5. Exploration Geophysics

Mineral Exploration — Quiz

Test your understanding of mineral exploration with 5 practice questions.

Practice Questions

Question 1

In a gravity survey for mineral exploration, a geophysicist observes a positive residual Bouguer anomaly after regional corrections. If the density contrast between the ore body and the host rock is $\Delta\rho$, and the thickness of the ore body is $h$, which of the following expressions best represents the gravitational effect of a simple, tabular ore body, assuming a 2D infinite horizontal slab model?

Question 2

A geophysicist is conducting a magnetic survey in the northern hemisphere and observes a strong, localized negative magnetic anomaly over a potential ore body. Assuming a normally polarized Earth's magnetic field, what does this anomaly most likely indicate about the magnetic properties of the underlying material?

Question 3

Induced Polarization (IP) surveys are highly effective for detecting disseminated sulfide deposits. The IP phenomenon is primarily related to the chargeability of rocks. Which of the following best describes the physical mechanism responsible for chargeability in disseminated sulfide deposits, and how is it measured in the time domain?

Question 4

Electromagnetic (EM) surveys are used to detect conductive ore bodies. For a highly conductive, tabular massive sulfide deposit, which of the following characteristics of the secondary EM field would be most indicative of its presence, and why?

Question 5

Integrating geophysical data with geological and geochemical data is a fundamental approach in modern mineral exploration. What is the primary advantage of this multidisciplinary integration in reducing exploration risk and improving targeting, particularly when dealing with complex ore systems?