Pillar Extraction Ratio Calculator
Audit actual independently surveyed pillar extraction with missing assessment area, not repeating-cell room geometry or recommended secondary recovery. Caller independently verifies units, applicability and matching conditions; no operational recipe, safety certification, causal efficacy or legal/resource classification is inferred.
Description
Pillar extraction fraction compares surveyed removed area with original pillar area.
Pillar extraction fraction compares surveyed removed area with original pillar area.1
Unassessed original areas must remain separate from the fraction based on known observations.
When to use Pillar Extraction Ratio Calculator
Use this tool to calculate or review the supplied observations under the stated rules. Match completed survey or ledger observations by block, segment or stage and confirm their units and boundaries.
How to use Pillar Extraction Ratio Calculator and understand its results
- Match completed survey or ledger observations by block, segment or stage and confirm their units and boundaries.
- Enter observedOriginalPillarAreasM2, observedExtractedPillarAreasM2, knownPillarExtractionFlags, using the field meanings and rules below, then run the tool.
- Read knownObservedPillarExtractionFraction, unassessedOriginalPillarAreaM2. Inspect nested result fields where present, and review unknown records separately from known matches.
- Correct any reported input issue and run again. Before using a successful result, check the stated units, signs, reference scope and observation coverage.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| observedOriginalPillarAreasM2 | Observed original pillar areas m2 | list of number | Required |
| observedExtractedPillarAreasM2 | Observed extracted pillar areas m2 | list of number | Required |
| knownPillarExtractionFlags | Known pillar extraction flags; binary 1 means the matched observation is known, 0 means unknown | list of number | Required |
Use aligned original areas>0, extracted areas≥0≤original for every row, and binary known flags. Require positive total known original area. Return known extracted/known original area and the sum of unknown original areas.
knownFraction=Σ_known extracted/Σ_known original; unassessedArea=Σ_unknown original Use the matching field units and the exact boundary, ordering and reference rules above.
| Output field | Meaning | Value type |
|---|---|---|
| knownObservedPillarExtractionFraction | Known observed pillar extraction fraction; dimensionless fraction, not a percent | number |
| unassessedOriginalPillarAreaM2 | Unassessed original pillar area m2; unresolved records kept separate from known results | number |
{
"input": {
"observedOriginalPillarAreasM2": [
10,
20
],
"observedExtractedPillarAreasM2": [
2,
10
],
"knownPillarExtractionFlags": [
1,
0
]
},
"output": {
"knownObservedPillarExtractionFraction": 0.2,
"unassessedOriginalPillarAreaM2": 20
}
}Limitations and assumptions
Units, ledger boundaries, survey interpretation and model applicability must be independently established. These summaries do not assign reserve/resource classifications or establish support adequacy, ventilation safety or an operating setting.
Missing required fields, unknown fields, wrong types and violated rules return input issues. Numeric values and outputs must be finite. Lists and matrices must be dense, without missing cells. Numeric lists allow at most 10000 entries; ordinary string lists allow at most 128 strings of 128 UTF-16 units each; numeric matrices allow at most 128 rows and 128 columns, subject to narrower requirements above.
Alternative or Complementary methods
For a related step, use Ore Loss Percentage Calculator: An ore-loss fraction needs matched called and unrecovered inventory on a common basis. For a complementary comparison, use Room and Pillar Width Calculator: A repeating-cell pitch minus room width gives an equivalent residual pillar width.
References
-
Pillar Extraction Ratio Calculator — tool.io
Similar or alternative tools
- Ore Loss Percentage Calculator
An ore-loss fraction needs matched called and unrecovered inventory on a common basis.
- Room and Pillar Width Calculator
A repeating-cell pitch minus room width gives an equivalent residual pillar width.