The Math Acquirers Will Eventually Have to Use
There is one calculation every gold producer eventually has to run. When they run it honestly, $93 an ounce does not survive it.
The Question on the Corp-Dev Desk
Start where the decision actually gets made.
Inside every major gold producer there is a corporate development team (corp-dev, for short) responsible for acquisitions and reserve strategy. Every year that team faces one unavoidable question. The company mined and sold several million ounces of gold this year. How do those ounces get replaced, so the company is at least the same size next year?
There are only two answers. Find the ounces, or buy them. Drill, or acquire. This article walks the arithmetic of that choice the way corp-dev has to walk it, because arithmetic, not sentiment, is what eventually sets the price of a pre-production gold ounce.
Previously in The Gold Grid: the last issue established that two truths run through this market and only one of them is priced. The supply shortage everyone sees, and underneath it, a mispricing nobody has put a number on. Acquirers pay roughly $93 per ounce USD for pre-production gold against a margin-justified value of $729 per ounce USD: 87.2% compression. That issue showed that the Gap exists. This one shows the math that closes it.
One note before any number appears. Every figure here uses a gold price of $5,000 per ounce USD. That is the Gold Grid screening price: a fixed assumption I hold constant so every company is measured on the same basis, every issue, regardless of where gold trades that week. It is not a spot quote and it is not a forecast. It is a measuring stick. Nothing here depends on gold sitting at $5,000; it depends on a relationship between two numbers, and that relationship holds at any price you choose.
The Depletion Side
Step one is the depletion side of the equation, and it is not in dispute.
A producer’s reserve base changes every year by a simple equation. Start with last year’s proven and probable reserves: “P&P,” the gold that is economically mineable and permitted, the most conservative reserve category there is. Subtract what was mined. Add what was genuinely added. The ratio of those last two numbers (ounces added divided by ounces mined) is the replacement ratio, and it is the single most useful number for reading a producer’s position.
Above 1.0×, the company is replacing everything it mines and the base is growing. Below 1.0×, the base is shrinking. Below 0.5×, it is shrinking fast.
Run it on the largest gold producer in the world. Newmont’s P&P gold reserves fell from 134.1 million ounces at year-end 2024 to 118.2 million ounces at year-end 2025 (Newmont 2025 Mineral Reserves Release, February 2026). Mining depletion that year was 7.2 million ounces. Reserve additions were 2.0 million ounces. And here a distinction matters. Those 2.0 million ounces were resource-to-reserve reclassifications: ounces already known, now upgraded into the reserve category, primarily at Brucejack and Lihir. They were not new discoveries. Nothing was found. The drill bit added nothing to the count.
So Newmont’s replacement ratio was 2.0 divided by 7.2, or 0.28×. For every ounce it mined, it replaced barely more than a quarter, and none of that quarter came from exploration.
Newmont is not the exception. Across the top twenty gold producers, proven and probable reserves fell 26% between 2012 and 2017, from 967 million ounces to 713 million (McKinsey). That window is the last period for which a comprehensive multi-year industry dataset exists. What has happened since shows up one company at a time, and it points the same way: Newmont’s own reserves, as the figures above show, fell by nearly 16 million ounces in the single year from 2024 to 2025. The industry’s replacement ratio has sat below 1.0× for more than a decade. The depletion side of the equation is not a historical artifact. It is the standing condition, and it has been settled for years.
Which moves the whole question onto the other number. If the ounces have to be replaced (and a steadily shrinking company is not a plan a board signs off on), then the only open question is what replacement costs.
Above: the depletion side of the equation, why every major’s reserve base is shrinking, and the one ratio that measures it. Below: what it costs to replace an ounce by drilling versus by buying, why a roughly sixteen-year clock makes the choice forcing rather than optional, and what finally breaks the $93 price. Founding Member access opens August 3. Subscribe free now to read the rest and hold your place in line.
The Cost of Replacement
Replacement comes two ways, and corp-dev has to weigh both.
Start with drilling: replacing reserves the way the textbook says, by finding them. The industry spent about $5.55 billion USD on gold exploration in 2024 (S&P Global). For that spending, the number of major gold discoveries (deposits of two million ounces or more) was zero. It has been zero in recent years. The real problem with the drilling route is not that drilling is expensive. It is that drilling is unreliable. Billions of dollars of industry exploration spending, year after year, has not produced a single deposit at the scale a major needs to move its reserve base. A corp-dev team cannot build a replacement plan around a process that, at the scale that matters, has lately delivered nothing.
That is the drilling route. Now the other one.
A producer can acquire a junior that has already drilled the ounces and carried them to a defined resource. That route has a price, and the price is observable. It is the Core Median: $93 per ounce USD, measured across eleven pre-production gold acquisitions in tier-one jurisdictions over the most recent five years.
