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.
What is mining?; Why do we need mines?; What is a mineral ?; What is an Ore Deposit? ; Concentrations of Metals; Metals enrichment factors ; Types of Ore Deposit ; GEOLOGIC CONDITIONS AND CHARACTERISTIC OF ORE DEPOSITS; Shape of ore deposits; Dip ore deposits ;Thickness ore deposits; Depth of ore deposits; Structure of ore deposits; Ore value and profitability of mining; Stability of ore rocks; Chemical and mineral characteristics of ores ; Lessening of ore deposit; Degree of breakability; Life Cycle of a Metal Resource; Mineral Supply and Demand; Conservation; Economic Impact on Mineral Supplies
What is mining?; Why do we need mines?; What is a mineral ?; What is an Ore Deposit? ; Concentrations of Metals; Metals enrichment factors ; Types of Ore Deposit ; GEOLOGIC CONDITIONS AND CHARACTERISTIC OF ORE DEPOSITS; Shape of ore deposits; Dip ore deposits ;Thickness ore deposits; Depth of ore deposits; Structure of ore deposits; Ore value and profitability of mining; Stability of ore rocks; Chemical and mineral characteristics of ores ; Lessening of ore deposit; Degree of breakability; Life Cycle of a Metal Resource; Mineral Supply and Demand; Conservation; Economic Impact on Mineral Supplies
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.
How can minerals deposits be formed; GEOLOGICAL PROCESSES; Ore Fluids; Ore Forming Processes; Concentrating Processes; Magmatic mineral deposits; Residual mineral deposits ; Placer deposits; Sedimentary mineral deposits; Metamorhogenic mineral deposits; Hydrothermal mineral deposits ; Magmatic Deposits
Cumulate deposits: fractional crystallization processes can concentrate metals (Cr, Fe, PGE, Pt, Ni, Ti, Diamond ))
Pegmatites : late staged crystallization forms pegmatites and many residual elements are concentrated (Li, Ce, Be, Sn, U, Rare Earths (REE), Feldspar, Mica, Gems).
magmatic deposits; Mode of Formation of Magmatic Ores Deposits; Mode of Formation of Orthomagmatic Ores ; Fractional Crystallization (or Crystal fractionation ); Magmatic (or Liquid ) Immiscibility; Simple crystallization without concentration (Dissemination); Segregation of early formed crystals; (Layer Types); Injection of material concentrated elsewhere by differentiation Residual liquid segregation; Residual liquid injection; Immiscible liquid segregation; Immiscible-liquid-injection; Early magmatic deposit; Late magmatic deposit; Types of Magmatic Ore Deposits:Chromite; Fe-Ti (± V) oxides; Ni – Cu – Fe (± Pt) sulfides; Platinum Group Elements (PGEs); REE, and Zr in Carbonatites; Diamond in kimberlites.
To review the geology of rare earth elements.
To discuss the various applications of rare earth elements in geological studies.
To review the geology of rare earth elements.
To discuss the various applications of rare earth elements in geological studies.
Abundance of REEs in Earth’s Crust ; Classification of Rare Earth Elements; Geology of REEs; APPLICATIONS OF REES; Application OF REEs in Geological Studies; APPLICATION OF REE TO PETROLEUM SYSTEMS; REE GLOBAL ECONOMIC SUPPLY AND DEMAND; Large and Giant Sized Deposits of the Rare Earth Elements
A List Of Precious And Semi Precious Gemstones9gemeu
There are so many types of gemstones available today. We have created a comprehensive list of gemstones to guide you and help to find the perfect gemstone. others to be semi-precious, more are considered fine or ornamental. Differences apply. What stones are considered precious and which are those considered semi precious
It is one of my finest works . A detailed packet of information of minerals with their types, how they are formed, mining processes and protection from mining hazards.
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.
