Method of determining gold mineralisation of rock formation

FIELD: mining.

SUBSTANCE: method of determining gold mineralisation of rock formation comprises multistage crushing of raw material to fractions of the size not greater than 0.5 mm, the subsequent classification of the resulting material and its processing with bromoform. Classification is carried out by sedimentation with the separation of the material class of -0.05+0.02 mm of water discharges, followed by drying and sieving the remaining material with the separation of the fraction -0.5 +0.1 mm and -0.1+0.05 mm, treating each of the resulting classes with 10-30% alcohol solution of bromoform. Sedimentation is carried out once with the accumulation of sediment for 15-20 min and repeatedly for 3-5 minutes, followed by the integration of the water discharges obtained during it.

EFFECT: increase in reliability of determining of gold areas and determining areas of gold mineralisation.

2 cl, 1 ex

 

The invention relates to the field of exploration in search operations for gold, as well as the analysis of rocks, ores, by-products and can be used in Geology, Geochemistry to identify gold-bearing areas, identify areas of gold and increase the efficiency of extraction of gold from rocks.

It is known that the main losses in the extraction of placer and lode gold are thin, plate and powdered gold with a particle size from millimeters to a few microns.

According to current estimates at current methods of extracting gold using traditional washing methods, it is lost from 20 to 50% gold. Tightening environmental requirements, such as a ban on the use of mercury, also limits the potential for reducing losses. Another, no less important, aspect of the problem "fine gold" is that it's time to pay attention to a significant number of placers that have accumulated over many decades, containing significant amounts of fine fine gold.

Thus, the urgency of finding an effective technical means and methods for the detection of gold-bearing areas, identify areas of gold and to retrieve such gold from the source of raw materials and products of its processing are obvious.

Known dry method of preparing geological or technological samples of gold-bearing ores and placers to the analysis in order to reduce the cost of the extraction process and increase the reliability of determination of gold rocks. The dry sample containing coarse gold, crushed and sent to a special classifier, made in the form of vertical tubes with upward air flow. Received light fraction dry samples sent for deposition in the subsequently installed centrifugal apparatus, and the resulting heavy fraction - gold concentrate - gospelchor and sent to the processing similar to the processing of the original sample. Then final the gold-bearing concentrate fully, and light fraction after mixing and abbreviations sent for tests.

The disadvantage of this method is its complexity, the need for special equipment - classifiers, moreover, it does not provide retrieval of small fine grains of useful component [RF patent №2372152, G01N 1/00, publ. 10.11.2009].

There is a method of determining the gold content of rocks during search operations on gold, including sampling, chopping, mixing with infusible solid Royal vodka and heating the mixture for 3-5 minutes in a closed TIG is e to obtain wasgone in the form of plaque on the walls of the crucible. The result of the presence in the sample of gold is judged visually by yellow and/or orange color of the specified RAID [application for the grant of a patent of the Russian Federation No. 2007148258, G01N 1/00, publ. 27.06.2009].

However, this method does not provide the reliability of the results and does not provide retrieval of small fine grains of useful component.

In recent years, there has been a wide proliferation of new methods of studying rocks, among which a special place is occupied by method of heavy fractions or artificial concentrates, allowing study of accessory minerals of igneous rocks.

Known selection scheme accessory minerals of basic and ultrabasic rocks, taken as a prototype, the proposed Liakhovich VV [Methods of separation of accessory minerals. - M.: Nedra, 1981. - 86 S.].

The chemical composition of accessory minerals is that they contain elements that are present in the breed in very small quantities, but they give a more full and perfect understanding of the studied rocks.

The method includes crushing of the raw material to a fraction of not more than-0.5 mm by multi-stage crushing with otstavnoi small fraction of each cycle after the crushing, otmuchivanie from dust and drying of the material, followed by electromagnetic separation on a non-magnetic and magnetic fractions. Further isolated and the electropneumatic and rock-forming minerals from non-magnetic fraction, conduct division bromoform on heavy and light fraction.

Light fraction addition gospelchor have otstavke and szlifowane, is subjected to electromagnetic cleaning and lapping up monomineral fractions.

The heavy fraction is subjected to separation by heavy liquids to obtain different density mineral concentrates, conduct electromagnetic cleaning and lapping up monomineral fractions.

The magnetic fraction is subjected to electromagnetic separation on magnetic and signmagnitude faction with the release of rock-forming minerals.

The fractions obtained are subjected to separation by heavy liquids and Ligovka in bromoform.

