Open Pit Mining Through Underground Workings

OPEN PIT MINING THROUGH UNDERGROUND WORKINGS

OPEN PIT MINING THROUGH UNDERGROUND WORKINGS the procedures to be followed when working or drilling within a marked area that may be underlain by underground workings; the person responsible for approving entry to a marked area should be identified; the procedures to be followed when marking out the proposed probe drilling pattern;

Open Pit Mining through Historic Underground Workings | …

26.06.2016· Newmont's Phoenix mine located in northern Nevada, USA is currently being mined as an open pit mine in the Fortitude and Bonanza Pits. A portion of the ore bodies targeted by these pits was mined previously by underground mining methods, dating back to the mid to late 1800's. Most of the underground workings (voids) are located in the west central area of the Bonanza Pit. Figure 1 …

Risk Management Strategies for Open Pit Mining Through ...

Risk Management Strategies for Open Pit Mining Through Historic Underground Workings Neil Bar a *, Peter du Plessis b , Sam Nicoll b , Senaka Welideniya c , Cameron Ryan a and Peter McAllister d

Risk Management Strategies for Open Pit Mining Through ...

Historic underground workings or voids below the working floor of an open pit and voids behind or intersected by pit slopes have the potential to collapse and induce uncontrolled ground movement...

Open Pit Mining Through Underground Workings

OPEN PIT MINING THROUGH UNDERGROUND WORKINGS 4.0 MAKING THE HAZARD VISIBLE All areas of a working bench or flitch that are likely to be underlain by underground workings must be clearly marked and access to this area must be controlled by a specific set of procedures. These procedures should specify the personnel responsible for monitoring and . Risk Management Strategies for Open Pit Mining ...

Guidance about ground control - Department of Mines ...

Open pit mining through underground workings - guideline - 529 K b. Open pit mining through underground workings - guideline: This guideline offers advice on the issues that should be addressed when open pit mines are excavated through abandoned underground workings, or in close proximity to current underground workings.

Risk Management Strategies for Open Pit Mining Through ...

29.10.2018· Underground mining in gold, base metals and coal deposits has occurred for centuries, and even millennia in some parts of the world. The mechanization of mining and economic appeal of open pit mining in the last 30 years has facilitated the conversion of many historic underground mines into large open pits. Historic underground workings or voids below the working floor of an open pit …

Method of ventilation open-pit and underground mining

Method of ventilation open-pit and underground workings, including fresh air in mining production through the main fan, characterized in that the ventilation in the career carried out by a combination of non-isothermal free jets that create career fans with electric and convective flows, which create hydrogen by the steam generators with electrolyzers, decadent career water, while the supply main and career …

Open pit mining through underground workings

Open pit mining through underground workings. MJ Series Jaw Crusher. MJ series jaw crusher is mainly used as a coarse crushing crusher. Its purpose is to crush rocks into smaller particle sizes for subsequent processing… Read More. MC Series Single-Cylinder Hydraulic Cone Crusher. MC series single cylinder hydraulic cone crusher is used in secondary and fine crushing operations. It is widely ...

Open Pit Mining Through Underground Workings

OPEN PIT MINING THROUGH UNDERGROUND WORKINGS 4.0 MAKING THE HAZARD VISIBLE All areas of a working bench or flitch that are likely to be underlain by underground workings must be clearly marked and access to this area must be controlled by a specific set of procedures. These procedures should specify the personnel responsible for monitoring and . Risk Management Strategies for Open Pit Mining ...

Risk Management Strategies for Open Pit Mining Through ...

29.10.2018· The mechanization of mining and economic appeal of open pit mining in the last 30 years has facilitated the conversion of many historic underground mines into large open pits. Historic underground workings or voids below the working floor of an open pit and voids behind or intersected by pit slopes have the potential to collapse and induce uncontrolled ground movement which may …

Stability and access implications of open pit mining ...

28.11.2016· Increasingly, mining operations are looking at developing large open pits down through old, abandoned underground workings in order to extract remnant ore left within pillar zones.Maintaining pit wall stability while mining through major scale underground stoping zones presents both a risk and challenge that can have significant impact on overall pit economics and viability.

UNDERGROUND WORKINGS DETECTION AT THE …

The mine area has been continuously worked since 1893, predominantly by underground mining methods and more recently through open cut mining. Consequently, the Fimiston Open Pit is now mining through a dense network of underground development workings with open and filled stopes of varying sizes. Figure 1 is a photo taken from the pit showing ...

Open pit mining through underground workings

Open pit mining through underground workings. MJ Series Jaw Crusher. MJ series jaw crusher is mainly used as a coarse crushing crusher. Its purpose is to crush rocks into smaller particle sizes for subsequent processing… Read More. MC Series Single-Cylinder Hydraulic Cone Crusher. MC series single cylinder hydraulic cone crusher is used in secondary and fine crushing operations. It is widely ...

