- •Gold mining
- •Text 1. Some facts from the history of gold mining
- •Diamond Placer
- •Text 3. La paz placers
- •Text 2. Placer mining вy excavating machinery
- •Fig.1. Ruston-Bycyrus dragline excavator
- •Fig. 2. Dragline making first cut
- •Fig.5. General arrangement of property for dragline mining
- •Text 3. Power shovels
- •Cableways
- •Text 4. Excavating equipment in тнe mid 80s
- •Electric mining shovels
- •Hydraulic excavators
- •Fig. 13. Ransomes and Rapier w2000 walking dragline stripping overburden at phosphate mine in Jordan
- •Fig. 14. Shows the rh120c introduced in 1933 as an intermediate size between the rh75 and rh300, incorporating “Tripower" geometry
- •Text 2. Dredging in the north
- •Stripping
- •Dredging
- •Vocabulary
- •Text 3. Thawing
- •Other operating problems
- •Nodules
- •20° Angle Gave Best Results
- •Fig. 17. Nodule dredge configuration shown was chosen after a series of increasingly complex dredge designs
- •Larger Dredge Lines Cause Problems
- •Dredge Vessel Specifications
- •Ship Positioning By Dead Reckoning
- •10 Tpd Average
- •Fig. 18. Stages in mining diamondiferous gravel
- •Transport
- •Milling
- •Effects
- •What is Cyanide?
- •Prevention/Solution
- •Text 2. Sluicing
- •Sluice Boxes
- •Water Required
- •Tailings
- •Text 3. Excavation and treatment of gravel
- •Fig. 29. Sluicing by direct loading method
- •Fig. 30. Method of working with ample water supply and steep valley
- •Text.2 working of terrace and alluvial deposits
- •Fig. 33. Method of working river terrace and eluvial deposits
- •Fig. 34. Example of exploitation plan
- •Text 2. Hydraulic mining
- •Fig. 35. Sketch of giant or monitor
- •Text 3. Hydraulic elevators
- •Fig. 41. Hendy hydraulic gravel elevator
- •Fig. 42. Section of elevator pit (Joshua Hendy Iron Works)
- •Text 4. Sluice boxes for hydraulicking
- •Text 2. Miscellaneous methods of mining
- •Text 3. Khetri copper complex
- •Text 4. Kherti and kolihan mines
- •Fig. 46. Longituainal section of Kherti mine, showing principal shafts, main levels and stoping areas
- •In Kolihan mine, small footwall ore-shoots are worked by a sub-level top-slicing method using jackhammers and remote controlled Cavo loaders.
- •Shafts at the Kherti and Kolihan mines
- •Fig. 48. The service shaft, Khetri mine
- •Central services
- •Personnel and housing
Personnel and housing
The Khetri Complex employs some 8600 persons, distributed amongst the departments.
The underground mines, concentrator, smelter and refinery are all operated on continuous three-shift systems, plus a general day shift.
The majority of workers live in the township of Khetrinagert, which has a population of 25000. The company has provided nearly 4000 custom-built houses - a limited number of 4- 5- and 6-roomed houses, 850 3-roomed houses (in two types), 2250 2-roomed houses, and 780x with single rooms. There are also some 200 units of hostel accommodation available.
In the township there is a 200-bed hospital, two clinics, six primary and three secondary schools, community clubs, tennis courts and cinema.
COMPREHENSION CHECK
Exercise 23. Fill in the missing words.
Both mines have a central ... ... In the Khetri mine this extends ... 350 m level ... the 0 m level.
Sumps are provided ... the 0 m, 180 m, 300 m ...
Main exploratory levels are driven ... 3.5 m x 3 m section, 30 m ... the ore either ... the hanging wall or footwall.
Drilling ... a large diameter long hole is carried ... using an Indian- made WDS-400 drilling rig.
Broken ore ... the sub-level stopes is extracted ... cross-cut draw points.
Exercise 24. Match the parts of the sentences.
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Exercise 25. Complete the sentences based on the information from the text.
Khetri is located ...
The next level, 350 m is a tracked level served by …
Ore is loaded here by means of ...
Each stope is developed from ...
Recently large diameter blast hole stoping has been successfully introduced in Kolihan mine using ...
SPEAKING
Exercise 26. Make questions to the sentences and ask them the partner.
The Kolihan workings are located on three lodes and extend over a total length of 600 m.
Drilling of large diameter long holes is carried out using either an important Mission Megadrill or an Indian-made WDS-400 drilling rig,
Foth mines have a central ore pass system.
The water inflow to Khetri mine amounts to some 150000 m3/month.
Main ventilation is provided at Khetri mine by a 175 kW Sirrocco axial flow fan at the production shaft.
Exercise 27. Discuss the questions with the partner.
Какова длина простирания месторождения?
Какие интервал между горизонтами шахты.
Какой метод используется здесь?
Каким способом производится погрузка руды на 6eзрельсовом горизонте?
Какой ежемесячный приток воды в шахтах Кетри?
Чем обеспечивается вентиляция в Кетри?
Какое количество добываемой в день руды и пустой породы в Кетри?
Что является источником питьевой воды в Кетри?
Имеются ли здесь мастерские по ремонту оборудования?