Gold Mine Working Capital: Why Inventory Can Absorb Cash

A gold mine can report an accounting profit while generating less operating cash than investors expect. One common reason is working capital: cash may be tied up in supplies, ore stockpiles, gold moving through the recovery circuit, doré awaiting sale, or receivables awaiting settlement. Understanding those balances helps investors distinguish normal operating timing from a developing liquidity problem.

Excavator operating in an open pit illustrating mine inventory and working capital — Illustrative mining image; not a GBDS property, inventory balance, or evidence of project conditions. Photo by Abdul Basit on Unsplash.

What Sits in Mining Working Capital?

Mining working capital is broader than finished metal. It can include fuel, reagents, explosives, replacement parts and other operating supplies; ore stockpiles and material on leach pads; gold in circuit; doré or concentrate awaiting shipment or final settlement; trade and tax receivables; and accounts payable or accrued expenses. Some stockpiles may be classified as non-current when processing is not expected within the normal operating cycle, so a current ratio can miss economically important material.

Why Production Growth Can Consume Cash

Ramp-ups often require extra spares and reagents before throughput stabilizes. Heap-leach operations can incur mining and processing costs well before recovered metal is sold. Shipments may also precede provisional or final settlement. Higher metal prices can increase the dollar value of inventory and receivables even when physical volumes are unchanged.

Payables can offset part of that cash use, but rising payables are not automatically positive. They may reflect ordinary purchasing terms, or they may indicate delayed payments to contractors and suppliers. Investors should examine the movement by category instead of treating every working-capital increase or decrease alike.

A Current Filing Example

As an external example—not a GBDS project fact—Newmont’s quarterly SEC filing for September 30, 2026 reported $1.587 billion of inventories and $1.313 billion of current stockpiles and ore on leach pads. Its nine-month cash-flow statement showed a $455 million use of operating cash associated with changes in inventories, stockpiles and ore on leach pads. The company’s June 30, 2026 filing had reported a $283 million six-month use for the same cash-flow line.

A negative adjustment does not by itself prove operational weakness. It may reflect deliberate inventory or leach-pad buildup. The key is whether management reconciles the movement to production, recovery, sales timing and the mine plan—and whether liquidity remains adequate while cash is tied up.

Hypothetical Cash-Flow Example

Hypothetical example: Suppose an operator spends $30 million building supplies, adds $18 million of ore and gold in circuit, and records a $12 million increase in receivables, while payables rise by $10 million. The net working-capital cash use is $50 million: $30 million plus $18 million plus $12 million, less the $10 million payable increase.

If the same operator reports $90 million of EBITDA and $25 million of capital spending, a simplified view might suggest $65 million before tax, interest and other items. After the $50 million working-capital use, only $15 million remains. This illustration is intentionally simplified; actual cash flow also depends on taxes, interest, reclamation spending, financing and other adjustments.

Questions for Investor Due Diligence

Which inventory categories are growing, and why?
Are stockpile grades, recovery assumptions and processing dates disclosed?
How long do sales and final settlements take?
Are supplies slow-moving, obsolete or subject to write-downs?
Are payables rising faster than production or operating costs?
Does the company have enough cash and available credit for the next operating cycle?

Working capital is neither automatically good nor bad. It is a timing bridge between spending, production and collection. Investors should connect balance-sheet movements to operational evidence and liquidity, rather than assuming reported earnings will convert to cash on the same schedule.

Educational disclaimer: This article is for general information only and is not investment, legal or tax advice. Mining investments involve geological, operational, commodity-price, financing, environmental and jurisdictional risks. Review current technical reports and regulatory filings and consult qualified advisers before making an investment decision.