THE BEREZOVSKIY ORE FIELD

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80-00809A000600280862-4
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 4
• Document Creation Date: December 22, 2016
• Document Release Date: September 21, 2011
• Sequence Number: 862
• Publication Date: February 14, 1950
• Content Type: REPORT

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CLASSIFICATION GnFauLitl?iAa.
CENTRAL INTELLIGENCE AGENCY
WHERE
DATE
LANGUAGE Russian
TNID' DOLV NBN4 tSRt*INI INIODIIATION OIIICTIND TNf NATIONAL DQIQNIQ
O' TN1 UNI4QC ST;T1S O'ITNIN 10! OCAN:NO 09 CDTIONASI CC! NO
Y. A. C.. 11 QNO'D. ITS TN;NINIll ION ON TN! 'ELATION ITS CONTINTI IN ANT NANNIN TO AN VNAVTHONICQC IINDON 13 9N0
4I8I1I0 NT LAN. Of INOO4C!ION OQ Poll ION. IA SNONINITIC,
DATE OF
INFORMATION 1947
DATE DIST. /y Feb 1950
NO, OF PAGES 4
SUPPLEMENT TO
THIS IS UNEVALUATED INFORMATION
SOURCE Izvestiya Akademii naui: SSE, H, Seriya Geoiogichesksya, No 6, 1947,
(A review of N. I. Borodayevskly's and M. B. Borodayevskaya's
Berezots a rudro pole C-solo chesko a atri eai a -- (The Berezov-
skiy Ore Field Its Geological Structure . Edited by Academician D. S.
Belyankih; published by Nigrizoloto Institute, Moscow, 1947.)
The Berezov.,xiy gold deposit in the Jrals is the oldest gold deposit in the
U&SR. It is known even in foreign literature because of some of its peculiarities
in composition and structure, and Lecauae of its richness. Although the deposit
attracted the attention of prospectors long ago and has been inspected and
briefly described by quite a few mineralogists and geologists, a detailed study
and description of it did not materialize for a long time. This lag is explained
,by the fact that there are no natural outcrops of o.ce at Berezovbkiy, and by the
'di Iact that until recently mining was carried on mostly among the weathered rocks
n the upper levels, rocks-which had lost their original structure and composition
and had changed into argillaceous products. Only the extensive prospecting and
exploitation work since the 1930's, which involved boring to great depths and
which was carried out over almost. the entire area of the ore field, has made pos-
sible a systematic study of the deposit. This study should have been made long
ago because of the urge?cr for exploitation of the deposit.
The authors of this monograph began to study Berezovskiy 10 years ago, after
the ore field had been mapped in detail by personnel of the Sverdlovsk Mining
Institute under the supervision of Docent P. I. Kutyukhin. Their book is in
effect reference work, having been written with the cobperation of several
mining geologists, with the use of copious documentary materials and detailed
maps, and with the advice of Academician D. S. Belyankin and Doctors V. M.
Kreyter and Ye. A. Kuznetsov.
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Chapter I contains general int' rmati'on about the location of the Berezovskiy
mines, including a geological rap of a t? en of the Urals and a sketch of the
60-meter level in the Kirov Mina, say. a deteiled history of the opening, working,
production from 1743 through 1925 is interesting. During these 182 yeerc,the
Berezovskiy mines and placers have yielied almost 112 million pud of ore, fro.
which 1,581 pud and 13 fuuts of gcid: have been obtained. Average gold content
was 5.40 pud per 100 pud of ore, chile the content range was from 2.60 to 8.54
nerezovekiy, including photograph which -;bows a general vies of the Lenin Mitie
and gives a conception of the flatness of the area. The chapter describes the
Mesocenozoic and Paleozoic depositions, the volcanic intrusions of ultrabasic
and gabbroid rocks, the Murzinsk-plabi.--u gneissoid granite complex, the gran to
by a geological map of the Berezovskiy ore field on a scale of 1 1:0,000, three
cross sections of the northern and _entrat parts of the ore field on a scai..c
of 1:4,000, e block iiagram of the f_ mod., axd seven cross sections through the
field along several lines on a scale of 1:20,000. The map and cross sections
give a good conception of the complex composition and structure of the field.
