CMA Geology & Mineral Exploration 2

Question 1

Which geophysical method measures variations in Earth's gravitational field to detect subsurface density contrasts?

Accepted Answer

Gravity survey

Answer

Gravity surveys detect density variations in subsurface rock formations, useful for locating ore bodies and salt domes.

Question 2

In mineral exploration, what does the term 'strike' refer to?

Accepted Answer

The direction of a vein or ore body along the horizontal

Answer

Strike is the compass direction of a horizontal line on an inclined geological surface such as a vein or bed.

Question 3

Which type of metamorphism occurs when rock is altered by heat and pressure from a nearby igneous intrusion?

Accepted Answer

Contact metamorphism

Answer

Contact metamorphism results from heat-driven alteration in the zone surrounding a magmatic intrusion, often creating economically valuable skarns.

Question 4

A porphyry copper deposit is primarily associated with which geological setting?

Accepted Answer

Subduction zone magmatic arcs

Answer

Porphyry copper deposits form in magmatic arcs above subduction zones where calc-alkaline magmas intrude and release copper-bearing hydrothermal fluids.

Question 5

What is the primary purpose of an induced polarization (IP) survey in mineral exploration?

Accepted Answer

To detect disseminated sulfide minerals in subsurface rocks

Answer

IP surveys measure the chargeability of rocks, effectively detecting disseminated sulfides which are often associated with porphyry and epithermal deposits.

(CMA) Certified Minerals Appraiser Practice Test

(CMA) Certified Minerals Appraiser Practice Test

CMA Geology & Mineral Exploration 2