Burdin N.V., Lebedev V. I, Lebedev N.I.
The Tuvinian Institute of the Exploration of Natural Resources of the
Siberian Branch of the Russian Academy of Sciences, Russia
GOLD-COPPER-PORPHYRITIC ORES OF TUVA.
Features
of a geological structure and matallogeny of Eastern Tuva within of which the
perspective objects of gold-copper-molybdenum-porphyritic ore formations are
concentrated, this allow to allocate a gold-copper-molibdenum province with an area of about 70 thousand square
kilometers. Stripped, looped and brecciaed structures are characteristic for
ores. Ore minerals are presented, basically, by bornites the quantity of which
exceeds 15-20 %. Chalcopyrite and native gold are marked in a small amount. The
gold maintenance fluctuates from traces to 150 g/t, the average maintenance is
8,2 g/t; copper from shares to 20 % and more, its average maintenance is 3,9 %. Besides, the presence of silver with
the maintenance to 28 g/t is established.
To
the number of the main problems provided by Strategy of social and economic
development of Tyva Republic for the period till 2020 and demanding the prime
decision, concern: working out of scientifically proved recommendations about
escalating of a mineral-raw-material base of precious metals; creation of
effective geotechnologies and concentrating devices of extraction of gold for
the purpose of repeated increase in volumes of gold mining in the region. These
problems are solving by the TuvIENR SB RAS collective: carrying out specialized
prognostication-metallogenic researches on revealing in the well-known gold-ore
areas of Tuva, perspective on revealing of industrial ore objects of Au-Hg-argillisite,
Au-beresite and Au-carbonaceous-sulphidic formations; introductions of the
developed effective technologies of industrial extraction of small and fine-dispersion
gold and passing components from the oxidized and semi oxidized ores; introduction
of technologies of enrichment of mineral raw materials on the basis of created
in TuvIENR SB RAS devices of primary gravitational enrichment and modular
hydrometallurgical concentrating installation of high-temperature lixiviation. Maximum possible achievable degree
of gravitational extraction of small, thin and disperse fractions of precious
metals without application of ecologically dangerous chemical reagents still
remains one of the most challenges in economic efficiency increase at
abandoning of ore deposits. At the first stage the research and developmental works,
the object of which is the creation of experimental installations for an
estimation of parametrical characteristics of moving of heavy parts in streams
of a pulp of various densities, have been performed. Distribution of minerals
and metals of the raised relative density at the constrained falling in the
heavy environment, and also in vortical and ascending streams, in a centrifugal
field and etc.
Along with successful tests of sounding
type concentrating devices of various productivity [1], the Institute continued
researches and the developmental works focused on application of a centrifugal-vortical
principle of enrichment of mineral raw materials with concentration of heavy
thin metals, minerals with the use of "effect of a funnel" [2]. Semiindustrial
tests of technology of "Kyzyk-Chadyr" deposit ores enrichment have
been carried out with processing of 5 tons of initial ore on range of TuvIENR
SB RAS. Studying of material structure of ore sample from the quartz veining 3
richest with gold is carried out with the use of spectral, chemical, granulometric
and mineralogical methods of the analysis. Data testify that the basic
industrial value of ore defines the gold which average maintenance in a vein is
14,6 g/t. The maintenance: 9,2 g/t of silver
and 4,3 % of copper is present in ore according other passing valuable
components.
Conclusions:
1. The
Kyzyk-Chadr deposit belongs to a category of large poorly eroded objects and
deserves geological study with promarketable structural chinks for opening of
deep parts of ore-bearing stockwork in 400-900 meters interval.
2. All
revealed areas of stockwork gold-copper-molybdenum-porphyritic mineralization, gold-quartz
veining fields and linear bodies of kuzyk-chadr granite-porphyritic complex in
aggregate form uniform ore-magmatic system.
3.
Experimental researches and semiindustrial tests of the process equipment have
allowed to create the effective technological scheme of enrichment of
Kyzyk-Chadyr deposit’s veining ores and to reach high indicators of extraction
from quartz-veining ores in gold concentrates - 99,2 %, silver concentrates - 92 % and copper concentrates - 80,2 %; according
to the maintenance of valuable components in gravitation tails, the leaching is
economically inexpedient.
4. Received
gold-copper concentrate concerns to a category of top copper quality KMO (GOST
48-77-74).
Work
is executed at financial support of the project of the Russian Federal Property
Fund, Grant ¹ 06-05-64118-à.
References
2. Burdin N.V.,
Lebedev V. I, Chadamba P.V. Mechanical wash pan sluice and a way of enrichment
of heavy minerals and metals. / Patent of the Russian Federation ¹ 2147934. Ì: Russian agency on patents and trade marks. –Bulletin
¹ 12, 2000. – p. 14.
3. Burdin N.V., Lebedev V. I. The way of
enrichment of heavy minerals and metals and the centrifugal -vortical
concentrator for its realization. / Patent of the Russian Federation ¹ 2210435.
Ì: Russian agency on patents
and trade marks. - Bulletin ¹ 23, 2003. – p. 10.