Step 4: The vein is dipping towards the SE, therefore count in 62E from east side on the primitive circle.

Step 5: Trace the 62E degree great circle.

Given : Copper-bearing quartz vein (Problem 1) oriented N20E / 62ESE

Step 1: Think about what it should look like. What is the orientation of the strike? In which general direction does it dip?

Step 2: With the stereonet oriented north, locate the strike of the planar feature, and place a tick in the appropriate position.

Step 3: Rotate the stereonet so the strike (tick) is at the north position.

N

ON20 E

O62

ON20 E

N

E

S

W

Step 6: Rotate the stereonet back to its original position, and check that it appears correct.

Step 7: LABEL IT.

N

Qtz vein #1

Plotting Cyclographic Projections & Poles of Planar Features

NOTE: At this point, plotting the pole can be easily done.

Step 5(a): Since the pole is perpendicular to the plane of interest, count in 90E (along the E-W small circle) from the cyclographic trace drawn in step 5.

Step 5(b): LABEL IT.

O90

Quarz vein #1

N

Average N23E / 63SE

AverageN30E / 60ESE

Solution - Problem 1

N

N

Joint X

Joint X

Joint X

Joint Y

Joint Y

Joint Y

Intersectionof joints Xand Y

Intersectionof joints Xand Y

Step 1: Plot the cyclographic traces of both joints (as in problem 1).

Step 2: Find the intersection of the two joints, and rotate it to the N-S great circle.

Step 3: PLUNGE DETERMINATION Count degrees from primitive circle down to the intersection -- this is the PLUNGE.

Step 4: TREND DETERMINATION Draw a line from intersection to the primitive circle, then rotate the stereonet back to the original position and read off the TREND.

Step 5: LABEL IT.

ANSWER PROBLEM 2(A): 37E / N41W

N41W

37

37

Calculation of IntersectionLineation

Given : The orientation of any 2 intersecting planar features.Example: Problem 2

N

N

B) Locate the rake of joint X in the plane of joint Y.Step 1: Because joint X is in joint Y, rotate

joint Y to the north position.Step 2: Count the degrees down along the great circle from north to the intersection of joint X and joint Y, -- this is the rake.

ANSWER: 67E from North side

C) Locate the rake of joint Y in the plane of joint X.Follow the same procedure as above, but rotate

joint X to the north position instead of joint Y,and count the degrees to the intersection withjoint Y.

ANSWER: 38E from the N side

O67

Joint Y

Joint Y

Joint X

Joint X

O38

N

Calculation of Rake (Pitch)

Refer to problems 2 (b) & (c)

Solution - Problem II (d) & (e)

N

Joint X

Joint Y

E-W Roadcut

N-S Roadcut

O16

O61

O39

O73

Follow the same procedure as in Problem II (b) & (c).

Answers: (d) rake of joint Y on N-S roadcut 16EN rake of joint X on N-S roadcut 61ES

(e) rake of joint Y on E-W roadcut 73EW rake of joint X on E-W roadcut 39EW

N

Bedding

Schistosity

Fault

Large QuartzVein

N136E

O15

O25 SE

O15 SE

N10E

O25 N

O28 N

Solution - Problem III

Follow the same procedures as in Problems I & II.

ANSWERSb - 1 - i) 15E/ N136Eb - 1 - ii) 25ESEb - 1 - iii) 15ESE

b - 2 - i) 25E/ N10Eb - 2 - ii) 25EN (or NE)b - 2 - iii) 28EN (or NE)