Mining Classroom

INTRODUCTION Longwall Mining Method is a very popular method of Coal Mining. It is widely in all over the word. In this method, mining is done below the ground by forming a long face(60 to 200m). The production of Longwall Mining Method is by Shearer Machine. It is maintain a continuous line of advancement leaving behind a goaf or void. The roof is supported by packing the packing of stand or other crushed stone(partially or completely) to prevent collapse. Only a few meter is left from face (up-to 3 to 6m) and it is supported by timber, steel props, bars or chocks.  ADVANCING I n Longwall Advancing, the extraction of coal is from the vicinity of shaft and advance towards the boundary of mine. Face is approached by parallel roads. The over may support by sand or pack wall or allow to cave in. RETREATING  In Longwall Retreating pair of headings are in solid coal at certain interval to the pre-determined boundary. The extraction of coal is from the bo...

Bord and Pillar Method of mining involves in the formation of roadways and the development of Mines. The first stage of working of Bord and Pillar Method is Called Development. In the development stage parallel roads are driven nearly at right angle to the first set. These roads are also use to join the separated coal blocks. The network of roads regularly increases as development of the mine. The second stage of working of Board and Pillar Method  of mining is called Depillaring. The Depillaring can be understood by It's name(De-Pillaring). In Depillaring the working involves in the extraction of coal from the Pillars. These are two stages of this mining method. The another name of Bord and Pillar method is "Pillar and Stall". For the application of Bord and Pillar Method there are some conditions to be full filled. Conditions are.... •The thickness of seam seam should be more than 1.5m. •There is less amount of dirt bands present in seams. •Se...

Opencast Mining is a Mining which open to sky. This mining is also called open-pit, quarry, strip mining. This mining is much easier than Underground mining. It is involves in removing of the upper layer of alluvium or rocks or both to reach the Mineral bed. In this method the minerals are completely removed. Further it is done in the following types... 1. Manual Quarrying :- The manual labour are employed who drills holes form 1.2m to 1.8m and 37mm of diameter by handheld drillers. The low explosive like gun-powder are used. The loading is to do by manual loader into tubs. The rope haulage or locomotives are used for transportation. 2. Mechanised Opencast :- In this method the holes are of 6m to 18m deep and diameter of 125mm to 250mm. Higher explosives (Liquid oxygen, opencast gelatin etc.) are used. The transportation is by the mean of locomotives, belt conveyor or dumpers are used. In mechanised Opencast mining huge machine are use. They are dragline, bucket wheel excavato...

In this post you will get some knowledge about the mining methods. Let's start... The mining is generally divided into two types... 1.Opencast Mining              & 2.Underground Mining Further the underground mining is mainly divided into two types... They are a.Board and Pillar mining                                    &                  b.Longwall Mining                     Opencast Mining The opencast mining is that type of mining which is directly open to sky or every work is done directly under to the roof of sky. The working of opencast mining involves the formation of bench and the supervision of work is easy.                   Underground Mining The working which is below the ground surface i...