Opening Hour

Mon - Fri, 8:00 - 9:00

Call Us

+86-21-58386189

SGB for the Mining and Minerals Sector SKILLS PROGRAMME .

Skills Programme Description: Secondary Blasting Operations for Underground Hard Rock . 2. 3. Registration Number: 4. Total Credit Value: Minimum of 36 5. Band on the NQF FET 6. Field: Manufacturing Engineering and Technology Sub-Field: Fabrication and Extraction. 7. Issue Date: 8. Review Date: 9. Purpose of Skills Programme

Get Price

BEST PRACTICES IN DRILL AND BLAST

amounts of oversize rock which cannot pass through the crusher and will require size reduction before being taken to the crusher. Conducting fragment break-up is costly and needs secondary blasting or use of a mechanical hammer for rock disintegration. UNIQUE FACTORS THAT INFLUENCE FRAGMENTATION

Get Price

Taking precautions against flyrock | Business Queensland

avoiding overcharging when conducting secondary blasting. Previous excavations and the driller of the blast holes can provide important information about the rock's structure. The area surrounding a blast site must be inspected to determine the distances to residences, roads, public places and dangerous goods storages.

Get Price

Home - Blasting

Call Us Today: +264 61 212090 / +264 81 128 5661 | Email: [email protected]

Get Price

Secondary blasting | Article about secondary blasting by ...

In secondary blasting, explosive denotation release a huge amount of energy which results to rock shattering and scattering and consequently high fly rocks. Comparative analysis of hydraulic drop ball and secondary blasting technique for secondary breaking in aggregate quarries.

Get Price

pneumatic rock diesel drill for secondary blasting ...

Handheld Hydraulic Rock Drills . This lightweight tool is designed for drilling blast, anchor and rock . Rock Drill Sales offers a wide range of pneumatic rock . Secondary Blasting Standard Operating Procedure. Secondary Blasting Standard . undesirable rock that is propelled through air from a .

Get Price

Home - Blasting

Call Us Today: +264 61 212090 / +264 81 128 5661 | Email: [email protected]

Get Price

building on rocky land - Ask the Builder

Blasting can be quite expensive. Two lots above my own home have never been built on because several previous owners have spent tens of thousands of dollars blasting holes in solid granite only to exhaust their budget and go bankrupt. You're lucky that excavators can dig through your rock. Footings On Rock .

Get Price

Rock Boulder Blasting with Explosive

Table of ContentsBlockholingSnakeholing or BombingMudcappingBlasting Mats Boulders can be broken up using either explosives or mechanical methods which can be implemented in many ways. Handling boulders hung up in crushers is inherently inefficient for the overall operation, and the techniques in handling them each have their own advantages and disadvantages. Table 4 shows a comparison of ...

Get Price

Drilling and blasting - Wikipedia

Apr 15, 2017· After a production blast, a secondary blast may be required to reblast a portion of the rock to reduce it to a size fit for handling by the machines and .

Get Price

FAQ – Royex Rock Breaking & Excavation – Safe, Reliable ...

Rock vibrations are strongly dependent on charge weight, rock conditions and the proximity of the measuring equipment relative to the blast in question. Tests in granite shows that Royex may generate vibrations up to 68 mm/second at a distance of 1 meter from the vibration detector, for a load weight of 1 kilogram and 8 cubic meters blasted.

Get Price

Royex Rock Breaking & Excavation – Safe, Reliable and Low ...

Royex rock breaking tools together with the support of our expert engineers offers a powerful alternative to conventional explosives and mechanical rock breaking hammers. ... ideal for tunnel perimeter blasting, ... Minimal NOx and CO generation makes the product ideal for underground mining applications such as secondary blasting.

Get Price

Tunnels and underground excavations - Tunneling techniques ...

Tunnels and underground excavations - Tunnels and underground excavations - Tunneling techniques: Tunnels are generally grouped in four broad categories, depending on the material through which they pass: soft ground, consisting of soil and very weak rock; hard rock; soft rock, such as shale, chalk, and friable sandstone; and subaqueous. While these four broad types of .

Get Price

Blaster's Training Modules - Module 1 - Explosives

used as a detonator in the blasting industry, is shown to the right. HE's that can be detonated directly with a No. 8 cap are called cap-sensitive. BA's that cannot be detonated directly with a No. 8 cap are called cap-insensitive or non-cap-sensitive. 7 mm 40-45 mm black powder fuse 1.2-gram secondary explosive 0.3-gram primary explosive

Get Price

SAFETY: Newcrest tests secondary drilling and blasting ...

Jun 25, 2020· As part of the trial, Newcrest tested MacLean Engineering's new secondary break drill and blast system (Automated Explosive Charger) as well as Orica's Wireless Blasting System (WebGen 100) in an isolated area. Secondary break activities are used when oversized rocks need to be removed from the draw point.

Get Price

secondary blasting of rocks - bloggercucina

secondary blasting of rocks - studiebureauderkunsten. Definition of secondary blasting - mindat glossary. Two methods of secondary blasting of rock are available. The first, called the plaster or mudcap method, is to fire a charge of explosive placed on the rock and covered with clay, the shock of the detonating explosive breaking the block.

