Add Row

On the Mining | Blast Design tab, in the Drillhole Pattern group: Click Add Row to add a new row to a blast block. Hole, location and charge parameters can be specified beforehand in an Row Properties form.

See also: Extend Row

Hole Parameters

Hole type

Holes may be blasted for different purposes. You may want to differentiate between main, pre-splitting and auxiliary holes, for example.

If applicable, select the Hole Type. Hole types are configured on the Mining | Blast Design tab, in the Hole Type group.

Hole length

Enter the Hole Length value for the holes along the new row in the field provided.

Subdrill

If blastholes are to be drilled below the design floor, enter the length of sub-drilling required. See: Sub-Drilling

Hole diameter

Enter the diameter (in millimetres) for the holes along the row. Hole diameter is a fundamental factor in blast geometry since it affects the results that can be achieved from blasting.

Hole Location

Enter parameters to define the Inclination, Spacing and Azimuth of the holes along the row.

Inclination

The hole Inclination is the angle the hole makes with the azimuth, in the range 0 (horizontal) to - 90 (vertical). If no values are specified, a default inclination of -90 (vertical) and a default azimuth of zero are used.

Azimuth

The hole Azimuth is a bearing in degrees, measured from 0 for North and increasing clockwise. It will have no effect on a vertical hole (inclination of - 90). The Perpendicular to row check box option allows you to specify an azimuth which is perpendicular to the row.

Charge Details

Charge Template

Double click (F3) in the Charge Template field, or click the List icon, to select a charge template for the row, if required.

Hole Level

The designed blastholes can be draped onto a wireframe of the topography. The draping can be to the Bench and/or the Floor.

Bench Surface

Select the Bench surface option to select a wireframe Type and Name to drape the blast hole onto.

If the Bench surface is not selected and provided, hole collars assume the block polygon elevation. Providing the Bench surface will mean hole collars are snapped to the bench surface.

Floor Surface

Select the Floor surface option to select a wireframe Type and Name to drape the blast hole onto.

OK

When you have defined the parameters of the holes along the row, click OK. Edit Row mode is enabled and you can move the mouse to digitise a point, the cursor will change to a crosshair cursor.

Use the mouse to digitise the length (start and end point) of the new row. Hole locations are inserted using the spacing and the numbering parameters specified in the form.

To extend the string and restrict the new point to the direction of the last segment, hold down the CTRL key as you digitise the point with the mouse.

To extend a string and restrict the new point to be perpendicular to the last segment, hold down the SHIFT key as you use the mouse to digitise the point.

To extend the string and restrict the point to the screen axis, hold down the x, y, z, u, or v letter key as you digitise the point with the mouse.

To finish a row, move the mouse away from the row end point and right-click the mouse.

To extend an existing row, see: Extend Row