MINERALS AND ENERGY RESOURCES
GEOGRAPHY(X)
CHAPTER 05
MINERALS-A homogeneous, naturally occurring substance with definable internal structure is
called mineral.
MINING- Economic activity of extraction of minerals
from below the earth’s surface is called Mining.
Use of
Minerals in Daily Life
·
Materials
of daily use are made of minerals like tooth Paste Contains
Silica,Limestone,Phosphate,etc.
·
They
are also needed by our body.
·
They
are basis of all economic Activities.
Mode
of occurrence of minerals:
Minerals
are Usually found in Ores. An Ore is a naturally occurring meterial having one
or more Minerals in sufficient concentration mixed with other elements.
Minerals
Generally Occur in these forms:
- In
Igneous and metamorphic rocks: The smaller occurrences are
called veins and the larger occurrences are called lodes.
They are usually formed when minerals in liquid/molten and gaseous forms
are forced upwards through cavities towards the earth’s surface. Examples:
tin, copper, zinc, lead, etc.
- In
Sedimentary rocks: In these rocks, minerals occur in beds
or layers. Coal, iron ore, gypsum, potash salt and sodium salt are
the minerals found in sedimentary rocks.
- By
decomposition of surface rocks: Decomposition of surface
rocks and removal of soluble constituents leaves a residual mass of
weathered material which contains ores. Bauxite is formed in this way.
- As
Alluvial deposits: These minerals are found in sands of
valley floors and the base of hills. These deposits are called placer
deposits. They generally contain those minerals which are not corroded by
water. Examples; gold, silver, tin, platinum, etc.
- In
Ocean water: Most
of the minerals in ocean water are too widely diffused to be of economic
importance. But common salt, magnesium and bromine are mainly derived from
ocean waters.
DISTRIBUTION OF MINERALS IN
INDIA
India is fortunate to have
fairly rich and varied Mineral Resources, but these resources are unevenly
distributed;
Ø Peninsular
Plateau: Peninsular Rocks contain Most of the reserve of Coal, Metallic
Minerals,Mica,Non Ferrous minerals and Non Metallic Minerals
Ø Gujarat
and Assam: Sedimentary rocks in Gujarat and Assam have Most of Petroleum Deposits.
Ø Rajastan: It
has Reserve of many Non Ferrous Minerals.
Ø Northern
Plains: There is very little or No economic Minerals in vast Alluvial
Plains of North India.
Most of the Minerals in
India are Nationalized and their mining is only possible only after obtaining
due permission from Government.
But in most of the tribal
areas of North East India Minerals are owned by Individuals or Communities.
In Meghalaya
There are large deposits of Coal, Iron Ore, Limestone…etc Coal Mining In Jowai
and Cherapunjee is done by family members in the form of a Long Narrow
tunnel, Known as RAT HOLE MINING.
CLASSIFICATION OF MINERALS
- Metallic
- Ferrous (containing iron): Iron ore,
manganese, nickel, cobalt, etc.
- Non-ferrous: Copper, lead, tin,
bauxite, etc.
- Precious: Gold, silver, platinum,
etc.
- Non-metallic: Mica,
salt, potash, sulphur, granite, limestone, marble, sandstone, etc.
- Energy Minerals: Coal,
petroleum and natural gas
METALLIC MINERALS.
Minerals containing
metals are called metallic minerals. Like Gold,Silver,Tungsten,etc
1 FERROUS
MINERALS
Minerals
having Iron Content Are called ferrous Minerals.India Exports fairly large amount of ferrous minerals.These
minerals provide a strong base for the development of metallurgical Industries.
IRON ORE
Iron ore is the basic
mineral and the backbone of industrial development.India is rich in good
quality iron ores. Magnetite is the finest iron ore with a very
high content of iron upto 70%. This iron ore is valuable for the electrical
industry because of its excellent magnetic properties. Hematite
ore is the most important industrial iron ore; in terms of usage. The iron
content of hematite is 50-60%.
Major
Iron Ore Belts in India
- Orissa
Jharkhand Belt: Badampahar
mines in the Mayurbhanj and Kendujhar districts of Orissa have high grade
hematite ore. Additionally, hematite iron ore is mined in Gua and Noamundi
in Singhbhum district of Jharkhand.
- Durg
Bastar Chandrapur Belt: This belt lies in
Chhattisgarh and Maharashtra. The Bailadila range of hills in the Bastar
district of Chhattisgarh have very high grade hematite ore. This hilly
range has 14 deposits of super high grade hematite ore. Iron from these
mines is exported to Japan and South Korea via Vishakapatnam port.
- Bellary
Chitradurga Chikmaglur Tumkur Belt: This belt lies in Karnataka.
The Kudremukh mines located in the Western Ghats are a 100 percent export
unit. The ore from these mines is transported as slurry through a pipeline
to a port near Mangalore.
