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7.1 Mineral Resources
Transcript of 7.1 Mineral Resources
Ore - a natural material whose concentration of valuable mineral is high enough to be mined for profit.
Can be formed in three ways:
Uses of Mineral Resources
Some metals are valued for their beauty.
Mineral Exploration and Mining
An area is considered for mining if it has at least 100 - 1,000 times the concentration of minerals that are found elsewhere.
Mineral resources can include metals or nonmetals.
Ores Formed by Cooling Magma
As magma cools, dense metallic minerals sink.
These minerals collect at the bottom of the magma chamber.
Ores Formed by Contact Metamorphism
When magma comes in contact with existing rock, it alters that rock's composition.
Deposits can also form
when hot fluids move
through small cracks in
Veins are formed when dissolved minerals collect in narrow zones.
Thick veins in a small region are called lodes.
Ores Formed by Moving Water
Tiny fragments of the native element are eroded from the rock.
Fragments are carried downstream until dense metals settle.
Placer Deposits - contains a valuable minerals that has been concentrated by mechanical action.
Gemstones - nonmetallic minerals that can be cut and polished for jewelry or decoration.
Other nonmetallic minerals such as gypsum can be used as building material.
Four Main Types of Mining
Minerals are mined by miners who work underground to recover the deposits.
Overlying rock material above the shallow deposits is stripped away to reveal the mineral.
Dredging - workers use large buckets attached to a floating barge.
They scoop up sediment at the front of the ship, sift out the minerals, and deposit the sediment back.
Nodules - lumps of minerals on the deep-ocean floor.
Contain iron, magnesium, and nickel.
Minerals on the ocean floor are very difficult and expensive to mine.