GEOL/VI/12 Student's Copy
2 0 1 8
6th Semester
GEOLOGY
TWELFTH PAPER
Economic Geology
Full Marks 55
Time 2½ Hours
PART A—OBJECTIVE
Marks 20
The figures in the margin indicate full marks for the questions
SECTION—A
Marks 5
Tick the correct answer in the brackets provided 1×5=5
1. Geochemically scarce metals are carried in the structures of common rock
through the process of
atomic substitution
magmatic concentration
contact metasomatism
sublimation
/524 1 Contd.
2. The process of natural gravity separation of heavy from light minerals by
means of moving water or air by which the heavier minerals concentrated
into deposits is called
skarn
placer deposits
hypogene deposits
horses
3. Which of the following is not an ore of copper?
Chalcopyrite
Pyrrhotite
Psilomelane
Malachite
4. When sediments contain more than organic matter, it eventually forms
a rock known as
reservoir rock
imprevious rock
dolomites
black shale
5. Hydrothermal activity at the oceanic ridges give rise to
residual deposits
sulfide deposits
sedimentary deposits
oxide deposits
GEOL/VI/12 2 Contd.
SECTION—B
Marks 15
Write short notes on the following in 3 or 4 sentences each 3×5=15
1. Ore minerals
2. Gossan
3. Ore dressing
4. Occurrence of atomic minerals
5. Gold province of Karnataka
PART B—DESCRIPTIVE
Marks 35
The figures in the margin indicate full marks for the question
Answer five questions, taking one from each unit
UNIT—I
1. Write an account on the morphology of concordant and discordant ore
bodies. 7
2. Write notes on the following 3½+3½=7
Geological requirements for ore deposition
Grade of ore
UNIT—II
3. Write short notes on the following 3½+3½=7
Oxidation and supergene enrichment
Residual concentration
4. Discuss the process of magmatic concentration. Add a note on magmatic
deposits.
GEOL/VI/12 3 Contd.
UNIT—III
5. Write a note on chromite deposits of India with special reference to their
origin, mode of occurrence and distribution. 7
6. Give a brief account on different surface and sub-surface methods of
mineral explorations. 7
UNIT—IV
7. Discuss the origin, occurrence and distribution of coal in India. 7
8. Write descriptive notes on the following 3½+3½=7
Structural traps
Solar power
UNIT—V
9. Describe the various factors that control availability of economic mineral. 7
10. Write short notes on the following 3½+3½=7
Metallogenic epochs
Ore deposits in cratonic basins