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4 MINING 4.1 Mining Method The mining method employed at CBI has been de signed for extraction with complete pillar re covery, while allowing no perceptible surface subsi dence. The mining method is retreat transverse and/or longitudinal long hole stoping with post backfill. The ore body is accessed from a ramp system lo Get Price
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
Aug 28, 2010· The underground mining methods presented in this chapter are mainly applicable to hard rock mines. Softer, non-metallic ores, such as coal, salt, potash, trona (soda ash), and oil shale are often amenable to different methods than those described in this chapter.
EAGLE RIVER MINING COMPLEX . INCLUDING THE EAGLE RIVER GOLD MINE . THE MISHI GOLD MINE AND RELATED INFRASTRUCTURE (According to Regulation 43-101 and Form 43-101F1) LOCATION . Mishibishu Lake Area and Point Isacor . Sault Ste Marie Mining Division . Province of Ontario, Canada . Prepared for: Wesdome Gold Mines Ltd. 8 King Street East, Suite 811
Retreat Mining - When room and pillar mining advances to the end of a panel, retreat mining may begin. Retreat mining is a planned and engineered method of removing all or part of the pillars. The removal of the pillars occurs in the opposite direction (retreat) from which the mining initially advanced.
Longitudinal Retreat Mining: A method of mining an orebody beginning at one stope and gradually mining new stopes towards the central ore-handling system. Long-hole open stope: A method of mining involving the drilling of holes up to 90 feet long into an ore body and then blasting a slice of rock which falls into an open space.
May 20, 2014· The Brody Mine was engaged in retreat mining, which is a common practice in U.S. coal mines, particularly for mines located in the central Appalachian coalfields of southern West ia, eastern Kentucky, and western ia. In retreat mining, large pillars of coal are initially left in place during mining …
configuration is known as retreat mining. Typically, a longwall face retreats at a rate of 50 metres to 100 metres per week, depending on the seam thickness and mining conditions. The coal between the development headings and between the main headings is left in place as pillars to protect the roadways as mining proceeds.
The Obuasi Mine - Longitudinal Retreat Mining Method Application and Challenges. 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 ...
The mining methods are longitudinal retreat with paste backfill, and transverse open stoping with paste or unconsolidated backfill. In its first year of operation, the mine achieved its designed production rate of 1,975 tonnes/day, and by the fourth quarter of 2020, the LZ5 production rate was 2,987 tpd, essentially meeting the targeted rate of ...
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 methods adhered by the Sri Lankan mining industry.
The Obuasi Mine – Longitudinal Retreat Mining Method Application and Challenges F Nsarko and F Owusu-Mensah 59 Challenges Faced by Narrow Vein Graphite Mining and Infl uence of Graphite Infi ll on Wall Stability H S Welideniya and K Ekanayake 71 Geology and Evaluation Review of the Advances Made in Geological
The primary mining method is longitudinal retreat long-hole stoping. Ore is hauled by truck to the Kremzar mill located approximately 0.8 kilometres from the portal of the ramp. The Phase III shaft expansion of the operation to 2,000 tpd is expected to be completed in 2025.
The mining methods are longitudinal retreat with paste-backfill, and transverse open-stoping with paste or unconsolidated backfill. All of the ore is trucked to the surface before being trucked to the LZ5 ore processing plant. The LZ5 ore processing plant processes 2,000 tonnes of ore per day. The plant consists of a two-stage grinding circuit ...
variants of Mechanized continuous retreat (2015). These mining methods (figures 2.1and 2.2) are essentially variants of sublevel open stoping method with delayed hanging wall cave referred to as Mechanized continuous retreat 1 (MCR1) and Mechanized continuous retreat 2 (MCR2) respectively. The methods involve establishing longitudinal stope ...
The longitudinal method uses two drifts (upper and lower) running along the strike through the orebody with fewer cross cuts, thus requiring less mine development. Stoping and backfilling are often practiced in longitudinal retreat; see Fig. 1c. Both transverse and longitudinal stoping methods are particularly suited for steeply dipping orebodies.
Longhole. This method consists in a variety of chambers where the mine blocks are generally cut by sub-levels from which long holes are drilled in plans that are generally parallel. These boreholes allow to blast the block by successive vertical break. The broken ore is mucked out by drawpoints or by longitudinal retreat.
underground mining method was defined during the feasibility study with limited information. With the experience from the underground mining and more rock mechanical and geological data, this thesis was conducted to study if there could be more cost effective method for mining …
Production Summary & Forecast. Delivering on Performance: Agnico Eagle has established a valuable reputation for staying true to our mission, faithfully executing our business strategy, and for delivering measured, responsible growth. In 2020, payable gold production totaled 1,736,568 ounces of gold (including 36,416 ounces of pre-commercial gold production from the IVR pit at Amaruq, the ...
• Changing mining method to longitudinal retreat mining, hence reducing development meters, simplifying the 40000 35000 30000 25000 20000 15000 800 700 600 500 400 300 (oz/month) / Cash Costs ($/month) Unit Cash Costs ($ / oz) 12
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.
operation. Narrow vein longitudinal retreating mining methods are especially susceptible to hanging wall and footwall dilution due to the wall overbreak. Understanding the factors which influence the stability of these walls can help a mining engineer design stopes that minimize dilution.
Mar 11, 2018· Selecting a Mining Method. ... Some common ones include longitudinal stoping, transverse longitudinal stoping, big-hole stoping, and vertical crater retreat. Longitudinal stoping, also referred to as bench stoping or sublevel benching is a preferred method when the orebody is thin and narrow and steeply dipping and sheet-like. Transverse ...
recovery in longitudinal sublevel caving, mainly as the knowledge base for this particular mining method is limited when compared to other bulk mining methods. The analyses involved 3,358,301 fired tonnes and 3,520,322 drawn tonnes spread over 106 "stopes" and 5 …
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.
Jun 27, 2010· The mining method is longitudinal retreat with delayed backfill on sublevels of 30 m intervals. Stope dimensions are 12m along the strike and have variable width following the vein. A two-dimensional, finite element model was developed to simulate the longitudinal mining and backfilling process while monitoring ore dilution.
Retreat mining is the removal of pillars in the underground mining technique known as room and pillar mining. In the first phase of room and pillar mining, tunnels are advanced into the coal or ore body in a rectangular pattern resembling city streets. Pillars are left between tunnels to support the weight of …
The primary mining method is longitudinal retreat stoping. Typically, four sublevels are combined to form a mining block and within each mining block a bottom-up stoping sequence will be used. The process plant produces a gold dore bar and bagged gold concentrate thgrough gravity concentration and flotation circuits, respectively.