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63. 9 Listen to the report on the resistivity survey conducted at Sulfurbank Mercury Mine Superfund site and identify the steps of the investigation.

Activities

Order of the Step

A

The near surface areas containing high concentrations of sulfide minerals were identified.

B

Electromagnetic conductivity survey was carried out over twelve square kilometers area.

C

One anomaly was chosen for detailed ground electromagnetic conductivity survey.

D

The samples were taken from every three meters along the constructed lines.

E

The geophysical survey determined flow paths for mercury rich acid waters.

F

The conductive zones of probable pathways for ground water flow were detected.

G

About 1.5 million irregularly spaced samples were obtained.

H

The wire metric mapping was produced with CTAX software.

I

Four magnetic and ore-conductive anomalies were identified.

64. 9 Listen to the presentation on electromagnetic instrumentations and match the comments on slides (1-5) with the images (a-e). One comment is extra.

EM31

A Top Plot

  1. shows results of the most sensitive survey

B Middle Plot

  1. shows the limits of landfield containing buried metal

C Bottom Plot

  1. excludes from results areas with small metal degree

EM61

  1. shows contour shaded in orange and red

D Top Plot

  1. shows results of iron ore prospecting

E Bottom Plot

  1. gives data on identification of parameter of buried waste in associated leachate

65. Using the diagram describe the general principle of electrical survey.

(a) an ore deposit

(b) natural ground currents.

(с) buried electrodes

(d) millivoltmeter

66. You are going to make a short research project. You should spend 5 -15 minutes to examine “Electrical survey” from each of the following aspects. The results of your research should be arranged in your report.

  • Describe it (What does it look like? What is it?);

  • Compare it (What is it similar to? How does it differ from magnetic or gravity survey?);

  • Analyze it (What is its principle? What types are there? What components does it include? What devices are necessary?);

  • Apply it (What can you do with it? What can you use it for?);

  • Argue for or against (Take either positions. Give reasons);

  • Associate it (What do you associate it with? What does it remind you of?);

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