How can minerals deposits be formed; GEOLOGICAL PROCESSES; Ore Fluids; Ore Forming Processes; Concentrating Processes; Magmatic mineral deposits; Residual mineral deposits ; Placer deposits; Sedimentary mineral deposits; Metamorhogenic mineral deposits; Hydrothermal mineral deposits ; Magmatic Deposits
Cumulate deposits: fractional crystallization processes can concentrate metals (Cr, Fe, PGE, Pt, Ni, Ti, Diamond ))
Pegmatites : late staged crystallization forms pegmatites and many residual elements are concentrated (Li, Ce, Be, Sn, U, Rare Earths (REE), Feldspar, Mica, Gems).
magmatic deposits; Mode of Formation of Magmatic Ores Deposits; Mode of Formation of Orthomagmatic Ores ; Fractional Crystallization (or Crystal fractionation ); Magmatic (or Liquid ) Immiscibility; Simple crystallization without concentration (Dissemination); Segregation of early formed crystals; (Layer Types); Injection of material concentrated elsewhere by differentiation Residual liquid segregation; Residual liquid injection; Immiscible liquid segregation; Immiscible-liquid-injection; Early magmatic deposit; Late magmatic deposit; Types of Magmatic Ore Deposits:Chromite; Fe-Ti (± V) oxides; Ni – Cu – Fe (± Pt) sulfides; Platinum Group Elements (PGEs); REE, and Zr in Carbonatites; Diamond in kimberlites.
To review the geology of rare earth elements.
To discuss the various applications of rare earth elements in geological studies.
To review the geology of rare earth elements.
To discuss the various applications of rare earth elements in geological studies.
Abundance of REEs in Earth’s Crust ; Classification of Rare Earth Elements; Geology of REEs; APPLICATIONS OF REES; Application OF REEs in Geological Studies; APPLICATION OF REE TO PETROLEUM SYSTEMS; REE GLOBAL ECONOMIC SUPPLY AND DEMAND; Large and Giant Sized Deposits of the Rare Earth Elements
A List Of Precious And Semi Precious Gemstones9gemeu
There are so many types of gemstones available today. We have created a comprehensive list of gemstones to guide you and help to find the perfect gemstone. others to be semi-precious, more are considered fine or ornamental. Differences apply. What stones are considered precious and which are those considered semi precious
It is one of my finest works . A detailed packet of information of minerals with their types, how they are formed, mining processes and protection from mining hazards.
Geology and Mineral Investment Opportunities in South SudanMining On Top
Geology and Mineral Investment Opportunities in South Sudan
Hosted by Dr Andu Ezbon Adde, Under Secretary Mining,
South Sudan
Mining On Top: Africa - London Summit
25-26 Jun 2013 | London
A Petrographical Approach to Study Mineral Phases Paragenesis of Gold Bearing...Premier Publishers
India hosts several world class gold prospects like Kolar Gold Fields (KGF), Hutti Gold Fields (HGF) and Gadag Gold Fields (GGF). Karnataka is the prime state for gold production since all of these gold deposits are located within. Apart from these world class gold deposits, several other gold prospects in India were identified and exploration activities are under progress. The present study aims to characterize the mineral assemblage and paragenetic phases of gold bearing Precambrian rocks around Hosur village in Gadag Schist Belt through detailed examination by Ore Microscopy. Gadag Schist Belt (GSB) is known by its significance of gold deposits for centuries. Gold mineralization in GSB is associated with tholeiitic meta-andesite, quartz porphyries and argillite greywacke assemblage. The Gadag Gold Field (GGF) constitutes one of the most important auriferous zones of the Archaean Greenstone terrains in Southern India. All known mineralization is in the form of structurally controlled vein systems. The occurrence of the gold is intimately associated with arsenopyrite. Representative samples were studied under polarizing reflected-light microscope to identify and to characterize the mineral phases of gold occurrences and its textural relationships. It has been observed that there are five phases of mineralization only in the third phase gold has formed along with arsenopyrite. Surface morphology of gold and sulphide mineralization was examined under SEM; whereas the elemental analysis of selected sample was carried out using EDS.The present work reveals the clear perception of gold occurrence and mineral phases paragenesis using ore microscopic approach.
