The Lassonde Curve is a model of how a junior mining company’s share price moves through the life of a mineral project, from raw exploration ground to a working mine. Pierre Lassonde, co-founder of Franco-Nevada, described the pattern in 1990: an early speculative spike when drills confirm a discovery, a multi-year collapse while engineers and regulators do quiet technical work, and a second climb once financing closes and metal starts shipping. The full journey averages 15 to 16 years, and knowing where a company sits on the curve is the most useful filter for deciding when to buy a mining stock and when to sell it.
The Shape of the Curve
Plotted against time, the curve looks like a stretched letter M. Two peaks, one deep valley between them. Most retail investors never see the second peak because they sell in frustration during the valley, and most institutional investors never see the first peak because they won’t touch a company without a feasibility study. The gap between those two crowds is where the curve’s opportunities live.
The life of a discovery breaks into seven stages. In the concept stage, the company holds ground but hasn’t drilled; share prices are at their lowest. In pre-discovery, drill rigs are turning and speculation builds. Discovery is the moment drill holes return significant mineralization and the stock spikes. Feasibility follows, and the excitement fades as engineers replace geologists. Development begins when financing closes and construction starts. Production arrives when the mine ships metal and generates cash flow. Depletion comes at the end, as reserves run down.
Two of these stages produce the peaks. One of them produces the valley. The other four are transitions, and each transition tends to be a re-rating event in one direction or the other.
The Discovery Spike
The first peak arrives on the strength of drill results alone. There’s no feasibility study, no permit, no financing package — just a set of intercepts exciting enough to move a market cap overnight. A discovery hole reporting 100 meters of gold at several grams per ton can multiply the value of a small explorer in a single trading session.
Federal disclosure rules under S-K 1300 require an independent qualified person to sign off on any exploration data, mineral resources, or reserve estimates a public company reports.1U.S. Securities and Exchange Commission. Modernization of Property Disclosures for Mining Registrants – A Small Entity Compliance Guide Resources get classified into three tiers based on confidence: inferred, indicated, and measured. Inferred resources carry too much uncertainty to support any economic evaluation. Indicated resources have enough sampling density for preliminary mine planning. Measured resources support a detailed mine plan.2eCFR. 17 CFR 229.1300 – Item 1300 Definitions Each upgrade between tiers tends to move the share price, and every upgrade requires more drilling.
That progression, the slow conversion of inferred pounds or ounces into measured ones, is exactly the work that drains excitement from the discovery peak. The valuation at the peak reflects the most optimistic reading of early results, and that reading rarely survives contact with a real feasibility study.
The Orphan Period
The orphan period is the defining feature of the Lassonde Curve and the phase that catches investors off guard. Once the discovery holes are drilled, the pace of exciting news stops. Company spending shifts from exploration drilling, which produces headlines, to metallurgical testing, engineering studies, and environmental baseline work, which produce nothing a press release can dramatize. Speculators sell, and the share price falls into a valley that can last years.
This is the phase of feasibility work. A Preliminary Economic Assessment gives the first rough view of whether the deposit could pay for itself. A Pre-Feasibility Study and then a Definitive Feasibility Study follow, each costing millions and taking well over a year. These studies produce the internal rate of return that banks and institutional buyers use to judge the project. An IRR below roughly 15 percent tends to make financing difficult; that has been the practical floor for most major mining companies over the past decade.
The irony is that the project usually becomes more valuable, in a technical sense, as its stock price falls. Metallurgical tests prove the metal can actually be recovered from the rock. Geotechnical work confirms the pit walls or tunnels will hold. Hydrogeological studies show the water table won’t flood the operation. Risk is coming out of the project with each report, but the market doesn’t reward risk reduction the way it rewards discovery. That gap between technical progress and market sentiment is the curve’s most exploitable inefficiency.
Equity Dilution in the Valley
Feasibility work burns cash, and companies raise money at exactly the worst time: when their share price is depressed. These financings dilute existing shareholders, and they usually include warrants — rights to buy more shares at a set price later. When the stock eventually recovers, warrant holders exercise and sell into the market, creating a ceiling of supply that suppresses the price as it tries to climb.
Warrant overhang is a drag that management can’t control on any particular schedule, and a large overhang complicates future financings by forcing new issuance at prices lower than the improving fundamentals would command. For anyone evaluating a stock in the orphan period, the fully diluted share count is the number that matters, not the basic count.
Technical Failures That End Projects
Not every project survives feasibility. The most common killer is complex mineralogy: the metal is there, but it can’t be recovered economically from the host rock. Low-grade gold deposits below about one gram per ton are especially vulnerable. A project can carry huge measured resources and still fail if plant recovery runs 10 or 15 percentage points below the feasibility assumption.
Optimistic resource modeling kills others. Treating inferred material as if it were measured, or setting cut-off grades that don’t reflect real mining costs, inflates projected mine life and revenue. When a more rigorous study applies realistic dilution factors and block-by-block grade modeling, the economics can collapse. Industry data suggests roughly one in three projects that reach definitive feasibility require significant redesign during construction because the original study underestimated geology or logistics.
Why Permitting Extends the Valley
Feasibility isn’t the only thing lengthening the orphan period. In the United States, securing the full set of federal and local permits needed to break ground averages seven to ten years, and the permitting clock usually outlasts the engineering by a wide margin.