Get Price

Drill, blast or break - rock quarries have a choice ...

Environmental concerns are often behind a quarry operator's decision to look for alternative methods of primary and secondary rock breaking or drilling and blasting. Indeed, in quarrying operations the processes are often subjected to profitability analysis.

Get Price

PROCEDURES FOR BLASTING

blast. Modification of blasting procedures should include limiting the size and frequency of blasts to limit the production of noxious fumes, and stripping of the overburden prior to blasting and excavating the shot rock immediately after blasting to allow the venting of gases. The use of vent holes or vent pits may also be necessary.

Get Price

A study in cost analysis of aggregate production as ...

Oct 01, 2017· Blasting is one of the most important operations, and has substantial technical and economic effect on the mining projects. In such projects the prime aim of blasting operations is rock fragmentation that is necessary for subsequent processes (such as transportation, crushing, etc.) to achieve a higher efficiency (Monjezi et al., 2013).

Get Price

Surface Mine Blasting - Office of Surface Mining

rock fragmentation, blasting effects on Appalachian water wells, blast vibration measurement near structures, and the reduction of accidents through improved blasting safety. 2 BUREAU OF MINES SURFACE MINE BLASTING RESEARCH By Dennis V. D'Andrea1 ABSTRACT The Bureau of Mines Twin Cities Re­ ...

Get Price

H BLASTING IN SURFACE EXCAVATION

rock pile with a possible secondary fragmentation due to impacts between rocks projected from opposite directions. ... However, secondary blasting is the most expensive type of blasting. Appropriate blast design is important in order to lessen the production of over size.

Get Price

Engineering Geology Field Manual - Volume II - 2nd Ed ...

rocks similar to the typical rocks listed in table 19-1. Denser rocks such as basalt require smaller ratios (higher powder factors). Lighter materials such as some sandstone or bituminous coal can be blasted with higher ratios (lower powder factors). The hardness or brittleness of rock can have a significant effect on blasting results.

Get Price

pneumatic rock diesel drill for secondary blasting ...

Handheld Hydraulic Rock Drills . This lightweight tool is designed for drilling blast, anchor and rock . Rock Drill Sales offers a wide range of pneumatic rock . Secondary Blasting Standard Operating Procedure. Secondary Blasting Standard . undesirable rock that is propelled through air from a .

Get Price

Cost of Blasting - Earthwork/grading engineering - Eng-Tips

Oct 15, 2003· Rock blasting can cost anywhere from $3.00/m³ to $150/m³ depending on location in the world and location relative to buildings, etc. Small diamter drills (115mm and less) cost about $20,000 USD/month to operate. So figure $1000/day if you drill and $1500/day if someone else drills.

Get Price

Construction Blasting Risk Management | Expert Commentary ...

At blast time, the Blaster-in-Charge should fire or instruct the designated shot-firer to fire the blast. After the post-blast fumes have dissipated to safe levels, the Blaster-in-Charge should inspect the shot area. During the examination the blaster should look for: Dangerous rock .

Get Price

Enhancing blast outcomes | Aggregates Business

Having secured distribution rights for the Varistem – a patented blast stemming plug for mining, quarrying and civil blasting applications – South Africa-based ERG Industrial is currently doing local trials to prove the potential productivity increase and downstream savings stemming plugs can provide to African quarries and mines.

Get Price

H BLASTING IN SURFACE EXCAVATION

rock pile with a possible secondary fragmentation due to impacts between rocks projected from opposite directions. ... However, secondary blasting is the most expensive type of blasting. Appropriate blast design is important in order to lessen the production of over size.

Get Price

Geology and Construction

within the rock mass, as well as the size of the charge. As a rule, spacing will vary between 0.75 and 1.25 times the burden (i.e., the width of the strip blown from the face). Generally, 1 kg of high explosive will bring down about 8–12 tonnes of rock. Good fragmentation reduces or eliminates the amount of secondary blasting, while

Get Price

Blast Hole Drilling: The Basic Process | RPM Drilling

Technique #4 – Secondary blasting. Sometimes, no matter which method was initially employed, it may prove necessary to blast the same rock/location a second time in order to reduce the previously blasted portion of rock to a manageable size that can be easily handled by excavators, and/or crushers and other such machinery.

Get Price

Unbelievable footage shows massive explosions rock Lebanon ...

Aug 04, 2020· Other views of the fire and subsequent blast raised more questions as some witnesses said they believed a "missile" was the cause of the explosion. #BREAKING – Secondary .

Get Price
  • pictures machines pictures crusher
  • eagle jaw d540 rock crusher specifications
  • jaw crusher je 300
  • floor grinding aurora
  • fls ball mill inlet design
  • 5 process of gold cip plant in south africa
  • chepest rates for mixture grinder
  • cement coal talc gypsum kaolin limestone vertical mill
  • micro pulverizer manufacturer in mumbai
  • belt conveyor produsen pertambangan