The 3 point problem

This presentation is to be completed in conjunction with exercise

The 3 point problem: Example

Here is our original map. Fill

Step 1:
Draw a line between the outcrop at the highest

The 3 point problem: Example

Step 1 continued:
Measure the map distance

The 3 point problem: Example

Step 2:
Now, along the blue line

The 3 point problem: Example

Step 3:
Now, measure 401m along the

The 3 point problem: Example

Step 4:
The dip is perpendicular (at

The 3 point problem: Example

Step 5:
To figure out the true

The 3 point problem: Example

Step 5 continued:
Set up another triangle

The 3 point problem: Example

Step 5:
To figure out the outcrop

The 3 point problem: Example

Step 5 continued:
Now draw in your

The 3 point problem: Example

Step 5 continued:
After you’ve drawn in

The 3 point problem: Example

Step 5 continued:
Now roughly connect up

The 3 point problem: Problem

Now have a go at the

Scale= 500m/2.5cm = 20m per mm; Therefore distance from C to

Step 2

tan(10.6°) = (200m/adj) adj = (200m/tan(10.6°)) = 1069m

Step 3

Step 4

Step 5

tan(θ) = (opp/adj) tan(θ) = (200m/1000m) tan-1(200m/1000m) = θ = 11.3°
True

Step 5

Now draw in the structure contours.
As the length

Step 5

Now add in the areas the coal
seam will outcrop

Step 5

Now fill in the outcrop pattern
(remembering your Law of

Questions
Deduce the dip and strike of the coal seam which

Summary

We have now worked through how to find the direction