In Chapter IV is fonmd a petrographic description of the rocks of the
Berezovskiy ore field. They are sedimentary, pyroclastic, and effusive rocks;
which are products of regional and contact metamorphism, and rocks of gabbroid
peridotitic formation with their metamorphosed varieties.
Chapter V is devoted to the dikes of gra itoid veinstone. The stratification,
extensiveness, age, morphology, petrography, disjunctive structure brought about
by these dikes, and endo- and exocontactual metamorphism occurring in connection
with them are diucussed. The description is illustrated by a number of cketcbes
and cross sections in various scaler,. The petr?ograpal-cal description is illus-
trated by ~hotog apps
Chapter VI examines the granitoid dikes as a source of beresite ores. Beresites
and listvenites, their stratlficati.on and relationships, the metasomatic changes of
porphyritic granites, the structure of zones which have partly changed into veinstone,
the origin of beresites, the characteristics of other rocks, and the rhangee caused
by. partial?veinstone metamorphism are described. Photographs, tables of analyses,
and tables showing mineralization stages when changes into beresite and listvenite
occur, illustrate the text.
In.Chapter VII, there is a description of ore-bearing veins and their structure.
? Scheelite-bearing (quartziferous tourmaline) and gold-bearing formations are des-
erited. The description is illustrated by diagrams, sketches, and cross sections.
The illustrative material has been taken from documentary mining materials and
includes sketches of mine faces and mine roofs in various scales.
Chapter VIII is occupied with epigenetic structure (poslerudnaya tektonika)
which, however, has not as yet been clarified to any great extent, as the authors
point out. They devote only several rngee, a diagram, cross sectioc, it block
diagrams to it.
n .r
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be made from the total knowledge etoul the geology of the ore field, knowledge
obtained by combining the in`or?m"'ic~?. er oi' from theoretical research and from
plicate the romposit.on and often o.-cure the interrelationships between these
various rocks ?till further r..n!:ral)y, '.hear- roc'hs belong the rather deep
levels of the syncline but do er,,ear et. the surface of the earth because of the
and variegated veinetoor, ;.c^ .1e in i-r.tinate association with, and
overlap each other, end in r _te regional and contact metamorphism corn-
explain the complex compoeiticn and _ti,i more complex structure of this field
in which sedimentary, effoeivea eel,.inic. intr eive ultrebasic, basic veinstone,
argillaceous ochists, siliceous and siliceous chloritic tuffs, tufaceous sandstones
and further down, massive 5:c) o `,erna,tc with seams of tuffs, volcanic
kreccia, diabases, and ciiiceouo rcck..e. The stratum lies on granular and massive
plagioclastic porphyritic t'affe, 'd ich in turn lie on massive and granular diabases.
These lower ig'eous rocks and t-of.f, ae__cns to the Middle and Lower Devonian.
Tnfaceoue sedimentary rocks make up the nc-:theast running anti- nd synclinal
folds, which are overturned and broxen in the southwest by faults and other uis-
locations. Ultrabasic rocks, for the most part Serpentine rocks, intrude into
this tufaceous sedimentary stratum in the form of huge conformable sheet-like
or laccolithic bodies; dikes and docks of plagiogranite and diorite, and in
some cases also gabbro, fait the ae.rpcntine-rock -intruded tufaceous sedimentary
stratum. Many of the gabbro massif. also have a sheet-like form and are found
along the outer edges of the ultraba_ic rock intrusions.
According to the description of the researchers, the Berezovskiy ore field
has the following structure. Mainly, it consists of a Lower Carboniferous and
Upper Devonian t^facecu, eedimente y erratum in which siliceous and siliceous
All of the rocks involved in fauli;ias undc:go ragional and contn:ct metamorphism.
The veinstone rocks are typ'cal tikes e.tratigrarhically, but in composition and in
chronological sequence of intrusion they are plagiosyenitic porphyries, diusiteo,
dioritic porphyries, granite porphyries, and plagiogranite porphyries. The dikes
are from 2-3 to 10-12 meters thick. On an average, they are 1.5-2 kilometers, but
sometimes up to 9 kilometers, long. Plagiosyenitic porphyries make up 52 percent
of the prospected gold-bearing dikio, plagiogranitc porphyries 34 percent, granite
porphries 12 percent, and diorites 2 percent. For the most part, the dikes 1o11ow
a meridieaal direction. Their dip is steep to perpendicular. Throughout the
entire ore field, the dikes of every succeeding group cut the preceding.
