The pattern of shotholes drilled for solid blasting in coal in galleries of bord and pillar working is 1 Wedge cut or 2 Fan cut Drivage of a narrow gallery in coal without an undercut can be compared with drivage of a drift in stone Blasting out coal in the centre of the face in the wedge cut pattern gives free face for the remaining coal...We are a professional mining machinery manufacturer, the main equipment including: jaw crusher, cone crusher and other sandstone equipment;Ball mill, flotation machine, concentrator and other beneficiation equipment; Powder Grinding Plant, rotary dryer, briquette machine, mining, metallurgy and other related equipment. which can crush all kinds of metal and non-metallic ore, also can be dry grinding and wet grinding.If you are interested in our products or want to visit the nearby production site, you can click the button below to consult us.Welcome to our factory to test machine for free!Get Price
Production Capacity: 50-800TPH
Application Field: Hydropower, building material, highway, city construction, metallurgy, coal mining and so on.etc.
Applied Materials: Granite, basalt, bank gravel, bauxite, cement clinker, quartz silicon carbide,limestone, river stone, etc.
Feeding Size: 65-300mm
Discharging Size: 3-60mm
Production Capacity: 12-1000TPH
Capacity: 0.18-7 (m ³/min)
Suitable Materials: Lithium, copper, zinc, lead, nickel, gold and other non-ferrous metals, ferrous and non-metal.
Major Equipment: Jaw crusher, ball mill, sprial classifier, flotation machine, concentrator machine and dryer machine
Feeding Size: 0-5mm
Output Size: 30-60mm or Custom-made
Input Size: ≦10mm
Configuration: Jaw crusher, grinding mill, bucket elevator, magnetic vibrating feeder, transmission gear, main engine.
Applied Materials: Feldspar, calcite, talc, barite, fluorite, rare earth, marble, ceramics, bauxite, manganese, phosphate rock, etc.
Application Area: Building materials, chemicals, fertilizer, metallurgy, mining, refractory, ceramic, steel, thermal power, coal, etc.
Product Warranty: One Year
Feeding Granularity: 300-1050mm
Production Capacity: 80-1000TPH
Feeding Granularity: 120-1500mm
Production Capacity: 1-2200t/h
Feed Opening: 150×250-1600×2100mm
The pattern of shotholes drilled for solid blasting in coal in galleries of bord and pillar working is 1 Wedge cut or 2 Fan cut Drivage of a narrow gallery in coal without an undercut can be compared with drivage of a drift in stone Blasting out coal in the centre of the face in the wedge cut pattern gives free face for the remaining coalGet Price
Abstract Controlled drilling and blasting continue to be an important method of block production and for block splitting Drill and blast technique has disadvantage that sometimes it producesGet Price
Controlled blasting techniques include Presplitting in which the purpose is to form a fracture plane beyond which the radial cracks from the blast cannot travel Trim or Cushion blasting Smooth Perimeter or Contour blasting in underground mines and muffle blasting which addresses the need to prevent flyrock from injuring individuals or damaging surrounding structuresGet Price
Aug 20 2018 · Course Outcomes Drilling and blasting is primary operation in any mining organization student understands various methods of drilling design and selection of drilling methods Knowledge about explosives and blasting techniques makes student confident in design of blastingGet Price
Most blasting in mines involves charging explosives into holes drilled in rock The entrance or mouth of a drill hole is called the collar and the end is the toe Drilling is still carried out in some cases in the ASM sector by hand using a hammer and chisel This is obviously tedious and slow especially in hardrock mining conditionsGet Price
what is dimensional stone blasting blasting technique in dimensional stone mining Masters Theses Scholars Mine Many blasting applications in the mining industry demand that the hard rock being blasted remains structurally competent For example presplitting is a common technique to reduce fracturing and operators of dimension stone quarries use this blasting method to eliminateGet Price
Jul 03 2019 · The most common technique for rock blasting is to drill holes at precise points in the rock face Explosives with detonators are placed in the drilled holes The charges are then detonated After the explosion the broken material is cleared awayGet Price
Innovative blasting techniques and technologies The aim of the modules according to Dr Sharpe is to make relevant topics concerning rock blasting accessible to all They focus on the needtoknows of rock blasting by being quantitative but removing all the mathematical elements from this type ofGet Price
BlastingMathematical models I US Bureau of Mines II Title Series TN23U71 no 8550 62106173 US Dept of the Int Library For sale by the Superintendent of Documents US Government Printing Office and filled joints influence blasting and mining in limeGet Price