The invention discloses a sublevel fill-mining method. By utilizing the natural angle of repose characteristics of caving ores and dry mine fill and according to medium hole drilling device-adapted height and the ore-permitted exposed area, space and time at present, sublevel mining is carried out from the bottom to the top in the open-field state and the dry mine fill is adopted for filling ...
INTRODUCTION The sublevel stoping mining method is usually applied to a relatively steeply dipping, competent ore body, surrounded by competent wall rock. Ore is produced by drilling and blasting longholes, which can range from 50 mm (2 in.) to 200 mm (7% in.) diam, with lengths up to 90 m (300 ft).
a level (compare raise). 1.3 MINING METHODS 1.3.1 Introduction Once an ore body has been probed and outlined and sufficient information has been collected to warrant further analysis, the important process of selecting the most appropriate method or methods of mining can
The first section gives an overview of underg round mining methods and practices as used commonly in underground mines, including classification of underground mining methods and brief explanations of the techniques of room-and-pillar mining, sublevel stoping, cut-and-fill, longwall mining, sublevel caving, and block caving. The second
SUB-LEVEL OPEN STOPING DESIGN OF THE O640, L651 AND N659 SUB-LEVEL OPEN STOPES IN THE 3000 OREBODY OF THE MOUNT ISA COPPER MINES, QUEENSLAND, AUSTRALIA L. SLOANE Presented in partial fulfilment of the requirements for the degree M.ENG (MINING ENGINEERING) IN THE FACULTY OF ENGINEERING DEPARTMENT OF MINING UNIVERSITY
Mar 01, 2021 In the drift-and-fill method (see Fig. 1), the volume of backfills with 20%, 10%, and 0% cement content account for 16.7%, 41.65%, and 41.65% of the total backfill volume, respectively.It is estimated that the total mine fill cost is about 8.93 $/m 3, and from this total amount, 16.5% is the fill cost with 20% cement content.. The 10% and 20% cement content backfill used at the mine may be ...
Method Selection Process Ten basic mining methods, not including hydraulic or solution mining, should be con sidered in any selection process 1) Open pit - a method where mining starts at the surface and waste is removed to uncover the ore includes strip mining and quarrying. 2) Block caving - a method in which columns
Current longwall mining method applied in the mine The current method used in the above-mentioned mines is a sub-level longwall caving-retreat method. In this method, the face is formed perpendicular to the seam strike and implemented in the form of slices 7.5 m thick from the top downwards (Figure 1). Because the geotechnical properties
Sep 09, 2021 COURSE DESCRIPTION This course provides an introduction to the discipline of mining and other relevant enabling sub-disciplines (mine geology, mine survey, mineral processing) the various facets of mining within the mining industry importance of sustainable mining practices from exploration to mine closure and a practical understanding of the key elements of each of the major mining
Sub-level caving is an effective mining method for steep orebodies, allowing maximum extraction from the orebody with a high degree of safety. LKAB places great emphasis on refining every element of the underground mining process, in order to make it as efficient as possible.
The present invention relates to a method in mining by sublevel caving in which in a development phase, on one side of the orebody to be mined, i.e. the haulage wall side or, in case of an inclined orebody, preferably the foot wall side, are driven haulage drifts or shafts, for example haulageways inclined relative to the horizontal plane, and from said drifts or shafts are driven cross-cuts ...
Mar 24, 2021 Sublevel cave mining starts at the top of a deposit and progresses downwards level by level through the deposit as the ore is extracted. The top-down mining sequence is a major advantage because it reduces both the lead-time to production and enables capital development expenditure to be spread over the life of the operation which is usually the best way of increasing NPV and IRR for a
Oversize Fragmentation Study in a Sub-Level Cave Mining Method. Prepared by Mario Paventi, Mike LeBlanc and Chris Preston 1999. Executive Summary. Mines Research investigated the factors contributing to oversize fragmentation in the Sub-Level Cave area at Stobie Mine. Following analysis of the blasthole data the Task Team engineered a blast ...
