Geoscience Reference
In-Depth Information
ings from drillhole data, derive level maps from the sectional
drawings, and generate volumetric estimates.
Question 1:
Using the drill hole information given below,
generate cross sectional views (easting-
elevation) for 10100N, 10200N, 10300NE,
10400N and 10500N looking north. Label
each drawing appropriately including the
location of the drill station, the trace of the
drill holes, an interpreted outline of the ore
body, and other labels and notes. Your inter-
pretation of the ore body limits should con-
sider the drillhole data, the conceptual model
briely described above, and realistic limits
for extrapolation.
Question 2:
To check the consistency of the ive cross
sections, generate two N-S sections at 7200E
and 7400E, and two level maps at elevations
700 and 500 m. On each drawing, include
the location of the drill stations, the trace
of the drill holes, your interpreted outline
of the ore body, and appropriate labels and
notes. Revise your interpretation if there are
abrupt discontinuities in the sectional or level
drawings.
Question 3:
Using the ive cross sections from Question 1,
estimate the volume of ore contained within
the deposit. Critically evaluate your results.
In particular, consider the potential for error,
how to minimize such error, and how you
would assess uncertainty.
10300 N
7000E
Elevation:
1000m
Station C
Collar:
Hole #
From
o
Dip
Azimuth
ock Type
DH7
0
323
-30
90
aste
323
407
-30
90
ore
407
491
-30
90
aste
491
617
-30
90
ore
617
659
-30
90
aste
DH8
0
310
-47
90
aste
310
420
-47
90
ore
420
487
-47
90
aste
487
646
-47
90
ore
646
682
-47
90
aste
DH9
0
344
-61
90
aste
344
445
-61
90
ore
445
512
-61
90
aste
512
604
-61
90
ore
604
701
-61
90
aste
Station D
Collar:
10400N
7000E
Elevation:
1000m
Hole #
From
o
Dip
Azimuth
ock Type
DH10
0
487
-28
90
aste
487
601
-28
90
ore
601
623
-28
90
aste
DH11
0
302
-46
90
aste
302
390
-46
90
ore
390
466
-46
90
aste
466
604
-46
90
ore
604
688
-46
90
aste
DH12
0
327
-59
90
aste
327
373
-59
90
ore
373
470
-59
90
aste
470
621
-59
90
ore
621
645
-59
90
aste
Station E
Collar:
10500N
7000E
Elevation:
1000m
Hole #
From
o
Dip
Azimuth
ock Type
DH13
0
445
-33
90
aste
445
562
-33
90
ore
562
593
-33
90
aste
Drill Data:
DH14
0
470
-47
90
aste
470
588
-47
90
ore
588
632
-47
90
aste
DH15
0
478
-58
90
aste
Drill Station Data
Station A
Collar:
10100N
7000E
Elevation:
1000m
478
600
-58
90
ore
600
658
-58
90
aste
Hole #
From
o
Dip
Azimuth
ock Type
DH1
0
595
-33
90
aste
DH2
0
725
-51
90
aste
3.6.2
Part Two: Coordinate Systems
DH3
0
800
-66
90
aste
Station B
Collar:
10200N
7000E
Elevation:
1000m
Hole #
From
o
Dip
Azimuth
ock Type
Consider a tabular deposit with a strike direction at an azi-
muth of 70° (East of North). The dip is at − 35° (downward)
to the Northwest. The original X, Y, and Z coordinate system
is aligned toward the East, North and Elevation, respectively.
Question 1:
Write the matrix equation to rotate the
x, y
system to the
x'
,
y'
system (so that
x'
is in the
dip direction and
y'
in the strike direction).
Write the matrix equation to rotate the
x', z
system to the
x", z'
system (so that
x'
is down
the dip direction). Show the matrix equations
in terms of an azimuth angle (α) and dip angle
(β) and in numeric form. Deine all your terms
and comment on your results.
DH4
0
331
-29
90
aste
331
390
-29
90
ore
390
474
-29
90
aste
474
609
-29
90
ore
609
701
-29
90
aste
DH5
0
302
-44
90
aste
302
407
-44
90
ore
407
462
-44
90
aste
462
634
-44
90
ore
634
725
-44
90
aste
DH6
0
320
-60
90
aste
320
408
-60
90
ore
408
512
-60
90
aste
512
629
-60
90
ore
629
712
-60
90
aste
