Mineralogy

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By William Petruk

Ideas of appearing utilized mineralogy investigations, and purposes and features of lately constructed tools for measuring mineral houses are explored during this e-book meant for practising utilized mineralogists, scholars in mineralogy and metallurgy, and mineral processing engineers. the advantages of utilized mineralogy are provided by utilizing in-depth utilized mineralogy experiences on base steel ores, gold ores, porphyry copper ores, iron ores and business minerals as examples. The bankruptcy on base steel ores incorporates a dialogue at the results of liberation, particle sizes and surfaces coatings of Pb, Cu, Fe, Ca and So4- at the recoveries of sphalerite, galena and chalcopyrite. The bankruptcy on gold discusses a variety of tools of picking the amounts of gold in numerous minerals, together with 'invisible' gold in pyrite and arsenopyrite, in order that a stability of the distribution of gold one of the minerals could be calculated. This booklet additionally discusses the jobs of pyrite, oxygen, moisture and bacterial (thiobacillus ferrooxidans) on reactions that produce acidic drainage from tailings piles, and summarizes at the moment used and proposed tools of remediation of acidic drainage.

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Extra resources for Applied mineralogy in the mining industry

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The SE image is not as useful as the BSE image for showing mineral distributions, but displays details of surface irregularities much better, and is particularly useful for observing individual particles mounted on double-sided sticky tape. The SE image can be produced at a much lower current and voltage than is required for the BSE image. X-ray signals are detected with the EDS detector. The minerals are identified by focussing the electron beam on a specific particle and collecting the X-ray signal.

The minerals in the BSE image appear as different shades of grey, depending upon the average atomic number. 1. Most silicate minerals have low average atomic numbers and appear dark grey in BSE images. In contrast, ore minerals have higher average atomic numbers and appear in shades of light grey to white. The shade of grey can, however, be changed by changing the contrast and brightness settings on the BSE detector. The differences in the shades of grey between the minerals can be either enhanced or reduced by changing the contrast, brightness, voltage and current on the SEM.

2. OPTICAL MICROSCOPES Hand specimens, drill core samples and large pieces of material are usually examined in ordinary non-polarized light with a binocular microscope at magnifications of about 5X to 1OOX, to select pieces for study, and sometimes, to make a preliminary identification of the minerals and textures. Polished, thin and polished-thin sections of the selected pieces, and of powders, are examined with optical microscopes using transmitted and/or reflected polarized light to: • identify the minerals, • observe mineral textures, particle shapes and mineral associations, • measure grains sizes using a calibrated eyepiece, • determine mineral proportions by point counting.

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