what are the different types of minning? explain
Answers
Answer:
Explanation:
1.Open cast mining
Essentially, overburden is removed, the exposed ore is recovered, and the pit is filled, progressively, by the next tranche of overburden.
The ratio of overburden to ore may be 10:1, but can vary widely.
The working footprint of an opencast mine like Macraes in Otago would typically be up to 300 ha although the total area mined over time would be much greater than that.
2.Open cut mining
A pit is dug, progressively deeper as the ore, technical considerations, consents and economics allow.
When complete, the pit is left as a lake for community use, or modified as agreed in the consent conditions. This is the method adopted at the Martha gold mine at Waihi.
The footprint of an open cut mine is similar to an open cast mine.
3.Sea bed mining
The technologies for extracting resources off the seafloor, e.g., ironsands, rock phosphate, precious and base metal sulphides, are very different to that deployed on land, with the added challenges of working at depth and often by remote control. Material has to be scooped off the seafloor and pumped via a pipe to the surface to a purpose-built vessel. Separation of ore from waste rock is carried out on board, and the waste rock is then returned to the seafloor via a pipe to minimise sediment dispersion. Any project proposal is subject to independent scrutiny that establishes the environmental impacts and remediation requirements specific to that proposal
4.Processing
In all metal mines and many coal mines there will be a processing facility to upgrade/refine the ore into a saleable product. At the Macraes mine for example, the processing plant crushes, grinds and chemically treats the ore to recover the gold. Any chemicals used are neutralised before discharge. All water (including from rainfall) in the process plant area is collected and treated, and recycled where possible. Any discharge is monitored and controlled to meet volume and quality standards required in RMA consent conditions.
5.Rehabilitation
Requirements for rehabilitation are set out in consent conditions. An opencast mine will rehabilitate land progressively as mining advances, usually returning to grazing which is typically more productive than pre-mining.
6.Bonds
Mining companies are required to put in place bonds as insurance for the regulator, in the event the company fails.
The bond amount is typically based on an engineer’s peer reviewed assessment of the cost of closure.
7.Underground Mining
An underground mine will normally have a surface footprint of 5-10 ha.
The percentage of ore recovered depends on safety considerations.
There are a multitude of underground mining techniques to extract the maximum amount of ore in a safe manner.
There are four main methods of mining: underground, surface, placer and in-situ. The type of mining method used depends on the kind of resource that is being targeted for extraction, the deposit's location below or on the Earth's surface and the capacity of each method to profitably extract the resource. Each mining method also has varying degrees of safety and impacts on the surrounding environment, both of which are concerns for legitimate mining operations.
Each of the four mining methods are explained below.
Underground Mining
Relatively costly and frequently used to get to deeper deposits, underground mining involves digging down into the earth and creating tunnels and shafts that reach the deposits of resources. Ore and other resources can then be brought up to the surface for processing, while waste rock can be removed for disposal.
There are various types of underground mining that are categorized based on the kind of shafts used, the technique of extraction and the process used to get to a deposit. For instance, drift mining involves the use of horizontal tunnels, while slope mining uses diagonal shafts to access deposits.
The type of underground mining technique used is typically based on the geology of the area, especially the amount of ground support needed to make mining safe. Surface Mining
Surface mining involves removal of plant life, soil and potentially bedrock to be able to access resource deposits. It is normally used for fairly shallow, non-precious deposits. The two foremost kinds of surface mining are open-pit mining and strip mining.
Open pit mining involves digging out rocks to form an open pit or borrow pit, from which resources are then extracted. An open pit mine generally has stepped sides to minimize the risks associated with collapse and a large ramp for mining equipment. Some kind of water management system is generally necessary to keep an active mine from turning into a lake. Open-pit mines are typically worked until either the mineral deposit is depleted, or various factors make the mine non-profitable. When this occurs, the open pit is often modified to become a landfill for solid wastes.
Strip mining is mostly used to extract shallow, "bedded" deposits, where a mineral layer is covered by a layer of soft topsoil and weathered rocks. The relatively soft top layer of earth is stripped by either a dragline or industrial shovel to uncover a deposit.
Placer Mining
Normally formed by weathering via water and/or wind action, placers are unconsolidated deposits of resources. Placer mining is generally done in riverbeds, sands or other sedimentary environments and involves sifting valuable materials from sediments. Famously, "panning for gold" can be part of the placer mining process. In placer operations, the extracted sedimentary material is rinsed and sluiced to pull out the desired minerals.
In addition to gold, gemstones, platinum, tin and other materials can be extracted via place mining. At least 50 percent the world’s titanium comes from this type of mining operation.
In-Situ Mining
Also referred to as solution mining, in-situ mining does not involve removing intact ore from beneath the earth's surface. Instead, it involves pumping chemicals underground to dissolve resource-containing ore and then pumping what is known as the "pregnant solution" back up to the surface, where it can be processed to recover minerals. This technique is mainly used in uranium mining.
This technique causes very little disturbance to the surface and does not produce large amounts of waste rock. To use this technique, the ore body must be permeable to the extraction liquids, and it must be possible to complete the process without the significant risk of contaminating nearby groundwater.
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