This command finds the largest portion of a bed such that the composited qualities meet the specified parameter filter. The bed can be split by key/non-key status or by name. With the status method, the bed portion the passes the filter is set key and the rest is set non-key. For the name option, you can specify the bed name for the portion that passes the filter and names for the portions that don't pass.
This command is different from Set Strata by Parameters because this command composites multiple strata to meet the filter instead of checking each strata individually against the filter. In Split Bed by Parameters, the composited portion that passes the filter can contain some strata that fail the filter so long as the total composite portion passes. For example, if the parameter filter is for strata attribute GRADE to be greater the 1.5, then final bed composite that passes could be made of one strata with GRADE of 1.6 plus part of another strata with GRADE 1.1such that the composite GRADE equals 1.5. The strata that make up the bed can be divided into a part that is used in the composite and part that is discarded. For example in the above case, the strata with the GRADE of 1.1 could be originally 2 feet thick. Since this strata is below the target GRADE of 1.5, it could be that only 0.7 feet of this strata could be added to the composite without bringing the composite below 1.5. So the strata would be split at 0.7 feet with the remaining 1.3 feet not becoming part of the composite.
This command can also account for minimum and maximum mining
heights to limit the composite bed thickness. If there is no
portion that meets the filter at the minimum thickness, then the
program will find the best portion. Likewise if the composite that
meets the filter exceeds the maximum height, then the program will
find the best portion with the maximum allowed thickness. The
thickness interval resolution allows the intervals to be broken up
into as small of units as required. The Find All Matching Zones
will not stop at the single best zone, it will separate the beds
into all of the matching zones.
Restrict Mining Zone is an option that defines where the program
will start calculating from, either the top or bottom. For a
surface mine, the Top Down would make the most sense, so that the
most efficient method of mining is designed. For underground, it is
possible that the Bottom-Up option is preferred, so that extra
material will be left in the roof for support.
Split Bed by Parameters dialog
Define Parameters dialog
Select the DrillHoles to process.
Select objects: pick the drillholes
Changed 42 drillholes.
Pulldown Menu Location: Drillhole > Parameter
Compliance
Keyboard Command: splitpar