i hope dis helps you guys to make ur ppt's
basically I am just giving you all ideas, you can be as creative as you want when you make them.
if any comments or suggestions please let me know
thank you
Gold: The Most Precious of Metals - FocusEconomicsArne Pohlman
In this presention we discuss why gold is so unique by explaining how it is mined and processed and discuss how its unique physical properties make it one of the most useful metals. Finally, we end the post with a section on gold's importance to the global economy, the factors that set it apart from all other commodities, and how it can be classed as both a commodity and a monetary asset. Read the original blog post here: http://goo.gl/p2dFUs
Mineral Resources
1. Use and over exploitation
2. Minerals and their ores extraction
3. Mine Safety
4. Case Study
5. Environmental Problems
The environmental damage caused by mining activities are as follows:
1. Devegetation and defacing of landscape
2. Subsidence of land
3. Groundwater contamination
4. Surface water pollution
5. Air pollution
6. Occupational health hazard
A magnetic survey is a geophysical exploration method used to detect and map variations in the Earth's magnetic field caused by the magnetic properties of subsurface materials. This technique is widely applied in mineral exploration, petroleum exploration, and archaeological studies. Here's a general overview with case study and problems to be solved.
The continental crust covers nearly a third of the Earth’s surface, extends vertically from the Earth’s surface to the Moho discontinuity.
It is less dense than oceanic crust.
Compositionally is dominating by silicate elements
Models for the differentiation of the continental crust shows when and how it was formed
Reconciling the sedimentary and igneous records indicates that it may take up to one billion years for a new crust to dominate the sedimentary record.
The continental crust of the Earth differs from the crust of other planets in the Solar System
Its formation modified the composition of the mantle and the atmosphere
It supports life
And it remains a sink for CO2
Evaluating the composition of new continental crust can provide important clues as to how and when it may have been generated. Which is required understanding the differentiation processes of igneous (granites) and sedimentary rocks
Climate like any other physical phenomena it is dynamic and not static.
In every part of the world one year, one decade or one century is different than the other.
The change does not only have academic important but its effects in all the forms of life.
Plants, animals, human beings change with changes of climate.
In general, all living species thrive under definite and limit conditions and any great deviation from that will leads to destruction and death of the species.
Ecology: Scientific study of interactions between organisms and their environments which includes Biotic Factors: (Living organisms) , Abiotic Factors: (Nonliving physical and chemical conditions of an environment).
What are the levels of the Ecology?
Ecology has Five Levels.
Individual organism: Single organism in an environment
Populations: Group of individual organisms of same species living in the same area
Communities: All of the organisms that inhabit a particular area make up a community, like coral reef and other organisms live around in the reef
Ecosystems: An ecosystem includes both the biotic and abiotic factors of an area
Biosphere:
Sum of all of Earth's ecosystems, it is an envelope of air, land, and water supporting all living things on Earth. It consists of both the atmosphere and ocean.
Ecologists investigate global issues in the biosphere, including climate change and its effect on living things
The effects have been most dramatic at high latitudes, where multiple processes contribute to decreased surface reflectivity
Changes in temperature are causing species to shift their natural ranges; however, those are unable to move in line with changing temperatures are being put at risk.
Oceans are a vast body of salt water that covers almost three to fourths of the earth's surface.
Seas are smaller, found on the margins of the ocean and are partially enclosed by land.
Seawater:
High density, high heat capacity, colder, salty and slightly compressible (its volume decreases under pressure), thus its density increases with pressure.
Why is Ocean Circulation Important?
•Similar to winds in the atmosphere, they transfer significant amounts of heat from equatorial areas to the poles and thus play important roles in determining the climates of coastal regions.
•The ocean circulation pattern exchanges water of varying characteristics, such as temperature and salinity
•ocean currents and atmospheric circulation influence one another.
•in addition, they transport nutrients and organisms
Microfossils are very small remains of organisms 0.001 mm (1 micron) to 1 mm, that require magnification for study.
They are abundant, can be recovered from small samples.
