identified and implemented include more stringent operating procedures and equipment upgrades. The result has been an increase in the accuracy and precision of the measurement being taken for gold accounting and allocation to the separate business units. Keywords: plant sampling, chronostatistics, Macraes, gold, accuracy, precision. Introduction
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PDF | On Jan 1, 2000, K.S. Smith and others published Sampling Strategy for the Rapid Screening of Mine-Waste Dumps on Abandoned Mine Lands. ICARD 2000. 5th International Conference on Acid Rock ...
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Gold-mining residues typically fall into one of three categories comprising slime (particle size of about 75% passing 74 μm), sand (about 10–20% passing 74 μm) and waste rock.Since the slime and sand has been previously processed, it typically has a low gold grade (<1.0 g/t) and will provide relatively low recovery efficiencies, in the order of 50%.
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This study reports the fractionation of trace metals such as As, Bi, Cd, Co, Cr, Cu, Mo, Ni, Pb, Sb, Se, Tl and Zn in soils collected from Struibult gold mine dump, Gauteng, South Africa using a modified three-step BCR sequential extraction procedure. The extractable fractions such as exchangeable, easily reducible and oxidizable fractions were used assessed to the …
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In placer mining, there are fundamentally two kinds of sampling: 1) Discovery: Attempting to locate a higher-grade deposit of value inside of a larger volume of lower-grade material. 2) Quantification: Extracting and analyzing smaller …
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Column leaching using cyanide solution to assess heap-leaching potential of gold bearing ores usually follows the following processes: Agglomeration testing. After sample preparation and crushing to the target crush size, samples destined for column testing will very often require agglomeration testing.
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Quality assurance and quality control. Quality assurance and quality control are the key components of a quality management system. 8–10 Quality assurance is the collation of all actions necessary to provide adequate …
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Alternative procedures for the recovery of gold from old sand dumps are discussed, with emphasis on the use of heap leaching. The modification of material to improve its permeability prior to heap leaching is not currently receiving much attention in South Africa. The channeling of solutions through heaps and the high consumption of reagents sometimes ascribed to heap leaching …
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first issue can be addressed though good sampling procedures and practice, and the second resolved through application of the Gy Equation for the variance of FSE (Gy, 1982; Pitard, 1993;
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Dump or grab sampling has been used globally as a grade control ... The errors 617 produced during the reduction procedure and the sample size can be assessed by the Gy's 618 theory of sampling ...
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known to contain less coarse gold than the high-grade shoots (30 g/t Au: ~60% of gold greater than 300 microns in size). In addition, stoping was via air leg methods which tend to yield a 'finer' rock fragment size range. The Pajingo mine (Queensland, Australia) applies grab sampling to determine the grade of surface truck dumps prior A J o ...
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Dominy – Importance of good sampling… 1 Importance of good sampling practice throughout the gold mine value chain S. C. 1,2Dominy* 1. Western Australian School of Mines, Curtin University ...
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Sampling Strategy for the Rapid Screening of Mine-Waste Dumps on Abandoned Mine Lands Kathleen S. Smith1, Charles A Ramsey2, and Philip L. Hageman3 1 U.S. Geological Survey, MS. 973, Denver Fede ...
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entrapped gold, and has made the gold available for direct recovery by leaching. A number of these old sand-tailings dumps are at pre-sent being retreated for the recovery of their contained gold. One of the major procedures used is milling of the coarse gold-bearing sand to …
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The Struibult Gold Mine dump is one of the examples of the gold mine dumps in the Eastrand of Johannesburg (Kamunda et al., 2016). Several studies have focused on the analysis of total metals in soil (Refs) rather than the speciation or chemical forms of metals in soil matrices ( Nemati et al., 2011 ; Wan et al., 2017 ).
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of nine months the price of gold increased to $35-00 per troy ounce which is its current price. The Increase in the price of gold in 1933 provided and still provides an incentive for the consideration of retreating tailing deposits contalnlrg Croston, J, J,* Effect of Revaluation on the Gold-Mining Industry. A.I.M.E. Trans,, vol. 126, 1937, p ...
