Permafrost

discussed in view of geotechnical and hydrogeology. Thaw settlement mitigation measures
were also evaluated based on soil geotechnical and hydrogeology properties.
Keywords: permafrost, thaw settlement, embankment stability
Cryogenic physical and chemical technologies ore dressing and
processings of minerals of natural and technogenic deposits of gold
S.B.Tataurov 1 , Petrikey A.L. 2
(1. Institute Natural Resources, Ecology and Cryology, Siberian Branch, Russian Academy of Science.
P.O.Box 539, Lenina, 54, 672010, Chita, Russia, E-mail: tataurovsb@mail.ru;
2. “Galatr Ltd” Shirokay, 9, build. 1, ap. 157, 127282, Moscow, Russia.E-mail: petrikey@mail.ru)
Abstract: Last decades the heap gold leaching is widely applied in Russia, including areas with
wide development of permafrost. Applied world technologies of heap leaching are not
considering the climate conditions of Russia. It decreases the efficiency of heap leaching and
sometimes and conducts to the fail. The Laboratory of the General Cryology Institute of Natural
Resources, Ecology and Cryology of the Siberian Branch of the Russian Academy of Science
(INREC SB RAS) develops the approaches of using the natural sources of energy in permafrost
for optimization of efficiency of technology ore dressing and processings of minerals of natural
and technogenic gold deposits.
The goal of experiments was to reveal and to quantitatively describe the influence of nival
and subaeral cryogenic weathering on ore dressing and heap leaching. We offer the algorithm of
ore dressing technology with using the natural source of energy for increasing of they
efficiency.
We developed the complex researches method to checking the efficiency of cryogenesis on
ore dressing with application of thermal loading. This method included the estimation and the
forecast of decomposition processes and change of geotechnical properties of rocks. Also it
included an estimation of cryogenic weathering (cryogenesis) role in a strength decreasing and
partial destruction of structural communications auric ores and leaching of them.
The cryogenesis results in ore shattering with desired size. The change of a strength of ores
and of their open porosity leads to significant reduction of power inputs. The power inputs on
ore dressing after influence cryogenesis were reduced to 7.5 %. Also it was established, that the
efficiency of leaching ore gold depends on the weathering in subaeral and nival conditions and
increases accordingly on 20 and 40 %, than at non transformed ore.
The received results have allowed to offer the new technological scheme of heap leaching
that includes the intensification of physical and chemical processes in a ore stack with using the
natural sources of energy, that allows to essentially accelerate the technology of ore leaching
that decreases the deterioration of the crushing equipment in cold regions. This technological
scheme can be use as basic for the heap leaching in permafrost.
This work is executed in according with the program of basic governmental researches
“Kinetics and mechanics of cryogenic processes in permafrost”.
Key words: heap leaching, permafrost, cryogenesis, geotechnology, ore dressing.
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