Minerals and Ores

Potential resources may be used in the future.

Silica (silicon dioxide, SiO2) is the most abundant mineral compound in Earth's crust, constituting about 59% of the crust by volume. It is the primary component of sand and quartz, and forms the basis for most igneous, metamorphic, and sedimentary rocks. While bauxite (aluminum ore), manganese, and iron are important minerals, they occur in much smaller quantities compared to silica. The abundance of silica reflects the dominance of oxygen and silicon as the two most abundant elements in the Earth's crust.

Koderma in Jharkhand is famous as India's leading mica mining center. The region has abundant deposits of high-quality mica, which is used in electrical and electronic industries, as well as in cosmetics.

The Damodar Valley contains India's largest coal reserves and is the most important coal-bearing region in the country. It houses major coalfields like Raniganj, Jharia, Bokaro, and Karanpura, which are crucial for India's industrial and energy needs. Godavari, Krishna, and Son valleys have other resources but are not primarily known for coal concentration.

Bauxite is the principal ore of aluminium, containing hydrated aluminium oxides like gibbsite, boehmite, and diaspore. It's the primary commercial source for aluminium extraction through the Bayer process. Bauxite forms through the weathering of aluminium-rich rocks in tropical climates.

Radium was first isolated from pitchblende (also called uraninite) by Marie and Pierre Curie in 1898. Pitchblende is a uranium-rich ore that contains trace amounts of radium along with other radioactive elements. The Curies processed tons of pitchblende to extract small amounts of radium.

Statement 1 is incorrect - most Indian iron ore is hematite, not limonite. Statement 2 is correct - magnetite deposits occur in Dharwar and Cuddapah rock systems. Statement 3 is incorrect - sphalerite (zinc) and galena (lead) are found in sedimentary rocks of Rajasthan, Andhra Pradesh, and Gujarat, not primarily in pre-Cambrian rocks. Only statement 2 is correct.

All three pairs are correctly matched. Amarkantak in Madhya Pradesh has bauxite deposits, Barabil-Koira valley (spanning Odisha and Jharkhand) has rich hematite iron ore deposits, and Salem district in Tamil Nadu is known for magnesite deposits.

Raniganj, located in West Bengal and Jharkhand, houses India's oldest and one of the largest coal fields. It has been mining coal since the 18th century and remains a major coal-producing region. Iron ore is mined in places like Bailadila and Bonai; manganese in Nagpur and Balaghat; mica in Hazaribagh and Nellore.

India is the world's largest producer and exporter of mica, particularly from the states of Jharkhand, Bihar, and Andhra Pradesh. Indian mica is known for its superior quality. India is not a major producer of lead, zinc, or gold compared to other countries like China, Australia, or South Africa.

Anglesite (PbSO₄) is an ore of plumbum. Cerussite is a mineral consisting of lead carbonate (PbCO₃), and an important ore of plumbum. Galena (PbS) is the primary ore mineral of plumbum.  

This option is correct.

About 80% of the world's primary copper comes from ores in which copper is present as a sulphide mineral, i.e. chalcopyrite (CuFeS₂).

Dolomite is a CaCO₃.MgCO₃, Azurite is a 2[CuCO₃].Cu(OH)₂ , Siderite is a FeCO₃ and Malachite is a CuCO₃.Cu(OH)₂ all are Carbonate ores.