- Maharashtra
Goa Belt: This
belt inculdes the state of Goa and Ratnagiri district of Maharashtra. The
ores in these mines are not of very high quality. They are exported
through Marmagao port.
MANGANESE
Manganese is
mainly used in the manufacturing of steel and ferro-manganese alloy. It is also
used in making bleaching powder, insecticides and paints. Nearly 10 kg of
Manganese is required to manufacture one tonne of Steel. India Ranks fifth
in the world in the production of manganese.Oddisha is the largest
Producer of Manganese Ores in India(2010).
2) NON FERROUS MINRALS
Minerals that do not contain
iron content are called non-ferrous minerals. India has only a few reserve of non
ferrous minerals. These minerals provide strong base for Metallurgical
industry, engineering industry and electrical industry. E.g Copper,Lead,Zinc,Bauxite,gold
etc.
COPPER
Copper is
mainly used in electrical cables, electronics and chemical industries. Leading
producer Khetri mines in Rajastan.The Balaghat mines in Madhya Pradesh
produce 52% of India’s copper. Rajasthan is the next leading producer with
about 48% share. Copper is also produced in the Singhbhum district of
Jharkhand.
ALUMINIUM / BAUXITE
Bauxite ore
is used for obtaining aluminium that is formed by decomposition of rocks rich
in aluminium silicates.Bauxile is a clay like substance from which alumia
extract firstly and later alumina become aluminium. Aluminium is lightweight
yet strong and hence is used in a variety of applications. Amarkantak plateau,
Maikal hills and the plateau region of Bilaspur-Katni are the main areas of
bauxite deposits. Odisha is the leading producer of bauxite in India.
Panchpatmali in Koraput district is the most important centre of bauxite
deposit in Odisha.Oddisha is the largest producer of Bauxite in India
(34.97%)
NON
METALIC MINERALS.
The basic
characteristic of non –metallic minerals is that they do not yield new products
on melting. Mica and limestone are the important non-metallic minerals.
MICA
Mica is a
mineral which is made up of a series of plates or leaves. The mica sheets can
be so thin that a thousand of them can be layered into a few centimeter thick
mica sheet. Mica has excellent di-electric strength, low power loss factor,
insulating properties and resistance to high voltage. Mica is widely used in
electric and electronic industries.
Mica
deposits are found in the northern edge of the Chota Nagpur plateau. Koderma-Gaya-Hazaribagh
belt of Jharkhand is the leading producer of mica. Ajmer in Rajasthan
and Nellore in Andhra Pradesh are the other important producers of mica.
LMESTONE
Limestone is found in association with rocks composed
of calcium carbonates or calcium
and magnesium
carbonates. It is found in sedimentary rocks of most geological
Formations.
Limestone is the basic raw material for the cement industry and
essential for smelting iron ore in the
blast furnace.
HAZARDS
OF MINING (Killer Industry)
Mining is a
hazardous industry; both for the workers and for the residents. The Miners have
to work under tough conditions where no natural light is available. There is
always a risk of collapse of mine roof, inundation with water and fire. The
areas around mines face the problem of too much dust from the mines. Slurry
from mines damages the roads and the farmland. Houses and clothes become dirty
more often than in other areas. Miners are at great risk of getting afflicted
with pulmonary disorders. Cases of respiratory tract diseases are very high in
mining areas.
CONSERVATION
OF MINERALS
It takes
millions of years for the formation of minerals. Compared to the present rate
of consumption, the replenishment rate of minerals is very slow. Hence, mineral
resources are finite and non-renewable. Due to this, it is important that we
conserve the mineral resources.
ENERGY
RESOURCES
1)
CONVENTIONAL
ENERGY RESOURCES: Firewood,
cattle dung cake, coal, petroleum, natural gas and electricity (both hydel and
thermal)
2)
NON-CONVENTIONAL
ENERGY RESOURCES: Solar,
wind, tidal, geothermal, biogas and atomic energy.
CONVENTIONAL ENERGY RESOURCES
Firewood and cattle dung cake: As per estimates, more than 70% of
energy need in rural households is met by firewood and cattle dung cake. A
decreasing forest area is making it difficult to use firewood. Dung cake can be
put to better use in the form of manure and hence its use should also be
discouraged.
COAL
India is
highly dependent on coal for meeting its commercial energy requirements.
Depending on the degree of compression during its formation, there are
varieties of coal.
- Lignite: It is
a low grade brown coal. It is soft and has high moisture content. Neyveli
in Tamil Nadu has the main reserves of lignite coal. This type of coal is
used for electricity generation.
- Peat: It has a
low carbon content and low heating capacity and high moisture content.
- Bituminous
coal: Coal
which was formed because of increased temperature and was buried very deep
is called bituminous coal. This is the most popular coal for commercial
use. High grade bituminous coal is ideal for use in metallurgy.
- Anthracite
coal: This
is the highest quality hard coal.
