The document discusses lead and zinc minerals found in India. It describes the world class lead-zinc ore body discovered in Zawar, Rajasthan in 1977. The important lead mineral is galena and the important zinc mineral is sphalerite. It details the properties, origins, occurrences and uses of galena and sphalerite. The Zawar deposit is a cavity filling deposit formed in dolomite rock through the solution of minerals in rock openings. Lead and zinc have many industrial uses such as in batteries, alloys, coatings and more. India is a major producer of zinc, led by the deposits in the Zawar area.
Slides related to wall rock alteration.In these slides it is described that how host rock behave when it comes in contact with the hydro thermal fluid coming from deep Earth (Mantle) and their results.
Metallogenic Epoch and Province
Metallogenetic Epochs
Metallogenetic epochs, as defined above, are specific periods characterised by formation of large number of mineral deposits. It does not mean that all the mineral deposits formed during a definite metallogenetic epochs. In India the chief metallogenetic epochs were:
1. Precambrian
2. Late Palaeozoic
3. Late Mesozoic to Early Tertiary
Information about these fluids is an invaluable aid in mineral exploration.
Conventional academic methods of analysing fluid inclusions are too slow and tedious to be of practical application in typical mineral exploration activities.
However, the academic data from numerous studies does show that CO2 is an exceptionally important indicator when exploring for most types of gold deposit.
Because the baro-acoustic decrepitation method is a rapid and reliable method to measure CO2 contents in fluids, it can be used to study a spatial array of data and it is an invaluable and practical exploration method.
Measurements of temperatures of fluid inclusions does not usually help in mineral exploration as hydrothermal minerals deposit over a wide temperature range and there is no specific temperature which is indicative of mineralisation. However, if temperatures are available on a large spatial array of samples, then temperature trends may be a useful exploration method to find the hottest part of the system, which is presumably the location of the best economic mineralisation. Baro-acoustic decrepitation is the most practical method to determine temperatures of the large numbers of samples required.
Salinities of fluid inclusions are of limited use in exploration and are difficult to measure. However, they can be used to recognise intrusion related hydrothermal systems.
Minerals are formed by changes in chemical energy in systems which contain one fluid or vapor phase. In nature, minerals are formed by crystallisation or precipitation from concentrated solutions. These solutions are called as ore-bearing fluids. Ore-bearing fluids are characterised by high concentration of certain metallic or other elements.
Fluids are the most effective agents for the transport of material in the mantle and the Earth's crust.
Slides related to wall rock alteration.In these slides it is described that how host rock behave when it comes in contact with the hydro thermal fluid coming from deep Earth (Mantle) and their results.
Metallogenic Epoch and Province
Metallogenetic Epochs
Metallogenetic epochs, as defined above, are specific periods characterised by formation of large number of mineral deposits. It does not mean that all the mineral deposits formed during a definite metallogenetic epochs. In India the chief metallogenetic epochs were:
1. Precambrian
2. Late Palaeozoic
3. Late Mesozoic to Early Tertiary
Information about these fluids is an invaluable aid in mineral exploration.
Conventional academic methods of analysing fluid inclusions are too slow and tedious to be of practical application in typical mineral exploration activities.
However, the academic data from numerous studies does show that CO2 is an exceptionally important indicator when exploring for most types of gold deposit.
Because the baro-acoustic decrepitation method is a rapid and reliable method to measure CO2 contents in fluids, it can be used to study a spatial array of data and it is an invaluable and practical exploration method.
Measurements of temperatures of fluid inclusions does not usually help in mineral exploration as hydrothermal minerals deposit over a wide temperature range and there is no specific temperature which is indicative of mineralisation. However, if temperatures are available on a large spatial array of samples, then temperature trends may be a useful exploration method to find the hottest part of the system, which is presumably the location of the best economic mineralisation. Baro-acoustic decrepitation is the most practical method to determine temperatures of the large numbers of samples required.
Salinities of fluid inclusions are of limited use in exploration and are difficult to measure. However, they can be used to recognise intrusion related hydrothermal systems.
Minerals are formed by changes in chemical energy in systems which contain one fluid or vapor phase. In nature, minerals are formed by crystallisation or precipitation from concentrated solutions. These solutions are called as ore-bearing fluids. Ore-bearing fluids are characterised by high concentration of certain metallic or other elements.
Fluids are the most effective agents for the transport of material in the mantle and the Earth's crust.
Gold is a transitional metal. In its purest form have reddish yellow color, soft, malleable, and ductile metal.
Atomic number : 79
Atomic mass : 196.9 u
Density : 19.32 g/cm3
Melting point : 1,064 °C
Boiling point : 2,700 °C
Founded in different form associated with different rock type in different tectonic setting.
