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C-1. The image on the right shows an aerial view of an open mine - Leaving Cert DCG - Question C-1 - 2019
Question C-1
C-1. The image on the right shows an aerial view of an open mine. A portion of a similar mine area is represented on the accompanying map, located on the back page o... show full transcript
Worked Solution & Example Answer:C-1. The image on the right shows an aerial view of an open mine - Leaving Cert DCG - Question C-1 - 2019
Step 1
a) On the map supplied, draw a vertical section (profile) on the line AB.
Answer
To construct the vertical section on line AB, follow these steps:
- Measure the heights at key contour lines along AB using the accompanying contour map.
- Mark these heights on a vertical axis, establishing vertical lines at each contour intersection with line AB.
- Connect these points to illustrate the profile of the stratum along line AB.
Step 2
b) Points C, D and E are outcrop points on the surface of a stratum of ore. Draw the plan and elevation of the triangle CDE.
Answer
For the triangle CDE:
- Plan of triangle CDE: Plot points C, D, and E on a horizontal plane using their coordinates from the contour map. Connect these points to form triangle CDE.
- Elevation of triangle CDE: Determine the elevations of points C, D, and E based on contour lines. Sketch the triangle in a vertical view to represent its elevation.
Step 3
c) Determine the strike and dip of the stratum.
Answer
To calculate the strike and dip:
- Identify a horizontal line in elevation along the stratum.
- Determine the strike as the direction of this horizontal line, typically expressed in degrees relative to north.
- For the dip, measure the angle between the horizontal plane and the stratum, observing the angles from two heights for a comprehensive view of the incline.