In India,
coal occurs in rock series of two main Geological ages. The
Gondwana coal was formed over 200 Million years ago.
The
tertiary deposits are
about 55 million years old. The major sources of Gondwana coal are
located in the Damodar valley (West Bengal-Jharkhan). In this belt; Jharia,
Raniganj and Bokaro are important coalfields. Coal deposits are also present in
the Godavari, Mahanadi, Son and Wardha valleys.
Tertiary
coal is found in the north-eastern states of Meghalaya, Assam, Arunachal
Pradesh and Nagaland.
PETROLEUM
Petroleum
After coal, the next major energy resource in India is petroleum.
Petroleum is a major source of fuel for
various uses. Petroleum also provides raw materials for various manufacturing
industries; like plastic, textiles, pharmaceuticals, etc.
Most of the
petroleum in India occurs in anticlines and fault traps in the rock formations
of the tertiary age. The oil bearing layer is a porous limestone or sandstone
through which oil may flow. The intervening non-porous layers prevent the oil
from rising or sinking. Petroleum is also found in fault traps between porous
and non-porous rocks. Gas usually occurs above the oil because it is lighter
than oil.
Mumbai
High produces about 63%
of India’s petroleum, Gujarat produces 18% and Assam 16%. Ankeleshwar
is the most important oil field in Gujarat. Assam is the oldest oil
producing state of India –(1867 First Oil Field Discovered in Assam-MAKUN).
Important oil fields of Assam are Digboi, Naharkatiya and Moran-Hugrijan.
NATURAL GAS
Natural gas
is found along with or without petroleum. It is used as fuel and also as
industrial raw material. Large reserves of natural gas have been discovered in
the Krishna-Godavari Basin. Gulf of Cambay, Mumbai High and Andaman Nicobar
islands are also important areas with large reserves of natural gas.
The 1700 km
long Hazira-Vijaipur-Jagdishpur pipeline links Mumbai High and Bassein
with the fertiliser, power and industrial complexes in western and northern
India. Natural gas is mainly used by the fertiliser and power industries.
Now-a-days, use of CNG (Compressed Natural Gas) is increasing as vehicle
fuel in the country.
ELECTRICITY
Electricity
is generated mainly by two methods; by running water which drives hydro
turbines and by burning other fuels like coal, petroleum and natural gas to
drive turbines. Bhakra Nangal, Damodar Valley Corporation, Kopili Hydel
Project, etc. are major hydroelectric producers in the country. At present,
there are over 300 thermal power stations in India.
NON-CONVENTIONAL
SOURCES OF ENERGY
NUCLEAR ENERGY
Nuclear energy is obtained by
altering the structure of atom. When the structure of an atom is altered, too
much energy is released in the form of heat. This heat is utilised to generate
electric power. Uranium and Thorium are used for generating atomic power. These
minerals are available in Jharkhand and the Aravalli ranges of Rajasthan. The
Monazite sand of Kerala is also rich in Thorium.
SOLAR ENERGY
Photovoltaic
technology is used to convert solar energy into electricity. The largest solar
plant of India is located at Madhapur near Bhuj. Solar energy holds great
promises for the future. It can help in minimizing the dependence on firewood
and animal dung cakes in rural areas. This will also help in conservation of
fossil fuels.
WIND POWER
India now ranks as a “Wind Super
Power” in the world. The wind farm cluster in Tamil Nadu (from Nagarcoil to
Madurai) is the largest cluster in India. Andhra Pradesh, Karnataka, Gujarat,
Kerala, Maharashtra and Lakshadweep are also important centres of wind power production.
BIO GAS
Bio gas can be produced from shrubs,
farm waste, and animal and human waste. Biogas is more efficient than kerosene,
dung cake and charcoal. Biogas plants can be set up at municipal, cooperative
and individual levels. The gobar gas plants provide energy and also manure.
TIDAL ENERGY
Floodgate dams are built across
inlets. The water flows into the inlet during high tide and gets trapped when
the gate is closed. Once the tide recedes, the gates are opened so that water
can flow back to the sea. The flow of water is used to run the turbine to
generate electricity. A 900 MW tidal energy power plant is set up by the
National Hydropower Corporation in the Gulf of Kuchchh.
GEO THERMAL ENERGY
We know that the inside of the earth
is very hot. At some places, this heat is released on the surface through
fissures. Groundwater in such areas becomes hot and rises up in the form of
steam. This steam is used to drive turbines. Two experimental projects have
been set up in India to harness geothermal energy. They are; the Parvati
valley near Manikarn in Himachal Pradesh and the Puga Valley in
Ladakh.
CONSERVATION OF RESOURCES
In order to conserve energy, we
must —
·
Use the public transport system more
frequently.
·
Switch off electricity whenever not
required.
·
Use power-saving devices.
·
Check the power equipment’s regularly.
·
Use non-conventional sources of energy more
frequently.