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Blasting Designs In Narrow Gold Reef Mines Pdf I UNDERGROUND BLASTING Mining and Blasting Weblog Blasting operation is carried out against gravity, and the scatter Short-hole blasting is usually used in breast stoping for narrow, tubular orebodies such as gold or platinum reefs. mtmy 16 Figure 13 is an example of blasting arrangement in breast stoping in a gold mine in South Africa.
In the narrow stopes of South African gold mines, rockbreaking is carried out by drilling and blasting with safety fuse and igniter cord being used as the initiation system. The fuse/gniter cord system is used primarily because of its low cost, however several limitations of this method include: inaccurate delay time, unreliable firing, inflexible application to varied configurations, and the ...
Gold mines and the older platinum mines are similar insofar as they utilize relatively unskilled labour to mine narrow reefs, having a seam height of the order of 1 m at dips between 5 and 30 degrees. Tradition-ally, CFIC initiation has been used for blast initia-tion for reasons of low cost and ease of use. Narrow
(Mining Engineering) Synopsis Gold bearing deposits of the Witwatersrand basin are generally less than 2m thick and require conventional narrow-reef mining methods for extraction and employ explosives as a means of rock breaking. Optimal utilization of explosives is dependent on the overall design of the blast. The
21-01-2020· South Africa's reef deposits, especially gold and platinum-bearing ore bodies, are narrow and tabular. While legislation dictates a minimum operation height of 800 mm in areas where people work, some of the country's narrow reef mines have ore bodies with thicknesses of less than 500 mm, which results in ore dilution, as waste ore with zero economic value is also mined.
BLAST DESIGN (Figure 8-2) Staggered pattern (Figure 8-3) Sing (Figure 8-1) Square or rectangular pattern. 114 ... The economic analysis of the use of explosives is an important part of blasting operations in mining and construction. Explosives are energy, and the efficient use of this energy is a major factor in keeping rock blasting
Harper, G. Pneumatic versus hydraulic drilling and the impact on profitability; SAIMM School: Drilling and Blasting in Narrow Reefs and their Effect on Profitability of Gold Mines; 26-27 Oct 1993 .Hemp, D.A. Effect of backfill on seismicity and ... Author: South African Council for Scientific and Industrial Research.Division of Mining Technology. Publisher:
PDF | On Jan 1, 1997, Dominy S.C. and others published Narrow vein mining-A challenge to the operator. | Find, read and cite all the research you need on ResearchGate
process. However, most of the narrow reef mines where 'trackless mechanized mining' was introduced in the early 1980s have reverted to conventional mining. In the wider reefs mechanized mining is the option of choice; unfortunately most of the gold and platinum mines have very narrow reefs that are not suited to 'off the shelf' equipment.
Harper, G. Pneumatic versus hydraulic drilling and the impact on profitability; SAIMM School: Drilling and Blasting in Narrow Reefs and their Effect on Profitability of Gold Mines; 26-27 Oct 1993 .Hemp, D.A. Effect of backfill on Effect of backfill on
Preparation of EMPs for Mines : Facing the Realities - Colloquium ( 3 August 1993 ) 6. Drilling & Blasting in Narrow Reefs and their Effect on the Profitability of Gold Mines - School ( 22 & 23 March 1994 ) 7. Productivity for Present Profitability ...
blasting designs in narrow gold reef mines pdf. Modern mining Re. ... mining narrow-reef gold costs Selected blast mining will during blasting Selected blast mining narrow-reef precious metals mines... Mangana Gold Mine ENVIRONMENTAL EFFECTS.
layer or the reef, the bed of quartz pebbles exploited by gold mines in South Africa). It is a caving method particularly well adapted to relatively flat-lying, thin, plan ar deposits or ...
Optimisation of Blasting in Narrow Reefs Mines in South Africa FJ Fourie, T Zaniewski, ... • Gold losses • Resistance to change culture • Cost cutting and the cheapest is the best approach Solutions • Drive for new blasting technologies • 5 % of research budget allocated for
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24-09-2016· blasting designs in narrow gold reef mines pdf Break it Better - Mine Blast Fragmentation - International, Know More "Blasting is the pillar of open pit mining and is directly influenced by many factors, both in design and terrain, and can influence much of the ultimate mine design and cost realization The technology exists to reduce analysis time and build sufficient models …
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Conventional mining methods 1 m stope width drill and blast labour intensive Longhole mining drill and blast <1 m stope width, ~70-80cm can be partly mechanised Narrow reef autonomous mining designed to be <50cm high autonomous –minimal human control mines only ore –no waste Savuka Gold Mine Underground core drilling Burnstone Gold Mine ...
Narrow Vein Mining Conference Ballarat, Vic, 14 - 15 October 2008 3 STRATEGIES FOR MINIMISING AND PREDICTING DILUTION IN NARROW VEIN MINES – THE NARROW VEIN DILUTION METHOD-1.00-0.50 0.00 0.50 1.00 1.50 2.00 2.50 3.00 0 5 10 15 20 25 30 35 40 N) FIG 7 - Scatter plot showing the poor correlation between N and
corresponding face mining system, which led to the design ... Earlier experience at Telfer The proposed face mining system was based on a mining method that is practised at Telfer Gold Mine in Western Australia. Telfer has a series of domed reefs that dip at ... LONG HOLE DRILLING APPLIED TO NARROW REEF MINING 201 inspected.
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Losses of gold can be as much as 10-15% ~ and to introduce selective mining to. Optimization of blasting in narrow reef mines in South Africa. Gold mines and the older platinum mines are similar insofar as they utilize relatively unskilled labour to mine narrow reefs, having a seam height of the order of 1 m at dips between 5 and 30 degrees ...
Blasting Designs In Narrow Gold Reef Mines Pdf Mining by rock cutting in narrow reefs SAIMM Mining by rock cutting in narrow reefs R. PICKERING*, A. SMIT* and K. MOXHAM† *†Lonmin Platinum Since the early 1970s research has been ongoing to develop a cost-effective way of continuously mining the narrow reef, hard rock, typical of South African gold and platinum mines.