Sublevel stoping mining method

Top slicing mining under a mat that, together with. Shrinkage stope mining, mining methods, mining techniques. The solitary principal basis of tantalum mineral concentrates is the manufacture by sons of gwalia ltd. The miners go from the haulage level up the raise into the sublevels. Harraz presentation sublevel stoping 3 conditions for application of the deposit. Development sequence the diamond hill ore bodies and mine workings are in exceptionally solid unfractured rock and accordingly are amenable to low cost sublevel open stoping methods.

Dec 04, 2019 sublevel stoping sls is often regarded as a mining method for steeply dipping deposits in competent rock. Sublevel stoping is an underground mining method that involves the excavation of large blocks of ore in an unsupported fashion this method is suited to steeply. Edumine design and application of sublevel stoping methods. The second section describes underground mining equipment, with particular focus on excavation machinery such as boomheaders, coal cutters, continuous miners and shearers. Sublevel stoping article about sublevel stoping by the. In this method drifts are driven in the ore separated by a slice of ore two or three normal slices high. Sublevel stopingunderground mining methods slideshare. The first comprehensive work on one of the most important underground mining methods worldwide, geotechnical design for sublevel open stoping presents topics according to the conventional sublevel stoping process used by most mining houses, in which a sublevel stoping geometry is chosen for a particular mining method, equipment availability, and work force experience. In sublevel caving and topslicing, raises are put up at intervals of about 20 to 50 feet or more to the top of the ore body to serve as ore. A classification of stoping methods based upon method of support was adopted by the mining division of the bureau of mines in 1928. In sublevel stoping a form of open stoping, ore chutes, manway, and starting raises must be put up and one or more drifts driven on each sublevel fig. The invention relates to the technical field of stoping methods and particularly relates to an underhand sublevel open stoping method. It is one of the methods that can be applied to ore. The method requires that the hanging wall and often the footwall be of competent rock as the stulls provide the only artificial support.

A drift is driven along the bottom of the ore body, and this is eventually enlarged into the shape of a trough. This classification has been used ever since as a basis for describing methods in its publications dealing with mining methods and costs and is as follows. For sublevel stoping the ore body and walls should be strong enough to support open stoping. The figure is an illustration of the method, and shows half of the vein cut away where the stoping is being done. The company is currently carrying out pilot testing of mining methods for narrow veins, using the sublevel stoping and conventional mining cut and fill methods, in order to determine the optimal mining method for these types of structures. Sublevel stoping article about sublevel stoping by the free. Like sublevel stoping, excavated materials is dumped through an ore passchute to a central haulage drift backfilling is a separate unit operation performed once all material has been mined from stope or sub level. A stoping method in which relatively thin blocks of ore are caused to cave by successively undermining small panels. Sublevel stoping mining methods are generally employed to extract steeply dipping tabular ore deposits characterized by relatively long strikes and having various thicknesses. Rating is available when the video has been rented. Ore is produced by drilling and blasting longholes, which can range from 50 mm 2 in. Jul 21, 2016 shrinkage stoping is the method characterized by the mining advance being upward, with horizontal slices of ore being blasted along the length of the stope. This method is similar to cut and fill mining with the exception that after being blasted, broken ore is left in the stope where it is used to support the surrounding rock and as a platform from which to work. Kvhpm department of mining and mine surveying, royal institute of technology, stockholm, sweden received 1 november 1965 atraetthe following article contains a summary of the results obtained by theoretical calculations, model experiments and largescale.

Sublevel stoping differs from shrinkage stoping by providing sublevels from which vertical slices are blasted. It was developed over the years from a method originally known as short hole bench and train mining. Jul 25, 2016 transverse longhole stoping method fuente. Where ground conditions permit, it is possible to use a combination of cutandfill mining and sublevel stoping called rill mining. Sublevel stoping sls is often regarded as a mining method for steeply dipping deposits in competent rock. Shrinkage stoping is a mining method used for steeply dipping, narrower ore bodies with self supporting walls and ore. Economic comparison of drilling systems in sublevel stoping method. Stoping, in mining engineering, the opening of large underground rooms, or stopes, by the excavation of ore. Drilling the full length of the stope with wassara 3.

Bigholeopen stopinguses longer blast holes with larger diameter of 140165 mm. At the end of the trough, a raise is driven to the drilling. The underhand sublevel open stoping method comprises the following steps. Ore is transported to the montana tunnels mill facility by truck. Stull stoping is a form of stoping used in hardrock mining that uses systematic or random timbering stulls placed between the foot and hanging wall of the vein. The ore body should be fairly regular in shape and welldefined. Stoping is practiced in underground mineral mining when the surrounding rock is strong enough to permit the drilling, blasting, and removal of ore without caving. It is a versatile and productive method that is primarily used for large ore. Shrinkage stoping may be termed a classic mining method, having been perhaps the most popular mining method for mos t of the past century. In this manner, the stope is mined horizontally from one end to the other. Overview avoca method of mining is a variation of sublevel stoping method with the introduction of waste rockfill as backfill. A long hole stoping system for mining narrow platinum reefs advantages of this mining method it allows for a low safety and health risk as well as improved working environment. The uppermost sublevel underneath the cover is partly caved. In mines where the rock requires no artificial support, the operation is known as open stoping.

