27. Укажите, какие предложения соответствуют содержанию текста. Подтвердите свои ответы фактами из текста.

1. Ore deposits may be called economically workable natural concentrations of minerals.

2. It is quite enough to take into consideration the shape of the deposit for choosing its method of working.

3. The thickness of ore deposits is a constant value.

4. As a rule exploration provides information for mining.

5. Equipment of various types and capacities is readily available for rock excavation and it includes power shovels, backhoes, draglines, bucket wheel excavators, etc.

6. After mining or dredging ores are usually processed, crushed or dried.

Unit 9 231

28. Ответьте на следующие вопросы:

1. What minerals do we usually call economic?

2. Is the type of ore the only factor which the engineer takes into consideration in choosing the methods of working ore deposits?

3. What does a rational method of mining guarantee?

4. What does before mining activity include?

5. What processes does development work involve?

6. What basic sloping methods are in use now?

7. What are the main methods of working bedded deposits?

8. Is underground or open-cast mining preferable now? Why?

9. Can you give a few examples of the largest enterprises producing ores in the country?

29. Найдите в правой колонке русские эквиваленты следующих слов и со­ четаний слов:

1. block caving а) породный отвал, терриконик

2. crushing and diving б) открытые горные работы, вскрыша

3. power shovel в) блоковое (этажное) оборудование

4. grabbing г) дробление и сушка

5. to range (from ... to) д) врубо-погрузочная машина, горный

6. remote control комбайн

7. shrinkage sloping e) колебаться (в определенных пределах)

8. waste heap ж) погрузка грейфером

9. cutter-loader з) дистанционное управление

10. Overcasting and side- и) выемка системой с магазинированием

casting к) механическая лопата, экскаватор

11.Stripping operations л) перелопачивание и внешнее

отвалообразование

30. Заполните пропуски приведенными словами:

а) load loader loading

1. Mining machines which break out coal or rock from the face and ... it on the face conveyer are called either cutter-...s or tunnelling machines.

2. According to the classification the mining machines are divided into three main groups: for breaking rock, for ... and transporting and setting supports.

б) cut cotter cutting

1. ...s are designed for cutting coal and other minerals, including rock salt, potash, tuff, limestone, etc.

2. The ... mechanism of a coal-cutter may be a disk or a chain.

3. The cutter can ... minerals of varying thickness.

232

Unit 9

31. Подберите из списков а и б близкие по значению слова:

А. Б.

1. lorry a) spoil heap

2. slope б) user

3. waste heap в) excavator

4. consumer r) truck

5. dumping д) restrict

6. earth-mover e) excavator

7. surface mining ж) tip

8. limit з) open-cast mining (strip mining)

9. power shovel и) roof timbering 10. roof support к) face

32. Определите, какой частью речи являются выделенные слова. Пере­ ведите предложения: ,

1. There exist various types of electric drills which are in use in rocks of different hardness.

2. To increase drilling speed, modern drill bits (коронка) are covered with hard allpy (сплав).

3. Using electric rotative drills it is possible to drill holes into coal and soft rock such as soft shales.

4. The Donbas cutter-loader wins and loads coal of low-to- medium hardness and anthracites in gently sloping seams under a roof of average strength.

5. Scraper conveyers can convey great loads per hour.

6. As a measure of safety the shields protect face personnel and equipment from falling rock.

7. For the measurement of the pressure and speed of air there are special barometers which measure the absolute pressure of air.

8. The drills for making holes have handles.

9. It is rather difficult to handle the equipment underground.