Two intersecting shear zones have the following attitudes: N80°E, 75°S and N60°E, 52°NW.

1. What is the orientation of the line of intersection?

2. What is the orientation of the plane perpendicular to the line of intersection?

3. What is the obtuse angle between the shear zones within this plane?

4. What is the orientation of the plane that bisects the obtuse angle?

5. A mining adit is to be driven to the line of intersection of the two shear zones. For maximum stability the adit is to bisect the obtuse angle between the two shear zones and intersect the line of intersection perpendicularly. What should the trend and plunge of the adit be?

6. If the adit is to approach the line of intersection from the southeast, will the full ore carts be going uphill or downhill as they come out of the mine?