Karasawa Mine Home page

Wellcome !


Location

1765,Aisawa,Kuzuu Town,Aso-Gun,Tochigi Pref.JAPAN
Tel 0283-86-2281 Fax 0283-85-3495

From Kuzuu Station (by Tobu-Sano line) 10min by car


Products

(Limestone & Dolomite)
Raw material for cement 2,000,000 t/y
Aggregate................................1,500,000 t/y
Dolomite......................................700,000 t/y
Total..........................................4,200,000 t/y

Ore Resevation more than 300 million tons


History

1937 Established as limestone quarry
for Tochigi cement plant of Fukoku Cement

1963 Changed into Karasawa Mine of SumitomoCement Co.,Ltd.

1981 Capsule Liner system established
Aggregate Plant established

1986 B5-shaft completed
B5 Face installed

1994 Dolomite Plant established


Mining


Mining Area (B5 face) is more than 100,000F

Drilling machines are used to make blasting hole.
The holes have a diameter of 165mm or 102mm and a depth of 15m.

ANFO is used as a explosive.

Loosing limestone is loaded Dump trucks by Loading shovel or Wheel loader.
Limestone for cement is hauled to shaft ,for aggregate and dolomite is hauled to each plant.

Main equipment for mining is shown as follows

Drilling machines

DM-45 Bit size 165mm Ingersoll-Rand
CDH-951C Bit size 102mm Tokyo-Ryuki
HCR-C300 Bit size 75mm Furukawa Co

Loading machines

EX1800 10.5G HITACHI
WA800 10.5G KOMATSU
988B 5.0G CAT

Dump trucks

HD785~2 78t KOMATSU
HD465~7 46t KOMATSU

others

EX400 Power shovel HITACHI
MKB1400 Breaker
D155A Bulldozer KOMATSU


Limestone (raw material for Cement plant) Plant

Capsule Liner system

Capsule liner is transport system using compressed air.

The capsule consists of two five-wheel units one at each end-mounted on a capsule body which is open at the top.
The body is divided into three sections with three bottom lids for discharging limestone. Each capsule is fitted with seals at each end to ensure adequate aerodynamic drag and minimise blow-dry losses. The seals consist of circular disc with its circumference fitted with a flexible seal with narrow clearance to the inside diameter of the pipe.
The train consists of three capsules linked together with each end of the train fitted with a horizontally installed hydraulic shock absorber to reduce the impact originating from the connection of trains at the stations. A connector engages on impact and thus prevents recoil.
The steel pipeline is 3.18km long and measures 0.998m in diameter.
The pipeline runs mainly underground, apart from the loading and unloading stations.
The limestone is fed into a hopper which discharges its load on a batcher turntable.
The turntable has an annular disc with threee batchers, and its bottom lid opens and its content is dropped into the capsule.
The three capsule trains are propelled through the pipeline by blowers installed at the end of the line and air current in the line forces the capsules to move and these shoot down the pipe with an operating speed of up to 30 km/hr.
Arriving at the unloading or loading station, trains are slowed down in the braking zone located between the two air outlets as subsequent trains previously decelerated create the required back-pressure.
PCs control these equipment so that it is possible to operate by one man.


Aggregate Plant


Primary Crushers

48-60 ST-Jaw Crusher@700/hr
54-74 ST-Jaw Crusher@700/hr

Secondary Crushers

Impact Crusher PEH3-160/210
Gyratory Crusher

Other Crushesr

2 1/2-45 Corn Crusher
SandPact PES-3
Pebrus

Maintained by Yoshitomi IsaoFisao_yo@st.rim.or.jp