Aug 29, 2010· The advance of the concrete lining of a shaft sunk in a hard rock mine is normally kept 2-3 diameters above the advancing shaft bottom to permit relaxation of the wall rock; however, when a hard rock mineshaft encounters bad ground, the lining …
Conventional mine shaft sinking methods involve the performance of a cycle of different operations—drilling and blasting, removal of smoke and cleaning of fly-rock lodged on overhead timbers, mucking and hoisting of the broken rock, and timbering. The latter (a) may be the last operation of the cycle, (b) may be carried on during drilling and mucking, provided it is done from a substantial ...
A METHODOLOGY FOR LINING DESIGN OF CIRCULAR MINE SHAFTS IN DIFFERENT ROCK MASSES Güler, Erdoan M.Sc., Department of Mining Engineering Supervisor: Asst. Prof. Dr. Hasan Öztürk January 2013, 72 pages The objective of this thesis is to predict lining thickness inside circular mine shafts. A numerical study
Design of the shaft lining and shaft stations for deep polymetallic ore deposits… 131 r w na RQD J J Q J JSRF = (5) where Jn is the joint set number, Jr indicates the joint roughness number, Ja is the joint alteration number, Jw is the joint water reduction factor, whereas SRF is the stress re- duction factor.
GB2130622A GB08327863A GB8327863A GB2130622A GB 2130622 A GB2130622 A GB 2130622A GB 08327863 A GB08327863 A GB 08327863A GB 8327863 A GB8327863 A GB 8327863A GB 2130622 A GB2130622 A GB 2130622A Authority GB United Kingdom Prior art keywords hole segment segments lining lowered Prior art date 1980-07-03 Legal status (The legal status is an assumption …
Shafts sunk in loose water-bearing soils, where there is great external pressure on the shaft sides, are nearly always circular; rectangular shafts with wood lining are often used in mining work, as the shafts are frequently of a temporary nature. Shaft sinking through rock is generally accomplished by blasting.
The Homestake Mine is located in the northern Black Hills of ft) wide pillar within the original 60-m (200-ft) wide shaft pillar. South Dakota. Figure 1 shows the general layout of the mine, A mechanized cut-and-fill method would be used to mine stopes
Shaft construction. A shaft is defined as a vertical or inclined permanent opening that gives access and services various levels of a mine. Shafts are designed according to their required purpose and depending on the demands set out. Types. Shafts can be either vertical or inclined.
DESIGN AND CONSTRUCTION OF HYDROSTATIC MINE SHAFT LINERS USING CAST IRON TUBBING TECHNOLOGY Konopka Subterranean Mine Shaft …
Failure of the shaft lining: The most frequent failures of the shaft lining result from a decrease of its strength or from an increase of the pressure of surrounding rock. When the strength of the lining is exceeded, the lining (bricks, stone blocks, concrete, cast iron and steel) deforms and eventually breaks.
A Snapshot of China's Coal Progress Three papers presented at the Shaft Design and Construction conference looked at how shaft-sinking technology has developed in China in recent years, and at the construction of a 30 million mt/y mine—a paper included, the chairman said, not for its specific focus on shafts per se, but as an indication of the level of investment currently being poured ...
May 26, 2016· PURPOSE OF SHAFT SINKING shaft sinking is used for many purposes. To transport men and materials to and from underground Workings. For hoisting ore and waste from underground. To serve as intake and return airways for the mine (ventilation shaft). To access an ore body These shafts are used in applications such as hydro electric projects, water ...
The fee simple and inheritance of the estate commonly known by the name of Coal Pits, situated within the township of Lower Darwen and adjoining the Township of Blackburn now in the possession of Henry Barton and others (as tenants at will) consisting of an ancient and respectable stone Mansion or dwelling house, 4 cottages, a barn and stables, Shippon, and other out buildings and about 30 ...
