Longwall mining

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This presentation gives you an insight into the status of longwall mining in india.

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Longwall mining:

Longwa ll mining Status in India and its application for deep seated deposits in international scenario

Contents::

Contents: Longwall : Introduction LW mining equipments LW mining : Importance Status in India Analysis of the problem Present and Future

Introduction :

Introduction This is a form of underground coal mining where a long wall of coal is mined in a single slice (typically 0.6–1.0 m thick). The Longwall panel (the block of coal that is being mined) is typically 3–4 km long and 250–400 m wide. As a cut or slice is taken along the length of the wall, the supports are collapsed, advanced closer to the face, and re-engaged, allowing roof to cave behind.

Equipments:

Equipments Powered Face Supports

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Shearer

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Armored Face Conveyor

Few Scenes from a Longwall mine :

Few Scenes from a Longwall mine

LW mining: importance:

LW mining: importance Present ratio of production: UG : OC = 20 : 80 The reserves suitable for OC mining are gradually depleting . To meet the future coal demand we need bulk production underground technologies. The present UG mines are operating at depths of 350m and the future extraction is from deeper horizons(300-600m).

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LW Mining Higher extraction I ncreased safety Suitable for thick seams Better for deep seated mines Higher Quality of coal

Status In india:

Status In india

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Indian coal industry’s experience with LW has been somewhat mixed . Between 1978 and 1987, nine LW packages were deployed to extract some 5.4 million tons of coal in Jharia, Raniganj, Satpura and Godavari Valley coalfields.

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The experience from the first generation Longwall faces was not encouraging. Average production at Moonidih was around 750 tpd while Dhemo Main and Pathakhera gave around 550 tpd However , SCCL achieved around 1500 tpd . The production from about twelve operating mechanised Longwall faces in India was just 1.15 million tons in 1993-1994 utilisation factor of man and machine was within just 26%-35%.

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ANALYSIS OF THE PROBLEM Geo-mining Conditions Faulty Planning Improper Selection Management of Face Longwall Support Selection Deficiencies Large expansion in opencast mining Research needs

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PRESENT ACTIONS AND FUTURE NEEDS Planning Standardisation of Equipment Spare Parts Management Monitoring of Performance Workshops and Overhauling Facilities Indigenisation Manpower Development

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Thank You!

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