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Drop Raising in Mining (VCR) Method - copper mining

2021-6-24  Drop Raising in Mining (VCR) Method Drop Raising in Mining (VCR) Methods of Stopes (Extraction of Ore). Hindustan Copper Limited has addressed the complex ‘raising’ operation in mining and...

drop raising in mining vcr method - salonikkrawiecki.pl

drop raising in mining vcr method. Aug 01, 2015018332The raise is a type of excavation that can be constructed by the raise boring method. Raise boring is very important in the mining industry, and it is also applied to other underground engineering, such as water conduits, air shafts, elevator hoistways and cable shafts in hydropower stations and pumpedstorage power stations, ventilation ...

Drop Raising in Mining - read more - copper mining India ...

2021-7-15  Drop Raising in Mining - read more VCR concept: The term crater in blasting terminology is applied for creation of a surface cavity in a rock mass as result of detonating an explosive charge into...

Techniques of inverse drop raise blasting and slot drilling

The same drill drift can be used for the drilling of both down holes and up holes. In the case of down holes, the initial opening of the stope (drop raise) is not as much a problem as for the...

Drop raising in underground mines - SlideShare

2018-6-16  Drop raising in underground mines This is a method of making Raise between two adjacent levels by blasting. The concept of blasting is 'Vertical Crater Retreat'. This is a method of making Raise between two adjacent levels by blasting.

Study on the long-hole raising technique using one blast ...

2021-1-14  method. VCR method has been an established mining method being practiced in various mines all over the world [8]. An offshoot of this mining method is the VCR drop-raising technique that employs the same spherical crater charge technology as VCR method [9-10]. This technique has vastly

(PDF) Study on the raising technique using one blast based ...

In the raising process, long-hole presplitting is first performed at the periphery of the blasting pattern, and then inner VCR multiple-deck shots with the same slice height

Study on the long-hole raising technique using one blast ...

2018-9-1  A scheme of multiple deck blasting based on vertical crater retreat (VCR) drop-raising method was designed for an abandoned cavity with 30-m cover. The lower 12-m cover was first blasted to investigate the practical blast performance. Charging and timing patterns were adjusted accordingly and the left 18-m cover was successfully opened up.

Optimising Raising Development Using the Drop Raise

Optimising Raising Development Using the Drop Raise Method at DOZ Mine PT Freeport Indonesia. The DOZ underground mine at PT Freeport Indonesia is a copper and gold mine in Indonesia with current ore production of 42 000 tpd. Because of the mine expansion into the West DOZ more ventilation raises are needed to create a safe and healthy work place.

Drop Raising In Underground Mines: Methods For

Drop Raising in Underground Mines: Methods for Underground Mining Original Article. Ramlakhan Meena*, in ... Each mine is remarkable with work environment, establishments and underground functions directed by the sorts of minerals being looked for and the area and geographical arrangements, just as by such monetary contemplations as the ...

drop raising in mining vcr method - lagunakrynicamorska.pl

Drop Raising in Mining (VCR) Method copper mining India D rop Raising in Mining (VCR) Methods of Stopes ( Extraction of Ore). Hindustan Copper Limited has addressed the complex raising operation in mining and developed and implemented Drop Raising techniques at 80 meters intervals which improved safety and led to faster and higher productivity.

Drop Raising Method PDF Mining Drilling

2018-8-19  This is a method of making a raise connection between two. adjacent levels,nearly 60 m apart,by drilling large dia. holes (150-165mm),from upper level to lower level and. blasting them in stages. The raise is usually vertical but may also be steeply inclined.

Optimising Raising Development Using the Drop Raise

Optimising Raising Development Using the Drop Raise Method at DOZ Mine PT Freeport Indonesia. The DOZ underground mine at PT Freeport Indonesia is a copper and gold mine in Indonesia with current ore production of 42 000 tpd. Because of the mine expansion into the West DOZ more ventilation raises are needed to create a safe and healthy work place.

Drop raising in underground mines - SlideShare

DROP RAISING - INTRODUCTION Special method of charging of Explosives and blasting is done in stages from bottom level for excavation in slices. The charging and blasting of the holes is based on Vertical Crater Retreat (VCR) method. The raise is

Drop Raising In Underground Mines: Methods For

Drop Raising in Underground Mines: Methods for Underground Mining Original Article. Ramlakhan Meena*, in ... Each mine is remarkable with work environment, establishments and underground functions directed by the sorts of minerals being looked for and the area and geographical arrangements, just as by such monetary contemplations as the ...

