Table of Contents
- 1 What type of mine often has a network of tunnels that extend deep into the ground following the veins of ore?
- 2 How are mining ores surface and underground?
- 3 What type of mining is used for ore that is close to the surface and covers a large area?
- 4 What do miners use to go underground?
- 5 What are the pros and cons of underground mining?
- 6 Where does the deep biosphere begin and end?
- 7 How are minerals formed in the natural world?
What type of mine often has a network of tunnels that extend deep into the ground following the veins of ore?
shaft mines- For ore deposits that occur in veins, miners dig shaft mines. Shaft mines often have a network of tunnels that start at the surface and extend deep into the ground, following the veins of ores.
How are mining ores surface and underground?
Underground mining is used to recover ores that are deeper into Earth’s surface. Miners blast and tunnel into rock to gain access to the ores. An underground ore deposit can be approached from above, below, or sideways. Fresh air and lights must also be brought into the tunnels for the miners.
What type of mining is used for ore that is close to the surface and covers a large area?
Open-pit mining is the most common method used throughout the world for mineral mining and does not require extractive methods or tunnels. This surface mining technique is used when mineral or ore deposits are found relatively close to the surface of the earth.
What are the 4 main methods 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.
- Surface mines are typically used for more shallow and less valuable deposits.
What type of minerals are those that are economical and valuable to extract?
Minerals that are of economic value can be classified as metallic or nonmetallic. Metallic minerals are those from which valuable metals (e.g. iron, copper) can be extracted for commercial use.
What do miners use to go underground?
The underground mining methods we use include room and pillar, narrow vein stoping and large-scale mechanised mining. Room and pillar mining is a style of mining where tunnels are driven in a chess board pattern with massive square pillars between them which are gradually cut away as the work proceeds.
What are the pros and cons of underground mining?
So, in these cases underground mining is more cost effective. The downside is that human health and safety are at greater risk from mine cave-ins, flooding from groundwater or sea water, methane explosions in coal mines, or failure of air ventilation equipment.
Where does the deep biosphere begin and end?
The deep biosphere is the part of the biosphere that resides below the first few meters of the surface. It extends down at least 5 kilometers below the continental surface and 10.5 kilometers below the sea surface, at temperatures that may reach beyond 100°C.
What is the definition of the deep subsurface?
For the seafloor, an operational definition of deep subsurface is the region that is not bioturbated by animals; this is generally about a meter or more below the surface. On continents, it is below a few meters, not including soils.
What kind of organisms live in the deep subsurface?
Viruses are also present and infect the microbes. The deep biosphere is an ecosystem of organisms and their living space in the deep subsurface. For the seafloor, an operational definition of deep subsurface is the region that is not bioturbated by animals; this is generally about a meter or more below the surface.
How are minerals formed in the natural world?
Identifying Minerals Color, streak, luster, density, hardness, crystal systems, cleavage and fracture, and special properties Because minerals are formed by processes that occur in the natural world, they are said to be ___________. Naturally occurring