In order to determine transition depth from open-pit to underground mining on the basis of the allowable and economically feasible overall stripping ratios, an economic-mathematical equation is first introduced. Using the achieved equation and an analytical procedure on a particular two-dimensional hypothetical tabulate deposit, an effective ...
Specifically, after the phosphate ore body is converted from open-pit mining to underground mining, the direct roof of the underground stope is destroyed in an "elliptical arch." When the internal stress value of the pressure …
Burgundy Diamond Mines (ASX: BDM), owner of the Ekati diamond mine in Canada's Northwest Territories (NWT), says it has pulled plans for underground mining at the Sable open pit following ...
CONCLUSIONS Based on the analysis performed by using numerical program FLAC 2D for underground mining operating in the area of open pit slope, for the geological and mining conditions of Quang Ninh coal basin in Vietnam, …
A set of classified integer programming models for determining an optimum transition depth (OTD) between open pit and various underground mining methods is developed and it is shown that the integrated models present solutions that …
An increasing number of Chinese mines are transitioning from open pit to underground mining, and crown pillar design has become vital, and may eventually provide additional information to the Scaled Span concept database to provide some reference to extend the applicability of the method beyond North America. The ShiRenGou iron ore mine of ...
Planning Considerations: The efficient transition from open pit mining to an underground operation requires extensive planning. For a large mining operation, planning could last as …
Crown pillars provide regional and local support by isolating the ground surface from underground mine workings. Topography above the underground mine may be a relatively flat ground surface or an open-pit structure. Depending on what lies above and design of the underground mine, the crown pillar behaviour will differ. In transitioning setups (open …
Semantic Scholar extracted view of "Rock mass response to the transition from open pit to underground cave mining" by Germán Flores. Skip to search form Skip to main content Skip to account menu. Semantic Scholar's Logo. Search 221,475,243 papers …
the concurrent open pit and underground mining scenario, the optimizer prefers extracting blocks using open pit mining. This is due to the fact that although the underground mine could access ore sooner, the mining cost differential for open …
Sublevel caving and open pit interaction at the Ernest Henry mine, Australia At the Ernest Henry mine, the open pit operated to 2011 and had its final dimensions of 1.5 km by 1.3 km at a 530 m depth. Sublevel caving production began after completion of the open pit with the planned cave footprint of a 220 m column (Fig. 5).
Abstract Underground mining under an open-pit slope results in movement and instability of rock masses. However, most rock mass movement prediction methodologies are empirical and only suitable for underground mining. In this paper, a new theoretical methodology is proposed to predict the movement and instability of rock masses caused by …
Open-Pit Mining. Open-pit mining is a process that extracts matter close to the ground. Mining often has a reputation for going underground, but this process does not go too deep, which is why it's categorized under surface mining. However, surface doesn't necessarily mean that it doesn't go deep.
Compared to underground mining methods, the open pit mining method requires removing significant amount of overburden from the pit and moving it outside the mine. The cost of extraction of the ore from open pit constitutes the bulk of the total cost of mining operations, because the access to the ore body is so ...
At the end of the open-pit mining process in large metal mines, the mining model must change from open-pit mining to underground mining, but the mutual interference between the two mining models leads to poor production safety conditions and difficulties in production convergence during the transition period. To solve these technical problems of poor …
A mining method that requires many benches and resembles a (roughly) circular pyramid, inverted in the earth, each successive bench being cut to a smaller radius because of the slope imposed by safety considerations. a. Underground Mining b. Glory Hole Mining c. Placer Mining d. Open Pit Mining
If access to a future underground mine is possible while the open pit is still operating, this can accelerate the transition to underground mining. "Early access underground, by either decline or shaft, enables …
These will be unique to the sequence of the open pit underground interaction, which can take any combination of the following forms: Scenario 1 – Open pit transitioning to underground; …
Generally, shallow deposits are mined through open-pit mining and where the deposits are extended to a substantial depth, there is a potential for a combination of open-pit and underground mining ...
Graphite is extracted using two techniques: the open-pit method and the underground method. The economic value of the ore will determine the type of mining used. Open pit mining. Open pit mining is generally used where the ore is lying close to the earth and the layer of surface material covering the ore is thin.
While both underground and open-pit mining is widely accepted mining processes, there is a greater inclination to further expand underground mining. This transition from open-pit to underground begins when open-pit …
NEW GOLD EXPANDS OPEN PIT AND UNDERGROUND MINERALIZATION AT RAINY RIVER, DEMONSTRATES STRONG SUPPORT FOR MINERAL RESOURCES GROWTH ... further extension of open pit mining has the potential to ...
The transition from open pit to underground mining: An unusual slope failure mechanism at Palabora. In Proceedings of International Symposium on Stability of SPRING 2018, Issue 24 Rock Slopes in Open Pit Mining and Civil Engineering Situations (pp. 411-420). Cape Town: SAIMM. Castro, R. (2006).
Underground mining is used when an economically viable deposit is situated sufficiently deep such that open pit mining is cost prohibitive. There exist many underground …
The pillars in Sections 20 and 25 are unstable which are mainly affected by the Faults F8 and F18. The existence of faults alters the stress distribution, failure mode and water inrush pathway. This work provides a meaningful standard for boundary pillar and stope design in a mine as it transitions from an open pit to underground.
Discover the impact of underground mining on open pit slope walls. Learn how to identify and assess potential slope instabilities for safe and sustainable mining. Gain insights from a comprehensive parametric study on sublevel open stope …
As open pit mining of a mineral deposit deepens, the cost of extraction may increase up to a threshold where transitioning to mining through underground methods is more profitable. This paper provides an approach to determine an optimal depth at which a mine should transition from open pit to underground mining, based on managing technical risk. The …
The project will transition one of the world's largest open-pit mines into an underground mine, one of the largest, most efficient, and advanced in the world. The new mine is expected to begin operations in 2019, with a 7-year ramp-up and a nominal production of …
Abstract: Due to mutual interferences between the open pit & underground mining operations during the transition period from open pit to underground mining, poor safety production and difficult production continuation occur much more frequently. Aiming at the production conditions of ore-body at the open pit bottom and hanging-wall ore-body of underground mining during …
Underground mines are challenging environments in which to deploy network systems. Connectivity and throughput demands are high, but mine layouts limit how far wireless signals can travel. Rajant's fully mobile, autonomous V2X/M2M for underground mining eliminates the struggles of a voice-only leaky feeder with multi-radio high-speed ...
A Strategic Approach to Open Pit to Underground Transitions for Mining Companies . The transition from open pit to underground mines is a large initiative, requiring comprehensive mine planning, risk assessments and defined objectives. This ensures progress is monitored and trackable from beginning to end of the project, which can often span ...
Selection of the mining method is one of the most important decisions in the design stage of mine. Open Pit (OP), underground (Ug) methods or both of them are selected depending on the geometry ...