UNDER GROUND MINING METHODS (METAL MINES) BY N G NAIR, MANAGER (MINES)

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KHETRI COPPER COMPLEX AND MALANJKHAND COPPER PROJECT

KHETRI COPPER MINES, JHUNJHUNU DIST. RAJASTHN STATE, INDIA

Mining Technology – Raising Methods in Metal Mines by N G Nair Manager (Mines)

Malanjkhand and Khetrinagar – Mining Methods

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Khetri Copper Mines, Khetrinagar, Jhunjhunu dist. Rajasthan, India

TRAINING CENTRE, MALANJKHAND, MALANJKHAND COPPER PROEJCT

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HINDUSTAN COPPER LIMITED

Asif Daiyan Photo Album Sr. Mining Engineer Hindustan Copper Limited

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Long Hole Stoping/ Blast Hole stoping

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The level intervals is 60 – 70 m, the usual interval in most of the mines in India. Long hole, stoping has been tried for the first time in the early eighties at Kolihan Copper mines. The encouraging results and favourable economy of the expeiriemental stoping have encouraged the authorities to extend it to Kheti Copper Mines, as well. Long hole stoping is also known as blast hole stoping in the mines of Khetri Copper Complex. The details of the method of stoping as practiced at Khetri Copper Complex are given in the chapter on Copper Mining in this Section B later.

Long hole stoping is an improvement over drop raising, described earlier. In this method basically a drill is driven along the top of the stope block parallel to the strike and an undercut drift along the bottom is connected to an extraction drift with crosscuts. Stope height is usually 60 m depending upon the length of drill holes possible by the drill rig. Parallel blast holes, nearly 165 mm dia. are drilled to the undercut. These holes may be vertical or they can be adapted parallel to the dip of the orebody. An orebody with a dip of 50 degree to vertical can be mined proceeding in lifts longitudinally,. Orebody having a dip between 55 degree and 35 degree would be mined with a method transverse to the dip where they extraction drift for the stope above becomes the drill for the stope below.

The method involves crater blasting. In the method of sublevel stoping vertical slices are blasted to an open face (starting with a slot raise), but in the crater method horizontal slice of 1.8 – 2 m. The charging and stemming of the blast holes is on the same lines as mentioned for drop raising earlier. The blasted ore is removed from the drawpoints by rocker shovels or LHD vehicles to the haulage level.
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Surpac Mining Software Training at Training Centre, Malanjkhand Copper Project, India.
A Geologist from Copper Mines in India
Malanjkhand , Balaghat Dist. MP State, India
About Copper Mines in India by N G Nair

Saturday, October 6, 2007

N G NAIR MALANJKHAND - Manager (Mines) Hindustan Copper Limited

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