WATER CONTROL IN UNDERGROUND MINES-GROUTING OR DRAINAGE? by V. STRASKRABA, and S. EFFNER TRC HYDRO-GEO CONSULTANTS 165 S. UNION BLVD., SUITE 400 LAKEWOOD, COLORADO, USA 80228 ABSTRACT Mine dewatering and grouting are the two most common methods of ground water control in underground mining. Both methods …
Definition of sublevel stoping. i. In this mining method, the ore is excavated in open stopes, retreating from one end of the stope toward the other. The orebody is developed first by a series of sublevel drifts above the main haulage level. The sublevels are connected by a starting raise at one end of the stope and by a passageway raise for ...
Cut-and-fill stoping is applicable to the mining of firm ore enclosed within walls, one or both of which are weak and heavy. The deposits may be tabular in form, dipping at angles steeper than the angle of repose of the broken ore (or flatter, if scrapers are employed for moving the ore in the ore passes), or to wide, thick ore bodies or masses.
vertebrate such as its body temperature, skin cover, method of reproduction, ability to ﬂy, and ability to live in water. Although the attributes presented in Table 4.1 are mostly discrete, the attribute set can also contain continuous features. The class label, on the other hand, must be a discrete attribute.
In any discussion of Methods of Underground Mining Comparison, one is repeatedly confronted with the difficulty of dealing with so many variable conditions. It is not an exact science and in the choice of a method each varying factor has a certain weight, which, in many cases, experience alone can determine.
Oct 23, 2014· Caving Underground Mining Methods (longwall, Sublevel caving, & Block caving) 1. This material is intended for use in lectures, presentations and as handouts to students, and is provided in Power point format so as to allow customization for the individual needs of course instructors.
How to Address Overfitting Pre-Pruning (Early Stopping Rule) Stop the algorithm before it becomes a fully-grown tree Typical stopping conditions for a node: Stop if all instances belong to the same class Stop if all the attribute values are the same More restrictive conditions: Stop if number of instances is less than some user-specified ...
DEWATERING – CONTROL OF GROUNDWATER Construction of buildings, powerhouses, dams, locks and many other structures requires ... the depth of the water table below ground level and the amount by which it has to be lowered, the proposed methods of excavation and ground support, the ... this method is used when hard or variable soil conditions ...
Shrinkage stoping is a mining method used for steeply dipping, narrower ore bodies with self supporting walls and ore. It is an overhand mining method that relies on broken ore being left in the stope to be used as the "working floor" and to support the walls.
This method can be used in wider deposits, as well, by drilling two adjacent access ramps and cutting two adjacent drifts, often called drift and fill [sources: Mining Know-How]. Cut and fill is for hard rock, as it doesn't feature the support mechanisms inherent in and central to a method like room and pillar.
Jan 13, 2013· You can relax stopping rules to "overgrow" decision trees and then prune back the tree to the optimal size. This approach minimizes the probability that important structure in the data set will be overlooked by stopping too soon. CART incorporates both testing with a test data set and cross-validation to assess the goodness of fit more accurately.
Some types of mining are more harmful than others. For people living in poor areas, mining provides a way to get money for food and other necessities. Enjoyed the Easy Earth Science for Kids Website all about Mining info? Take the FREE & fun all about Mining quiz and download FREE all about Mining worksheet for kids. For lengthy info click here.
Sublevel Stoping Underground Mining Methods. ... ascending raises are open for connection to the upper level. ... started is hard to stop and much of the infrastruc ture and mine reserves.
64Underground Mining Methods - Sublevel Stoping Avoca Mining (Longitudinal Mining) • El método Avoca permitirá cortes de acuerdo a las condiciones de estabilidad de la caja prevaleciente. • Son utilizados en cuerpos de menor competencia y mayor continuidad en la corrida del mineral.
Open-Pit Mining By Tony Paisana Description Open-pit mining is surface mining in which huge portions of earth are dug from the surface to extract the desired mineral ... – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 3b008b-MWZjM
Subsub Level Stopping Mining Method Ppt. Related Information: Stoping - Wikipedia. The specific method of stoping depends on a ore body and then drive horizontal levels through it Stoping then takes stoping, mining proceeds (PDF) Sublevel Stoping Underground Mining Methods.
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Sublevel stoping..Underground mining methods 1. Hassan Z. Harraz [email protected] 2014- 2015 This material is intended for use in lectures, presentations and as handouts to students, and is provided in Power point format so as to allow customization for the …
Drill and blast mining methods permit a degree of flexibility during the course of mining and allow for changes in techniques with technical improvements in equipment and blasting techniques. Block cave mining allows very little freedom in change once the layout in complete or virtually once the design has been approved.
Sublevel stoping: configuration method in stopes where the ore is detonated by drilling a fan or parallel; large part of the ore is removed from the stope as it is being detonated, leaving open stope.
The modified Avoca mining method was chosen for zone 1A. This method eliminates the requirement for a pillar when mining from bottom to top of the zone. Once mining has commenced in a level, mining will follow a typical cycle until that level is completely mined out. This method requires a lot of development prior to production.
Mine Ventilation Systems Practical Mine Ventilation Engineering to be Published by Intertec Puslishing Co. Ventilation is the control of air movement, its amount, and direction. Although it contributes noth - ing directly to the production phase of an operation, the lack of proper ventilation often will cause
What are the main methods of mining? PDF version. There are four main mining methods: underground, open surface (pit), placer, and in-situ mining. Underground mines are more expensive and are often used to reach deeper deposits. Surface mines are typically used for more shallow and less valuable deposits. ...
The essential geomechanical features of longwall and caving methods of mining were outlined in Chapter 12. Longwall and caving methods are distinguished from other mining methods by …
Jan 21, 2018· It is the best video for understanding how to do Sublevel stoping mining method. It is in slide presentation form.
Oct 22, 2014· Sublevel stoping..Underground mining methods 1. Hassan Z. Harraz [email protected] 2014- 2015 This material is intended for use in lectures, presentations and as handouts to students, and is provided in Power point format so as to allow customization for the individual needs of course instructors.
Sublevel Caving . Sublevel Caving is one of many different methods for underground hard rock mining. It is a large-scale mining method suitable for large ore bodies with a steep dip and a rock mass with a host rock in the hanging wall will fracture under controlled conditions.
Not more than 5-9 jobs at one level Human cognitive "bandwidth" only 3 bits=2. 3 =8 Short term memory for most people 5-9 items Poorer planning if "too-fine grained" – dilution of attention The more tasks there are, the more intricate dependencies there will be to keep track of Jobs should be of similar size/complexity