Provide the main evidence for organic evolution through the time
They classified into two groups:
Organic-walled; Acritarchs, Dinoflagellate, Spores and Pollen grains … etc.
Foraminifera Each chamber interconnected by an opening (foramen) or several openings (foramina).
Known from Early Cambrian through to recent times, and has reached its acme during the Cenozoic.
Have a wide environmental range from terrestrial to deep sea and from polar to the tropical region.
Depending on the species, the shell may be made of organic compounds, sand grains and other particles cemented together, or from crystalline calcite.
Inorganic walled; Diatoms, Silicoflagellates, Ostracods, Conodonts, and Foraminifera
Structural geology is the study of the three-dimensional of the rock units with respect to their deformational histories, Structure is spatial and geometrical configuration of rock components.
Structures are classified into two types:
Primary structures.
Secondary structures
Primary structures
Structures that form during deposition or crystallization of the rock, are the result of two processes:
Settling of solid particles from fluid medium in which they have been suspended, in most of the sedimentary rocks.
Crystallization of mineral grains from a liquid in which they have been dissolved as in igneous rocks.
Evaporation is a process by which water changed from the liquid or solid state into the gaseous state through the absorption of heat
It is always related to the loss of water from a free surface over a fixed time interval. Either direct observation or calculation based on the factors involved in the transfer of thermal energy.
One of the fundamental component of hydrological cycle
Essential requirements in the process are
The source of energy to vaporize the liquid water (solar or wind)
The presence of gradient of concentration between the evaporating surface and the surrounding air.
The Earth is an unusual planet by having bimodal topography that reflects the two distinct types of crust.
Crust is outer part of the Earth and compositionally is consist tow types, continental and oceanic crust.
The oceanic crust is thin (~ 7 km ), and composed from denser rocks such as basalt , younger.
Whereas the continental crust is thick (~ 40 Km), and composed of highly diverse lithologies, and contains the oldest rocks.
Introduction
Stratigraphy is the study of strata (sedimentary layers) in the Earth's crust, it is the relationship between rocks and time.
Stratigrapher are concerned with the observation, description and interpretation of direct and tangible evidence in rocks to determine the history of the Earth.
The combination of sedimentology and stratigraphy allows us to build up pictures of the Earth’s surface at different times in different places and relate them to each other through the relative ages of rocks
A more modern way of stating the same principle is that the laws of nature (laws of chemistry and physics) that have operated in the same way since the beginning of time.
And thus if we understand the physical and chemical principles by which nature operates, we can assume that nature operated the same way in the past.
Basic principles of stratigraphy
Principle of Uniformitarianism
Principle of Lateral Horizontality
Principle of Superposition
Principle of Cross-cutting Relations
Principle of Inclusions
Principle of Chilled Margins
Correlation
The southern Indian granulite terrane is known for granulite - facies rocks which is formed during the ‘Pan-African orogeny.
The region is composed of Neoproterozoic to Cambrian crustal blocks, dissected by large-scale shear zones (Palghat-Cauvery and Achankovil).
The Palghat-Cauvery Shear Zone System (PCSZ), separates the terrane into two parts, Archean Dharwar Craton in the north and the Neoproterozoic Madurai Block in the south.
The southern margin of this block is defined by the Achankovil Shear Zone.
Geology of the study area
The Achankovil Shear Zone (ACSZ) is major lineament of 8-10 km width and >100 km length.
The rocks in the zone display a prominent NW-SE trending foliation with steep dips to southwest.
Estimation of pressure and temperature (P-T) of this lithology was first carried out by Santosh (1987) based on conventional geothermometers and mineral equilibrium, that gave 700-800◦ C at 5.5-7.0 kbar.
Later study done by Nandakumar and Harley (2000) which is slightly higher 925 ± 20◦ C at 6.5-7.0 kbar .
3.1. Grt- Opx- Crd Gneiss
The Grt-Opx-Crd gneiss is a coarse-grained, granulite-facies rock with a probable pelitic protolith.
