The present paper deals with an original way to reduce the environmental damage caused to land and air resources by surface coal mines with external dumping, due to the transition to internal dumping with filling the worked out space of the surface mine with overburden. The basic principle of the proposed idea is the transition from the …
The objective of this work was to simplify the mining method selection process, while at the same time modernizing the technology, to facilitate quick decisions, based on minimal information, in the early phases of mining studies.
As a result, more companies are adopting bulk non-entry underground min-ing methods, such as sublevel open stoping and vertical crater retreat, mining methods that can be easily mechanized and auto-mated [6]. In Canada, it was reported in 1993 that about 51% of the mines were operating with these open stope mining methods [7].
A longitudinal retreat stoping method will be used for the underground mining operation. It was selected to exploit the five mineralised zones, which comprise several narrow veins.
The direction of mining is longitudinal. The current practice of not following the mining sequence because of extracting high ore grade first significantly influences unplanned dilution and low recovery because of the high stress blocks created within the orebody as shown in Figure 12.
A great deal has been learnt throughout development and operation of the SLR method at Diavik. This paper examines considerations for ventilation, production drilling and …
This paper discusses the effects of two placement methods being practiced by mines and numerical modelling is used as a tool to evaluate stability of the backfill …
Longitudinal longhole retreat is a branch of the generic mining method known as sublevel stoping. For longitudinal retreat the long axis of the stope is along (or parallel) to the strike of the orebody.
The Obuasi mine - longitudinal retreat mining method application and challenges, in Proceedings Narrow Vein Mining 2012, pp 59-70 (The Australasian Institute of Mining and Metallurgy: Melbourne).
This course refers to the generic mining method of sublevel stoping. The most commonly used sublevel stoping mining methods are sublevel open stoping, long …
The basic 18 principle of the proposed idea is the transition from deepening longitudinal mining method for 19 development of inclined and steep coal seam strata to lateral ones.
Sub-level long-hole stoping method with multiple longitudinal panels utilizing delayed backfill is approximately 90% of the production.
The Obuasi Mine has been in operation for the past 100 years. Within this period a host of mining methods have been employed during its various changing phases. The causes for the changes are multiple, ranging from orebody capability, dynamics, technology, safety, economics, production levels, geotechnical, etc. Mining methods applied have also …
"The use of data mining methods for the prediction of dementia: evidence from the english longitudinal study of aging" by Yang and Bath is a study that evaluates various combinations of ...
7/17/2018· The mining method selected is long-hole with longitudinal retreat on panels with minimum dimensions of 20 (length) x 20 (height) metres and minimum thicknesses of 3.5 to 4.0 metres.
ABSTRACT: This paper discusses the main causes for unplanned ore dilution in longhole mining and possible mitigation measures. It reports on the results of a case study of an underground mine that uses the longitudinal retreat method for the extraction of a narrow gold-silver orebody. The study is conducted with finite difference software FLAC3D. The …
4.3.2: Underground Mining Methods. Underground mining methods become necessary when the stripping ratio becomes uneconomical, or occasionally when the surface use of the land would prohibit surface mining. Underground methods are traditionally broken into three classes: unsupported, supported, and caving methods.
Steeply dipping, vein and tabular orebodies are traditionally extracted with longitudinal retreat mining methods such as Eureka and Avoca in a bottom-up sequence with delayed backfill.
Longitudinal open stope mining, or sublevel retreat (after Potvin and Hudyma, 1989). Much of the development necessary for this mining method can be kept in the orebody.
Pillar extraction, (also referred to as retreat mining; pillar recovery; stooping; pillar robbing; and bord and pillar second workings) is the practice of forming a series of pillars and then partially or totally extracting some or all of the pillars, usually with mining operations retreating out of a panel. There are a number of basic pillar …
Lapa Mining Method - 26m Longitudinal Retreat AGNICO EAGLE 4.2m
A combination of longitudinal retreat and transverse sublevel caving was proposed as a suitable mining method for C. Anticline. The cavability assessment for the proposed sublevel caving showed an increased probability of hanging wall caving as mining progresses. The proposed mining method was found to be economically viable.
Steeply dipping, vein and tabular orebodies are traditionally extracted with longitudinal retreat mining methods such as Eureka and Avoca in a bottom-up sequence with delayed backfill.
This research includes the study of the mining method adopted at Bogala Graphite Mines and its suitability compared with other mining methods used in the mining industry. The mining method adopted in Bogala mines has been assessed through this study. It mainly focus on the rock mechanics and financial aspects with comparisons to the mining …
The mining subsidence has led to increased mining cost and cycle times due to the closure of 182 ml decline on the eastern limb and 175 ml truck route on the southern limb and disturbance on ...
The Casposo-Manantiales complex (Casposo Mine) was placed on care and maintenance during the June 2019 quarter and exploration activities that commenced during the December 2019 quarter have been ongoing with the goal of recommencing processing operations. Related Asset.
Obuasi is an underground operation with the main accesses into the mine consisting of shafts and a single access decline. On receipt of the requisite approvals from the Government of Ghana, the Obuasi redevelopment project began in early 2019. Phases 1 and 2 of the redevelopment project have been completed, bringing capacity to 4,000tpd …
The long hole open stoping (LHOS) method will be used for underground mining following a longitudinal retreat approach, with a bottom-up stope sequence. Underground mining will begin after the start of open-pit operations at Goliath, with the first ore from the underground operation expected in year one and sustained commercial …
Longhole Stoping is a popular large scale underground mining method for metalliferous mine known for its ability to simplify stope sequencing.
Based on the Triangle deposit's orebody characteristics, a longitudinal retreat long-hole mining method was selected.
longitudinal retreat mining method - greenrevolution.in. Sublevel open stoping, by longitudinal retreat, is the most commonly used stoping method.Longitudinal retreat mining of deep, narrow vein lenses under sand fill at the Golden Giant mine resulted in shear failure parallel to the ore - HW contact [Figure 8b12].
The PLS uranium project will be operated as an underground mine using longhole stoping method in a longitudinal retreat orientation. The completed stopes will be backfilled with cemented rock fill.
Longitudinal retreat mining methods are commonplace in narrow vein Canadian mines. The slender shape of the stopes created using this method can cause instability along the walls. Due to the fact that height is often the largest dimension, this instability can cause large amounts of waste rock, or dilution, to slough into a newly blasted stope.
The basic principle of the proposed idea is the transition from the deepening longitudinal mining method for the development of inclined and steep coal seam strata to lateral ones.
The predominant method of longwall mining in Australia is longwall retreat system. In retreat longwall mining, two sets of entries are driven between 100 to 250m apart.
The following methods were suggested by traditional mining method selection tools: • • • • • Sublevel open stoping Cut-and-Fill stoping Vertical crater retreat Stull stoping/square set stoping Drift-and-Fill 50 fThese methods were compared in terms of safety, suitability, production rate, dilution & recovery and flexibility.
Longitudinal open stope mining, or sublevel retreat (after Potvin and Hudyma, 1989). Much of the development necessary for this mining method can be kept in the orebody. This is a relatively ...
