Open-pit mining is generally less expensive in terms of exploration, development, equipment and operation. Typically, when a recovery operation is developed as an open-pit mine, the valuable mineral deposit is closer to the surface. Also, because it is open-pit, the scale of economy applies, meaning that larger equipment can be used, thus lowering the per-unit cost of operation. In addition, while underground mines must leave behind some of the target minerals in order to provide support for the mine structure, open-pit mines do not.
It should be noted that while open-pit mining is generally the less expensive mining method. that will not always the case. This is due the geology. The nature of the ore body, and the depth and angle of the deposit will enter into cost considerations when choosing a mining method. It can also depend on the rehabilitation requirements as with open pit mining you are left with huge holes in the ground and with under ground/closed mining you simply have a small entry to close with mining is finished.
it is cheaper because for deep mining ,the more deeper the minerals lies, the more difficult it is to discover and the more expensive to mine
A closed skill is often more complex than an open skill.
Open pit mining is used when the materials being mined are closer to the surface. It is safer to do open pit mining than it is to do underground mining. Underground mining is only used for mining hard minerals.
The open pit mining or the underground mining are more common now.
"Show" is open, "and" is closed. O- is open, -pen is closed. "Closed" is closed.
it is open not underground (it has no roof)
It is less expensive and the operation can remove all ore with no need to leave anything for structural reasons.
It depends. Which is more corrupt? -- An open loop or a closed loop? Whichever one is more corrupt, selfish, and greedy, then that is the one that befits attorneys.
Uranium mining can be either by open pit mining or by underground mining.
well, i think that open population is OPEN and closed is Closed
open cast mining is...
One open, one closed.
a construction site?
Most diamonds are mined with an open-pit mining process. You can read more, below.
No, not anymore. There are no mines open anymore in the Netherlands. The last (located in Limburg) closed somewhere in the beginning of the 20th century.
It's a closed syllable.
Open cast mining and Underground mining.
There is one major difference between an open DNS and a closed DNS. Open DNSs allow multiple users to connect easily while closed ones do not allow more users.
Surface mining is safer and easier than subsurface mining.Surface mining does more damage to the environment than subsurface.Surface mining creates more of a mess then subsurface or open cut mining.ON TH OTHER HAND-Subsurface mining is very dangerous.Subsurface mining allows you to retreive minerals from underground.Subsurface mining requires you to go underground, where you will have very little air.
Open cut mining
Because of the risk of tunnels collapsing and pockets of natural gas exploding.
they stay closed for no more than a week.
A closed hole flute is more popular of beginning flutist.