Quick Answer: What Happens After Open Pit Mining?

What are the benefits and drawbacks of open pit mining?

Open Pit Mining Pros & ConsEfficient Operations.

One of the major benefits to open pit mining is the increase in efficiency over deep-shaft mining techniques.

Greater Safety.

Open-pit mining is much safer than shaft mining.

Loss of Ecosystem.

Pollution and Drainage..

What are 4 types of mining?

There are four main mining methods: underground, open surface (pit), placer, and in-situ mining. Underground mines are more expensive and are often used to reach deeper deposits.

What happens when a mine is exhausted?

Open-pit mines are typically enlarged until either the mineral resource is exhausted, or an increasing ratio of overburden to ore makes further mining uneconomic. When this occurs, the exhausted mines are sometimes converted to landfills for disposal of solid wastes.

What are the effects of open pit mining?

The effects of open-pit mining and mineral processing plants on the environment include land degradation, noise, dust, poisonous gases, pollution of water, etc. (Dudka and Adriano 1997).

What happens after mining?

Eventually, once the most accessible and valuable materials have been extracted, the mine is closed, and the site must be restored back to its original state. This includes covering up mine entrances, replanting grass and trees, and testing surrounding water, soil, and air for contaminants. … The Clean Water Act.

Why are men employed in open cast mine?

Males are mostly employed in open cast mines because they have more strength than females. They can work for more hours than female can.

Is open cut mining safe?

After the mineral deposits have been exposed, the area is drilled, fractured and the mineral extracted. This method has a high recovery rate when compared to the underground, as 90 percent of mineral deposits are recovered. Overall when compared to other methods, open-cut is much safer.

What are the pros and cons of mining?

Top 10 Mining Pros & Cons – Summary ListMining ProsMining ConsHigher tax income for governmentsHabitat destructionMining is crucial for technological progressBiodiversity lossMining is a mature technologyEndangerment of speciesProcesses around mining are quite efficientMining can lead to ecological imbalance6 more rows

How long does a mine last?

For a copper mine, the extraction period or lifespan is generally expected to be somewhere between 5 to 70 years. Other mines, such as diamond mines or nickel mines, have a significantly shorter duration of extraction with some 27 and 22 years, respectively.

What are the negatives of mining?

Across the world, mining contributes to erosion, sinkholes, deforestation, loss of biodiversity, significant use of water resources, dammed rivers and ponded waters, wastewater disposal issues, acid mine drainage and contamination of soil, ground and surface water, all of which can lead to health issues in local …

How does open pit mining affect the environment?

Mining is widely regarded as having adverse effects on environment of both magnitude and diversity. Some of these effects include erosion, formation of sinkhole, biodiversity loss and contamination of groundwater by chemical from the mining process in general and open-pit mining in particular.

Where are open pit mines located?

Bingham Canyon mine located south-west of Salt Lake City, Utah, US, is the deepest open pit mine in the world. The Bingham Canyon pit is more than 1.2km deep and approximately four kilometres wide. The mine, which is owned and operated by Rio Tinto Kennecott, has been in production since 1906.

How much does it cost to rehabilitate land after a mining project?

As of March 2020, the NSW Government held about $3.1 billion in security bonds for rehabilitation of exploration and mining impacts. The security deposit covers the full cost of all rehabilitation and mine closure activities required if a mining company defaults on their rehabilitation obligations.

What is mine rehabilitation and what does it involve?

Mine rehabilitation is the process of repairing the damage done by mining activities. This can sometimes involve making the site safe and stable, however global best practice strives to create a landscape that can support future uses of the land.

Why is mining bad for the community?

Mine exploration, construction, operation, and maintenance may result in land-use change, and may have associated negative impacts on environments, including deforestation, erosion, contamination and alteration of soil profiles, contamination of local streams and wetlands, and an increase in noise level, dust and …

Why do miners need ventilation?

A mine ventilation system must prevent the release of dust into the GBA, and remove air contaminated with dust from the areas where men and machinery are traveling or working. … Wherever rock is loaded and transported, both on surface and U/G, it is normally kept wet to suppress dust.

What is open pit mining used for?

Open pit mining is a technique used to extract copper ore near the earth’s surface. Open pit mining is the most widely used technique of mining copper today. It is accomplished by creating and using benches or terraces to gradually reach deeper under the earth’s surface.

How are open pit mines rehabilitated?

Mine rehabilitation Rehabilitation management is an ongoing process, often resulting in open pit mines being backfilled. After mining finishes, the mine area must undergo rehabilitation. … The open pit is then surrounded with a fence, to prevent access, and it generally eventually fills up with groundwater.