Discovered from earlier time and used for multi purposes.
Formation of gold
The saying among prospectors that "gold is where you find it" suggests its occurrence is unpredictable, but there is some certain geological environments for the formation.
Because gold is very stable over a range of conditions, it is very widespread in the earth’s crust.
Gold dissolved in warm to hot salty water, the fluids are generated in huge volumes deep in the Earth’s crust as water-bearing minerals dehydrate during metamorphism.
Any gold present in the rocks being heated and squeezed is sweated out and goes into solution as complex ions.
In this form, dissolved gold, along with other elements such as silicon, iron and sulphur, migrates wherever fractures in the rocks allow the fluids to pass.
The direction is generally upwards, to cooler regions at lower pressures nearer the Earth’s surface.
Gold eventually becomes insoluble and begins to crystallize, most often enveloped by quartz.
The association of gold and quartz vein forms one of the most common types of "primary gold deposits".
India
In India, gold mineralization of economic importance is mainly restricted to Archean greenstone terranes of the Dharwar Craton (DC).
The eastern block of the DC has a high favorability for hosting major gold deposits such as Kolar, Hutti, and Ramagiri, whereas the western block hosts only a few smaller deposits such as Gadag, Ajjahanahalli, and Kempinkote.
Gold also discoverrd by GSI in the Singbhum Craton, Aravalli Craton, Bastar Craton and Southern Granulite Terrain (SGT).
India is the second-largest consumer of gold after China.
India currently holds about 558 tones of gold, representing 6.6% of its reserves, (World Gold Council, October 2016).
Kolar Gold Field, Hutti Gold Field and Ramgiri Gold Field are the most important gold fields.
Gold Demand and Use
The largest source of demand is the jewelry industry Gold’s workability, unique beauty, and universal appeal make this rare precious metal the favorite of jewelers all over the world.
Besides jewelry, gold has many applications in a variety of industries including aerospace, medicine, dentistry, and electronics for the manufacture of computers, telephones, televisions...
The third source of gold demand is governments and central banks that buy gold to increase their official reserves.
Private investors there are private investors. Depending upon market circumstances, the investment component of demand can vary substantially from year to year.
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Cbse NCERT SOCIAL SCIENCE HISTORY GEOGRAPHY ECONOMICS POLITICAL SCIENCE CLASS 10 CHAPTER classifications of minerals conventional and non conventional energy resources
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A Strategic Approach: GenAI in EducationPeter Windle
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Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
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3. Introduction
World class LEAD/ZINC ore body was discovered
in India in 1977.
Lead is a soft, malleable poor metal, It is also
counted as one of the heavy metals.
zinc is one of the most important metal for
commercial use.
Lead-Zinc deposits in India are localized
mainly in the Precambrian formations of the
Peninsular Shield and to a smaller extent in
the lesser Himalayas.
Important deposits in India: Zawar, Rampura-
Agucha in Rajasthan.
The important LEAD mineral is galena(PbS)
The important ZINC mineral is Sphalerite(ZnS)7/10/2011 3
4. LEAD
The chief ore mineral is galena, which is the
sulphide of lead. It is used in building
construction, lead-acid batteries, bullets and
shots, weights, as part of solders, fusible
alloys and as a radiation shield etc . . .
7/10/2011 4
5. ZINC
zinc is one of the most important metal for
commercial use ,
The most important ore mineral of zinc is
sphalerite.
It is used in batteries, alloys electrical
industries ,and also it is used for coating of
iron or steel to protect the metals against
corrosion etc. . .
7/10/2011 5
6. Minerology
The other LEAD minerals are
Cerussite(PbCO3)
Anglesite(PbSO4)
The other ZINC minerals are
Zincite(ZnO2)
Smithsonite(ZnCo3)
Hemimorphite(2ZnO SiO2 2H2O)
Willemite(ZnO2. SiO4)
7/10/2011 6
7. Properties of galena
Very soft metal, pliable and quite heavy
It contains 86.6% LEAD
Crystallizes in Isometric system
Melting point is low, boiling point is high
It does not rust on weathering
Cannot penetrate by different rays (X-rays,
gamma rays etc)
High electrical conductivity
Specific gravity is very high-7.5
Hardness is about 2.5
Brilliant metallic luster7/10/2011 7
8. Properties of sphalerite
Brown or black in color
It is contains 60–62% zinc
Crystallizes in isometric system
Perfect cleavage
Conchoidal fracture
Resin lustre
Hardness is about 3.5 to 4
Specific gravity is about 4
7/10/2011 8
11. Origin
Cavity filling deposits – formed from the
solution of minerals in rock openings, include
fissure vein, shear zone, fold crack or solution
cavity deposits
Eg: Zawar Lead-Zinc deposits in Rajasthan
Replacement deposits- Lead ores are formed by
this method may be of different size, shape,
such as disseminations, veins and massive
deposits
Eg: Broken hill, Australia
Syngenetic and diagenetic Lead-Zinc deposits
are also found, although scarce in nature7/10/2011 11
12. The zawar lead-zinc deposit is located from 40
km south east of the Udaipur city in Udaipur
district, Rajasthan cover area about 64 sq km.
the deposits occurs in the dolomite rock of
mochia member of Tiri series, which belongs to
Aravalli system of Precambrian in age.