The mineralogy of a representative sample (KR19-5G1) is plagioclase (30-40%), ortho-pyroxene (20-30%), garnet (10-20%), K-feldspar (10-20%), quartz (5-10%), and cordierite (2-5%) with accessory of biotite, spinel, and sillimanite (Fig. 2a).
Garnet is very coarse-grained (3-6 mm) ,subidioblastic, and contains numerous fine-grained inclusions of sillimanite (0.05-0.2 mm), biotite (0.05-0.4 mm), spinel (0.05-0.1 mm), and quartz (0.05-0.1 mm).
The most significant feature of this rock is the direct contact relation of fine grained spinel and quartz (Spl + Qtz), which occur only as inclusions in garnet.
Spl + Qtz association has been regarded as one of the indicators for decompression at UHT conditions. This is the first finding of such an assemblage from the ACSZ.
Introduction
Petrophysic of the rocks
It is the study of the physical and chemical properties of the rocks related to the pores and fluid distribution
Porosity, is ratio between volume of void to the total voids of the rock.
Permeability, is ability of a porous material to allow fluids to pass through it.
Electric, most of the sedimentary rocks don’t have conductivity.
Radiation, clay rocks have 40K, radiate alpha ray.
Hardness, it depends on the cementing material and thickness of the sediments.
WELL LOGGING
The systematic recording of rock properties and it’s fluid contents in wells being drilled or produced to obtain various petrophysical parameters and characteristics of down hole sequences (G.E Archie 1950).
The measurement versus depth or time, or both, of one or more physical properties in a well.
These methods are particularly good when surface outcrops are not available, but a direct sample of the rock is needed to be sure of the lithology.
A wide range of physical parameters can be measured.
In some cases, the measurements are not direct, it require interpretation by analogy or by correlating values between two or more logs run in the same hole.
Provide information on lithology, boundaries of formations and stratigraphic correlation.
Determine Porosity, Permeability, water, oil and gas saturation.
Reservoir modeling and Structural studies… etc.
Types of Well Logging
Logs can be classified into several types under different category
Permeability and lithology Logs
Gamma Ray log
Self Potential [SP] log
Caliber log
Porosity Logs
Density log
Sonic log
Neutron log
Electrical Logs
Resistivity Log
For contact : omerupto3@gmail.com
The name ophiolite derived from Greek root which means
Ophio : snake or serpent Litho : Stone
The green colour, structure and texture of sheared ultramafic rocks is similar to some serpents
Economically :
Massive Sulphide
It founded within pillow lava most of massive Sulphide associated in ophiolites have well developed Gossans (bright colored iron oxide, hydroxides, and sulfides) which is very rich in gold.
Chromite
Stratiform (be tabular or pencil shape) or podiform (irregular shape) within ultra-mafic rocks
These deposits are developed on serpentinite peridotite
Laterites (nickel and iron)
Asbestos
Talc
Magenesite
ophiolite sequence :
Sediments
Pillow Lavas
Dykes
Gabbros
Layered Gabbro
Layered Peridotite
Upper mantle
The name ophiolite derived from Greek root which means
Ophio : snake or serpent Litho : Stone
The green colour, structure and texture of sheared ultramafic rocks is similar to some serpents
The term ophiolite was initially given to dark green shiny outcrops which composed of serpentines (serpentinite rocks)
later on become used not only to a single rock , but also to an association of related rock types which are found as a consistent of upper mantle rocks and oceanic crust.
ophiolite sequence
Sediments
Pillow Lavas
Dykes
Gabbros
Layered Gabbro
Layered Peridotite
Upper mantle
Komattite
Named after the Komati River in South Africa.
first described by Morris and Richard (twins) for ultramafic units in the Barberton Greenstone belt of South Africa.
Mostly of komatiite are Archean age
distributed in the Archaean shield areas.
Also a few are Proterozoic and Phanerozoic.
In all ages komatiites are highly magnesium.
Mostly a volcanic rock; occasionally intrusive.
Mafic rocks were identified as extrusive because of their volcanic textures and structures, and they seem to have been accepted as a normal component of Archean volcanic successions, Abitibi in Canada.
