why are open pit mines used instead of underground mines

Get prices Online Chat
  • Open Pit Mining Techniques|Surface Mines|Rock or Mineral

    Open-pit Mining Open-pit mining, also known as opencast mining, open-cut mining, and strip mining, means a process of digging out rock or minerals from the earth by their elimination from an open pit or borrow The word is used to distinguish this type of mining from.

    【Get Price】
  • Mining - Underground mining | Britannica

    In open-pit mines this consists of building access roads and stripping the overlying waste material in order to expose the ore and establish the initial bench geometri For an underground mine the development stage is considerably more complicated Some of the development components of an underground mine are illustrated in the figure.

    【Get Price】
  • Flooded mines - Wikipedia

    The time it takes for a mine to get flooded depends on factors such as quantity of open space in the mine, availability of infiltration water and on the nature of flooding - it can be uncontrolled, controlled or monitored Open pit min Flooding in open pit mines leads to the so-called pit lakes, where a wide range of creatures can be seen.

    【Get Price】
  • why are open pit mines used instead of underground mines

    why are open pit mines used instead of underground min Chile’s huge open-pit copper mine goes underground , so state-owned mining company Codelco is trying to , why are open pit mines used instead ofThe consequence is that instead of , mining industry, and has worked on open pit and underground metalliferous mining problems.

    【Get Price】
  • Lessons From the Most Toxic Open Pit Copper Mine in the World

    Nov 28, 2016· Except for canaries, underground mines have never been a threat to birds, and underground mines were the norm until the 1950s when open pit mining began in Montana The Berkeley Pit was the first open pit mine in the area and today it is the most toxic open pit copper mine in the world And it is lethal to water birds.

    【Get Price】
  • Mining Flashcards | Quizlet

    Surface Mining (Strip, Open Pit, Mountain top Removal) is used when coal is near the surface Soil and rock overlying the deposit are removed to retrieve the deposit Deep mining (underground) drills tunnels into the earth for extraction.

    【Get Price】
  • What are the differences between open pit mining

    Apr 07, 2017· Strip mining and subsurface mining Strip mining (or surface mining) is performed when surface soil and rock are stripped off to reach the mineral of concern When such operations are done, surface water bodies (lakes, streams, etc) gets acidity Acid mine drainage occurs when water molecules infiltrates the spoil banks The water reacts with sulfide minerals to produce sulfuric ac.

    【Get Price】
  • Open-pit mining – General Overview - Protect Ecuador

    Because open-pit mining is employed for ore deposits at a substantial depth underground, it usually involves the creation of a pit that extends below the groundwater table In this case, groundwater must be pumped out of the pit to allow mining to take place.

    【Get Price】
  • Open Cut or Underground Mining - Which is better? - Bend

    Oct 21, 2017· Open Cut or Underground Mining – Which is better? October 21, , Both open-cut and underground mining is used in modern mining The approaches are different, and there are advantages to each Open-cut mining Open-cut gets its name because that’s exactly what this type of mining looks like, a big open pit This type of mining allows for.

    【Get Price】
  • why are open pit mines used instead of underground mines

    why are open pit mines used instead of underground min Open pit mines can be used in coal mining, and they are used extensively in "hard rock" mining for ores such as metal ores, copper, gold, iron, aluminum, and many minerals.

    【Get Price】
  • Underground versus Open Pit Mining - Firwin Corp's Blog

    There are several different ways to mine underground You can build spiral tunnels that circle the deposit, sink vertical shafts adjacent to the ore, or create adits, which are horizontal excavations into the side of a hill or mountain Unlike open pit, underground mining requires that you take into account a wide variety of added requirements.

    【Get Price】
  • What are the differences between open pit mining

    Apr 07, 2017· Strip mining and subsurface mining Strip mining (or surface mining) is performed when surface soil and rock are stripped off to reach the mineral of concern When such operations are done, surface water bodies (lakes, streams, etc) gets acidity Acid mine drainage occurs when water molecules infiltrates the spoil banks The water reacts with sulfide minerals to produce sulfuric ac.

    【Get Price】
  • Government to reduce mineral royalty tax for underground

    Government has agreed to reduce mineral royalty tax for underground mines to 6 percent from a proposed 9 percent in a bill to be presented to parliament for approval later this month.

    【Get Price】
  • What is Underground Mining? (with pictures) - wisegeek

    Jul 07, 2019· Underground mining is a technique used to access ores and valuable minerals in the ground by digging into the ground to extract them This is in contrast with techniques like open pit mining, in which the surface layers of ground are scooped away to access deposits, or mountaintop removal, in which the top of a mountain is simply shaved off to access the ore inside.

    【Get Price】
  • Open Cut or Underground Mining - Which is better? - Bend

    Oct 21, 2017· Open Cut or Underground Mining – Which is better? October 21, , Both open-cut and underground mining is used in modern mining The approaches are different, and there are advantages to each Open-cut mining Open-cut gets its name because that’s exactly what this type of mining looks like, a big open pit This type of mining allows for.

    【Get Price】
  • Types of Australian mine: Open Pit or Underground Mine

    Although both methods have their benefits and drawbacks, underground drilling may just be the cost worthy selection for you Mining for coal depends on many variabl The geology and environmental aspects play a vital role, but depth and quality of the seam is what brings home the bacon Depending on where the seam (profitable bed of coal) is located, extracting this black gold can require a.

    【Get Price】
  • Open Pit Mine Design, Planning & Engineering | Mining

    Fernando specializes in mine plan optimization for surface, underground and open pit min He has a great deal of experience with open pit mines serving on several due diligence teams responsible for all aspects of mining, costing, mine planning and geotechinical work.

    【Get Price】
  • Why underground mines cost higher , - Market Realist

    Underground mining is more expensive because it's more capital intensive Coal companies have to drill more, and use more expensive and complicated machin , Why underground mines.

    【Get Price】
  • The Mining Life: Open Pit vs Underground - MICROMINE

    Aug 22, 2017· The differences between the many kinds of mines, especially open pit mines and underground mines, are many, and miners tend to prefer one over the other Every mining site has its natural and man-made characteristics that make it unique.

    【Get Price】
  • Open Pit Mining - Mining Artifacts

    Open Pit Mining Open-pit mining, also known as opencast mining and open-cut mining, refers to a method of extracting rock or minerals from the earth by their removal from an open pit or barrow The term is used to differentiate this form of mining from extractive methods that require tunneling into the.

    【Get Price】
  • The many advantages of underground mining - born2invest

    Apr 27, 2015· Enhancing its opencast operations with an underground mining could potentially increase the Kun-Manie mine site by at least 19 percent Choosing between open-pit mining and underground mining is a decision that every mining company makes, but it is not based on the miner’s whim and predilection.

    【Get Price】