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Selecting, repairing and modifying a secondhand TBM
ROCK BREAKAGE:MACHINE EXCAVATION
957246 Blast design at Maniyar A. R. Babu & G. R. Adhikari, Tunnels & Tunnelling, 27(3), 1995, pp 44-46. Blasting operations and the design of a 350 m long tunnel driven by drill and blast at the Maniyar hydroelectric power station in India are detailed. Particular emphasis is on the procedures used to achieve maximum pull and minimum overbreak while ensuring safety of nearby structures. Geotechnical studies, blast design for exit end, controlled blasting at intake, full face blast design, vibration control, and results of a comparative study of the headings and full face blasts with respect to cycle time and efficiency are outlined. (J.M.McLaughlin)
957247 Study of the mechanisms of notched-holes blasting by model experiment (in Chinese) Yang Renshu, Song Junsheng & Yang Yongqi, Journal China Coal Society, 20(2), 1995, pp 19%200. The mechanism of notched-hole blasting and crack propagation was studied by means of an ultra-dynamic measuring system and dynamic photoelastic apparatus. This report investigates directional crack initiation, propagation and termination from audio visual recording of one borehole blasting process. Qualitative and quantitative analysis of the dynamic process explain the mechanism of notched-hole blasting. A fracture criterion is also constructed. The parameters of groove and explosition are given. (English summary)
Crushing and grinding 957248 A standardised procedure for performance analysis of crushers S. Bhattacharya & D. D. Misra, Mine & Quarry, 24(3), 1995, pp 9-11. Performance analysis of industrial crushers is a difficult task. No standardised methodology or parameters is available for this purpose. This work summarises the difficulties experienced by the authors, in the absence of any standardised norm, while doing the performance analysis of a large number of crushers operating in Indian Coal Preparation Plants. On the basis of the experience gained from the above work a precise methodology is proposed to standardise the performance evaluation of crushers. (Authors)
957249 Crusher and incfined conveyor system at Detour Lake Mine P. Hansman, CIM Bulletin, 88(990), 1995, pp 46-49. Place Dome Canada's Detour Lake Mine is a low-grade gold producer located in northeastern Ontario. Production is targeted for 2850 tonnes of ore per day. As reserves and mining areas continued to be found below and far to the west of the shaft, it became necessary to review and upgrade the materials handling facilities. This paper deals with the selection, design and construction of an underground crusher and conveyor system capable of handling up to 450 tonnes per hour from the lowest existing level in the mine. (Author)
957250 Case made for high-pressure roll-grinding in gold plants N. Patzelt, H. Knecht & W. Baum, Mining Engineering, 47(6), 1995, pp 524-529. The high-pressure grinding roll was introduced about 10 years ago and has established itself in many applications. Most of these machines are used in grinding circuits in the
337A
cement industry. A few operate in conventional mineralprocessing plants. An exception is diamond-ore processing in South Africa and Australia. There are several reasons why high-pressure grinding rolls have not been used more extensively in the mining industry. However, in addition to capacity increases and power savings, mining operations can profit from the significant metallurgical benefits of highpressure grinding rolls. Development work has shown that the most significant advantages can be gained during gold-ore treatment. Several key features of high-pressure roll grinding have been identified for gold operations. On the metallurgical side, they include microfracturing, lower Bond Work Index, increased cyanide permeability and better gold extractions. From an operational standpoint, the key features are low wear, high availability, push-buttom control for size and throughout and easy operation. From an economic standpoint, high-pressure roll grinding features lower energy requirements, lower wear steel costs, reasonable equipment costs, low installation costs, low space requirements, proven technology and performance guarantees. (from Authors)
957251 Performance improvements in industrial rod milling operations R. E. McIvor, CIM Bulletin, 88(988), 1995, pp 90-91. Since the publication of a literature review on this topic 0VlcIvor and Finch, 1986), the author has been involved in more than 30 rod milling efficiency tests at seven different milling operations. There have also been several interesting additional articles on rod milling found in the literature. This update describes the most important findings from investigations carried out since the previous review, as well as developments in the techniques used to evaluate the grinding efficiency of rod mills. (Author)
Machine excavation 957252 Mechaalsed drivage J. Chadwick, Mining Magazine, 172(4), 1995, pp 227-236. Modern mines require ever faster development methods. This is especially true of today's long-wall coal operations which have an enormous appetite for fast drivage, but the hard rock sector too is working hard to develop new mechanised, and continuous, systems. Amongst the work that is ongoing at present is the development of the roadheader to widen its application in hard rock mining; bolter/miners for coal mining and other continuous mining systems for both hard and soft rock. This article details the current developments in roadheaders, continuous miners, TBMs, mobile miners and back-up equipment. (Author)
957253 Selecting, repairing and modifying a secondhand TBM J. Roby & C. Walford, Tunnels & Tunnelling, 27(3), 1995, pp 39,41.42. Examines in detail the process of selecting, repairing and modifying a second-hand tunnel boring machine (TBM) for a particular project. The disadvantages of second-hand machines, locating second hand TBMs, appropriate reconditioning, modifications and their limitations, choosing a rebuilder or consultant, and the leasing option are considered. (J.M.McLaughlin)
957254 New developments in Polish built miningmachinery L. Jaroo, Coal International, 243(3), 1995, pp 112-116. The author describes some of the advanced equipment currently being built in Poland for the mining of coal. Plant
