Like sublevel stoping and shrinkage stoping, vertical crater retreat (VCR) mining is applicable to mineralization in steeply dipping strata. However, it uses a different blasting technique breaking the rock with heavy, concentrated charges placed in holes (craters) with very large diameter (about 165 mm) about 3 m away from a free rock surface.
Modifying the mining method and introducing new, more powerful machines are actions Deposits with large vertical heights are mined in slices. Mining starts at the top below the hanging wall. At this stage, Underground Mining Methods and Applications .
Posts about vertical crater retreat (VCR) written by PARTHA DAS SHARMA Mining and Blasting Weblog of Partha Das Sharma For Discussing Various Aspects of Mining, Explosives and Blasting .
i. A blasting method employed in underground sublevel mining. Initially a vertical slot extending across the width of the stope is mined. The remaining portion of the stope is then blasted by section into the vertical slot following sublevel procedures.
a vertical seismic profile was acquired in the Lake Bosumtwi (Ghana) hard-rock core hole LB-08A. The Bosumtwi impact crater is a 1.07 Myr old impact structure thought to be the source of the Ivory Coast tektites (Koeberl et al. 1997). The impact structure is approximately Borehole seismology, the method employed in this study, is able
Borehole mining is a remote-controlled method of underground mining used to mine a broad range of natural resources and industrial materials. A borehole tool comprised of two pipesone that delivers a stream of high pressure water, and another that delivers slurry back up to the surfaceis used.
A vertical crater retreat (VCR), also referred to as vertical retreat mining, involves drilling large-diameter holes into the orebody vertically from the top of the mine, as opposed to the conventional blasthole stope method of drilling them in fans from bottom to top.
Introduction. This course refers to the generic mining method of sublevel stoping. The most commonly used sublevel stoping mining methods are sublevel open stoping, long-hole open stoping or blasthole stoping, and vertical crater retreat (VCR).
Mining method selection is a critical point and a strategic issue in the mining engineering vertical crater retreat mining (VCR), strip mining and novel extraction methods such as hydraulic mining and borehole mining. Moreover, underground methods such as longwall
The orifice should be stamped by soil for a length of about 60 cm. 3.2 Experimental test and data processing 3.2.1 Blasting crater volume survey Given the rule of vertical profiles, we design the plane, vertical to the axes of the borehole, as the daum plane and measure the original free surface beore and the distance between crater figure and
ratio of 15:1 (cylindrical charge) and again with a length-to-diameter ratio of 2.7:1 (spherical charge). While the crater radii were close in both cases, the crater volume was significantly different, being 1.1 m 3 for the former and 4.4 m for the latter.
Mine, Lead, SD, has demonstrated the usefulness of the finite-element method for evaluating shaft pillar mining plans and shaft stability. In this study, borehole extensometers and other instruments were installed to provide data
It is the only patented mining method (more correctly, a modern version of the method, vertical crater retreat-VCR, is patented). Sublevel stoping, also known as blasthole, longhole, open or VCR stoping.
Synopsis. Vertical Crater Retreat is compared to other open stoping methods. Various geotechnical factors have been considered including the effects of stress concentration, jointing, dynamic stresses superimposed by blasting vibrations, amount of development required and shrinkage draw.
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In Canada in 1975, mining company INCO developed a mining method based on Livingston's cratering theory. This method is called vertical crater retreat (VCR) or vertical retreat mining (VRM) method.
The invention relates to mining and can be used for the production of loose, granular, semi-grained minerals through the production well. Known widely used method of hydropobic construction, phosphorus, titanium, zirconium, uranium, gold sand, with depths mostly up to 100 meters, the production Method is the drilling of vertical wells with the opening of the reservoir of minerals, fixing the
Evaluation of Overhand Cut and Fill Mining Method used in Bogala Graphite Mines, Sri Lanka mining, slope mining, shaft mining, borehole process and Hard rock mining. vertical crater retreat, block caving and sub-level caving are some of the hard rock mining methods used around the world. 1.2 Mining Method in Bogala
Then the new blasting method developed into a new mining method called vertical crater retreat. Dilution of the ore by backfill material .. Drop raising eliminates these two practices and in doing so it provides greater advance and a safer working environment.
Sublevel stoping..Underground mining methods 1. Hassan Z. Harraz [email protected] 2014- 2015 This material is intended for use in lectures, presentations and as handouts to students, and is provided in Power point format so as to allow customization for the individual needs of course instructors.
A 4-year study was conducted of the rock mechanics aspects of two underground hard-rock mine study stopes: (1) Anaconda Minerals Company's Carr Fork Mine near Tooele, Utah, and (2) Homestake Mining Company's Homestake Mine in Lead, South Dakota. Large-diameter (6 1/2-in) blastholes were an integral part of the stoping method at each mine.
Vertical Crater Retreat: An important New Mining Method. Crater Blasting Method Applied to Pillar Recovery at Falconbridge Nickel Mines, Ltd. Cost Calculations for Sublevel Longhole Stoping. Cost Estimation for Sublevel Stoping. Shrinkage Stoping.
Outline of Topic 5: Shrinkage stoping Ascending method of mining Advantages and Disadvantages Vertical Crater Retreat stoping Introduction Application Developmental sequence of stopes Production How Cratering Works Prof. Dr. H.Z. Harraz Presentation Shrinkage & VCR stoping 2 We will explore all of the above in Topic 5.
Vertical crater retreat (VCR), also known as Vertical retreat mining, is an open stoping, bottom-up mining method that involves vertically drilling large-diameter holes into the orebody from the top, and then blasting horizontal slices of the orebody into an undercut.
VERTICAL CRATER RETREAT MINING IN THE SUDBURY BASIN Vertical crater retreat mining History The vertical crater retreat mining method is based on C.W. Livingston's crater blasting theories and was developed by Inco and CIL Inc. .
Underground Mining Methods and Design 09-Mmp-A2 May 2015 Page 3 of 13 Question 1.3 (7 marks) answer compulsory 1.3 General mine ventilation question. (7 marks) Describe methods for measuring air velocity in underground mines when the air velocity is; 1.3.1 Slow moving; e.g. a depleted and closed aff area of the mine.
Vertical block mining method being practiced at case study mine. In sublevel stoping methods the ore body is divided into rectangular blocks termed as stopes. The blocks are mined out while following a pyramid mining sequence in a transverse-retreat direction.
Fv = vertical stress in kilopascals kPa, and. Fh1 and monitoring the loss of borehole extensometer anchors during mining of large vertical crater retreat stopes between vertical crater retreat method at 2141 m suffered some caving, but
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