Set the two routes side by side the way corp-dev has to. Drilling: unreliable, and on a timeline measured in decades even when it works. Buying: $93 an ounce, available now, already drilled, already defined. It is not a close call. Acquisition is not merely the cheaper way for a major to add gold to its balance sheet: it is the route that reliably works at all.
And here is the part worth sitting with. Recall the margin arithmetic from the last issue. At the $5,000 per ounce USD screening price, against an industry-standard $1,700 per ounce USD all-in sustaining cost (AISC, the cash cost of producing an ounce), every ounce carries $3,300 USD of gross operating margin. The historical capture rate says an acquirer should pay 22.1% of that margin for a pre-production ounce: $3,300 × 22.1% = $729 USD. They are paying $93. They are buying the one replacement route that reliably works, and they are buying it at 12.8% of what the margin justifies. The route a producer cannot do without is also the one priced furthest below its worth. That is not a stable arrangement.
A note on the margin figure: the benchmark uses gross operating margin: gold price minus AISC. AISC is the World Gold Council standard and includes mine-site royalties and taxes per ounce sold. Net cash flow to equity varies by project structure; Impact-Benefit Agreement (IBA) / First Nations participation, sustaining capital, and corporate taxes are project-specific.
Why “Eventually” Has a Clock
A cost comparison alone would only tell a producer what is cheaper. It would not tell them when. The word in the title is eventually, and eventually has a clock.
Two numbers set it. The first is reserve life: how many years a producer can keep mining before the reserve base is gone, at the current rate. Newmont’s 118.2 million ounces of reserves against 7.2 million ounces of annual depletion is a reserve life of about sixteen years. Barrick carries 89 million ounces against roughly 4.6 million ounces of annual depletion, about nineteen years. The best-supplied majors are looking at reserve lives in the high teens, and that figure shrinks every year the replacement ratio sits below 1.0×.
The second number is the lag. The average time from discovery to production is roughly sixteen years (S&P Global). A deposit found today does not pour gold until the 2040s.
Set those two numbers side by side and the clock becomes visible. A major’s reserve life and the discovery-to-production lag are the same number: roughly sixteen years. Suppose a producer started a greenfield exploration program today to fix its own depletion. Two things can go wrong, and the discovery record says at least one of them will. It may find nothing of consequence (on the evidence of the last decade of industry spending, the most likely outcome by far). Or it may beat those odds and find a genuine tier-one deposit, in which case the gold arrives roughly sixteen years out, at about the moment the reserves it was meant to replace have already run dry. A find-risk and a timing problem, stacked one on the other. For a producer that has to replace ounces on a deadline, exploration is not something it can rely on.
That timeline does something specific: it dictates the kind of company an acquirer can use. A producer that needs gold in production on a near-term horizon (well inside its own reserve-life window) cannot buy a grassroots explorer. There is no version of the timeline where that works. The math forces the buyer toward a particular profile: ounces already drilled and defined, at a grade that survives a real cost structure, far enough along the development path to reach production inside the reserve-life window, in a jurisdiction an acquirer’s technical and legal teams will accept. The clock does not just say buy. It says buy this kind of company, and there are not many of them.
Which raises the obvious question. Which juniors actually fit that profile, and how would you measure that against a benchmark, rather than guess? That is not a question this article can answer. But it is the exact question the next one is built around.
What Breaks the $93 Equilibrium
If the math is this clear, why is anyone still paying $93?
Because the math being clear is not yet the same as the math being urgent. Today, $93 per ounce USD holds for one reason: the supply of cheap, well-drilled junior targets has not run out. A producer that needs ounces can still find a junior priced near $93 and buy it. As long as that remains true, there is no pressure to pay more.
That is what eventually depends on. The producers buy, and they buy the best targets first. But “best” here is two things, not one, and the distinction matters. One is how good the rock is: grade, ounce count, jurisdiction. The other is how far along the project is: a defined resource, study work done, a clear path to production. A major buys where those two overlap. A high-quality deposit that is still early (years of development work ahead of it) does not fit the sixteen-year clock from the last section, however good the rock. It is not disqualified; it is simply not ready yet. So the pool that actually depletes first is not “good juniors” in general. It is the narrower set that is good and advanced enough to reach production inside an acquirer’s window: a smaller pool to begin with, which means it drains faster.
The cheapest junior in that set goes, then the next, then the one after. Every acquisition removes one target from a pool that does not refill, because the discovery data says nothing is being added to it. Meanwhile every producer on a sub-1.0× replacement ratio is working from the same shrinking list at the same time. A shrinking pool of targets and a fixed-or-growing number of buyers has one outcome. The marginal price rises. The bid moves off $93 and toward what the margin actually justifies. The compression unwinds, not because sentiment changed, but because the cheap inventory was consumed.
