Indian Copper Complex - Old History

The mines and method of stoping may not exist, But will remain in the History and reference books.     Picasa Web Albums - hrdngnair - ngnair.

INDIAN COPPER COMPLEX. Important copper mines in eastern India are located in the Singhuhum district of Bihar near Tatanagar. They were earlier owned by private company, Indian copper corporation, Ltd. but were nationalized in 1972 and become the production units under Hindustan Copper Complex, a Division of HCL, now has administrative control over the copper mines like Mosaooni (oldest and the largest), Pathagora, Surda, Kendadih and Rakna, a copper smelter at Moubhanoare, a kyinite mine at Lopsoouru and the concentrators located neare the mines. 
In the copper bearing areas of Singhbhum the predominan economic mineral is chalcopyrite associated with lesser amounts of pyrites, pyrrhotites and pentlandites. The country rock in the mines in the hanging wall and in the footwall are hard compact granite, granite schist and quartz chalorite / biotite schist. The copper belt extends over a wide area but the ICC is exploiting copper deposits ranging over a strike length of 20 km. Mosboni mine, the largest unit, has reached a depth of nearly 1300m and the copper ore still persists in the normal way at that depth. 
In the region of the main shafts at the Mosaboni mines the general dip of the orebody is around 20 degrees to the north east. There are two more or less parallel lode structures, the upper of which is known as the Main Lode and the lower, which lode. Payable zones in the two lodes tend to lie en-echelon with each other, so that they are rarely superimposed one upon the other. Lode width varies from under 0.5 m upto 24 m. The currently estimated reserves in the different deposits on HCL’s lease area are given in Table 1. the cut-off grade employed in making these estimates is 0.5 % Cu. The average head grade of ore to the concentrators is now 1.12% Cu. 
Mosaboni mine has been developed over a strike length of 4.6 km to a depth of nearly 1.3 km. access to the underground workings is for the most part through inclined shafts, the exceptions being the Annan shaft at Badia mine, circular shaft at Mosaboni mine, No.# shaft at Surda mine (all of which are vertical and the access to Kendadih, which is by adit. Generally, the levels have been established at vertical intervals of 37.5 m. The orginal Main Shaft at Mosaboni serves the top 12 levels of the mine. Leves 12 to 20 are served by the No.1 sub-incline shaft, and levels 20 to 30 by No. 2 sub-incline. (Details in Table 3)
Copper Deposit reserves in the ICC, Lease area as at June, 1983. Picasa Web Albums - hrdngnair - ngnair.

Mine/Deposit

Proved Mte

Probable Mte

Poss’ble Mte

Total Mte

Grade % Cu

Mosaboni

11.24

3.78

4.74

19.77

1.70

Pathargora

1.84

0.44

0.49

2.77

1.44

Surda

12.24

5.37

7.63

25.24

1.21

Kendadih

8.83

3.02

3.15

15.00

1.76

Rakha-Phase 1

8.80

-

-

8.88

1.20

 Sub total



 

 

71.66

 

1.47

Available deposits Rakha (Roam) Phase II

27.79

18.77

-

46.56

1.25

Chapri sideshwar

17.85

20.95

-

38.80

1.40

Tamapahar

-

9.82

6.30

16.12

1.40

 

Sub total

 

 

 

 

101.48

 

1.33

 

Total for HCL Lease

 

 

 

 

173.14

 

1.38

 PRINCIPLE SHAFTS, Indian Copper Complex MINES, Picasa Web Albums - hrdngnair - ngnair.

Shaft

Inclination

(Degress)

Dimentions

(m)

Vertical Depth (m)

Hoist KW

Pay load (te)

Mosaboni

 

 

 

 

 

Main Shaft

38

4.75x1.7

399

335

4.5

No. 1 sub-incline

25

5.18x1.6

332

224

4.0

Pilot Shaft

28.35

3.6x1.7

334

112

2.0

No. 2 sub-incline

25

-

413

560

8.0

Circular shaft

Vert.

4.88 dia

685

500

4.5

Annan shaft

Vert.

4.10x1.8

219

112

1.4

Pathargorn

 

 

 

 

 

Main Shaft

40

4.10x1.8

385

135

3.0

Surda

 

 

 

 

 

No 3 shaft

Vert.

4.10x2.4

160

75

1.5

No 4 shaft

40

4.40x2.0

255

400

 

Sub-incline

31-35

4.4x1.7

303

131

4.0

Rakha

 

 

 

 

 

No 4 Shaft

53 40

5.00x2.5

180

400

4.0

No 5 shaft

40

5.00x2.5

180

220

4.0

 All shafts have steel framed headgears, and all are used for both ore hosting, general access and service.

All hoists are double drum, electric.      Development - Essentially the same methods of development and stoping are in use at all the mines. Some 20% of development work – principally crosscuts and orepass – is in waste rock, while 80% - mainly haulage levels, raises and a few winzes – is in ore.

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