The other rocks of the area are mainly phyllite,
greywacke, quartzite and rarely conglomerate.
Igneous rock is also found as intrusion of
dolerite dyke, which is having no relationship
with mineralization7/10/2011 12
Geological Aspects of Zawar
area
14. Contd…
The mineralogy of zawar ores is very simple the
main ore minerals are sphalerite, galena and pyrite,
which varying in proportion from place to place.
Other ore minerals are arsenopyrite, chalcopyrite
and argentite, which are presenting very minute
amount.
Sphalerite is present in the form of irregular
scattered grains surrounded by galena. Sphalerite is
also present as in the form of vein let in the gangue
mass and irregular pitches of sphalerite are also
present.
Galena is present as main mineral forming ground
mass, in which rounded grains of gangue minerals
are present, galena also showing characteristic
triangular pits.7/10/2011 14
15. CONTD…..
Galena is also present in vermicular form and
squeezed into the fractures of gangue
minerals.
Pyrite is another ore mineral, which is found
in abundance in the area.
Pyrite is showing perfect cubic form and
idiomorphic crystals.
In the sixties of the centenary most geologist
in India supported the idea that the zawar
deposit has to be classified as hydrothermal
deposits at the same time PODDAR(1965)and
CHAKROBORTY(1967) suggested that this
deposit is of remobilized type. Later an
BASU(1975,1976,1982 )and CHAUHAN
(1970,1984) proposed that the zawar deposit is7/10/2011 15
16. Indian occurrencesIn India most of the zinc ore occur in close
association with lead ore. These ores occur in
the Udaipur & Zawar district of Rajasthan
Zawar belt has been the oldest centre of lead-
zinc production in the world. The zawar LEAD-
ZINC belt extent for a distance of 20 kms
from Hameta Mogra to parshad.
The Rampura-agucha belt in the Bhilwara
district of Rajasthan is expected to meet the
countries need for LEAD-ZINC metal for more
than 40 years
LEAD-ZINC ores occur in the Vadodara
district of Gujarat and also seen in the7/10/2011 16
17. Occurrences in
Karnataka
Several minor occurrences are, however, known
Crystals of galena are sporadically
distributed in a of pegmatite vein set in a hard
layer of kankar at 0.5 km north of Merti,
Bellary district. Prospecting pits were located
at the contact zone of amphibolites and
intrusive granitic gneiss.
Thin veins of quartz containing patches of
argentiferous galena are seen ESE of
kurubaramardikere In Chitradurga dist.
Galena is found in small isolated pockets in
quartz vein which are neither extensive nor
persistent at depth.7/10/2011 17
18. Indications of galena are found at several
places S-E of the Belligudda hill in
Ingladhal(Chitradurga dist).
The S-W flanks of the ridge half a km NE of
Gollarahatti (Chitradurga dist). show narrow
veins and stringers of quartz vein with good
show of galena.
It is reported that veins of quartz traversing
shimoga granites carry dissemination of
galena 3.5km SE of Harnahalli in shimoga
dist
7/10/2011 18
CONTD…..
20. Conclusio
n
Lead and Zinc are very widely known important
metals.
They serve as good industrial raw materials.
It has varied application starting right from
household goods to massive industrial items.
India is the fourth largest producer of zinc, first
producer is china.
Zawar area is the largest producer in India
About 70% of the world's zinc originates from
mining, while the remaining 30% comes from
recycling secondary zinc.
Metallic lead does occur in nature, but it is rare.
Lead is usually found in ore with zinc, silver and
(most abundantly) copper, and is extracted7/10/2011 20
21. References
India’s Mineral Resources(second edition) by
S.Krishna swami, Published by Mohan Primlani,
Oxford & IBH Publishing co(1979) pp:288-
301,486-491.
Mineral Resources of Karnataka by
B.P.Radhakrishna, published by Geological
society of India, Bangalore(1996)pp:339-340.
Ore Geology and Industrial Minerals An
Introduction by Anthony M.Evans(third edition),
published by Oxford Blackwell Scientific
Publication.pp:7-21,99,197
www.google.com
www.wikipedia.com7/10/2011 21