Method of combined processing of sands of gravel gold deposit in bolshoy kuranakh river

FIELD: mining.

SUBSTANCE: method includes separation of sands by quality by means of establishment of upper and lower limits of a producing part with different content of a useful component, further, after development of sands using the method of preliminary separation of coarse fractions, high-quality sands are supplied for enrichment, and an intermediate process reservoir, where low-quality sands are stored, is used for natural separation of rock and metal minerals by density in water medium and concentration of a precious component in a lower layer, then the upper layer is removed, and the lower concentrate layer from the process reservoir is sent for enrichment. Low-quality sands pass through additional stage of useful component concentration by natural separation of minerals by density, at the same time gold particles are concentrated in the lower layer, and clayey particles go into drainage.

EFFECT: improved performance indices of sands processing, reduced losses of fine gold, lower processed volumes.

2 dwg

 

The method relates to the mining industry and can be used in mining and processing of sand unique placer gold deposits of the river Big Kuranakh.

The uniqueness of the field lies in the combination of its mining and geological conditions, the composition of the sand and qualitative characteristics of the distribution of reserves of useful component.

The scattering length is up to 22 km, the maximum width is up to 1600 m, depth up to 50-60 m below the groundwater level, sand reserves are about 275 million m3the volume of overburden is more than 115 million m3. Dominated by rocks with clay content from 16 to 67%, with almost half of this amount is silt-clay fraction (-0,1 mm). Free gold in the sand very fine. About 60% of his presents size classes -0,25 mm, including 0.02 mm - 24%. Gold is closely associated with clay minerals, which leads to a considerable part of the metal in the discharge, together with clay particles. To 25-35% of the volume of sand is represented by a class +30 mm not subject to phase separation and transport it in this connection causes additional unnecessary costs.

The main feature of the placers is that a relatively small portion of sand (about 20%) is concentrated large part of the reserves of metal (50-60%), is then characterized by the uneven quality stocks. However, even within the boundaries of the certified unit are areas of low metal content. The experience of the development of such deposits, the mining blocks with plots (areas) low metal content unprofitable.

Thus, the hallmarks of the placer gold deposits of the river Big Kuranakh are unique geological conditions, the heterogeneity of the quality of reserves, a large number of small gold in Association with clay minerals, a significant proportion of coarse particles in the particle size distribution of the Sands. Currently, the development of such fields is gross way using traditional technologies.

The known method development scattering [1], including the establishment of upper bounds productive part placers, removing unproductive layer and enrichment of ore productive part of the scattering with production of ore concentrate valuable component.

There is a method of development of placer mineral deposits [2] the complex influence of pressure and gravity flows, in which the surface layer of rocks, represented by larger factions, wash jet jetting setup accumulating in the trench, where the coarse fraction is removed by a bulldozer blade, and small particles of waste rock and the useful component are sent to the washing installation.

The disadvantage of these methods is the fact that the Sands are processed gross way, so as not provided and will not run geometrization productive array of quality (content) of the metal in the technological scheme of processing does not include the additional process of concentration of small particles of gold.

The closest to the technical essence and the achieved effect to the proposed method is a method of placer developments [3], including the removal of peat, preparation for freezing, seizure and enrichment Sands, which is the effect of the concentration of gold-bearing useful component in the lower part of the field, through the use of generators of low-frequency vibrations or vibrating processing array with simultaneous saturation of the water supplied from the uniform or pulsating flow prototype.

But in this way not provided by the geometrization productive array of quality (content) of the metal, and sand practiced gross way.

From the analysis above analogs can be seen that none of them can be achieved with high quality and full processing of sand placer deposits of gold river Big Kuranakh.

To solve the problem, followed by the preparation and exploitation of alluvial deposits of the geometrization of zapasa is on the basis of content (1), include in the technological chain operation prior downhole sort of sand (2), providing an additional concentration of small gold particles (3).

This solution requires:

- (1) the geometrization of the field, determination of quality borders on the content that perform data processing geological sampling with interpolation methods, for example by the method of Kriging;

- (2) pre-washing on the washing facilities (sorting complexes) to obtain granular concentrate of a particular size, with separate large boulders and gravel that does not contain mineral [4]. For the proposed method of processing, in contrast to [4], output sorting complex provides the quantity of the product in the two transport streams, depending on its quality.

After excavation and prior to the separation of large fractions of the extracted material Sands high quality go directly to the enrichment Sands low quality in technological capacity.

- (3) additional concentration of small particles of gold by separating mineral density in water-slurry environment in technological capacity. This process is based on the well-known effect of the velocity difference of the fall of the minerals in the water depending the spine from their weight. There is a natural classification of material density with care the most fine clay fractions of the drain. As a result, in the lower part of the section creates a layer with a high concentration of valuable components, in the future, after cleaning the upper layer sent for enrichment.

The implementation of how the combined processing illustrated figure 1.

The proposed method differs in that prior to the testing methods of interpolation, for example by the method of Kriging, to make a separation of sand quality by establishing upper and inner borders of the productive part with different mineral content, then after development and sorted Sands high quality serves to enrich and intermediate technological capacity, where store the Sands of low quality, is used for the natural separation of mineral density of rock and metal in the aquatic environment and concentration of valuable components in the lower layer, then the top layer is removed, and the lower gap layer from the technological capacity serves to enrich.

