Mineral Resources
Introduction to Mineral Resources
- Definition: Mineral resources are natural, inorganic substances found in the earth’s crust, formed by geological processes over millions of years. They are non-renewable and have definite physical and chemical properties.
- Importance:
- Fundamental for economic development.
- Support industrial growth, infrastructure development, and technological advancement.
- Essential for everyday life – from buildings to smartphones.
- Formation:
- Igneous activity: Formation from molten magma.
- Sedimentation: Layers of minerals formed under pressure.
- Metamorphism: Minerals altered by heat and pressure.
- Distribution: Uneven across regions; influenced by geological factors like plate tectonics, rock types, and climatic conditions.
Ore and Its Significance
- Ore: A rock or mineral from which a metal or other valuable substance can be extracted profitably.
- Significance: Economically viable for mining and industrial use.
Examples of Ores and Their Metals:
| Ore | Metal Extracted |
| Bauxite | Aluminium |
| Hematite, Magnetite | Iron |
| Chalcopyrite | Copper |
| Galena | Lead |
| Cinnabar | Mercury |
Importance of Minerals
- Industrial Use: Machinery, electronics, vehicles (e.g., iron, aluminium, copper).
- Construction & Manufacturing: Cement (limestone), steel (iron), ceramics (feldspar, kaolin).
- Health & Daily Use:
- Iodine in salt
- Fluoride in toothpaste
- Talc in cosmetics
- Zinc in medicine
Properties of Minerals
- Physical Properties:
- Color, luster, streak, hardness (Mohs scale), density, cleavage, fracture.
- Chemical Properties:
- Elemental composition.
- Reaction to acids, heat, or oxidation.
Types of Minerals (By Chemical Composition)
| Group | Examples |
| Native Elements | Gold, Silver, Copper |
| Oxides | Hematite (Fe₂O₃), Bauxite (Al₂O₃) |
| Hydroxides | Goethite |
| Sulfides | Galena (PbS), Pyrite (FeS₂) |
| Sulfates | Gypsum (CaSO₄·2H₂O) |
| Carbonates | Calcite (CaCO₃), Dolomite |
| Phosphates | Apatite (used in fertilizer) |
| Halides | Halite (NaCl), Fluorite (CaF₂) |
| Silicates | Mica, Feldspar, Quartz (most abundant) |
- Types: Orthosilicates, Ring silicates, Chain silicates, Sheet silicates, Framework silicates
Categories of Mineral Resources
A. Metallic Minerals
- Ferrous: Contain iron. E.g., Iron ore, Manganese, Chromite.
- Non-Ferrous: No iron. E.g., Bauxite, Copper, Lead, Zinc.
B. Non-Metallic Minerals
- Do not yield metals on processing.
- Used in cement, ceramics, fertilizers, salt, glass.
- E.g., Limestone, Mica, Gypsum, Phosphorite, Potash.
Hazards of Mining
- Risks to Miners:
- Collapses and accidents.
- Toxic gas exposure, silicosis, asbestosis.
- Environmental Impact:
- Deforestation, soil erosion, water contamination.
- Land degradation and biodiversity loss.
- Health Concerns:
- Respiratory diseases, water-borne illnesses.
- Displacement of communities and tribal populations.
Conservation of Minerals
Why Conserve?
- Finite and non-renewable resources.
- Essential for intergenerational equity and sustainability.
Methods:
- Promote recycling (e.g., metals, e-waste).
- Use renewable alternatives (solar instead of coal).
- Adopt eco-friendly mining (surface vs deep mining).
- Encourage efficient technologies and urban mining.
Top Mineral Producers in the World
| Mineral | Top Producer |
| Iron Ore | Australia |
| Bauxite | Australia |
| Copper | Chile |
| Gold | China |
| Diamond | Russia |
| Coal | China |
India is among the top 5 producers of mica, iron ore, bauxite, chromite.
Uses of Minerals
- Industrial Applications: Machinery, vehicles, power plants (iron, copper, coal).
- Jewelry and Precious Metals: Gold, silver, diamond, platinum.
- Energy & Technology:
- Uranium for nuclear energy.
- Silicon for semiconductors.
- Lithium for batteries.
Examples of Common and Rare Minerals
| Common | Rare/Precious |
| Quartz, Calcite, Mica | Uraninite, Zircon, Diamond |
| Feldspar, Talc | Platinum, Rhodium |
Conservation Strategies for Mineral Resources
- Sustainable Mining: Environmental clearances, low-waste techniques.
- Recycling: Metals from scrap, e-waste recovery.
- Research & Innovation: Synthetic materials, alternatives like composites.
- Urban Mining: Recovering resources from cities (phones, appliances).
Crystal Types and Detection of Minerals
- Crystal Systems:
- Cubic, Tetragonal, Orthorhombic, Hexagonal, Monoclinic, Triclinic.
- Detection Techniques:
- Hand specimen tests: Color, hardness, luster.
- Advanced methods: X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), chemical analysis, spectroscopy.