Many of the listed sequence can be repeated many times in different sequences.

The technique allows you to set a variety of the species composition of ore minerals, but very complex in execution. Moreover, the technique is not designed to work with "thin” classes, ultramarine fractions order to-0.05+0.02 mm, which may contain gold and other valuable items from the rocks.

This scheme also stated V.V. Mikhailov, V.V. Gordienko. "Simple laboratory methods allocation monomineral fractions": Textbook.-method. allowance, S.-Petersburg Academy of Sciences. state University, 2012, p.24-26.

The objective of the invention is one is to simplify the method of selection of accessory minerals from rocks and ensuring allocation ultramatic fractions useful component,

The technical result is to increase the reliability of detection of gold-bearing areas and identify areas of gold

The problem is solved in that in the method of determining the gold content of rocks, including multi-stage crushing of the raw material to a fraction of not more than-0.5 mm, the subsequent classification of the material obtained and the processing of bromoform, this classification are by sedimentation separating material class -0,05+0.02 mm of water discharges, followed by drying and sieving the remaining material emitting fractions of 0.5 to+0.1 mm and -0,1+0.05 mm, and processing each of the derived classes 10-30% alcohol solution of bromoform.

Sedimentation lead once the accumulation of sediment within 15-20 min and repeatedly within 3-5 min, followed by combining the resulting water drains.

Sedimentation is a method of separation by size (size) clay fractions, taking into account the time of deposition of the material. The inclusion in the scheme of this phase separation, increases the reliability of the content of the desired minerals (gold) by collecting ultrafine fractions. Ultrafine fraction relevant now, because the new instrumental methods (instrumental, methodological and so on) provide the opportunity to study them.

It is known that at wash in bromoform fine grains of gold is not wetted and sail away to the left. To avoid this, it is proposed class -0,05 and -0,1+0,05 to wash in the washing of bromoform (alcohol+10-30% of bromoform), where and are supermarche "gold particles".

Example

A sample of the investigated material is a sulfide ore weighing 200 g (sample can be of any complexity in composition) crushed to a fraction of not more than-0.5 mm by multi-stage crushing followed by sedimentation

Pour a sample of distilled water from the condition that the height of a water column corresponded to 20-25 cm, mix and stand for no more than 15-20 min 15-20 min larger class -0,05 mm is precipitated, and smaller still in suspension. Suspension is drained, the resulting merged suspension remained particles less than 0.02, suspension defend, analyze sediment.

Then re-fill the sample with distilled water, mix and stand for no more than 3-5 minutes, the Procedure was repeated more times to "clean water" (repeating the process depends on the quality of the source material - samples)

Water plum unite, defend, the precipitate is separated and dried. The result is a material with a weight of about 2 grams small (ultramega) -0,05+0,02 sediment.

After that, the remainder of the sample is dried and rasshivaetsya, resulting in a derived class 0.5 to+0.1 mm and -0,1+0,05 mm After drying and dispersion receive hinge 60 and 130 grams, respectively.

Further blur each of you is Alannah classes in an alcohol solution of bromoform (alcohol+10-30% of bromoform) receive:

class -0,5+0,1 - gold is not found

class -0,1+0.05 to about 10 grains of gold

in class,0,05+0,02 - 10-11 grains of gold obtained in ultramega sought class)

The proposed method can be used to analyze any stone material. Samples can be mineral composition more or less complex, depending on the amount of minerals, their relationship (intergrowth), etc.

When using only one sieving, and without conducting sedimentation, loss ultramega class, the most informative for the prediction of gold squares.

As a result, the method allows to select ultramercial fraction of gold, which certainly increases the reliability of detection of gold-bearing areas and identify areas of gold. Moreover, the method becomes cheaper.

The proposed method can be applied in the field, in this case, increasing the efficiency (focus) prospecting, because at the place specified area most promising sites.

1. How to determine the gold content of rocks, including multi-stage crushing of the raw material to a fraction of not more than-0.5 mm, the subsequent classification of the material obtained and the processing of bromoform, characterized in that classification are by sedim is ncacii separating material class -0,05+0.02 mm of water discharges, subsequent drying and sieving the remaining material emitting fractions of 0.5 to+0.1 mm and -0,1+0.05 mm, and processing each of the derived classes 10-30% alcohol solution of bromoform.

2. The method according to claim 1, characterized in that the sedimentation lead once the accumulation of sediment within 15-20 min and repeatedly within 3-5 min, followed by combining the resulting water drains.



 

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