The proposed method has the following advantages compared with the prototype.

Introduced in the formula of the invention, a significant feature, as that prior to the failover produce selection is not only the top but also internal borders productivity is the second part of the content, allows you to define the volume of direct processing of sand and amounts allocated on a secondary cycle of concentration, providing, thus, the selectivity of the productive processing of array technology appropriate to the content of useful component.

Another significant feature is that after a preliminary separation of large fractions of the resulting intermediate product is sent for recycling in accordance with its quality or enrichment or additional stage of concentration, for which the flushing unit (sorting machine) equipped with a switching device of a transport stream in accordance with the quality of the intermediate product.

The third essential feature is that the fine gold associated with clay minerals, is subjected to additional cycles of concentration by controlled separation of minerals by density, using known methods of active influence on the deposition process [5], this allows to reduce the loss of the gold particles of size less than 0.2 mm, the share of which in the metal placer gold deposits of the river Big Kuranakh - up to 60%.

A specific example of implementation of the proposed method is shown for plot placer gold deposits of the river Big Kuranakh around razvedok the nd line 120. On a geological cross-section (figure 1) shows the contours of the industrial unit and the selected border quality Sands on the criterion of the minimum content of the sample included in the industrial circuit (70 mg/m3).

In the context it is clear that the boundaries of the industrial units are areas with low metal content (for this exploration line not less than 15% of the total). Currently in the processing of the gross way that leads to deterioration of technical and economic indicators of production.

As the experience of the application and screening systems, depending on the particle size distribution of Sands in the preliminary sorting reduced volumes transported to the beneficiation plant, from 25 to 40% [6].

To assess the effectiveness of gravity separation mineral density in technological capacity using equation T.g.fomenko [7], taking into account the dependence of the rate of fall of the grains in the aquatic environment from their form: V0=16,3G0,34, where G is the weight of the particles. The calculation showed that with decreasing particle size, the difference in the velocities of falling increases from 0.5 to 0.05 mm, the difference in the velocities of falling increases from 3 to 9 times, and up to 0.02 mm in 20 or more times (figure 2).

The sieve analysis of the composition of the gold enriched sand placer deposits of gold river Big Kuranakh the certificate is confirmed, the content of gold particle size less than 0.25 mm, depending on the area (area) mining, is in the range from 41.2 per cent to 61.1 per cent, while the losses currently amount to 16.1-18.2 per cent during dredging processing and up to 11% - in the processing at the processing plant. Thus, the introduction of the technological scheme of processing of sand additional stages of concentration, taking into account the degree of controllability of the process allows to count on additional metal recovery up 10%, at a given particle size distribution of sand and metal placers.

Sources of information

1. Application 97117649/03 23.10.1997, AS 41/22 Agin VP, Davydov I.A. Way to develop placers.

2. RF patent for the invention №213952, AS 41/30. Application 97119572/03 from 27.11.1997 Litvintsev, V.S., Mamaev Y.A., bulaevskii A.M., Ponomarchuk G.P. Way to develop placer mineral deposits complex influence of pressure and non-pressure water streams.

3. RF patent for the invention №2106495 C16AS 41/00. Application 94029218/03 04.08.94 Mikhailov A.G., Wagner, VA, Bragin V. Method of placer developments.

4. RF patent for the invention №2239066, AS 41/26. Application No. 2003119472/03 from 26.06.2003, Akishev A.N., Bakhtin V.A. Bondarenko E.V. Method development and initial concentration of alluvial deposits of diamonds.

5. SU 1065025 A 07.01.84. , Armipotent. Way hydraulic classific is of solid particles by size.

6. Kozybaev AV, Kornev VG, Kleimenov CENTURIES, Ermakov S.A. Experience and prospects of development of placer deposits Abelanski diamond square. // Problems and prospects of integrated development of mineral deposits in permafrost: Proceedings of the Intern. nauch.-the practical. proc. (IGDS Yakutsk, June 14-17, 2005). - Yakutsk: Publishing house of the permafrost Institute SB RAS, 2005. - Volume 1 S-233.

7. Fomenko YEAR Gravitational enrichment of minerals. - M.: Nedra, Moscow (1966). - p.29, 320-321.

The method of combined processing of sand placer deposits of gold river Big Kuranakh, including the establishment of the upper boundary of the productive part of the field, the removal of the upper productive layer, an intermediate technological capacity, mining of sand in the path of reserves with a preliminary separation of large sand fractions by the method of washing, beneficiation productive part of obtaining a concentrate of the valuable component, characterized in that prior to the testing methods of interpolation, for example by the method of Kriging, to make a separation of sand quality by establishing upper and inner borders of the productive part with different mineral content, then after development and pre-sorted Sands high quality serves to enrich and intermediate technology E. the bone, where store the Sands of low quality, is used for the natural separation of mineral density of rock and metal in the aquatic environment and concentration of valuable components in the lower layer, then the top layer is removed, and the lower gap layer from the technological capacity serves to enrich.



 

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