The mining method mostly used is a transverse primary and secondary longhole method. Usually, the development is done two years in advance of the production schedule. Therefore, when narrower areas are encountered in these sectors, the mining method generally used to recover these stopes is the longhole retreat method.

The Obuasi mine – longitudinal retreat mining method application and challenges, in Proceedings Narrow Vein Mining 2012, pp 59-70 (The Australasian Institute of Mining …

CHAPTER 1 Underground Mining Methods and Applications Production Headframe Hans Hamrin* 1.1 INTRODUCTION Ore is an economic concept. It is defined as a concentration of

 · Longitudinal longhole retreat is a branch of the generic mining method known as sublevel stoping and often requires the development of a rise or slot prior t...

longitudinal retreat mining method - … Eagle Mine215 Кб. This method provides the cost advantages of bulk mining, while maintaining a degree of selectivity and operational flexibility.

longitudinal retreat mining method . 161 LONGHOLE LONGITUDINAL RETREAT MINING METHOD The mining This mine utilised an early version of the vertical crater retreat mining method that was . get more info. Vertical Crater Retreat studfilesnet.

VERTICAL CRATER RETREAT MINING IN THE SUDBURY BASIN Vertical crater retreat mining History The vertical crater retreat mining method is based on C.W. Livingston's crater blasting theories and was developed by Inco and CIL Inc. [14].

The broken ore is mucked out by drawpoints or by longitudinal retreat. In order to prevent inbreak of the walls, large size deposits are often divided into many separate stopes by pillars. These pillars may be horizontal or vertical and are in certain cases, recuperated when all the ore has been extracted.

STILL DRAFTING PROJECT REAL 2 1. i DECLARATION I declare that this project is my own work. ... 11 Fig.3.1 Longitudinal Retreat Mining Method (Source: AGA Mine Technical Services Dept.) 3.2.3 Transverse Open Stoping This method is practiced in wide orebody with widths greater than fifteen meters. A haulage drift is developed through waste and ...

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].

Longitudinal longhole retreat stoping was selected as the mining method based on a favourable geometry, geotechnical understanding and the success of the Bulk Sample program completed in 2017.

Mining Terms - Magyver Longitudinal Retreat Mining: A method of mining an orebody beginning at one stope and gradually mining new stopes towards the central ore-handling system. Get More Info.

Sub Level Caving Longitudinal retreat at Ferbasa mine, Brasil Total Chromite production 500,000 tonnes / year Cable bolting supports production drifts Sublevel Caving Sublevel Caving For large scale ore bodies - Bulk mining - Pillar recovery High productivity - Repetitive operations - Mechanization / Automation Drawbacks - High ore losses 20 ...

Factors influencing overbreak in narrow vein longitudinal retreat mining By Rory Hughes, B.ASc ... Narrow vein longitudinal retreating mining methods are especially susceptible to ... One of these factors, stope strike length in narrow vein retreat mining, is not thoroughly explored by existing publications; and, in order to better understand ...

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Transverse mining and longitudinal stripping is a technically practicable and economically beneficial mining method that allows mining operation be carried out with a ... Get Price Coal Mining Methods - …

longitudinal retreat mining method - jalaramjyot.in Geotechnical aspects of vertical crater mining method in ... several Ontario base metal sulphide mines have changed their method of mining to vertical crater retreat ...

For an introduction to metals and mining, please read the following sections for an overview to the industry: Metals & Mining Basic Materials Selecting a Mining Method Selecting which mining method to use is one of the important decisions a mining company has to make. The mining method selected should maximize cost recovery and profitability...

Due to the orebody width and mine sequencing, stopes between the 190 level and the 280 level are mined using the transverse method with primary and secondary stopes, with some longitudinal retreat mining occurring at the extremities of the orebody.

Case Study Resue Mining with eDev ... operation located in Victoria, Australia. The mining method employed is long hole retreat stoping, utilising up and down holes with artificial concrete pillars. Stawell is currently mining the Golden Gift and ... The introduction of eDev™ Electronic Tunnelling System and applying Orica development drill ...

Mining and Processing | Agnico Eagle Mines . Lapa hosts an underground mining operation accessed by a 1,369-metre-deep shaft. Two mining methods are used – longitudinal retreat …

Sublevel Caving Technique - Free download as PDF File (.pdf) or read online for free. An underground mining method used in large, steeply dipping orebodies where the wall rock is of an incompetent nature. Parallel drives are developed in the ore on equally spaced levels. The ore is then drilled and blasted using longholes between levels, often in a circular or fan pattern, on retreat.

Factors influencing overbreak in narrow vein. longitudinal retreat mining By Rory Hughes, B.ASc A thesis submitted to McGill University in partial fulfillment of the requirements for the

Longitudinal longhole retreat QueensMineDesignWiki Longitudinal longhole retreat is a branch of the generic mining method known as This involves the extraction of a bench to a maximum stable unsupported strike Mining For Gold In The 1850s », What Is .

Home / Operations & Development Projects / Operations / Lapa ... Two mining methods have been used – longitudinal retreat with cemented backfill, and locally transverse open stoping with cemented backfill. The dilution rate for mining the reserves has averaged 71%. The production rate has averaged 1,700 tonnes/day.

The thesis describes the selective mining method adapted to tbis type of orebody, and subsequent measures taken to minimize ore dilution. For tbis study, the ... Transverse blasthole in sublevel vertical retreat. Longitudinal blasthole in sublevel vertical retreat. Longitudinallonghole mining horizontal retreat.

Case study for three typical mining projects. SmartEXEC. TM. Ventilation-on-Demand. Ventilation-on-Demand (VOD) is a technology which has been undergoing continuous

From Queen's University Mine Design Wiki 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.

technical report and preliminary economic assessment of the upper beaver gold-copper deposit kirkland lake, ontario, canada for queenston mining inc.

Backfilling is one of the most critical tasks for sublevel stoping mining methods with delayed backfill. Selection of the type of backfill is a significant component of ... narrow vein ore bodies being mined with longitudinal retreat methods with delayed backfill. A detailed review of CRF practice is presented in Section 3. 2. Review of ...

longitudinal retreat mining method - . 16.1 LONGHOLE LONGITUDINAL RETREAT MINING METHOD The mining method ... Removing support during retreat mining can lead to roof falls, ... Room and pillar mining. Chat Online. room and pillar coal mining ppt, fine single roller ...

A retreat transverse/longitudinal long hole stoping method with post backfill was developed utilizing trackless mining equipment. CBI has been able to achieve low mining costs and high productivity using this

Underground mining Methods (PDF Download Available) Full-Text Paper (PDF): Underground mining Methods | ResearchGate, the professional network for scientists. Contact Supplier ... longitudinal retreat mining methods | Sudbury Mining Solutions. As mining…

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longitudinal retreat mining method - … 16.1 LONGHOLE LONGITUDINAL RETREAT MINING METHOD The mining ... This mine utilised an early version of the vertical crater retreat mining method …

Lapa Mining Method - 26m Longitudinal Retreat AGNICO EAGLE 4.2m . Title: PowerPoint Presentation Author: George Dikho Created Date: 3/1/2013 10:26:46 AM

Longitudinal longhole methods are very well suited to retreat mining, and can be planned such that development occurs within the ore itself, reducing development costs, …