shallow hole blasting ore mining

Long hole drilling applied to narrow reef mining

LONG HOLE DRILLING APPLIED TO NARROW REEF MINING 199 Objective ... The ore bodies are all thin, with widths from 0.6 metres to 0.8 metres. Figure 1 shows the face layout. ... All blast holes are PICKERING, R.G.B. Long hole drilling applied to narrow reef mining.

Chapter 8 BLAST DESIGN - NPS

Shallow holes = 1 to 2 External loads = .3 Tons of Rock = Powder Factor ... The economic analysis of the use of explosives is an important part of blasting operations in mining and construction. ... total costs encountered in breaking, moving, and processing rock and ore. The small difference in the cost of a

Narrow vein minimum dilution case study – AMC Consultants

Blast design: Slot development. Consider large relief raise (i.e V30 – 760 mm) Reduce drillhole size. Implement recommended drill patterns, including perimeter blast control. Use guide rods (reduce deviation). Stope blasting: Low-density emulsion in NV stopes. Implement the stope (longhole and ore drive) blast designs provided by AMC.

Reduce ore dilution and loss in open pit mines | BMT

Centerra Gold's Mount Milligan open cast copper mine recovered over US$600,000 of ore in one blast. Anaconda Mining's Pine Cove gold mine reduced dilution from 20% to less than 5% and generated a 15% increase in recovered tonnes, valued at US$15-30k per blast.

Application of Shallow-Hole Blasting in Improving the ...

23-09-2019· energies Article Application of Shallow-Hole Blasting in Improving the Stability of Gob-Side Retaining Entry in Deep Mines: A Case Study Yong Chen 1, Shuqi Ma 1,2,*, Yugui Yang 3, Ningkang Meng 1 and Jianbiao Bai 1 1 State Key Laboratory of Coal Resource and Safe Mining, China University of Mining and Technology, Xuzhou 221008, China; [email protected] (Y.C.); …

Application of Shallow-Hole Blasting in Improving the ...

The hanging of hard roof strata in the gob-side retaining entry in deep mines could lead to dynamic disasters. The pressure relief mechanism for the hard roof strata using shallow-hole blasting was investigated by a combined method of theoretical analysis, numerical simulation, and field test in the Sanhejian coal mine. The shallow-hole blasting model was established using LS-DYNA3D …

BEST PRACTICES IN DRILL AND BLAST - IQPC Corporate

A mine can be set up in one of two ways; either the plant is set up to accept whatever fragmentation the blasting group produces, or the plant dictates to the mining teams the fragmentation distribution they will accept. To achieve what the plant wants, electronic detonators are required. Without them, this will remain unattainable,

Designing Blast Patterns Using Empirical Formulas

Designing Blast Patterns Using Empirical Formulas ... By Joseph M. Pugliese Twin Cities Mining Research Center, Minneapolis, Minn . . US Department of Interior Office of Surface Mining Reclamation and Enforcement Kenneth K. Eltschlager Mining/Explosives Engineer ... Calculation of hole length, H, from equation 3 ...

Real-time information about ore quality - Mining3

Through constant monitoring and improvement, each aspect of mining aims to control and reduce costs and improve the extraction of ore from the ground in the most efficient manner. Research The overarching objective of this work is to develop a drill-mounted system to measure and characterise material whilst blast-hole drilling, enabling more effective blasting, as well as allowing for ...

Types of Underground Mining Method Comparison

16-03-2017· Mining the ore by breast stoping requires more drilling and blasting. Broken ore on the slice must be shoveled into barrows or cars and, taken to the raises. Development must be kept ahead of the demand for ore. It is difficult to leave bodies of low-grade ore which may be found in the deposit.

(PDF) ROCK BLASTING FOR MINING - ResearchGate

A shallow-hole driller may also be used for p reparing blast holes in underground m ines. If we do not do these operations, the expendi ture of mining would be more and …

Fatal Accidents Due To Flyrock And Lack Of Blast Area ...

The ore was mined by drilling and blasting from shallow multiple benches. The mining company used a blasting contractor for loading and firing the shots. The blast round consisted of 49 holes, 3-in diameter, 12 ft deep, on a 6-ft spacing. Each hole

Drilling patterns - QueensMineDesignWiki

This type of blast design is typically used for expanding a previously excavated drift to accommodate more space or to correct a poor blast. Therefore, they are generally shallow blasts along a length of a wall. This blast pattern is a variant of the fan cut but all of the holes are angled along the length of the wall that is to be excavated.

Study on Mining Technology of Shallow Hole + Deep Hole ...

01-07-2019· In this paper, the mining method of shallow-hole and deep-hole shrinkage with ductule grouting in advance for roof reinforcement is studied, which is used to recover steeply inclined thick orebody with broken roof. The main innovations in mining technology are as follows: the orebody is artificially divided into two layers, the upper layer is mined by shallow hole blasting, the lower layer …

In-Situ Leaching & Borehole Mining

14-01-2019· In this case, one potentially feasible mining method is to enter the ore body and excavate swell space to receive the remaining rock mass which is blasted. Extraction proceeds on a hybrid scheme where the rich portions of the ore body are mined conventionally and the leaner portions are exploited with the in situ technique. Shallow Deposits

Non-explosive rock breaking: Mining all of the reef, all ...

21-01-2020· The mining industry's dependency on blasting as a means to fragment the rock, ... some of the country's narrow reef mines have ore bodies with thicknesses of less than 500 mm, ... s diamond wire cutting trials prompted the Mandela Mining Precinct to instead consider the use of this technology in shallow platinum mines, ...

Major Mines & Projects | Sishen Mine

Four types of hard iron ore, namely massive, laminated, conglomerated and brecciate iron ore are mined. Blast hole drilling is a continuous process and blasting is done once a day, typically in the early afternoons between 12h00 and 14h00, at each of the active mining areas within the mine pit.

(PDF) Underground mining Methods - ResearchGate

Caving mining is advant ageous in that it maximizes ore recovery (as little ore as possible is left behind) the method comes with significant problems : Surface subsiden ce in the case of shallow ...

Stoping - Wikipedia

Long hole stoping is a highly selective and productive method of mining and can cater for varying ore thicknesses and dips (0 - 90 degree). It differs from manual methods such as timbered and shrinkage as once the stope has begun blasting phase it cannot be accessed by personnel.

Sub-level open stoping - QueensMineDesignWiki

Sublevel Open Stoping originated in the early 1900's in iron ore mines in Michigan, USA. It was developed over the years from a method originally known as short hole bench and train mining.Generally a large scale open stoping method, it is often referred to as long hole or blast hole …

2012 Americas School of Mines

Open pit mines are used to exploit low grade, shallow ore bodies. However, some pits are quite deep – about 1 km. The mining rate is greater than 20,000 tonnes per day (tpd) but is usually much greater. Some pits operate at a rate of more than 100,000 tpd Open pit mining results in two waste streams: waste rock which contains no economic

These 10 mines have the world's most valuable ore - MINING…

29-01-2017· Another of Cameco's underground mines, McArthur River, is the world's largest and second highest-grade uranium operation. With one tonne of ore reserves worth USD$5,523, McArthur River mine ...

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