BLAST DESIGN IN SURFACE MINES. Objectives of Blast Design. Obtaining optimum fragment size Proper degree of fragmentation to achieve the lowest combined cost of mining Utilising explosives energy properly through suitable blast design in the mines Controlling the unwanted effects of blasting Minimising the environmental impacts
3 天前· Stemming has been shown to increase blast efficiency and fragmentation, as well as reduce or prevent blast damage around the firing location and reduce the amount of explosives. Traditionally, overhead blast holes in underground mines are not stemmed due .
Returning Mined Land to Productivity Through Reclamation . Returning Mined Land to Productivity Through Reclamation . 30th Dec 2015 . ... Both underground and opencast mines require reclamation, but the approaches are different. ... Restore the quality of soils to their premining level; Maintain or improve landscape visual and functional ...
Opencast mining for coal as we know it today started in 1942 as a wartime expedient. To boost vitally needed coal output, surface mining became the responsibility of the Mines Department of the Board of Trade and was carried on by the Ministry of Works until 1945, then by the Ministry of Fuel and Power.
Oct 26, 2015· In case of Mechanised Mine – working area of 3 power shovels. In case of Semi – Mechanised – area of maximum of 4 Mate districts with 2 KM flat area as radius. In case of Mechanised Mine – working area of max. 2 power shovels. In case of .
A newly developed mining method allows ore and overburden in hard rock mines to be transported more efficiently and with significantly lower environmental impact. It involves an integrated conveying and processing system to avoid heavy truck transportation in inverted coneshaped opencast mines.
Apr 22, 2017· (a) Study of explosive used in the mines magazine, keeping Reserve station, Blasting efficiency, precautions against pilferage wastage. (b) Asst. .
Jan 30, 2015· Drone2GIS offers a safe, efficient and accurate alternative approach to the conventional surveying method employed in open cast mines, quarries .
Mar 15, 2018· Meanwhile, mining operators can perform needed maintenance on other systems to bring them back online to their highest efficiency levels. Safety. Mining operations harbor many risks to equipment and workers. Hazardous gases can build up in mining tunnels without accurate ventilation. Rising temperatures can harm equipment, miners, and drivers.
Charge length (L): This is the explosive column in a blasthole and should be at least 20D in order to utilize fully the explosiongenerated strain in the rock. Stemming (T): This is the inert material filled between the explosive charge and the collar of the blasthole to confine the explosion gases.
There has been a rapid increase in the number of explosive manufacturers supplying bulk explosives, cartridge explosives and accessories as per the use in opencast and underground mines. A large number of manufacturers in the country and availability of various types of explosives .
This in turn helps to improve the fracturing, piling and fragmentation characteristics and thus the overall economy of the blasting operation. One of the most fundamental and important controllable parameters is the firing pattern in multirow blast rounds 2. Nominal drilling patterns with a burden 'B' and spacing 'S' can be subject to radical modification depending on the firing sequence, which brings into focus the .
SURFACE MINE BLASTING Proceedings: Bureau of Mines Technology Transfer Seminar, Chicago, IL, April 15, 1987 Compiled by Staff, Bureau of Mines ABSTRACT The Bureau of Mines has sponsored a comprehensive research program to enhance the safe, effective, and efficient use of blasting technology by the mining industry.
Provided that in case of a certificate which is not restricted to mines having opencast working only, the experience referred to in this subregulation shall include practical experience for a period of not less than one year of surveying the working of a below ground mine having an average monthly output of not less than 1000 tonnes or such ...
require mine owners to set down in writing operating rules on a number of issues, including both mine fires and frictional ignitions of flammable gas and to notify the HSE of them.
Ecological Impacts of Opencast Mining: 1. Removal of all vegetation (flora) and thereby fauna from the area required for mining and other purposes. 2. Pollution of water in the surrounding water bodies due to leaching from overburden dumps and due to the pollutants from the other activities.
Considering the current trends in blasting and increasing awareness, there is sufficient scope at most of the mines to improve the attitude of public towards blasting by creating awareness. Control of blast noise mitigates the general notion to blast and annoyance, provided the blast has been designed for optimum explosive energy usage.