The ultramafic rocks were interpreted as intrusive which are founded as sills and dykes, Barberton in South Africa.
Spinifex texture-typical of Komatiites:
Komattite
Named after the Komati River in South Africa.
first described by Morris and Richard (twins) for ultramafic units in the Barberton Greenstone belt of South Africa.
Mostly of komatiite are Archean age
distributed in the Archaean shield areas.
Also a few are Proterozoic and Phanerozoic.
In all ages komatiites are highly magnesium.
Mostly a volcanic rock; occasionally intrusive.
Mafic rocks were identified as extrusive because of their volcanic textures and structures, and they seem to have been accepted as a normal component of Archean volcanic successions, Abitibi in Canada.
The ultramafic rocks were interpreted as intrusive which are founded as sills and dykes, Barberton in South Africa.
Spinifex texture-typical of Komatiites:
The name Spinifex refer to a spiky grass in Australian.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
How to Split Bills in the Odoo 17 POS ModuleCeline George
Bills have a main role in point of sale procedure. It will help to track sales, handling payments and giving receipts to customers. Bill splitting also has an important role in POS. For example, If some friends come together for dinner and if they want to divide the bill then it is possible by POS bill splitting. This slide will show how to split bills in odoo 17 POS.
Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
This presentation provides a briefing on how to upload submissions and documents in Google Classroom. It was prepared as part of an orientation for new Sainik School in-service teacher trainees. As a training officer, my goal is to ensure that you are comfortable and proficient with this essential tool for managing assignments and fostering student engagement.
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!
Ethnobotany and Ethnopharmacology:
Ethnobotany in herbal drug evaluation,
Impact of Ethnobotany in traditional medicine,
New development in herbals,
Bio-prospecting tools for drug discovery,
Role of Ethnopharmacology in drug evaluation,
Reverse Pharmacology.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
2. INTRODUCTION
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.
3. Types of gold deposits and it’s mine
TYPE OF DEPOSITS MINE
Placer ores Placer mining
Oxidized ores Open pit
Primary ores Underground mining
4. 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
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.
5. • 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".
8. • 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, Kempinkote and Ajjahanahalli.
• Gold also discovered by GSI in the Singbhum Craton, Aravalli
Craton, Bastar Craton and Southern Granulite Terrain (SGT).
9. • 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.
• India is the second-largest consumer of gold after China.
16. The prospects in SGT have been considered as the promising
areas for detailed exploration of gold.
The gold prospects in SGT can be broadly grouped into three
provinces
• Wynad-Nilgiri
• Malappuram
• Attappadi
All these prospects are located within the Cauvery Suture
Zone (CSZ).
Gold mineralization is associated with primary quartz
veins, placer and laterite.
19. Wynad-Nilgiri province
• Is located south of the Moyar Shear Zone (MSZ).
• Consists of :
o Migmatitised hornblende gneiss,
o Amphibolite, biotite gneiss,
o Garnet–biotite–sillimanite gneiss,
o Pyroxene granulite,
o Banded magnetite quartzite
• The auriferous quartz veins crop out as discordance with biotite
and hornblende-bearing gneiss and amphibolites in Maruda.
• Trending NE–SW, moderate to steep dip with an average width
of 0.5 m.
20. • Exploration and mining of gold in Wynad - Nilgiri
province was on progress during British rule in India as
reported from the note of King.
• The mineralized veins in these prospects have assay value
varying from 1 to 39 g/t of Au.
• Auriferous veins in this province are confined to 25 km
long and 10 km wide, NE–SW trending regional shear
zone.
24. Karnataka
• It is the largest producer of gold in India.
• Gold mines are located in Kolar, Dharwad and Hutti Gold
Field.
• Kolar Gold Fields is second deepest mines in the world
after Mponeng is south Africa (3.9 km).
25. Kolar Schist Belt
• Kolar schist belt is the richest ‘gold belt’ of India and ranks
among some of the foremost similar greenstone belts of the
world.
