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bord and pillar mining method in guam

Jun 01 2017 · Bordandpillar mining is used in first workings of a deposit and when irregularly shaped deposits or sensitive environmental conditions call for a lighter touch This method is used at ... As a leading global manufacturer of crushing equipment, milling equipment,dressing equipment,drying equipment and briquette equipment etc. we offer advanced, rational solutions for any size-reduction requirements, including quarry, aggregate, grinding production and complete plant plan.

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  • Manganese Ore Crushing Project in South Africa

    Manganese Ore Crushing Project in South Africa

    Manganese Ore Crushing Project in South Africa is composed of coarse mobile crushing station including GZD1300×4900 vibrating feeder and PEW860 euro jaw crusher, medium and fine mobile crushing and screening station including HP300 cone crusher and 3YK186

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  • Bordandpillar mining explained  Illawarra Mercury

    Bordandpillar mining explained Illawarra Mercury

    Jun 01 2017 · Bordandpillar mining is used in first workings of a deposit and when irregularly shaped deposits or sensitive environmental conditions call for a lighter touch This method is used at

  • Bord and pillar mining – Coal and coal mining – Te Ara

    Bord and pillar mining – Coal and coal mining – Te Ara

    This diagram shows the traditional method of bord and pillar mining Miners first extracted coal along roadways or bords while the coal in between the bords acted as pillars holding up the roof Then the outer pillars were mined leaving the roof to collapse in a controlled way as miners retreated to the exit

  • Bordandpillar mining in inclined orebodies

    Bordandpillar mining in inclined orebodies

    mechanized bordandpillar mining layout for a given piece of ground Vlakpoort and Moddergat using a given selection of machines This piece of ground contains the PGM bearing UG2 Reef with an average thickness of 124 cm and dipping at 18° with adverse strike and dip changes Two bordandpillar layouts were designed for this area

  • Bord and pillar applications on the platinum mine Tcut

    Bord and pillar applications on the platinum mine Tcut

    The Tcut mining method is basically a partial pillar extraction method The pillar 13 m x 13 m created by the bord and pillar development is being stoped only the UG2 reef out for 2 m from the roadways on all sides to leave an effective pillar of 9 m x 9 m

  • Design of Bord and Pillar method in coal mines

    Design of Bord and Pillar method in coal mines

    Feb 27 2016 · BASIC PRINCIPLE OF BORD AND PILLAR METHOD When the gallery are developed a solid block of coal is left sourrounded the gallery are known as PILLAR The coal pillars formed are extracted after the development of the mine leasehold and this later stage of extracting coal from pillars is known as depillaring

  • PDF Underground Mining Methods Room and Pillar method

    PDF Underground Mining Methods Room and Pillar method

    Room BordandPillar Layout Figure shows Room and Pillar Mining For flatlying deposits ie deposits following rock strata the Room Pillar mining method is the most widely used In

  • Case studies of tendon support design in Bord and Pillar

    Case studies of tendon support design in Bord and Pillar

    Southern African underground Platinum and Chrome Mines exploit the tabular platinumand chromebearing orebodies using either conventional mining methods making use of jackhammers and air legs mechanized bordroom and pillar mining layouts or a

  • Roomandpillar mining  coal mining  Britannica

    Roomandpillar mining coal mining Britannica

    In coal mining Mining methods classified into four distinct categories roomandpillar longwall shortwall and thickseam Read More openstoping methods In stoping A common openstoping method is roomandpillar mining in which pillars of ore are left standing to support the rock over a flatlying ore body Read More

  • EVALUATION OF BORD AND PILLAR MINING SYSTEM IN

    EVALUATION OF BORD AND PILLAR MINING SYSTEM IN

    Bord and Pillar method of mining is one of the oldest methods of mining The success of Bord and Pillar mining is selecting the optimum pillar size If the pillars are too large then the extraction ratio decrease leading to less production and profitability and if the pillars are too small it becomes venerable to human safety

  • Bord and pillar mining – Coal and coal mining – Te Ara

    Bord and pillar mining – Coal and coal mining – Te Ara

    This diagram shows the traditional method of bord and pillar mining Miners first extracted coal along roadways or bords while the coal in between the bords acted as pillars holding up the roof Then the outer pillars were mined leaving the roof to collapse in a controlled way as miners retreated to the exit