All gold, ncnferrous, and rare metal deposits of the Berezovaki.y ore field
belong to one metallogenetic cycle, that associated with, granite intrusions;
chronologically, however, they belong to the most recent system of granitoid
veinstone rocks. Almosi all deposits represent hydrothermal filling of fissures
and have become granitoid rock dikes. The sectors with the most dikes become the
ore fields, i.e., dikes determine the areas important enough to be prospected and
exploited. Quartz is the veinstone mineral; gold and wolfram are the most impor-
tant industrial ores; polymetallic ores are found lees frequently, and molybdenum,
very rarely. The wolfram deposits, which are mostly scheelite depoalti. are
located in the outer edges of the &:auite massifs or in their contact aureoles.
The gold and polymetellic ores are located at a distance from the granites. The
overwhelming majority of gold-bearing rocks lies among the carbonaceous rocks and
chloritic carbonaceous schists. Ore-bearing qualities are always noted in connec-
tion with the carbanization of rocks.
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long time. They have been used from the time of G. Rose to desigrate some
of the peculiar varieties of rocks at Berezovskiy. The term "beresite"
designates a variety of granite porphyritic rock which developed under the
influence of carbonic hot springs containing potassium. The term "listvenite"
designates ultrabasic plutonic and effusive rock which has been changed by
hot springs. Formerly, listvenite was considered to be metamorphosed lime-
The authors of the monograph have examined the origin of beresite in
detail and have come to the conclusion that in changing to beresite, normal
granite porphyry has loot quantities of its silica and almost all of its sodium
oxide and has gained K20, Hp0, MgO, and FeO. Beresite and listvenite are
syngenetic developments, and the changes into beresite and listvenite are
virtually two branches of one hydrothermal metaaomatic process. Under list-
venite the authors understand rock consisting of ankerite and potash mica as
the main minerals; under beresite they understand rock consisting mainly of
quarto, potash mica, and pyrite. Beresite, in their opinion, is to be regarded
as a particular inctance of a transformation process applicable, to rocks rich
in silica and alumina and deficient in the RO group of acids.
Epigenetic structure is in general insignificant id scale. This is in
hermony with the fact that recent movements of the Mesocenozoic have generally
n.ot been strong in the Ureic and have not occurred at all in certain parts of
the Urals which still retain the ancient relief created at the beginning of the
Mesozoic. The Berezcrsiciy field, as tell as the environs of Sverdlovsk, belong
to those parts of the mountain system. These epigenetic movements (poslerudnaya
dvizheniya) could still very well be Paleozoic and represent either faults with
a steep dip and a meridional or diagonal course, or ove"thrusts with a compara-
tively sloping dip and predominantly meridional course. The faults or over-
thrusts sometimes lead to a breaking down and, displacement of quartz veinstone
strata much thicker than they themselves are. More significant dislocations are
found in regions where these dislocations have taken plat' in earlier times.
Eiigenetic dislocations (poalerudnaya emeshcheniya) !.:e indicated by the forma-
tion of mylonite and breccia with a part cZ the quartz veinstone in the form of
detritus. Epigenetic ;.tructure comp_.cates and increases the cost of m. 4uing
operations, but mine-survey documentary materials made it possible to carry on
prospecting work for ore-bearing veins which have been sev.red by dislocations
but whose location and course are more or less clear.
In canclnaion, the authors point out the great importance of knowledge of
all the characteristics of the Berezovskiy ore field for the near future, when
the deeper levels will be exploited. At these deeper levels, a knowledge of
structural features will be of paramount importance. This monograph could
help to aurst,)unt the difficulties since it is the first to give a complete des-
cription of this complex and extremely interesting deposit and is a very valuable
scientific work.
With the issuance of this work, the Nigrizoloto Institute has resumed its
publishing activity, which had been interrupted by World War II.
.J? - E N D -
CONFIDENTIAL
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