Mining Classroom

In this post we will deal about the Definition of Secondary Blasting and types of Secondary Blasting . Some other Blasting are also available you can read about that. So let's start... Definition of Secondary Blasting The technique used to blast the boulders to achieve the fragmentation is called secondary blasting. This blasting is done to get the rocks which can be easily handled. Why and how to do secondary blasting? Why secondary blasting? We does secondary, in case when the primary blasting don't give fragmentation of rock which can be easily handled. The secondary blasting is followed after the primary blasting. How to do secondary blasting? To do secondary blasting we have to follow some methods which will give us batter resultant. These are here 1. Plaster shooting or Mud Capping.. As name indicates mud capping, the primer cartridge is place at top of Boulder and covered with mud. The blasting is done from the safe place by electric detonator...

Q. What is shaft? Ans. :- It is a vertical or inclined entry made to touch seams. The word shaft is used for underground mining entrance. Q. Why shaft? Ans.:- The shaft is excavated after getting approval to mine the mineral bed by underground method of mining. Simple View of Working Shaft Shape of Shaft Generally the shaft are of circular in shape but in some mines it is of rectangular in shape. The circular shafts are best because they resist heavy side pressure and offers least rubbing surface area for ventilation. Bricking and concreting job are easy and diameter of these shaft may be varies from 4.2mts to 6.7mts. ◆The shaft sinking process is costliest and time taking process. So it is necessary to drill pilot hole within the radius of 50m of main shaft which has to be drill. This pilot hole give us an idea about the rock and how we have to encounter those problem which will we face during shaft thinking. From this we will get a data about       ...

What is rope splicing? Rope splicing is a method of joining wired rope for permanently. In this method special fitting or attachments are not used. Broken Rope Length Decided to splice •The strength of spliced rope is depends upon the length of splicing and friction between their interlocks. The length of splicing is directly proportional to diameter of rope. •For 6-9meters length, the diameter should be 13mm and for 10-15meter length,the diameter should be 25mm of rope. Q.How rope is spliced? Ans..Here we will discuss step by step the method of rope splicing. 1. Splicing of Lang's  Lay or Ordinary Lay rope. •Firstly we have to decide the length of splicing •Bring the two end of rope, after that we have to open the stands of rope up to twine binding then cut the fibre core. • In next step we have to cut the alternative strands of both end of rope up to about 30cm from the twin binding. • Now we have to bring the two faces of rope, so the cores met each ot...

Introduction The mines fires are classified differently depending upon their combustible material. So it is very needy to know combustible material and the extinguisher is use to extinguish the fire. The classification of fire is from class "A" to class "E". Let us know what are they and which types of extinguisher is to be used. Classifications •Class A fire: The combustible material are timber, coal, rubber, other carbonaceous materials.. Extinguisher  type: Water, sand, stone dust. •Class B fire: The combustible materials are lubricant, diesel, petrol, fuel, greases and other inflammable liquid. -Extinguisher type: Foam extinguishers are used which cuts down oxygen supply by blanketing over oil. Water is not used to quench because the  combustible materials are of oily nature, due to this they start flowing upon the and the fire will not stop. •Class C fire: The gaseous fuel are responsible for fire like LPG, CNG, etc.. -Extinguisher typ...