Set Up

Specify Blast Defaults

The Set Up option to select the site, deposit and general blast hole pattern parameters for the blast to be designed or edited.

The sites and deposits available must have been defined in the blastdes.spc file, which resides in the $ENVIS_RESO area. Also defined in this file are corresponding defaults, such as datum level and bench height.

Instructions

Select Open Pit menu
Select Blast Design Bench submenu
Select Set Up option

Select the required site (defined in the blastdes.spc file) from the list.

Select the required deposit.

Note

You won't be prompted to select a site or deposit if only one site/deposit has been defined in the blastdes.spc file. If this is the case, then the deposit design file will be automatically opened.

The following panel is then displayed.

Blast Bench Setup panel

Deposit

This shows the name of the deposit selected in the previous step. It can be overwritten, in which case it must be another existing deposit.

Blast number

The blast (and bench) number are used to create the layer name of the blast outline and the layer name of the blastholes. The layer name for the outlines is <bench number>_<blast number>_BD and the layer name for blastholes is <bench number>_<blast number>_HO .

Bench height

Enter the bench height. The default value is the height set in the. spc file.

Calculate RL

Select this option to calculate the nominal RL from the datum level, bench number and bench height. The default Z value is then set to the calculated value. Alternatively, you can select the Input RL option, which to set the toe elevation by specifying the Z value.

Bench Number

Enter the bench number. This number in conjunction with the blast number will be used to create the layer names of the outlines and blastholes.

Input RL

Select this option to specify the nominal toe RL.

Toe RL

Enter the toe RL. The integral bench number will be calculated from this value and the datum level and then will be used in conjunction with the blast number to create the layer names of the outlines and blasts.

Extend to full bench height/Extend to half bench height

Select Extend to full bench height to produce holes that start at the bench toe RL and extend the full bench height up to form the collars at the top of the bench.
Select Extend to half bench height to produce holes that start at the bench toe RL and extend a half bench up to form collars at a mid bench surface.

Diagram 1 - Upper RL/Mid RL

Burden

Enter the distance between adjacent rows in a pattern.

Spacing

Enter the distance between adjacent holes in a row.

Diagram 2 - Burden, Spacing, Square Pattern

Diagram 3 - Burden, Spacing, Offset Pattern

Orientation

Enter the orientation of the blastholes, which must be between 0 - 360 degrees. This is the bearing of an angled hole.

Angle

Enter the hole angle, which must be between 0 - 90 degrees deviation from vertical. This is NOT the dip of the hole, 60° is a down hole of 30° dip.

Sub Drill

Enter the depth to which a blast hole will be drilled below the toe of the bench. This is the vertical depth of extra drilling.

Minimum drilling length

Enter the minimum drilling length. Any hole with a length less than this will not be created.

Square Pattern

Select this option to create a square layout (see Diagram 2). Alternatively, select the Offset Pattern option to create a staggered layout.

Offset Pattern

Select this option to create a staggered layout (see Diagram 3).

Equilateral

Select this check box to use the equilateral pattern on the staggered layout. The spacing is used to determine the length of the triangle side.

Diagram 4 - Length of Triangle Side

Map scale

Enter the map scale. The map scale and the size of the text will determine the size of the text on the screen. For example, if the text size is set to 0.30 and the map scale to 1:100, text will appear on the screen the same size as an object that is 30 units tall.

Text rotation

Enter the angle of rotation of the text block. For example, 0° = horizontal (as normal text), 90° = vertical.

Accuracy

Enter the tolerance factor for generating registered outlines.

Diagram 5 - Tolerance Factor

Hole name prefix

Enter an optional 5 alphanumeric character prefix. This prefix will be used to name the holes.

Density

Enter the density. The density is used to calculate tonnage in the Tonnage option under Explosive Analysis.

Symbol radius

Enter, in metres, the radius of the symbols.

Offset compared holes

Select this check box to offset compared holes by a tolerance. The tolerance is specified through the Comparison option.

Colours

Select colours for the following:

designed outline
registered outline
Tie in
layout holes
survey holes
single holes
compared holes

Select OK.

The design database ( <proj><deposit>.dgd ) is opened and relevant layers ( <bench number>_<blast number>_* ) loaded.