It is worth stating the strongest case against this. Barrick has reported reserve replacement above 180% for four consecutive years, on its face a producer the depletion argument does not fit. But look at what “reserve replacement” actually counts. Ounces are added to a reserve base by more than discovery: acquisitions add to it, and so does resource-to-reserve conversion of ounces already known. A replacement rate above 180% says a company stayed ahead of its depletion across all of those routes together. It does not say the drill bit did the work. (Barrick also books its reserves against a conservative $1,400 per ounce USD price assumption, held well below the market, a cautious internal benchmark, not a market-priced one.) A producer that stays ahead of depletion by buying and converting is not the exception to this thesis. It is the thesis.
None of this is a forecast. It is a description of what a fixed quantity does when it is consumed and not replaced.
And here is the one thing this analysis cannot tell you: the date. The pressure is structural and the direction is not in doubt, but when the bid moves off $93 depends on the pace of deals, the gold price, and the balance sheets of a dozen producers, none of which runs on a schedule. It could begin to move this year. It could hold for another three. An honest reading of the math gives you the direction and the mechanism. It does not give you the timing, and any analysis that claims to put a date on it is selling something the data cannot support. The discipline this calls for is not predicting the date. It is being positioned before it.
The Receipt
One piece of evidence, and then I’ll stop. The full version belongs in a later issue.
The framework I have built scores junior gold companies against exactly the acquirer profile this article has described. In April 2025 it scored one company, Northern Superior Resources, at 78 out of 100, two points short of the 80-point line I reserve for the top tier, close enough to flag it and watch. At the time, the market valued its gold in the ground at roughly US$22 per ounce, a 76% discount to what acquirers pay. Six months later, in October 2025, IAMGOLD acquired it, at roughly US$89 per ounce of resource. The ounces re-rated 4.0×, carrying them within a few dollars of the $93 Core Median this article has been circling.
The score was recorded and dated before the acquisition, not explained after it, while Northern Superior was still priced like every other pre-production junior, before the bid arrived to prove the math.
How the system works (the five pillars, the hundred points, the methodology in full) is the subject of the next issue.
What Comes Next
So the macro case is complete. Producers are depleting their reserves, and they cannot drill the replacement into existence in time. Acquisition is the only option that works, and today it clears at a price the margin cannot justify for long. The Gap is not a market opinion. It is arithmetic with a clock on it.
That leaves one question, and it is the practical one. If the producers will eventually have to buy, which juniors are positioned to be bought, and how do you measure that before the bid arrives, instead of after?
Next week, I’ll show you the system that answers it: five pillars, one hundred points, the full methodology, made public.
Until then, read the reserve reports. They come out every February and March, and the replacement ratio is right there for anyone willing to divide one number by another.
Pull up the latest annual reserves report for a gold producer you follow, the mineral reserves statement, issued each winter. Did its proven and probable reserves grow or shrink last year? And of any growth, how much came from the drill bit versus from acquisitions and resource conversions? Tell me what you found.
The Gold Grid ranks a curated set of junior gold explorers on what acquirers actually look for. Founding Member access opens August 3: 100 seats.
Alain Gilbert, B.Eng. is the founder of Gilbert Analytics and author of The Gold Grid: independent, engineering-grade analysis of junior gold M&A. Full publication for investors at gilbertanalytics.substack.com. Research and methodology for CEOs and corporate development teams at gilbertanalytics.com.
This analysis does not constitute investment advice. The author holds positions in publicly traded junior gold companies.
Gilbert Analytics produces independent analysis of the junior gold mining sector. New to The Gold Grid? Start with Mind the Gold Gap (the framework) and What Acquirers Pay (the methodology) at gilbertanalytics.substack.com.
The Gold Gap Index is a macro indicator based on publicly available M&A transaction data. It does not constitute investment advice.
Disclosure
The author, Alain Gilbert, holds positions in publicly traded junior gold companies. The author may also hold positions in other publicly traded companies discussed in this publication. All material positions are disclosed when relevant. This analysis does not constitute individual investment advice and is not designed to meet your personal financial situation or needs. The author is not a licensed financial analyst, registered broker-dealer, or investment adviser, and is not registered with the U.S. Securities and Exchange Commission, any state securities regulatory authority, or any self-regulatory organization. Never make an investment based solely on what you read in an online newsletter.
Results Not Typical. Any historical performance data published by Gilbert Analytics, including the Gap Benchmark, reflects past market outcomes and is not indicative of future results. Gilbert Analytics does not track or verify subscriber trading results. Actual outcomes will vary widely based on individual decisions, risk tolerance, experience, and market conditions. Investing in junior mining companies is speculative and carries a high degree of risk. You may lose some, all, or possibly more than your original investment. You are solely responsible for your own investment decisions. Always consult a licensed or registered financial professional before making any investment decision.
Alain Gilbert, B.Eng., is the founder of Gilbert Analytics.
Full disclosures at gilbertanalytics.substack.com/about