This mine is an open pit mine producing 5,000 tonnes ore and 5,000 tonnes waste per day. Rock characteristics for both ore and waste are typical of those of granite or porphyritic material. Operating conditions, wage scales, and unit prices are typical for western U.S. mining operations. All costs listed are in …
Since then, DTS Group completed lining projects for mine shafts, metro tunnels, ventilation shafts and civil tunnels in Ukraine, Russia, Kazakhstan, Poland, Canada and the UK. Those projects included cast iron, cast steel, fabricated rings of different geometry with diameters ranging from 4.00 to 9.00 meters.
Where the vein is much wider or flatter, as at the Bunker Hill and Sullivan mine, crosscuts are driven from the shaft or incline to and through the ore, but more than one drift may be required to facilitate. rapid removal of broken ore from the stopes. (Fig. 56, B and C.) Here the dip is 40° to 50° and the footwall drift (fig. 56, C) is used ...
Shotcrete lining of South Deep shafts of development. The proximity of the South Shaft complex to the South Deep shafts allowed for the orebody, between 90 and 95 levels, to be pre-developed. This fact allowed for the shaft reef intersection area of the South Deep shaft complex to be pre-extracted and backfilled, thereby eliminating the
Mine-Shaft Support System Specialty solutions for today's underground mining environment. State-of-the-Art shaft lining stops falling rock, shotcrete, and other hazards.
Conventional Shaft Sinking is a Drill-and-Blast excavation method that requires no restrictions on shaft depth or diameter. Frontier-Kemper has sunk more than 100 Production, Ventilation, and Service Shafts for mining projects in all types of geological conditions.
Design of lining for a mine shaft and decline using numerical modelling techniques Article (PDF Available) · January 2015 with 770 Reads How we measure 'reads'
Savona Equipment is one of the leading supplier of jig separators worldwide. Mineral processing jigs are also known as mineral jigs and if used specifically for gold recovery they are simply called gold mining jigs. Our inventory includes jig concentrators with a duplex mineral jig design and centrifugal jig …
This paper tries to find out the relationship between mechanisms of shaft lining rupture and the un- derground mining process. The analysis is based on the existence typical engineering and geological conditions in east- ern China; the impact of underground mining on the shaft lining and aquifer layer is analyzed by using numerical method.
@article{osti_6151158, title = {Method of lining a vertical mine shaft with concrete}, author = {Eklund, J D and Halter, J M and Moffat, R B and Rasmussen, D E and Sullivan, R G}, abstractNote = {The apparatus includes a cylindrical retainer form spaced inwardly of the wall of the shaft by the desired thickness of the liner to be poured and having overlapping edges which seal against concrete ...
Shaft mining or shaft sinking is excavating a vertical or near-vertical tunnel from the top down, where there is initially no access to the bottom.. Shallow shafts, typically sunk for civil engineering projects differ greatly in execution method from deep shafts, typically sunk for mining projects.When the top of the excavation is the ground surface, it is referred to as a shaft; when the top ...
The shaft lining in deep topsoil will be lead to fracture by the vertical additional force, which is caused by the bottom aquifer drainage settlement. Through the establishment of the shaft lining automatic monitoring system, the mechanical state of shaft can be effectively analyzed and the overall safety can be valuated. When monitoring data show that the shaft lining will be fractured, the ...
Many shaft collapses are related to the deterioration and failure of the masonry shaft lining materials. In modern mine shaft, concrete is widely used to provide support. To analyse shafts stability, the properties of the lining need to be well defined. The behaviour of masonry and concrete can be considerably affected by long-term exposure to harsh mine water.
@article{osti_863898, title = {Method of lining a vertical mine shaft with concrete}, author = {Eklund, James D and Halter, Joseph M and Rasmussen, Donald E and Sullivan, Robert G and Moffat, Robert B}, abstractNote = {The apparatus includes a cylindrical retainer form spaced inwardly of the wall of the shaft by the desired thickness of the liner to be poured and having overlapping edges which ...
DESIGN AND CONSTRUCTION OF HYDROSTATIC MINE SHAFT LINERS USING CAST IRON TUBBING TECHNOLOGY Konopka Subterranean Mine Shaft …