957246 Blast design at Maniyar A. R. Babu & G. R. Adhikari, Tunnels & Tunnelling, 27(3), 1995, pp 44-46. Blasting operations and the design of a 350 m long tunnel driven by drill and blast at the Maniyar hydroelectric power station in India are detailed. Particular emphasis is on the procedures used to achieve maximum pull and minimum overbreak while ensuring safety of nearby structures. Geotechnical studies, blast design for exit end, controlled blasting at intake, full face blast design, vibration control, and results of a comparative study of the headings and full face blasts with respect to cycle time and efficiency are outlined. (J.M.McLaughlin)
957247 Study of the mechanisms of notched-holes blasting by model experiment (in Chinese) Yang Renshu, Song Junsheng & Yang Yongqi, Journal China Coal Society, 20(2), 1995, pp 19%200. The mechanism of notched-hole blasting and crack propagation was studied by means of an ultra-dynamic measuring system and dynamic photoelastic apparatus. This report investigates directional crack initiation, propagation and termination from audio visual recording of one borehole blasting process. Qualitative and quantitative analysis of the dynamic process explain the mechanism of notched-hole blasting. A fracture criterion is also constructed. The parameters of groove and explosition are given. (English summary)
Crushing and grinding 957248 A standardised procedure for performance analysis of crushers S. Bhattacharya & D. D. Misra, Mine & Quarry, 24(3), 1995, pp 9-11. Performance analysis of industrial crushers is a difficult task. No standardised methodology or parameters is available for this purpose. This work summarises the difficulties experienced by the authors, in the absence of any standardised norm, while doing the performance analysis of a large number of crushers operating in Indian Coal Preparation Plants. On the basis of the experience gained from the above work a precise methodology is proposed to standardise the performance evaluation of crushers. (Authors)
957249 Crusher and incfined conveyor system at Detour Lake Mine P. Hansman, CIM Bulletin, 88(990), 1995, pp 46-49. Place Dome Canada's Detour Lake Mine is a low-grade gold producer located in northeastern Ontario. Production is targeted for 2850 tonnes of ore per day. As reserves and mining areas continued to be found below and far to the west of the shaft, it became necessary to review and upgrade the materials handling facilities. This paper deals with the selection, design and construction of an underground crusher and conveyor system capable of handling up to 450 tonnes per hour from the lowest existing level in the mine. (Author)
957250 Case made for high-pressure roll-grinding in gold plants N. Patzelt, H. Knecht & W. Baum, Mining Engineering, 47(6), 1995, pp 524-529. The high-pressure grinding roll was introduced about 10 years ago and has established itself in many applications. Most of these machines are used in grinding circuits in the
337A
cement industry. A few operate in conventional mineralprocessing plants. An exception is diamond-ore processing in South Africa and Australia. There are several reasons why high-pressure grinding rolls have not been used more extensively in the mining industry. However, in addition to capacity increases and power savings, mining operations can profit from the significant metallurgical benefits of highpressure grinding rolls. Development work has shown that the most significant advantages can be gained during gold-ore treatment. Several key features of high-pressure roll grinding have been identified for gold operations. On the metallurgical side, they include microfracturing, lower Bond Work Index, increased cyanide permeability and better gold extractions. From an operational standpoint, the key features are low wear, high availability, push-buttom control for size and throughout and easy operation. From an economic standpoint, high-pressure roll grinding features lower energy requirements, lower wear steel costs, reasonable equipment costs, low installation costs, low space requirements, proven technology and performance guarantees. (from Authors)
957251 Performance improvements in industrial rod milling operations R. E. McIvor, CIM Bulletin, 88(988), 1995, pp 90-91. Since the publication of a literature review on this topic 0VlcIvor and Finch, 1986), the author has been involved in more than 30 rod milling efficiency tests at seven different milling operations. There have also been several interesting additional articles on rod milling found in the literature. This update describes the most important findings from investigations carried out since the previous review, as well as developments in the techniques used to evaluate the grinding efficiency of rod mills. (Author)
Machine excavation 957252 Mechaalsed drivage J. Chadwick, Mining Magazine, 172(4), 1995, pp 227-236. Modern mines require ever faster development methods. This is especially true of today's long-wall coal operations which have an enormous appetite for fast drivage, but the hard rock sector too is working hard to develop new mechanised, and continuous, systems. Amongst the work that is ongoing at present is the development of the roadheader to widen its application in hard rock mining; bolter/miners for coal mining and other continuous mining systems for both hard and soft rock. This article details the current developments in roadheaders, continuous miners, TBMs, mobile miners and back-up equipment. (Author)
957253 Selecting, repairing and modifying a secondhand TBM J. Roby & C. Walford, Tunnels & Tunnelling, 27(3), 1995, pp 39,41.42. Examines in detail the process of selecting, repairing and modifying a second-hand tunnel boring machine (TBM) for a particular project. The disadvantages of second-hand machines, locating second hand TBMs, appropriate reconditioning, modifications and their limitations, choosing a rebuilder or consultant, and the leasing option are considered. (J.M.McLaughlin)
957254 New developments in Polish built miningmachinery L. Jaroo, Coal International, 243(3), 1995, pp 112-116. The author describes some of the advanced equipment currently being built in Poland for the mining of coal. Plant