Clinorule

Mapping in magnetic ore bodies (sulphides, disseminated base metals) is normally impossible using a magnetic compass. Difficulties may also arise where rock bolts and screen are present as ground support in underground excavations.

In these environments, it is necessary to measure joint orientations using a device called the Clinorule.

Clinorule Description

The Clinorule is a simple device (normally used in carpentry or by underground drillers) consisting of two arms connected at one end by a pivot hinge. On this hinge, there is an angle measure (ranging from 0 to 180 or from 0 to 360 degrees) to record the angle formed by the two hinged arms. It is handy, as well, if one of the arms is fitted with a bubble level along its EDGE. This is to allow accurate measurement of Dip.

Data Measurement

Dip is measured by holding the arm with the level in a horizontal position such that the other arm moves in a vertical plane about the hinge. Move the second arm until it is parallel with the Dip (line of maximum slope) in the joint plane. Read off the (acute) angle as the Dip.

The azimuth direction is taken as a relative angle with respect to a Reference Line. This line is usually the axis of a drift of tunnel but can be any reference direction which is known (accurate measure of this reference azimuth should be taken from level plans).

For example, if the Clinorule is used to measure relative Strike, hold one arm of the clinorule so that it is parallel to the Reference Line. Treat this as local "north". Move the other arm (in a horizontal plane) so that it is parallel to the strike line (line in the plane which is horizontal) obeying the RIGHT or LEFT HAND RULE as appropriate (be consistent). Read this angle as the apparent Strike.

Traverse ID

For a Clinorule Traverse Type, the default Traverse ID will have a "CL" prefix (e.g., CL1, CL2, ...) when you initially add/create Traverses. After adding Traverses you can change the default ID values to any numeric or alpha-numeric values.

Data Format

The Data Format options for a Clinorule Traverse are the same as for a Linear Traverse.

• Dip/DipDirection
• Strike(Right)/Dip
• Strike(Left)/Dip
• Trend/Plunge

See the Linear Traverse topic for details.

Traverse Format

The Traverse Format for a Clinorule Traverse is always Trend / Plunge, and is applied as follows.

• The azimuth of the Clinorule REFERENCE LINE (see above) is input in the Traverse Information dialog as the Trend of the Traverse.
• This value is added to the Dip Direction or Strike data measured on the Traverse and recorded in the Orientation Columns .
• The Clinorule Traverse acts as a Linear Traverse for bias correction.

Example of Traverse Information dialog with three Clinorule Traverses

Declination

Ensure that the Declination in the Project Settings dialog is ZERO if Clinorule drift orientations are taken from grid north.

Examples

An example Traverse information line (in the Dips data file) for a horizontal Clinorule Reference Line with an azimuth of 250 degrees is shown below:

1;CLINORULE;250;00;Main Access Drift

An example Dips file which uses the Clinorule Traverse Type is the EXAMCLIN.dips8 file, which you should find in the Examples folder in your Dips installation folder.