Open-pit mining occurs on surface and is generally the cheapest way to extract ore. This is because rock doesn't have to be moved far up hill against gravity, equipment used can be larger than underground, and it …

 · Nanfen open pit iron mine, located in Nanfen district of the Liaoning province, China, is approximately 500m deep. It is one of the largest open-pit metal mines in China. Nanfen open pit mine is owned …

 · it can take the life of humans as well as animals. Wiki User. ∙ 04:42:11. This answer is:

 · A "Disseminated" deposit, such as a Copper porphyry, can not be exploited underground, just as a Lead vein (galena) can not be exploited in the open. To try to change this is to pretend to change nature. …

 · With these laws in place, it appears that open-pit mining is demonized because of the lack of compliance with the rules and concomitant enforcement by the government. Among the major concerns about open-pit mining are the change in landform, the generation of an acid mine drainage, and the deprivation of water supply.

• In open pit mining overburden is removed. • Holes are drilled 10 to 15 meters deep and filled with explosives. The rock is blasted apart. • Ore is loaded into large trucks (which may carry 90 to 250 tonnes) by huge shovels. • Quarries are open pit mines that produce building …show more content… Effect on the Environment:

 · The primary disadvantage of this method is that the overall operating costs are at maximum during the initial years of operation when the maximum repayment of capital …

 · According to research, suspended particulate matters and respirable particulate matters are pollutant products through open-pit mining. These are more harmful than the emissions from automobiles. Further, the large amount of fossil fuel burned during extraction causes the environment to pollute.

 · What is the disadvantage of open pit mining? Con: Environmental Contamination As with all forms of large-scale mineral extraction, open-pit mining can …

Open. Jan 15 2018The cost of open pit mining is generally 50% -75% lower than the cost of underground mining which is conducive to large-scale exploitation of low-grade ore The main drawbacks of open pit mining are the occupation of land the surface is destroyed the environment is contaminated Get Price

 · Advantages and disadvantages of both systems must be compared for several criteria to guarantee optimum choice. Open-pit mining operations harbour risks which can lead to operation standstill, injury to …

Conversely, streams may also be affected by decreased surface runoff where more permeable rock strata become exposed by the surface mining. Modifications of the local …

4. Disadvantages of open pit mining. However, disadvantages when compared to Underground Mining also exist: Very large amounts of waste rock are mined. This creates costs as well as environmental issues with waste rock disposal; Major disruption of surface: pit footprint, waste dumps. High visual impact, especially strip mining.

 · Environmental hazards are present during every step of the open-pit mining process. Hardrock mining exposes rock that has lain unexposed for geological eras. When crushed, these rocks expose …

 · The Witwatersrand gold mine in South Africa is an excellent example of underground mining that exploits gold from ancient rocks at depths of up to 4 km underground. What is open pit mining. On the other …

 · Floods: Exploitation of sand deposits for gold, precious stones and other elements. Disadvantages of open pit mining One of the main disadvantages of this type of mining operation is the environmental impact it causes. Since cyanide, mercury and …

 · The major advantages of underground mining over open pit mining are lessened environmental impacts, greater selectivity, and reduced exposure to weather. Much less land surface is necessary for the operation of an underground mine than for an open pit mine of the same production size. What is the advantage and disadvantage of …

 · On the other hand, certain disadvantages may outweigh the advantages and affect direct economic considerations in some instances. Thus, large open-pit operations involve heavy capital outlay for …

 · Opencast mining, also known as surface mining or strip mining, has disadvantages that include disturbance of the environment and local ecosystems, exposure of radioactive elements and contamination of freshwater sources. The use of heavy machinery and blasting techniques also create environmental pollution.

 · Rock falls pose a significant risk in both underground and open pit mines. They could be responsible for a substantial number of fatalities, and serious injuries, infrastructure damage, and financial loss, meaning …