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CORE ORIENTATION SYSTEMS CONTINUED
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GONIOMETER MODEL 76
To visually confirm goniometer settings, the base with the large scale should be aligned with North and placed on a
stable surface (figure 1).
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Remove the outer strike and dip direction ring from base. Select the plastic insert to match the core size.
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Rotate the core holder to set "Drift Direction" of the hole (figure 2).
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Set the "Drift Angle" on the protractor mounted at the side of the core holder (figure 3).
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Align the short bent end of the drift angle pointer to the small top scale, with the same reading indicated
directly below on the large scale (figure 4).
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To position the "Orientation Lug" rotate the double ended pointer over the small top scale to the specified
azimuth reading.
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Place the core in the core holder. Position the Master Scribe on the core in line with the double-ended pointer.
Clamp the core in position (figure 5).
THE CORE IS NOW IN A RELATIVE INSITU POSITION !!
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Place the outer strike and dip direction ring back on the base.
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Rotate and angle the sighting ring so that it appears to be a parallel extension of the planar feature
to be examined.
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Read the "Strike" of the feature at the appropriate pointer located in a Northern quadrant on the base
ring.
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Read "Dip Direction" at the appropriate pointer on the base ring.
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Read "Dip Angle" on the protractor mounted at the side of the outer strike and dip direction Ring.
Figure 1
Photographs courtesy of:
Brown, A.B., 2001, Analysis of structures in non-oriented drillcore from the Meliadine West Gold Deposit,
Nunavut: Unpublished M.Sc. thesis, Laurentian University, Sudbury, Ontario, Canada.
Figure 2
The bore hole drift direction is set on the inner assembly vernier scale. This information is retrieved
from the Multi-Shot survey instrument.
Figure 3
The bore hole drift angle is set on the inner assembly angular protractor. This information is retrieved from
the Multi-Shot survey instrument.
Figure 4
Set the double ended pointer to the small top outer scale "Master Scribe" reading from The Mult-Shot survey
data "Orientation Lug". Place the core in the core holder while aligning the master scribe to double ended
pointer.
Figure 5
Place the outer strike and dip direction ring back on the base while aligning this ring so that it appears
to be a parallel extension of the planar feature in the core.
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International Directional Services
12030 East Riggs Road
Chandler, Arizona 85249
Tel: 480.824.7100
Fax: 480.883.2010
E-mail: idsinfo@idirectionaldrill.com
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