Triangulation Method Crime Scene . Measurements are taken from two fixed areas at right angles of each other. In most cases, indoor scenes are shot using a variation of the baseline method, known as the 90 degree method. PPT THE CRIME SCENE PowerPoint Presentation, free download ID4047902 from www.slideserve.com The crime scene sketch is a simple line drawing that indicates the position of the body in relation to fixed and significant items in the scene (ex: The method requires two fixed reference points to locate the position of objects. Measurements are recorded from each reference point to the evidence location.
What Is Bord And Pillar Mining Method. One of the oldest methods of mining is the bord and pillar. Numerical study on an applicable underground mining ,keywords:
Design of Bord and Pillar method in coal mines from www.slideshare.net
Bord and pillar method of mining is one of the oldest methods. September, 1967 journal of the south african institute of mining and metallurgy. The egat mae moh mine is the largest.room and pillar mining method,room and pillar is a common mining method mining ore bodies with a dip less than 50 degrees.
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.
In many bord and pillar mines that are nearing closure, the pillars are taken out, starting at the farthest point from the mine haulage exit, retreating, and letting the roof come down upon the. It is a method in which the mined material is extracted across a horizontal plane while leaving pillars of untouched material to support the overburden leaving open areas or rooms underground. Evaluation of bord and pillar mining of bord and pillar mining system in mcl coal mines a thesis submitted in partial fulfillment of the requirements for.
In Nsw The Size Of The Pillar Is Restricted To A Minimum Of 1/10 Of The Depth, And The Width Of The Bord To 5.5 M.
This diagram shows the traditional method of bord and pillar mining. Currently, most of the production is still done by r & p. The roof can often require high lift equipment for appropriate inspection.
Numerical Study On An Applicable Underground Mining ,Keywords:
Bord and pillar mining method comprises two phases i.e development and depillaring. In the 70s in the usa, over 50% of production (underground) coal came from this method. The size of the pillars and headings driven during the first working stage is restricted by statutory requirements of a particular state.
Practical Importance Of The Room And Pillars Method:
A method of designing bord and pillar workings — m. Introduction in india, about 98% of underground output of coal is obtained by bord and pillar method and barely about 2% by longwall methods. Design of bord and pillar working;
Underground Mining Bord And Pillar.
It is commonly used for flat or gently dipping bedded ores or coal seams. The other countries where bord and pillar method predominates are australia, the usa and south africa. • a seam free from stone or dirt bands.
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