As has been said, mining refers to actual ore extraction. Broadly speaking, mining is the industrial process of removing a mineral-bearing substance from the place of its natural occurrence in the Earth's crust. The term "mining" includes the recovery of oil and gas from wells; metal, non-metallic minerals, coal, peat, oil shale and other hydrocarbons from the earth. In other words, the wo± done to extract mineral, or to prepare for its extraction is called mining.
The tendency in mining has been towards the increased use of mining machinery so that modern mines are characterized by tremendous capacities. This has contributed to: 1) improving working conditions and raising labour productivity; 2) the exploitation of lower-grade metal-bearing substances and 3) the building of mines of great dimensions.
Mining can be done either as a surface operation (quarries, opencasts or open pits) or by an underground method. The mode of occurrence of the sought-for metallic substance governs to a large degree the type of mining that is practised. The problem of depth also affects the mining method. If the rock containing the metallic substance is at a shallow site and is massive, it may be economically excavated by a pit or quarry-like opening on the surface. If the metal-bearing mass is tabular, as a bed or vein, and goes to a great distance beneath the surface, then it will be worked by some method of underground mining.
Working or exploiting the deposit means the extraction of mineral. With this point in view a number of underground workings is driven in barren (waste) rock and in mineral. Mine workings vary in shape, dimensions, location and function.
Depending on their function mine workings are described as exploratory, if they are driven with a view to finding or proving mineral, and as productive if they are used for the immediate extraction of useful mineral. Productive mining can be divided into capital investment work, development work, and face or production work. Investment work aims at ensuring access to the deposit from the surface. Development work prepares for the face work, and mineral is extracted (or produced) in bulk.
The rock surfaces at the sides of workings are called the sides, or hi coal, the ribs. The surface above the workings is the roof in coal mining while in metal mining it is called the back. The surface below is called the floor.
Unit 8_____________________________ •_______________ 193
The factors such as function, direct access to the surface, driving in mineral or in barren rock can be used for classifying mine workings:
I. Underground workings:
a) Long or deep by comparison with their cross-section may
be: 1) vertical (shaft, blind pit); 2) sloping (slopes, sloping drifts,
inclines); 3) horizontal (drifts, levels, drives, gate roads, adits,
crosscuts).
b) Large openings having cross dimensions comparable with
their length.
c) Production faces, whose dimensions depend on the thick
ness of the deposit being worked, and on the method of mining it.
II. Opencasts.
УПРАЖНЕНИЯ
8. Укажите, какие предложения соответствуют содержанию текста. Подтвердите свои ответы фактами из текста.
1. As a rule, the term "mining" includes the recovery of oil and
gas from wells as well as coal, iron ores and other useful minerals
from the earth.
2. The increased use of mining machinery has greatly contributed
to raising labour productivity and improving working conditions.
3. It is quite obvious that the problem of depth is not always
taken into consideration in choosing the mining method.
4. Productive workings are usually used for the immediate ex
traction of useful mineral.
5. Underground workings are driven in barren rock or in mineral.
6. A shaft is a vertical underground working which is long and
deep in comparison with its cross-section.
7. The surface above the mine working is usually called the floor.
8. The rock surfaces at the sides of mine workings arc called the ribs.
9. Ответьте на следующие вопросы:
1. What is mining?
2. What has contributed to the better working conditions of the
miners?
3. What factors influence the choice of the mining method?
4. In what case is useful mineral worked by open pits?
5. Are exploratory workings driven with a view to finding and proving
mineral or are they driven for immediate extraction of mineral?
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UnitS
6. What is the difference between development and production
work?
7. What main factors are used for classifying mine workings?
8. What do the dimensions of production faces depend on?
10. а) Найдите • правой колонке русские эквиваленты следующих слов и сочетаний слов:
1. direct access to the surface
2. open-cast mining
3. tabular (or bedded) deposits
4. oil well
5. underground workings
6. cross-section of a working
7. production face
8. the roof of the mine working
9. to drive mine workings in
barren rock
10. to affect the mining method
а) нефтяная скважина
б) проходить горные выработки по
пустой породе
в) влиять на метод разработки
г) прямой доступ к поверхности
д) пластовые месторождения
е) открытая разработка
ж) поперечное сечение выработки
з) подземные выработки
и) очистной забой
к) кровля горной выработки
6) Найдите в правой колонке английские эквиваленты следующих слов сочетаний слов:
1. способствовать чему-л.
2. размер ствола
3. извлекать, добывать (уголь)
4. штреки и квершлаги
5. пустая порода •
6. вообще говоря
7. удалять, перемещать (крепь,
вскрышу и др.)
8. с целью...
9. подготовительные работы
10. мощность пласта
а) thickness of a seam
б) shaft dimension
в) with a view to
г) to contribute to smth.
д) development work
е) to remove (timber, overburden,
etc.)
ж) drifts (gate roads) and crosscuts
з) generally speaking
и) to recover (coal)
к) waste (barren) rock
11. Подберите из списков А и Б близкие но значению слова:
А-
1. improve
2. rank
3. ensure
4. use
5. tabular
6. crop out (outcrop)
7. barren rock
8. quarry
9. influence
10. rib
11. size
12. broadly speaking
13. take into consideration
Б.
а) bedded
б) take into account
в) make better
r) waste (country) rock
д) expose
е) affect
ж) generally speaking
з) apply
и) open pit к) dimension л) side м) grade н) guarantee
Unit 8 __________________________________ 195
12. Переведите предложения, обращая внимание на перевод условных
придаточных предложений и союзов:
1. If the geological and prospecting indications are known, it is
possible, even before prospecting proper begins, to forecast not
only the type of economic deposit that may be found in the given
conditions but also the associated elements and the whole complex
of forecasting minerals.
2. Provided the geologists make use of proper prospecting
methods, they will get necessary results.
3. On condition that different types of ores are to be tested
separately each sample should represent a definite type of ore.
4. Unless the face is directly connected to the upper level, the
combine does not cut the face for its whole length.
13. Заполните пропуски соответствующей формой глагола в скобках:
1. Unless metamorphic rocks (to be studied) carefully, geolo
gists cannot be sure of their origin.
2. If the mass of magma (to be) large, the rate of cooling will
be slow.
3. If the earth (to be made) of the same material from the sur
face downward, its density would vary with pressure.
4. Provided geological conditions permit, efficient coal face
operations (to be) possible.
5. We really will not survive unless we (to start) working on
cleaner, safer sources of energy.
6. If you learned to type, you (to find) the job quite easily.
7. If he were here, I (can explain) to him myself.
8. They would have been here by now if they (to catch) the
early train.
9. I (not to believe) it possible, if I hadn't seen it happen.
14. Соедините главные предложения с придаточными:
1. It is possible to use trenches a) provided at some distance
for exploration from the floor there is
a waste bed which must be separated from mineral.
2. Mine workings are considered 6) if the latter is blended with
to be productive bituminous coal.
3. Rock will not easily cleave в) on condition that the
thickness of overburden is small.
UnitS
4. A bedded deposit is to be r) unless its schistose structure
worked by underground is disturbed.
mining
5. Bituminous coal will improve д) if they are driven with a
coking quality of anthracite view to extracting useful
mineral.
6. The cutter-loader will cut coal above the floor
e) if it lies at a great distance from the surface.