OPTIMIZATION OF PRODUCTION PLANNING IN UNDERGROUND MINING

underground mining methods. In open pit optimization, lower level blocks are linked with the blocks of upper level based on the wall angles of open pit. Lerchs-Grossman algorithm (Lerchs and Grossman, 1965) and network flow (Picard, 1976) concepts are the best approaches to solve these problems. These techniques cannot be applied directly to the

5.2 Underground Workings – Hydrogeology and Mineral ...

5.2 Underground Workings. A decline tunnel, vertical shaft, horizontal drift and stopes (an open mine void where ore has been removed) act as hydraulic sinks due to the atmospheric pressure boundary condition they impose in the region below the water table. During the planning stage, insight is required to the anticipated flow of groundwater ...

Sinkhole demonstrates dangers around old workings ...

Ensure all underground workings relevant to the proximity of active open pit work areas are marked on all working plans and void management processes are in place and applied. Adopt rigorous change management processes in critical decisions regarding operational practices, especially around voids (e.g. conduct rigorous site investigations to support any change in management strategies).

Crown pillars - QueensMineDesignWiki

Crown pillars between open-pit and underground mining are required to prevent water from entering from the bottom of the open pit into the underground stope . In some cases, the open pit may be mined simultaneously with the underground operations. If this occurs, careful consideration must occur on the required crown pillar thickness, as the pillar will be reduced in thickness as mining ...

Mine Closure and Reclamation - Practical Examples of ...

underground and open pit mining, with modern open pit mining commencing in 1985 and lasting until 1991. Before reclamation, the site consisted of the usual features of historic pits filled with tailings, open pits, waste dumps, heap leach pads and other associated mine facilities. Issues that had to be

Open Pit Mining Through Underground Workings

OPEN PIT MINING THROUGH UNDERGROUND WORKINGS 4.0 MAKING THE HAZARD VISIBLE All areas of a working bench or flitch that are likely to be underlain by underground workings must be clearly marked and access to this area must be controlled by a specific set of procedures. These procedures should specify the personnel responsible for monitoring and . Risk Management Strategies for Open Pit Mining ...

UNDERGROUND WORKINGS DETECTION AT THE …

The mine area has been continuously worked since 1893, predominantly by underground mining methods and more recently through open cut mining. Consequently, the Fimiston Open Pit is now mining through a dense network of underground development workings with open and filled stopes of varying sizes. Figure 1 is a photo taken from the pit showing ...

Open Pit Mining Through Underground Workings

OPEN PIT MINING THROUGH UNDERGROUND WORKINGS,OPEN PIT MINING THROUGH UNDERGROUND WORKINGS 1.0 INTRODUCTION A number of open pit mines in Western Australia (WA) are ... Read more. open pits through underground. Mining Through Underground Workings in Fimiston Open Pit ... The pit area has been continuously worked since 1893, predominantly by underground mining …

OPTIMIZATION OF PRODUCTION PLANNING IN UNDERGROUND MINING

underground mining methods. In open pit optimization, lower level blocks are linked with the blocks of upper level based on the wall angles of open pit. Lerchs-Grossman algorithm (Lerchs and Grossman, 1965) and network flow (Picard, 1976) concepts are the best approaches to solve these problems. These techniques cannot be applied directly to the

5.2 Underground Workings – Hydrogeology and Mineral ...

5.2 Underground Workings. A decline tunnel, vertical shaft, horizontal drift and stopes (an open mine void where ore has been removed) act as hydraulic sinks due to the atmospheric pressure boundary condition they impose in the region below the water table. During the planning stage, insight is required to the anticipated flow of groundwater ...

Sinkhole demonstrates dangers around old workings ...

Ensure all underground workings relevant to the proximity of active open pit work areas are marked on all working plans and void management processes are in place and applied. Adopt rigorous change management processes in critical decisions regarding operational practices, especially around voids (e.g. conduct rigorous site investigations to support any change in management strategies).

Maps of the Underground Workings, Monument No.2 Mine ...

underground workings were later destroyed by open-pit mining at the property. LOCATION The Monument No. 2 mine is located on the Navajo Indian Reservation in the extreme northwestern corner of Apache County, Arizona. The mine is in Cane Valley on the …

Geochemistry of Flooded Underground Mine Workings ...

much more extensive underground workings of the East Camp (Fig. 1). East Camp groundwater drains into the Berkeley Pit, an abandoned open-pit copper mine, which now contains over 100 billion l of highly acidic (pH 2.5) and metal-rich water. Whereas the Fig. 1 Map of abandoned underground mines in Butte, color-coded for depth below the Alice ...

Mine Closure and Reclamation - Practical Examples of ...

underground and open pit mining, with modern open pit mining commencing in 1985 and lasting until 1991. Before reclamation, the site consisted of the usual features of historic pits filled with tailings, open pits, waste dumps, heap leach pads and other associated mine facilities. Issues that had to be

Simulating Underground Mine Inflows and Dewatering with ...

Drain cells represent the effects of TQR and N-Zone underground mine workings, including drifts, ramps, and stopes, and the Getchell Pit. The pit drains were used to approximate effects of early dewatering wells, which have a poorly-documented history. Later pit …