MECHANISED MINE DEVELOPMENT UTILISING ROCK

2009-8-26  Drop raising is commonly used world-wide in the development of rock and ventilation passes over a length of generally up to 60m in the vertical mode and around 15m in an almost flat mode (Refer graph 1 and 2 – Inclination and length matrix). Drop raising offers a safe method of excavation at relatively economic cost.

Underground shaft excavation using the inverse (drop ...

2021-8-29  Inverse raise excavation is characterized by driving an upward face while allowing for the extraction of the blasted rock material in the lower sill or base of the raise. Accessibility to both the upper and lower levels of the raise is an essential component for the applicability of this method. Explosive loading is undertaken from the upper drift.

Rockpasses: a guide to excavation methodology

2009-8-26  method unacceptable. ˜ Raise climber: site preparation and installation time makes this method inappropriate for shorter holes. ˜ Conventional drop raising: this method is applicable, but the extra cost and the interruption of the raise process counts against it. ˜ Invert drop raising is totally applicable due to set-up

Description of mining methods (step by step)

Primary Mining Method Cut-and-Fill mining method. Information. Development in the ore of the upper and lower drift. The distance between the levels is 91 m (300 ft). Development of the service raise. Excavation of the stope. Two options: the first option consists in starting the stope from the level.

Underground Mining Methods - UFRGS

2009-12-7  characteristics of the major mining methods. 1.3.2 Room-and-Pillar Mining Room-and-pillar mining is designed for flat-bedded deposits of limited thickness, such as copper shale, coal, salt and potash, limestone, and dolomite. This method is used to recover resources in open stopes. The method leaves pillars to support the

Optimising Raising Development Using the Drop Raise

Optimising Raising Development Using the Drop Raise Method at DOZ Mine PT Freeport Indonesia. The DOZ underground mine at PT Freeport Indonesia is a copper and gold mine in Indonesia with current ore production of 42 000 tpd. Because of the mine expansion into the West DOZ more ventilation raises are needed to create a safe and healthy work place.

Drop Raising In Underground Mines: Methods For

Drop Raising in Underground Mines: Methods for Underground Mining Original Article. Ramlakhan Meena*, in ... Each mine is remarkable with work environment, establishments and underground functions directed by the sorts of minerals being looked for and the area and geographical arrangements, just as by such monetary contemplations as the ...

Drop raising in underground mines - SlideShare

DROP RAISING - INTRODUCTION Special method of charging of Explosives and blasting is done in stages from bottom level for excavation in slices. The charging and blasting of the holes is based on Vertical Crater Retreat (VCR) method. The raise is

Underground shaft excavation using the inverse (drop ...

2021-8-29  Inverse raise excavation is characterized by driving an upward face while allowing for the extraction of the blasted rock material in the lower sill or base of the raise. Accessibility to both the upper and lower levels of the raise is an essential component for the applicability of this method. Explosive loading is undertaken from the upper drift.

Drop Raising Method Mining Drilling

2018-8-19  Drop Raising Method - Free download as PDF File (.pdf), Text File (.txt) or view presentation slides online. Drop raising method

Rockpasses: a guide to excavation methodology

2009-8-26  method unacceptable. ˜ Raise climber: site preparation and installation time makes this method inappropriate for shorter holes. ˜ Conventional drop raising: this method is applicable, but the extra cost and the interruption of the raise process counts against it. ˜ Invert drop raising is totally applicable due to set-up

Description of mining methods (step by step)

Primary Mining Method Cut-and-Fill mining method. Information. Development in the ore of the upper and lower drift. The distance between the levels is 91 m (300 ft). Development of the service raise. Excavation of the stope. Two options: the first option consists in starting the stope from the level.

Underground Mining Methods - UFRGS

2009-12-7  characteristics of the major mining methods. 1.3.2 Room-and-Pillar Mining Room-and-pillar mining is designed for flat-bedded deposits of limited thickness, such as copper shale, coal, salt and potash, limestone, and dolomite. This method is used to recover resources in open stopes. The method leaves pillars to support the

RAISE BORED SLOT RAISES: A MODERN MINING

2018-3-7  Nowadays, there are several methods traditionally employed in mines to produce these slot raises: long-hole rigs, manual drilling methods, and even conventional raise boring to name but a few. But, regardless of the method, all of them share a common complaint: The complexity of the mining process involving multiple step operations,

Ventilation - QueensMineDesignWiki

2019-6-28  Transverse stoping is similar to the VCR mining method in which it is necessary to provide ventilation for the top sill of the stope and the bottom sill of the stope where muck is picked up. Both of these sills are driven by crosscutting from main level drifts. In the top sill, air is directed through an auxiliary fan to the face through vent ...