What are the steps of underground mining?
It involves drilling a section of ore at the very bottom of the deposit and then blasting to make the roof collapse. Gravity then takes over, as the ore above the blast site fractures and collapses in succession as support is withdrawn. The collapsed ore is hauled out the mine for processing [source: Great Mining].
How do you choose a method of underground metal mining?
- 1) Longwall mining. 2) Room-and-pillar mining.
- 3) Blast mining. 4) Shortwall mining.
- 5) Coal Skimming. Mining can be done by the following methods:
What are the types of underground mining?
Underground methods are traditionally broken into three classes: unsupported, supported, and caving methods. These classes reflect the competency of the orebody and host rock more than anything else.
What is deep underground mining?
Underground hard-rock mining refers to various underground mining techniques used to excavate “hard” minerals, usually those containing metals, such as ore containing gold, silver, iron, copper, zinc, nickel, tin, and lead. It also involves the same techniques used to excavate ores of gems, such as diamonds and rubies.
How does underground mining work?
Underground mining is used when the copper ore is not near the earth’s surface. Miners dig a shaft into the ore deposit vertically or a horizontal tunnel (or adit) in order to do this. Mining then follows the vein of ore and the underground mine develops.
What are types of underground mining?
There are two principal phases of underground mining: development mining and production mining. Development mining is composed of excavation almost entirely in (non-valuable) waste rock in order to gain access to the orebody.
What is underground mining used for?
What are advantages of underground mining?
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.