why are ore mines deep inside the eart

Why does gravity decrease as we go down into the Earth?

Once inside the heavier part, however, it decreases, and I think that's the effect the asker was interested in. $endgroup$ – user35033 Feb 14 '14 at 6:26 $begingroup$ user35033 That's a good point, and I should have focused more on intuition I suppose, but I did say that It is true for certain regions in the Earth, but it's untrue for others which was my way of saying that it's not Get price

Minerals, elements and the Earth's crust

2020/8/24Minerals are substances formed naturally in the Earth. They have a definite chemical composition and structure. There are over 3000 minerals known. Some are rare and precious such as gold and diamond, while others are more ordinary, such as quartz. Do Get price

How Is Iron Extracted From the Earth?

2020/3/26Iron ores in the form of hematite (ferrous oxide) and magnetite are removed from the earth through mining. The use of heavy mining equipment is necessary to dig out large pits in an area with a large deposit of iron ore; however, because iron does not occur naturally, it is necessary to use a blast furnace to separate or refine iron from the other substances in the iron ore. Get price

3 Technologies in Exploration, Mining, and Processing

2020/8/24Similarly, in surface mines the down-hole analysis of ore in blast holes could lead to more efficient materials handling by identifying ore and waste constituents. Equally important to improving the performance of materials-handling machinery will be the development of new technologies for monitoring equipment status and for specific automation needs. Get price

Geology and Earth Science News, Articles, Photos, Maps

Azurite is a deep blue mineral that people have used for thousands of years as an ore of copper, a gem material and as a blue pigment. Geologic Occurrence Azurite is a secondary mineral that usually forms when carbon-dioxide-laden waters descend into the Earth and react with subsurface copper ores. ores. Get price

Geology: What is a Mineral Deposit? — Mining Focus

An ore deposit is a mineral deposit which has high enough grades of metal that makes it economic to mine. Essentially this means that per tonne of rock containing the desired minerals, the costs of removing the minerals from the rock and separating the metal from the minerals are lower than the value of metal per tonne of rock. Get price

Underground Mining Transportation Systems

Deep mines require some form of specific transport system between the surface and the underground level. On the other hand, shallow mines generally require a direct and simple transport system. There has been considerable and continuing debate on the use Get price

History of mining: five of the oldest mines still in operation

Top 10 deep open-pit mines In 1957, the company that took over from Chilex, Anaconda Mines, discovered the Exotica deposit, which was the largest known deposit of exotic copper. Anaconda built an oxide plant, a concentrator, smelter and refinery, complete with a mining town next to the Exotica deposit, as well as a power plant in Tocopilla. Get price

The Layers Of Earth

The outer core of the Earth is similar to a very hot ball of metals, whose temperature is around 4000 o F to 9000 0 F. It is so hot that the metals inside are all in the liquid state. The outer core is located around 1800 miles under the crust and approximately 1400 miles thick. Get price

REE

2017/9/10Mines in Australia began producing rare earth oxides in 2011. In 2012 and 2013 they were supplying about 2% to 3% of world production. In 2012 the Mountain Pass Mine came back into production, and the United States produced about 4% of the world's rare earth elements in 2013. Get price

1 The Importance of Earth Surface Processes

Earth's surface is the arena for most life and all human activity, yet what lies beneath our feet is as mysterious as it is familiar. Earth scientists or not, we recognize hills, mountains, glaciers, deserts, rivers, wetlands, and shorelines. If a good deal of rain falls, floods Get price

Welcome to Sanali group

There is a purpose to be served, a design to be executed, and huge foundation to go deep inside the earth before the building finally rises. About Founder Mohammed Noorul Haq, is an entrepreneur under whose auspices, Sanali Group now has achieved its stature today. Get price

Geology and Earth Science News, Articles, Photos, Maps

Azurite is a deep blue mineral that people have used for thousands of years as an ore of copper, a gem material and as a blue pigment. Geologic Occurrence Azurite is a secondary mineral that usually forms when carbon-dioxide-laden waters descend into the Earth and react with subsurface copper ores. ores. Get price

Minerals, elements and the Earth's crust

2020/8/24Minerals are substances formed naturally in the Earth. They have a definite chemical composition and structure. There are over 3000 minerals known. Some are rare and precious such as gold and diamond, while others are more ordinary, such as quartz. Do Get price

