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Diamond and gemstone mine financial model, built free.

A three-statement Excel model for a diamond and gemstone miner, built from your own figures and checked to balance.

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We use generative AI in parts of our process, so mistakes can occur. Every model should be checked by a person before it is relied on. Read more

The business

Mines kimberlite or alluvial deposits for diamonds (or coloured gemstones), recovering carats that are sold in periodic tenders or auctions at prices per carat set by size and quality.

See the sampleHow the model works

In short

  • 01

    Three linked statements

    Income statement, balance sheet and cash flow, linked in every period.

  • 02

    Valued two ways

    Discounted cash flow and net asset value, side by side.

  • 03

    Monthly to annual

    Monthly, quarterly, half-yearly or annual periods, for up to 30 years.

  • 04

    Checked every period

    A Checks sheet shows the balance sheet balances and the cash reconciles.

The sample

The sample, as Excel draws it.

Built by the same system and checks as yours, on illustrative figures: every sheet as Excel draws it, or live.

Annual · 10 years · Low detail
Diamond and gemstone mine sample model.xlsx
The Summary sheet of the sample diamond and gemstone mine model

Illustrative figures: the sample describes no real business. The live preview shows values; your model’s Excel file has every formula.

How it works

How the model works for a diamond and gemstone mine.

  1. How it earns revenue2 formulas
    Sales and realised prices · All mines
    Gold salesHedged salesSpot sales
    Sales and realised prices · All mines
    Gold spot priceGold spot price, last periodAnnual gold price change1 in the first period of each year
  2. What drives its costs3 formulas
    Stockpiles and metal inventories · All mines
    Ore stockpile at costStockpile value at period startCost of ore addedCost of ore drawn (at average cost)
    Stockpiles and metal inventories · All mines
    Costs deferred to the stockpile (released if negative)Cost of ore addedCost of ore drawn (at average cost)
    Stockpiles and metal inventories · All mines
    Ore stockpile at period endOre stockpile at period startOre mined (direct feed to the mill)from mining and processingOre processed (drawn from the stockpile)
  3. What it invests in3 formulas
    Mine assets and depreciation · All mines
    Mine capital expenditureMine development capexfrom development and first productionSustaining capexGrowth capex
    Mine assets and depreciation · All mines
    Depreciation and amortisation (units of production)Opening net book valueMine capital expenditureShare of remaining reserves mined
    Mine assets and depreciation · All mines
    Closing net book valueOpening net book valueMine capital expenditureDepreciation and amortisation (units of production)
  4. How it is funded3 formulas
    Debt
    RepaymentsScheduled repaymentsPrepayments from an equity raise and the cash sweep
    Debt
    Closing balanceOpening balanceDrawdownsRepayments
    Debt
    Interest expenseOpening balanceAll-in interest rateshare of the year
  5. How profit becomes cash3 formulas
    Working capital
    Trade receivablesRevenuefrom statementsDebtor daysDays in period
    Working capital
    InventoryDirect costs (positive)from statementsInventory daysDays in period
    Working capital
    Trade payablesCash operating costs (positive)from statementsCreditor daysDays in period
What it covers

23 parts, each one tested.

Every part is a tested building block with its own checks: yours is put together from the ones your business needs.

  • CPI forecastConsensus curve with long-run anchor
  • Exchange rate (US dollar)Exchange rate by financial year
  • Corporate costsFixed cost base indexed to CPI
  • Working capitalFull working capital
  • Income taxCorporate rate with tax losses
  • DebtAmortising term loan
  • Equity raisingDistribution reinvestment plan
  • Dividends and distributionsPayout of net profit
  • Discounted cash flow valuationDCF on free cash flow to the firm
  • Net asset valueBook net asset value
  • Group unit costs (single-product portfolios)C1, C2 and C3 cost per poundGroup unit costs, realised prices and margins that investors use to compare miners. Only meaningful when every mine sells the same product.
  • Exploration expenditureMetres drilled × cost per metreExploration and evaluation spend, how much is capitalised or expensed, and write-offs.
  • Key-metric summaryLast-twelve-month and run-rate metrics
  • Discount rate (WACC)CAPM at target gearing
  • Stockpiles and metal inventoriesOre stockpile at average costOre stockpiles, metal in circuit and on leach pads, and finished product held at cost; the movement adjusts cost of sales.
  • Mine registerMine register with resource conversionThe facts every other part of the model builds on — mineable inventory (reserves plus any converted resources), carrying value and mine life.
  • Development and first productionInitial capex to first production, then ramp-upPre-production construction capex, first production date and ramp-up to nameplate for new mines and expansions. Development capex feeds the asset base (and so PP&E and investing cash flow).
  • Mining and processingMill throughput × grade × recovery (gold)The physical chain from ore and waste mined, through plant throughput, head grade and recovery, to payable product (in units of the mine's own product: ounces, tonnes, dry metric tonnes, pounds) and the reserves remaining.
  • Sales and realised pricesPartly hedged gold sales (hedge book at a fixed price)Product sold × realised price, including hedging, offtake terms, quality adjustments and smelter charges. Units sold and prices are per unit of the mine's own product; the market price (spot, or FOB for bulk commodities) is the royalty value basis.
  • RoyaltiesHybrid royalty (greater of ad valorem and profit-based)Government royalties, third-party royalties and community payments on each mine's production.
  • Site operating costsUnit rates (mining $/t, processing $/t, fixed site G&A)Mining, processing, site administration and (for bulk commodities) rail, port and shipping costs.
  • Mine assets and depreciationUnits-of-production depreciation on ore reservesSustaining and growth capex (including capitalised stripping and underground development) and depreciation of mine properties and plant.
  • Rehabilitation and closureClosure cost built up over the ore reservesThe rehabilitation and closure provision — build-up or unwinding, progressive rehabilitation spend and final closure. Build-up is an operating charge (direct costs); the unwinding of discount is a non-cash finance cost.
Key numbers

The numbers it tracks.

  1. 01tonnes treated
  2. 02grade (carats per hundred tonnes)
  3. 03carats recovered
  4. 04price per carat
  5. 05cost per tonne treated
  6. 06EBITDA
Used for

What it is used for.

Also used for
  • Scenarios and sensitivities
Related models

More in producing mines.

Every mining and resources model

Looking for a diamond and gemstone mine financial model template? Ours arrives built for your business, with your figures in it.

See a finished model, sheet by sheet

The sample is built on illustrative figures and describes no real business. Models are calculations prepared from the information you provide. They are not financial advice and must be independently verified. See our terms.