What is found in placer deposit?

What is found in placer deposit?

The main minerals and metals associated with placer deposits are gold, cassiterite (tin), platinum, diamonds, magnetite, and some gemstones. The two most important types of placers are stream (alluvial) and beach placers.

What is a beach placer?

Beach placers form on seashores where wave action and shore currents shift materials, the lighter more rapidly than the heavier, thus concentrating them. Such a current can produce a beach placer. Beach placers are a major source of ilmenite, rutile, monazite, and zircon.

What do you mean by placer deposits which minerals occur in placer deposits?

Certain minerals may occur as alluvial deposits in sands of valley floors and the base of hills. These deposits are called ‘placer deposits’ and generally contain minerals, which are not corroded by water. Gold, silver, tin and platinum are most important among such minerals.

Why are dense minerals more likely to form placer deposits than less dense minerals are?

Why are dense minerals more likely to form placer deposits than less dense minerals? Because dense minerals are heavier and drop to the stream bottom, lighter minerals are carried along in the current of the stream.

How ore minerals are found in placer mining?

placer mining, ancient method of using water to excavate, transport, concentrate, and recover heavy minerals from alluvial or placer deposits. Placer mining takes advantage of gold’s high density, which causes it to sink more rapidly from moving water than the lighter siliceous materials with which it is found.

Which mineral is found in Kudremukh mines?

iron ore is the mineral found in Kudremukh mines.

How ore minerals are found in underground mining?

In underground mining, ores are removed from deep within the earth. Miners blast tunnels into the rock to reach the ore deposits. This process can lead to accidents that trap miners underground. Along with accidents, a career in mining can also be dangerous since it can lead to health problems.

What are placer deposits give examples of minerals found in such deposits Class 10?

Minerals that form placer deposits have higher density, and are chemically resistant to weathering. They are durable and stable. Examples of some of the minerals found in the placer deposits are gold, platinum, cassiterite, magnetite, chromite, ilmenite, rutile, native copper, zircon, monazite, and various gemstones.

What minerals are found in 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.

What kind of minerals are found in placer deposits?

Placer deposit. Minerals that form placer deposits have high specific gravity, are chemically resistant to weathering, and are durable; such minerals include gold, platinum, cassiterite, magnetite, chromite, ilmenite, rutile, native copper, zircon, monazite, and various gemstones.

What kind of metals are found in sedimentary deposits?

The principal metal ores found in these deposits are sulphides of zinc, lead, copper, and iron, and oxides of iron and manganese; they yield a large proportion of the world’s production of lead and zinc. The large lead-zinc deposits recently developed at Pine Point on Lake Athabasca, are of this type.

What happens to heavy minerals in a stream?

When heavy, stable minerals are freed from their matrix by weatheringprocesses, they are slowly washed downslope into streams that quickly winnow the lighter matrix. Thus the heavy minerals become concentrated in stream, beach, and lag (residual) gravels and constituteworkable oredeposits.

Why are clay beds more concentrated than other sedimentary rocks?

Clay beds owe their concentration to the lightness and fineness of grain of the clay, allowing it to be carried farther by water than the heavier and coarser materials.