Whittle Pit Optimization Factor Calculator

Generate Whittle-style supplied block economic sensitivity weights across explicit revenue factors, no pit closure, precedences or optimized shell claim. Safe integer minor units in one caller currency, each input at most 1e12; integer factor basis points 0–1000000, 10000=1. Exact BigInt scaled revenue rounds once to nearest minor unit, ties away from zero, then subtracts exact block cost. Signed losses retained. No resource classification or financial forecast assurance.

Description

Revenue factors are sensitivity assumptions applied to recovered block revenues.

Revenue factors are sensitivity assumptions applied to recovered block revenues.^[1]

This tool produces a factor-by-block matrix of signed net values for supplied blocks.

When to use Whittle Pit Optimization Factor 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 Whittle Pit Optimization Factor Calculator and understand its results

Match completed survey or ledger observations by block, segment or stage and confirm their units and boundaries.
Enter callerBaseRecoveredRevenuePerBlockMinor, callerFixedBlockCostsMinor, callerWhittleRevenueFactorBasisPoints, using the field meanings and rules below, then run the tool.
Read scaledBlockNetValuesMinor. 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
callerBaseRecoveredRevenuePerBlockMinor	Caller base recovered revenue per block minor	list of number	Required
callerFixedBlockCostsMinor	Caller fixed block costs minor	list of number	Required
callerWhittleRevenueFactorBasisPoints	Caller whittle revenue factor basis points	list of number	Required

Use aligned nonnegative safe-integer revenue/cost minor-unit amounts≤1e12 in one currency. Use safe-integer factor basis points 0..1000000, where 10000=1. Allow at most 128 blocks and 128 factors. Multiply revenue×factor exactly with BigInt, divide by 10000, round once to nearest minor unit with half ties away from zero, and subtract cost. Return rows in factor order and columns in block order. No pit closure or precedence optimization is performed.

net_fi=roundHalfAway(revenue_i×factor_f/10000)−cost_i

Use the matching field units and the exact boundary, ordering and reference rules above.

Output field	Meaning	Value type
scaledBlockNetValuesMinor	Scaled block net values minor	numeric matrix

json

{
  "input": {
    "callerBaseRecoveredRevenuePerBlockMinor": [
      10,
      20
    ],
    "callerFixedBlockCostsMinor": [
      5,
      15
    ],
    "callerWhittleRevenueFactorBasisPoints": [
      5000,
      10000
    ]
  },
  "output": {
    "scaledBlockNetValuesMinor": [
      [
        0,
        -5
      ],
      [
        5,
        5
      ]
    ]
  }
}

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 Marginal Stripping Ratio Calculator: A marginal-stage stripping comparison needs matching current and previous waste and ore inventories. For a complementary comparison, use Total Ore Reserve Calculator: A reserve inventory summary needs nonduplicate blocks with classifications already assigned independently.

References

Whittle Pit Optimization Factor Calculator — tool.io

Similar or alternative tools

Marginal Stripping Ratio Calculator
A marginal-stage stripping comparison needs matching current and previous waste and ore inventories.
Total Ore Reserve Calculator
A reserve inventory summary needs nonduplicate blocks with classifications already assigned independently.