  • Mining Funda Bord and Pillar method of Mining

    Mining Funda Bord and Pillar method of Mining

    Nov 21 2019 · Bord and pillar mining method comprises two phases ie DEVELOPMENT and DEPILLARING Sometimes both these phases proceeds simultaneously In development pillars are formed by driving a network of galleries of which one set is generally parallel to the dip and the other set is parallel to the strike cutting the former at right angles

  • Bord and pillar applications on the platinum mine Tcut

    Bord and pillar applications on the platinum mine Tcut

    The Tcut mining method is basically a partial pillar extraction method The pillar 13 m x 13 m created by the bord and pillar development is being stoped only the UG2 reef out for 2 m from the roadways on all sides to leave an effective pillar of 9 m x 9 m This method creates the required higher extraction percentage and higher Run of

  • Case studies of tendon support design in Bord and Pillar

    Case studies of tendon support design in Bord and Pillar

    Southern African underground Platinum and Chrome Mines exploit the tabular platinumand chromebearing orebodies using either conventional mining methods making use of jackhammers and air legs mechanized bordroom and pillar mining layouts or a

  • PREVIOUS AND CURRENT MINING METHODS

    PREVIOUS AND CURRENT MINING METHODS

    Mining method and equipment 421 General The bord and pillar mining layout will be maintained because of its reliability flexibility low capital cost low working costs and large skills source availability Woodruff 1966 Increasing mechanization has resulted in

  • PDF Roomandpillar panel design method to avoid

    PDF Roomandpillar panel design method to avoid

    The roomandpillar mining method is widely used in many coal producing countries including the US China India and South Africa 1234 and accidents due to falls in bord and

  • MINING METHODS T  cmpdi

    MINING METHODS T cmpdi

    working height leaving the pillar core as a natural support to the roof Over 45 overall large percentage of the total coal reserves in India The prevailing method of bord and pillar mining was inadequate as recovery was low and required stowing with sand not easily available in

  • Criteria for selection of Board and pillar for multiple seams

    Criteria for selection of Board and pillar for multiple seams

    Nov 06 2016 · In India about 98 of underground output of coal is obtained by Board and Pillar method and barely about 2 by longwall methods The other countries where Board and Pillar method predominates are Australia The USA and South Africa 5 Page 4 FIGURE3 BOARD AND PILLAR PANEL LAYOUT Classification of Bord and Pillar Mining System 1

  • Sizing of Final Stumps for Safer Pillar Extraction

    Sizing of Final Stumps for Safer Pillar Extraction

    information regarding the method of pillar recovery and the sequence of mining pillars ¶75221a8 Pillar recovery criteria and specific criteria to be considered in the approval of the pillar recovery portion of the plan are identified in two sections of the standard Section ¶75207 discusses the use of breaker

  • Digging deeper Mining methods explained  Anglo American

    Digging deeper Mining methods explained Anglo American

    The underground mining methods we use include room and pillar narrow vein stoping and largescale mechanised mining Room and pillar mining is a style of mining where tunnels are driven in a chess board pattern with massive square pillars between them which are gradually cut away as the work proceeds We use this for mining coal

  • Bordandpillar  Definition of Bordandpillar by Merriam

    Bordandpillar Definition of Bordandpillar by Merriam

    Bordandpillar definition is of or relating to a system of coal mining in which tunnels are driven in a checkerboard pattern having massive square pillars between them

  • Seriously Contentious  Coal Colliery and Mining Forum

    Seriously Contentious Coal Colliery and Mining Forum

    Jan 09 2016 · Mining Methods and Geology Long and Shortwall mining Bord and Pillar Methods Other Minerals Opencast Mining Geology Rules and Suggestions Information About Registrations Guam American Virgin Islands etc I like the definitions of Employer and Employee best An Employer is the federal government a political party or subdivision

  • PTM considers transition to hybrid mining method at Maseve

    PTM considers transition to hybrid mining method at Maseve

    The proposed change in the primary mining method will result in a move away from the current highervolume mechanised bordandpillar mining method to a

  • Coal Mining Methods  Colorado School of Mines

    Coal Mining Methods Colorado School of Mines

    Coal Mining Methods Underground Mining Longwall Room and Pillar Mining Longwall mining and roomandpillar mining are the two basic methods of mining coal underground with roomandpillar being the traditional method in the United States Both methods are well suited to extracting the relatively flat coalbeds or coal seams typical of

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