• During the last decade, the average grade of ore hovered
between 3 and 5 g/t
• The rocks of the schist belt show three phases of folding
and low pressure amphibolite facies of metamorphism,
B.I.F, metamorphosed basic volcanic rocks Recent
radiometric dating indicated around 2700 m.y.
26. • Broadly two types of gold mineralization i.e. gold- quartz
(free-milling type) and gold-sulphide-quartz lode
(refractory type) have been identified from this belt.
• Control of mineralization is structural control (shear zones)
• Kolar Gold Fields still has reserves that could yield 10
tonnes of gold per year for 15 years.
29. Hutti Gold Mines Ltd.
• One of the major gold producer mine in India, it is consist of
many field among them Hira-Buddini and Uti are the most
productive
• The host rocks are amphipolite and gneiss with quartz vein and
quartz lode sulphide.
• The Hutti mines has proven reserve of 52.55 tones and inferred
resource of over 75 tones.
• In 2010-11 the mine production was 2.22 tones.
• The mines has a production schedule according to which it aims
to reach a production of 2.9 tones during the 2011-2016 period.
33. Rajasthan
• Base metal mineralization in Rajasthan is most extensive
as indicated by clusters of ancient workings and the
present mining activity.
• The occurrence of gold, has been postulated in the
Paleoproterozoic belt extending from Nathdwara in the North
to Jhabua in Madhya Pradesh in the South, related to
greenstone belts.
• But little work has been done on the gold mineralization
hosted by the Paleoproterozoic sequence in Rajasthan.
• The Geological Survey of India has reported the occurrence of
copper and gold (0.1-2.6 g/t) in Ladera-Sakhun area.
35. Gold ore processing
The process can be done in four steps
Ore
Preparation
• Particle size
adjustment to
next processes
• Physical
concentration
and oxidation
pretreatment
Gold
Extraction
• Extraction of
gold from ore
into solution
and/or
concentrate
Gold
Purification
• Purification
of gold
bearing
solution
Gold
Production
• Recovery of
gold from
solution
37. 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.
38.
39. Gold and environmental impact
• Gold mining is one of the most destructive industries in the
world.
• It can displace communities and destroy pristine
environments, hurt workers.
• Contaminate drinking water.
• It pollutes water and land with mercury and cyanide
• Endangering the health of people and ecosystems.
• Producing gold for one wedding ring alone generates 20
tons of waste.
40.
41. CONCLUSION
• Gold one of the most precious base metal that has been
discovered and treated since long time back
• Has different occurrence and different uses
• Usually primary gold associated with quartz vein
• Gold in India associated with greenstone belt
• SGT considered as the most promising gold field
• Kolar, Hutti are the most productive gold field.
• The precious metal has also negative impact on the
environment
42. REFERENCES
• Geological survey of India (1994), Detailed information on gold ores in India, Geological
survey of India, 89 P.
• Geological Survey of India (nov 2011), Base document on Precious Metals & Minerals [Gold,
PGE, Diamond and Precious stones] CGPB Committee II, Geological Survey of India , 183 P.
• Ajit Kumar Sahoo, Rajagopa lKrishnamurthi, RavikantVadlamani,Kamal Lochan Pruseth
,Manju Narayanan,SajuVarghese and T. Pradeepkumar, Genetic aspects of gold
mineralization in the Southern Granulite Terrain, India. Ore Geology Reviews, 72 1243–
1262 (2016).
• N. N. Singh, A note on gold in southern Rajasthan-A conceptual model. International Journal
of Advancements in Research & Technology. Volume 3, Issue 1, 2278-7763 (2014).
• http://www.sbs.com.au/gold/story.php?storyid=128
• http://www.usfunds.com/slideshows/the-many-uses-of-gold/#.WHkElNJ97IV
• http://www.profitconfidential.com/gold/top-10-countries-highest-gold-reserves/
• http://investopiagroup.com/gold-demand-and-use/
• http://nodirtygold.earthworksaction.org/impacts#.WIrGPNJ97IU