Butte, Montana – The Richest Hill on Earth

Founded in 1879, Butte, "the Richest Hill on Earth", is located in Silver Bow County in southwest Montana. The Butte mine district is essentially within the city limits of Butte. The city of 34,000 is nearly on the Continental Divide at an elevation of 5549 feet in the Rocky Mountains flanked by the Boulder Mountains to the north and Highland Mountains to the south. Get price

The Geology of Rare Earth Elements

The estimated average concentration of the rare earth elements in the Earth's crust, which ranges from around 150 to 220 parts per million (table 1), exceeds that of many other metals that are mined on an industrial scale, such as copper (55 parts per million) and Get price

The Layers Of Earth

The outer core of the Earth is similar to a very hot ball of metals, whose temperature is around 4000 o F to 9000 0 F. It is so hot that the metals inside are all in the liquid state. The outer core is located around 1800 miles under the crust and approximately 1400 miles thick. Get price

Why are coal mines found deep inside the Earth?

The reason coal is formed deep (ambiguous) inside the earth's crust has a lot to do with the way coal is formed. Coal is formed by accumulation of vegetative material, which due to time, pressure, and heat decompose from their complex organic mole Get price

Torgiran Mines :: Zones :: EverQuest :: ZAM

TORGIRAN MINES: Deep inside Broken Skull Rock are the Torgiran Mines, where downtrodden slaves delve into the ore-rich depths of the island. The ore is moved by rail out to Dulak's Harbor, processed in the refinery, and used to create ship's fittings and primitive Get price

Earth's inner core

Discovery Earth was discovered to have a solid inner core distinct from its molten outer core in 1936, by the Danish seismologist Inge Lehmann, who deduced its presence by studying seismograms from earthquakes in New Zealand.She observed that the seismic waves reflect off the boundary of the inner core and can be detected by sensitive seismographs on the Earth's surface. Get price

Why does gravity decrease as we go down into the Earth?

Once inside the heavier part, however, it decreases, and I think that's the effect the asker was interested in. $endgroup$ – user35033 Feb 14 '14 at 6:26 $begingroup$ user35033 That's a good point, and I should have focused more on intuition I suppose, but I did say that It is true for certain regions in the Earth, but it's untrue for others which was my way of saying that it's not Get price

Welcome to Sanali group

There is a purpose to be served, a design to be executed, and huge foundation to go deep inside the earth before the building finally rises. About Founder Mohammed Noorul Haq, is an entrepreneur under whose auspices, Sanali Group now has achieved its stature today. Get price

What Are the Benefits of Mining?

Most of the hard substances we extract from mines, such as metal ores and crystals (like diamonds) are formed deep within the Earth and pushed upward by rising magma. Coal and similar organic substances were not formed deep within the Earth but rather by the Earth's surface over millions of years as plants and animals died and left their remains in the slowly acquired sedimentary layers. Get price

How Does Mining Impact the Environment?

Mine Tailings from Ore Mines Surface or open pit mining and underground mining create mine tailings that are often in the form of a mud-like or slurry substance. The tailings from digging and tunneling are soaked up by the soil and can leach into the water. Get price

What are the main methods of mining?

Surface mines are typically used for more shallow and less valuable deposits. Placer mining is used to sift out valuable metals from sediments in river channels, beach sands, or other environments. In-situ mining, which is primarily used in mining uranium, involves dissolving the mineral resource in place then processing it at the surface without moving rock from the ground. Get price

Opportunities and Challenges in Deep Mining: A Brief

2017/8/1The characteristics of the rock mass and the boundary conditions in deep mines are the primary causes of disasters in deep mining . For example, when the mining depth reaches about 1000 m, the in situ stress caused by the overburden, tectonic features, and mining activities can cause stress concentration, resulting in damage to and failure of the surrounding rock masses [4] . Get price

20.1 Metal Deposits – Physical Geology

Most mines have concentrators on site because it is relatively simple to separate ore minerals from non-ore minerals and thus significantly reduce the costs and other implications of transportation. But separation of ore minerals is only the preliminary stage of metal refinement, for most metals the second stage involves separating the actual elements within the ore minerals. Get price

Torgiran Mines :: Zones :: EverQuest :: ZAM

TORGIRAN MINES: Deep inside Broken Skull Rock are the Torgiran Mines, where downtrodden slaves delve into the ore-rich depths of the island. The ore is moved by rail out to Dulak's Harbor, processed in the refinery, and used to create ship's fittings and primitive Get price