It sometimes is referred to as longhole or blasthole stoping. Economic comparison of drilling systems in sublevel stoping. Economic comparison of drilling systems in sublevel. In this method, the ore is excavated in open stopes, retreating from one end of the stope toward the other. The method involves extracting the ore between the sublevels. The sublevel stoping mining method is commonly used in largescale mining. The first full work on one of many crucial underground mining methods worldwide, geotechnical design for sublevel open stoping presents topics in response to the normal sublevel stoping course of utilized by most mining houses, throughout which a sublevel stoping geometry is chosen for a selected mining method, gear availability, and work strain experience. Backfill practices for sublevel stoping system springerlink. The operation includes long hole drilling and blasting from the drives. Cn105822307a underhand sublevel open stoping method. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Sublevel stoping mining methods are generally employed to extract steeply dipping tabular ore deposits characterized by relatively long. Sublevel stoping is one of the most useful underground mining methods in steeply. Generally a large scale open stoping method, it is often referred to as long hole or blast hole stoping.

Introduction the sublevel stoping mining method is usually applied to a relatively steeply dipping, competent ore body, surrounded by competent wall rock. As in sublevel stoping, vertical slices are removed by longhole drilling and blasting, but, as the slices are. This method is popular in high grade epithermal vein deposits where the strength and conditions of the walls of the open stopes are weak to moderate and require backfilling of waste rock to stabilise the walls, minimise the ore dilution and maximise the ore recovery. The sublevels are worked simultaneously, the lowest on a given block being farthest advanced and the subs above following one another at short intervals. A long hole stoping system for mining narrow platinum reefs. Sublevel stoping, vertical retreat stoping, sublevel caving, and cutandfill mining are methods that usually can be applied under similar conditions. This book presents the latest mining principles and techniques in use today. Sublevel stoping generally is a largescale open stoping method.

Usually only one or two sublevels are developed at a time, beginning at the top of the ore body. It is a versatile and productive method that is primarily used for. Its characteristic feature is the use of sublevels. Sublevel open stoping originated in the early 1900s in iron ore mines in michigan, usa. Variations of this method include vein alimak mining, transverse stoping, avoca and longitudinal mining. As in sublevel stoping, vertical slices are removed by longhole drilling and blasting, but, as the slices are extracted, filling is carried out.

A mining method involving overhand, underhand, and shrinkage stoping. Aug 19, 2019 this method is really a combination of several different methods of stoping. There are different variations of the method depending on the shape of the orebody. Black diamond drilling services australia database. Sublevel stoping method in brief sublevel stoping is one of the most useful underground mining methods in steeply dipping hardrock ore bodies. Typically production drilling is carried out by highefficiency column and arm longhole drills or dth drill rigs. Sublevel stoping version 2 australia mining consultants. Physical work is reduced and it is easier to motivate the workforce. Reflecting the international and diverse nature of the industry, a series of mining case studies is presented covering the commodity range from iron ore to diamonds extracted by operations located in all corners of the world. It is a versatile and productive method that is primarily used for large orebodies with a steep dip, regular shape and defined ore boundaries.

Sublevel open stoping is a highly mechanized mining method utilizing a wide range of equipment for drilling and mucking. What is the difference between sublevel stopping and. Geotechnical design for sublevel open stoping pdf ebook php. It is an overhand mining method that relies on broken ore being left in the stope to be used as the working floor and to support the walls. The objective here is to present a design methodology applicable to sublevel open stoping, but also to then bridge the gap between theory and practice by applying said methodology to an actual design example.

Sublevel stoping mining methods are very popular in canadian metal mines since they enable maximum ore recovery due to pillarless mining. Underground mining methods study guide by fransterz includes 16 questions covering vocabulary, terms and more. The most commonly used sublevel stoping mining methods are sublevel open stoping, longhole open stoping or blasthole stoping, and vertical crater retreat vcr. Sublevel stoping, sublevel caving, topslicing, and blockcaving require more stope preparation before ore extraction can begin. Most popular underground mining method in us for noncoal operations can be adapted to dipping seams pitch mining or very thick seams bench mining. During the mining cycle, only 30 35% of the ore blasted is extracted being. A portion of the broken ore is allowed to accumulate in the stope to provide a working platform for the miners and is thereafter withdrawn from the stope through chutes shrinkage stoping is. Shrinkage stoping is a shorthole mining method which is suitable for steeply dipping orebodies.

Sublevel stoping accounts for more than 60% of all underground production in. It is the first comprehensive work on one of the most important underground mining methods worldwide, presenting topics according to the conventional sublevel stoping process used by most mining houses, in which a sublevel stoping geometry is chosen for a particular mining method, equipment availability, and work force experience. This method usually is applied to strong ore bodies that require minimal support and are surrounded by strong country rock. Geotechnical design for sublevel open stoping international. Stull stoping is a supported mining method using timber or rock bolts in tabular, pitching ore bodies. Herein mining method existence of a high plunge length in the ore body is essential. Download geotechnical design for sublevel open stoping pdf ebook. The ore deposit is developed by a series of sublevel spaced at vertical intervals of 1825 ft or 30 ft and occasionally more.

Sublevel caving article about sublevel caving by the free. Oct 22, 2014 sublevel stoping underground mining methods 1. Other articles where sublevel stoping is discussed. This volume from crc press is published next month. In sublevel stoping, shorter blastholes are drilled from sublevels located at shorter. Sublevel stoping is a commonly used method in large scale mining. Traditional mining methods for hangingwall orebody include surface mining and backfill stoping method such as that in the fenghuangshan iron mine of china and the kidd creek zinccopper mine of canada, the sublevel caving method such as that in the yeshan iron mine and the longshou mine of china, and the sublevel open stoping and caving mining method such as that used by liu et al. In this way the amount of open ground is kept small. This method is really a combination of several different methods of stoping. Underground mining methods engineering fundamentals and. Underground mining methods presents the latest principles and techniques in use today. What is the difference between sublevel stopping and sublevel.

449 58 1553 776 30 974 799 448 1282 288 271 968 506 312 1332 1149 287 1186 262 905 343 1437 208 1327 936 1414 827 882 879 1380 223 354 1249 351 30 1196 42 25 766 103