Fig. 16. Alignments considered for the assessment of pillar SF values - "Sub-Level Stoping in an Underground Limestone Quarry: An Analysis of the State of Stress in an Evolutionary Scenario"
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The aim of this study was to evaluate the state of stress of a „voids-pillar" structure excavated by means of the sub-level stoping method in an underground limestone quarry near Bergamo (Italy).
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The method is commonly known throughout the world as open stoping, sublevel stoping, longhole or blasthole stoping. The essential common elements of sublevel stoping are …
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The basic method, described in the following pages, may be modified to meet conditions where one or more factors are not in accord with normal sub-level stoping …
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underground limestone quarry near Bergamo (Italy) Sub-Level Stoping in an Underground Limestone Quarry: An Analysis of the State of Stress in an Evolutionary Scenario FORM 43-101F1 TECHNICAL REPORT PRELIMINARY FEASIBILITY STUDY FOR THE ARENAL DEEPS UNDERGROUND MINE En cada bloque de explotación se …
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Fig. 17. Proposal for the amendment of the exploitation - "Sub-Level Stoping in an Underground Limestone Quarry: An Analysis of the State of Stress in an Evolutionary Scenario"
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Backfilling is also used with sublevel stoping and VCR mining, with crushed rock introduced as a complement to sand fill. The crushed and screened rock, produced in a nearby quarry, is delivered underground through special backfill raises where it is loaded on trucks and delivered to the stopes where it is dumped into special fill raises.
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The aim of this study was to evaluate the state of stress of a „voids-pillar" structure excavated by means of the sub-level stoping method in an underground …
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Fig. 4. Right: Exploitation with 3 sub-levels and one drilling tunnel per sub-level; left: The same scheme with 2 drilling tunnels per sub-level (Mancini et al., 2003; Mancini et al., 2005) - "Sub-Level Stoping in an Underground Limestone Quarry: An Analysis of the State of Stress in an Evolutionary Scenario"
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The term "stoping practice" is employed in this bulletin to cover details of stoping procedure rather than the broader and more fundamental considerations that are covered by the term "stoping method." Variations of Principal Stoping Methods. Some of the variations of stoping methods have been discussed already.
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Fig. 9. Alignments considered for the assessment of pillar safety factor values - "Sub-Level Stoping in an Underground Limestone Quarry: An Analysis of the State of Stress in an Evolutionary Scenario"
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TABLE 4 - "Sub-Level Stoping in an Underground Limestone Quarry: An Analysis of the State of Stress in an Evolutionary Scenario"
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The quarry has been in operation since 1927; at present, exploitation is carried out underground via the sub-level stoping method.
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The underground operation utilizes a sublevel open stoping method developed with large-diameter blastholes. Initially, blasting utilized AN/FO with tracer lines of 25-grain ″E″ cord and ...
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Fig. 10. Trend of SF for the 4 alignments with reference to the M-C strength criterion - "Sub-Level Stoping in an Underground Limestone Quarry: An Analysis of the State of Stress in an Evolutionary Scenario"
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Celem pracy było zbadanie stanów naprężeń w strukturach składających się z filarów i pustek po wybieraniu wapienia w podziemnym kamieniołomie w pobliżu Bergamo (Włochy), metodą wybierania podpoziomowego. Zarówno obecna struktury kamieniołomu (komory powstałe po dotychczasowym wydobyciu) oraz możliwe scenariusze na przyszłość …
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Sub-Level Stoping in an Underground Limestone Quarry: An Analysis of the State of Stress in an Evolutionary Scenario
ادامه مطلب
The aim of this study was to evaluate the state of stress of a „voids-pillar" structure excavated by means of the sub-level stoping method in an underground limestone quarry near Bergamo (Italy). … Expand
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means of the sub-level stoping method in an underground limestone quarry near Bergamo (Italy). Both the current structure of the quarry (i.e. the rooms exploited till now) and a possible future ...
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In figure 119, direct stoping costs are plotted against approximate vein or stoping widths, in feet, for a number of mines employing, respectively, open stoping, shrinkage stoping, and cut-and-fill stoping, and thus indicate the effect of width upon direct stoping cost per ton of ore.
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TABLE 2 - "Sub-Level Stoping in an Underground Limestone Quarry: An Analysis of the State of Stress in an Evolutionary Scenario"
ادامه مطلب
The aim of this study was to evaluate the state of stress of a „voids-pillar" structure excavated by means of the sub-level stoping method in an underground limestone quarry near Bergamo (Italy).
ادامه مطلب
The aim of this study was to evaluate the state of stress of a „voids-pillar" structure excavated by means of the sub-level stoping method in an underground limestone quarry near Bergamo (Italy).
ادامه مطلب
TABLE 5 - "Sub-Level Stoping in an Underground Limestone Quarry: An Analysis of the State of Stress in an Evolutionary Scenario"
ادامه مطلب
limestone underground quarry sub level stoping. Design criteria for production blasting in an … The quarry is in operation since 1927: at present,the exploitation is carried out
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Among underground mining methods, sublevel stoping are a commonly used method in large-scale mining. It is a versatile and productive method that is primarily used for steeply deeping orebodies with regular shape, defined ore boundaries and competent ore and host rock.
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Sublevel Stoping at a large underground quarry: the improvement of the development and exploitation design ... reached the targeted full production level from underground stopes, and is planning ...
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Sublevel Stoping at a large underground quarry: the improvement of the development and exploitation design ... sub-level spacing, and the size of the production blasts) are under study. ...
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Fig. 1. 3D scheme of the rock body, surface exploitation and underground exploitation; the increase in waste removal required to continue surface exploitation can be observed (Mancini et al., 2005) - "Sub-Level Stoping in an Underground Limestone Quarry: An Analysis of the State of Stress in an Evolutionary Scenario"
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TABLE 3 - "Sub-Level Stoping in an Underground Limestone Quarry: An Analysis of the State of Stress in an Evolutionary Scenario"
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The quarry has been in operation since 1927; at present, exploitation is carried out underground via the sub-level stoping method. Exploitation involves two …
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