moment and forces in the elements of the brake linkage, as well as to study the nature of the pressure distribution along the brake beam. The purpose of this article is to simulate the contact interaction of the MHM brake taking into account the coefficient of friction, the ratio of the flexural stiffness to the longitudinal stiffness of a beam, as well as the ratio of the transverse stiffness of a lining to the flexural stiffness of a beam. The application of the developed model will help to reduce the maximum contact pressure in the shoe brakes of the mine hoisting machines and will allow more accurate calculation of the braking moment value compared to existing methods.

scholarly journals Determination of the transfer step of the ore chute while mining the technogenic deposit of the bulk type

2020 ◽  
Vol 166 ◽  
pp. 02004
Author(s):  
Volodymyr Peregudov ◽  
Ihor Hryhoriev ◽  
Serhii Joukov ◽  
Yulian Hryhoriev
Keyword(s):  
Raw Materials ◽  
Mining Industry ◽  
Process Conditions ◽  
Geological Conditions ◽  
Scientific Task ◽  
Technogenic Deposit ◽  
Mining Works ◽  
The Cost

Further development of the open mining works on the domestic enterprises will be accompanied by the worsening of mining-geological conditions and declining of the quality of iron ore raw materials. In the same time, the accumulated mining wastes, that can make the technogenic deposits, pass into one of the important sources of the mineral raw materials. Taking into account this thing, the development and implementation of the modern technological circuits of the technogenic deposit development is an actual calling for mining industry, and determination and optimization of process conditions of the technogenic deposit development – is the scientific task of this publication. The obtained results of studies of the optimum step value of the ore chute transfer during the technogenic deposit development can be used by design organizations and mining enterprises for designing works. The obtained methodology and the proposed mathematical dependencies will reduce the cost of mining of the technogenic deposit due to the reasonable timely transfer of the open ore chute.

Fluorite as indicator mineral in iron oxide-copper-gold systems: explaining the IOCG deposit diversity

2020 ◽  
Vol 548 ◽  
pp. 119674
Author(s):  
Tobias U. Schlegel ◽  
Thomas Wagner ◽  
Tobias Fusswinkel
Keyword(s):  
Iron Oxide ◽  
Copper Gold ◽  
Iocg Deposit ◽  
Indicator Mineral

Allanites in the Sin Quyen IOCG deposit, North Vietnam

2020 ◽  
Author(s):  
Chau Nguyen Dinh ◽  
Jadwiga Pieczonka ◽  
Adam Piestrzynski ◽  
Phon Le Khanh ◽  
Hao Duong Van
Keyword(s):  
Optical Properties ◽  
Statistical Analysis ◽  
Iron Oxide ◽  
Chemical Composition ◽  
Major Elements ◽  
Copper Gold ◽  
Crystallization Solution ◽  
Iocg Deposit ◽  
North Vietnam ◽  
Crystallization Stage

Abstract: Allanite minerals are the principal host of REEs in the Sin Quyen, Iron Oxide Copper Gold (IOCG) type deposit. The geochemical characteristics of these minerals are discussed in this work. The studied allanites have an unstable concentration of all major elements, such as REE (14-27 wt%), Ca (9-16 wt%), Al (8-19 wt%), Si (26-34 wt%) and Fe (12-21 wt%). Two different varieties of these minerals are documented, the older with higher REE concentrations ranging from 20 to 27 wt%, and younger with lower total REE concentration ranging from 14 to 19 wt%, which occur as a rim surrounding the older. Differences between the two groups of allanites are documented by Raman spectra and optical properties. The WDS chemical composition indicate that the allanites belong to the Ce-La-ferriallanite family, with low ƩHREE with an average of 0.21 wt.%. This work also supports the estimated timing of the deposit development focusing on detailed petrological study, and documented chemical composition of allanites confirmed by simplified statistical analysis. Temperature 355ºC which was calculated using value of δ34S isotopes is interpreted as a temperature of the second crystallization stage of allanite group. The pressure of crystallization solution was calculated and is ranging from 0.98 to 5.88 MPa.

Chronoamperometric Determination of Solid State Diffusion Coefficients in Copper-Gold Alloys Using a Molten Salt Electrolyte

1983 ◽  
Vol 38 (2) ◽  
pp. 106-115 ◽  
Author(s):  
F. Lantelme ◽  
M. Chemla
Keyword(s):  
Mathematical Treatment ◽  
Current Response ◽  
State Diffusion ◽  
Copper Gold ◽  
Constant Potential ◽  
Electrode Interface ◽  
Molten Salt Electrolyte ◽  
Intermetallic Diffusion ◽  
Short Times

Abstract The intermetallic diffusion coefficient in Cu-Au alloy between 400 °C and 550 °C is measured by chronoamperometry using a Cu-Au electrode in a molten LiCl-KCl electrolyte containing small amounts of Cu+ ions. The current response to a defined constant potential step is controlled by the rate of diffusion in the alloy electrode. The mathematical treatment developed by introducing the Boltzman transformation shows that the current density is a linear function of the reciprocal square root of time whatever the dependence of D versus concentration is. The method is applied to cathodic as well as anodic potential pulses which correspond to surface alloying or dissolution i.e. diffusion "in" or "out" the sample. The shift of the interface due to the copper deposition or dissolution is considered according to the Oldham and Raleigh's method. By studying the electrochemical response at very short times the diffusion can be examined in the first atomic layers of the electrode interface.

scholarly journals Determination of the k-Values of Copper-Gold Alloys with ED- and WD-EPMA - Results of an Inter-Laboratory Comparison

2014 ◽  
Vol 20 (S3) ◽  
pp. 730-731 ◽  
Author(s):  
Vasile-Dan Hodoroaba ◽  
Ryna B. Marinenko ◽  
Vanessa Rackwitz ◽  
Wolfram Bremser ◽  
Wolfgang E. S. Unger
Keyword(s):  
Gold Alloys ◽  
Copper Gold
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