Mar 03, 2017 Experience from LKAB, Sweden - Sub-level caving (SLC) is an important mass mining method, used at LKAB. The caved rock or debris at the SLC interface reduces the fragmentation and the swelling of the blasted ring and it dissipates the explosive energy. These phenomena may immobilize the blasted ring, causing ore losses.
Dec 14, 2018 Mining rates will gradually build up over the first half of 2019 and are expected to reach nameplate capacity of 200,000t per month by the end of June 2019. Sub-level caving is an advanced and highly efficient low-cost bulk underground mining method that provides early access to ore. Mining commences at the top of the deposit and develops ...
as mining nears completion, to allow the natural collapse of the roof. Sublevel Stoping Sublevel stoping is a mining method in which ore is blasted from different levels of elevation but is removed from one level at the bottom of the mine. Before mining begins, an ore pass is usually drilled from a
12.5 Mining method selection-The mining principles and methods have evolved to meet the geomechanical and operational problems of various cases.-Final choice of mining method will reflect both the engineering properties of the orebody and its setting, and the engineering attributes of the various methods such as mining scale, production rate ...
May 01, 2016 The best Mining method (Single level caving) was then subjected to cost analysis to establish its viability. The total cost calculated for the project was $ 2,990,869.92 and the expected revenue is $ 4,782,590.77 giving a payback period for the investment of approximately 6 months.
Aug 04, 2017 1. Overview Avoca Method of mining is a variation of sublevel stoping method with the introduction of waste rockfill as backfill. This method is popular in high grade epithermal vein deposits where the strength and conditions of the walls of the open stopes are weak to moderate and require backfilling of waste rock to stabilise the walls, minimise the ore dilution and maximise the ore recovery.
It is therefore the best method to turn a carefully planned drill and blast design into reality. No need for undercuts . When conventional drilling methods are used for sub-level stoping, with long distances between the levels, it is common to drill an undercut to avoid the risk of high blast hole deviation.
Dec 16, 2019 In this method, ore is removed by the mining, or undercutting, of a thin horizontal layer at the mining level. Gravity and internal stresses within the rock mass are two of main functions in block caving. Sublevel caving (SLC)
Pajingos long-established methods of mining have been Narrow-Vein stoping and modified (bottom up) Avoca. Alternate methods of mining are being investigated for viability of production. A method of Modified Sub-Level Shrinkage (MSLS) consisted of incorporating traditional Sub-Level Caving methods into previously mined and backfilled zones.
Sub-level cave mining is a mining method that starts at the top of the orebody and develops downward. Ore is mined from sub-levels with regular intervals. MGBs approval of the mining method includes the three-year development and utilization work program on the mine from the second half of 2019 to the first half of 2022, as well as the ...
Ventilation- In this method through ventilation in the active mining area is not possible. On a conventional sublevel, an auxiliary fan is installed at the entrance of the production drift. Ducting is used to take clean (or relatively clean) air to the end of the drift, where mining operations are carried out.
Abstract. Sublevel stoping mining methods are very popular in Canadian metal mines since they enable maximum ore recovery due to pillar-less mining. Sublevel stoping mining methods are generally employed to extract steeply dipping tabular ore deposits characterized by relatively long strikes and having various thicknesses.
Sub-level caving also allows for a slightly more selective extraction of the orebody than is attainable through block or panel caving. Production rates achieved in sub-level caving operations are typically lower than for block caves but higher than for stoping methods. CAVING requIremeNts Caving is a non-selective, bulk mining method.
Stoping Methods - General description, applicability, Oprations involved and associated equipments for room pillar mining, Stope and pillar mining, stope and piellar mining, shrinkage, stoping, sub level stoping ,cut and fill stoping, VCR methods, Sub level caving and caving .
Oct 25, 2017 When applying sub-level caving method to the mining of steeply dipping narrow veins (particularly stock worked narrow veins with poorly defined host rock contacts), the flow of ore can be assumed similar to granular material flow that is not only constrained by the end walls, but also affected by the hangingwall and footwall (a confined flow ...
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