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dumps On sand dumps the permeability of the sand js so great that rainwater can drain slowly down through the dump and flow out through low spots in the base, causing localised pollution problems. This is countered by im-pounding the seepage in paddocks as close to the dump as possible and al-lowing it to evaporate. Prevention of air pollution
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assay procedures (Ca rrasco, 2009; François-Bongarçon, 2004; Pitard, 2007). ... There are a number of peculiarities of sampling for gold, whi ch relate to both CSE and ISE.
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It is concluded that the gold allocation procedures that rely on go-belt sampling and rail weighing of ore from shafts has been successfully implemented, and that the system, which has been in operation at Harmony since 1993, has won general acceptance from stakeholders, with the gold allocations being perceived as being fair to all.
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This paper provides a simple explanation of the real facts about sampling of gold, either in the field or in the plant, and provides results for a number of cases of combinations of fine and …
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No reputable concern to-day would think of attempting to determine by grab-sampling the amount of gold, silver, lead, or copper contained in an ore, and yet many buyers expect the miner to accept the results of grab …
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also used to compile a guideline on leading practice procedures for sampling methods in gold mining. This article is an overview of sampling best practice found in African mining Keywords theory of sampling, best practise, sampling errors, sampling ... case where the grade of waste dumps, tailings dams, or other three-dimensional lots is ...
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2) The gold grade of the ample must be representative of the gold grade of the carbon in the vessel. 3) The sample preparation procedure must not introduce a bias of the assay sample from the original sample. 4) The assay methodology must reflect the true grade of the assay sample. 5) The samples must be taken at a time that coincides with
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Sampling Natural Exposures. Whenever a gold pan is used the result not only proves or disproves the presence of gold, but also usually, shows accurately the amount of …
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Residues contained in sand dumps and in slimes dams consist essentially of three different products, namely separate sand and slime and slime from the all-sliming process. In the early …
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Poorly designed sampling protocols generally result in high project risk by artificially increasing grade variability (ie the nugget effect). Sample collection, preparation and assay protocols that suit the ore type, together with QA/QC systems, will reduce this risk. All reporting codes (eg JORC, 2004) require the Competent Person to consider the quality and implication of sampling and ...
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18. • Drilling samples both core and chips are logged in order to record the material characteristics along the drill hole. • Samples are logged for: Rock types Alteration types Association of various minerals Estimated content of the desired commodity Core samples are also logged for: • fracture spacing and intensity, • Rock quality designation • And fracture …
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and behaviours of the sample are, and what kinds of information can be derived from the data. There are many questions needing answers concerning the sampling procedures and processes. For example, how good a sample is 1 kg of rock with 1 cm top-size fragments? If the lab crushes my gold ore sample to 10 mesh (1.7 mm)
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The procedure for assay of gold bullion, as described has for its sole object the estimation of the percentage of gold present in the alloy, all other constituents being disregarded. In the first instance, the simple case of the assay of gold alloys containing appreciable quantities of only copper and silver will be dealt with. ...
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This new procedure involved collection of the entire drill sample from the drill... Sampling of the mineralised tailings dumps – case study of the Mount Morgan project, central Queensland, Australia - M. Abzalov, C. Newman, 2017
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The sample points are set out and marked on the slimes dam by a land surveyor using a GPS system. The X and Y co-ordinates of each point as well as the collar elevation are measured and recorded. Every sample point is plotted on the survey map and is given a consecutive number which is matched to a sample number and hence to a gold and sulphur ...
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Tajikistan possesses large reserves of dump tailings characterized by a high gold content. The formation of these dump tailings is associated with the low cost of gold in the past, since rich ores with a gold content above 6–8 g/t were more often involved in processing. At recovery of ≈ 70–75%, tailings with a gold content below 1.8 g/t were disposed of. The paper …
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The gold head grade of the sample was calculated to be 1.1 g/tonne with a final gravity gold tailings grade of 0.6 g/tonne. The grind P80 of the final stage was 76µm. Based on project P420B by AMIRA, the concentrate gold grain sizes corresponding P20, P50 and P80 values for the sample are 55, 122, and 218, respectively thus classifying the ...
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Enough such samples must be taken to prove the continuity of the "pay streak." Mechanically the procedure of sampling a gravel face resembles closely that pursued in lode mines. A pan and a pick are the requisite tools. The bank should be trimmed well and cleaned along the sample line to eliminate effects of surface weathering.
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