Dips > Data Input > Traverses
Mapping in magnetic orebodies (sulphides, disseminated base metals) is normally impossible using a magnetic compass. Difficulties may also arise where rockbolts 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
This 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 Orientation
The azimuth of the REFERENCE LINE is input in the Traverse Information dialog as the ORIENTATION 1 of the traverse.
This value is ADDED to the DIPDIRECTION or STRIKE data measured on the traverse and recorded in the Orientation Columns .
The CLINORULE traverse acts as a LINEAR traverse for bias correction.
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.DIP file, which you should find in the Examples folder in your Dips installation folder.