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# Underground Precedences

The Precedences tab for Underground scenarios contains the Precedence Modes pane, 3D Canvas, and the pane that contains the Precedences data grid.

The Precedences Modes pane contains the Orbit, Select, and Add modes. You use Orbit mode to move the data in the 3D Canvas to better see the locations you want to select. You use Select mode to select locations in the 3D Canvas. When a location is selected, the precedences and priorities that are set for the location are displayed in the data grids. You use Add mode to create precedences between locations graphically.

The pane that contains the Precedences data grid contains five tabs. The default, Precedences, tab contains the Precedences data grid. The Precedences data grid allows you to define which mining locations cannot start until a previous mining location is completed.

Precedences can be defined between any combination of headings and locations. You can define precedences from headings to locations, from locations to headings, from headings to headings, and from locations to locations.

Precedences must be defined for headings that are not spatially connected. Spatially connected headings are mined according to the heading design, as was set up in the Setup Development > Connections tab, and do not need precedences defined.

You can define the precedences in the Precedences data grid or you can use the spreadsheet view. To access the spreadsheet view, select Spreadsheet > Enable Spreadsheet Views, and then select the Precedences spreadsheet. When the Precedences spreadsheet is enabled, it replaces the Precedences data grid.

The Development Priorities tab contains the Initial development priorities data grid. The Production Priorities tab contains the Initial production priorities data grid. The Development Priority Changes tab contains the Development priority changes data grid. The Production Priority Changes tab contains the Production priority changes data grid. The priorities data grids allow you to define the initial priory for each development and production location, and changes to the priorities throughout the schedule.

### Columns in the Precedences Data Grid

Column | Description
--- | ---
Active | Selected: The precedence rule is applied to the locations. Cleared: The precedence rule is not applied to the locations. Tip: When you clear the Active check box, you make the precedence rule ineffective without deleting the rule.
Predecessor | The heading in which mining must be partially complete or complete, or the mining location in which mining must be complete, before mining can begin in the Successor location. Tip: You can use named wildcards to specify precedences between multiple pairs of predecessor and successor locations. You specify multiple precedences by creating rules based on the names of the locations in the Named Wildcard Builder.
Length | The length from the start of the Predecessor heading that must be mined before the Successor heading or location becomes available for mining. Note: This field is available only if the Predecessor is a heading or contains a named wildcard.
Delay | The time, in days, that must pass after mining is complete in the Predecessor heading or location before the Successor heading or location becomes available for mining.
Successor | The heading or location that is not available for mining until mining is complete in the Predecessor heading or location. Tip: You can use named wildcards to specify precedences between multiple pairs of predecessor and successor locations. You specify multiple precedences by creating rules based on the names of the locations in the Named Wildcard Builder.
Length | The length from the start of the Successor heading or location at which mining can continue after the Predecessor heading or location is completed.
Comments | Any notes you want to make about the precedence.

Note: If multiple precedences are set up for a heading or location all of the predecessor headings and locations must be completed before the heading or location becomes available for mining. Precedences are different from heading connections. A secondary heading that has multiple connections can start when it is reached by any of the primary headings. A secondary heading that has multiple precedences can start only when all predecessor headings or locations are completed.

### See also

- Underground Priorities
- Connections
- Surface Precedences

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