The centerpiece is the Environmental Impact Statement required under the National Environmental Policy Act. Federal regulations set a two-year target for completing an EIS, though agencies can extend that deadline in writing when a project’s complexity demands it.3eCFR. 40 CFR 1501.10 – Deadlines and Schedule for the NEPA Process Mining EIS timelines routinely exceed the target because baseline studies on water, wildlife, air, and cultural resources begin years before the formal process starts. The EIS ends with a Record of Decision that explains the agency’s choice, the alternatives considered, and any required mitigation.4US EPA. National Environmental Policy Act Review Process Securing that Record of Decision is one of the most significant de-risking events on the curve, because it removes the possibility that regulators simply block the project.
Projects that touch wetlands or streams also need a Section 404 permit from the U.S. Army Corps of Engineers under the Clean Water Act, and applicants must show they’ve avoided impacts where possible, minimized what remains, and will compensate for anything unavoidable.5US EPA. Permit Program under CWA Section 404 Where lands carry cultural significance to Native American communities, Section 106 of the National Historic Preservation Act requires meaningful consultation with tribal nations before any decision.6Bureau of Land Management. Cultural Resources – Tribal Consultation Incomplete consultation is a common ground for legal challenges that delay construction.
For an investor watching the curve, permit milestones are re-rating events. A completed EIS, a favorable Record of Decision, or an issued 404 permit each takes a category of risk off the table and pulls a new class of buyer into the stock.
The Second Peak: From Financing to Production
With permits in hand, the company still needs project financing to cover construction costs that run into the hundreds of millions or billions depending on scale. Financing packages typically combine syndicated bank loans with equity raises, and lenders require reclamation bonds guaranteeing the land will be restored when mining ends. The Final Investment Decision, the board’s formal commitment to build, is the main trigger for the stock’s second ascent.
Construction brings its own risks: cost overruns, schedule slippage, and the possibility that commodity prices fall before the first shipment. But for investors who bought during the orphan period, this is where the thesis starts paying off. Each construction milestone, from processing plant foundations to tailings facility completion to electrical energization, de-risks the project further and pulls in more buyers.
The second peak arrives when the mine reaches commercial production and generates actual cash flow. Analysts shift from net asset value models built on assumptions to earnings multiples built on operating data. Major mining companies also evaluate producing operations as acquisition targets at this stage, which can deliver a premium exit. Once the peak passes, what remains is a producing asset with a finite mine life heading toward depletion.
How Commodity Prices Bend the Curve
The Lassonde Curve maps project milestones, but real share prices don’t move on milestones alone. The price of the underlying metal acts as a multiplier or a suppressor at every stage. A company sitting in the orphan period during a bull market for its commodity may never experience the full depth of the valuation dip, because a rising metal price makes the future mine more valuable even without new permits or financing.
The reverse is more painful. A project that clears every technical hurdle and holds every permit can still see its stock collapse if the commodity falls far enough to make the economics marginal. Feasibility studies rest on price assumptions, and when the market drops below those assumptions, the projected IRR drops with it, sometimes below the threshold where lenders will participate. Using the curve as a timing tool requires layering a commodity price view on top of the milestone analysis. The curve tells you where the project is. The commodity price tells you whether the market cares.
Timing Your Entries and Exits
The curve creates two natural buying windows and two natural selling points. How you use them depends on whether you’re a speculator hunting discoveries or a value investor looking for mispriced projects in the valley.
Pre-Discovery Buying
Buying in the concept or pre-discovery stage is a pure bet on geological success. Most exploration programs fail, so the odds are against you, but a genuine discovery can return multiples of your entry price. Due diligence at this stage is almost entirely geological: the quality of the exploration targets, the track record of the technical team, and whether the ground looks similar to known deposits nearby. Share prices are typically measured in pennies.
Selling the Discovery Peak
Selling into discovery euphoria captures the speculative premium before feasibility work resets expectations. It’s the classic buy-the-rumor, sell-the-news trade for mining, and it avoids the years of dead money in the orphan period. The trade-off is giving up any share of the second peak.
Late Orphan Period Buying
The deeper value opportunity sits at the bottom of the orphan period, when a stock trades at a fraction of its discovery peak even though the project is technically more advanced. The best candidate has completed a feasibility study showing a solid IRR, has a clear permitting pathway, and is approaching a financing decision. Risk is lower than pre-discovery buying, but patience is required — the timeline from here to production can still stretch several years.
Exiting at Production or Acquisition
The final exit is commercial production or a takeover bid from a major. At this point the market prices the company on operating metrics, and the structural revaluation the curve describes is complete. Holding past this point is a bet on execution, commodity prices, and reserve replacement, not on the curve itself.
The Year-End Discount
Junior miners are small, volatile, and heavily held by retail investors, which makes them particularly exposed to year-end tax-loss selling. Investors dump losing positions in November and December to realize capital losses, pushing depressed orphan-period stocks even lower. Research has shown that nearly half of the annual small-stock premium occurs in January, with more than half of that January effect landing in the first trading week. For an investor targeting an orphan-period entry, late December often prices better than the same stock a month later.
Tax Treatment When You Sell
Two provisions of the Internal Revenue Code matter for mining investors, and one of them is a trap that catches people who assume small-company stock always qualifies for favorable treatment.
Section 1202 Does Not Cover Mining
Section 1202 lets investors in qualifying small businesses exclude a portion of their capital gains from federal tax, up to 100 percent in some cases. The statute explicitly excludes any business involving the production or extraction of products eligible for a percentage depletion deduction, which covers essentially every mining operation.7Office of the Law Revision Counsel. 26 USC 1202 – Partial Exclusion for Gain from Certain Small Business Stock Gains on mining stocks are taxed at standard capital gains rates, regardless of company size.
Section 1244 Losses Can Offset Ordinary Income
The more useful provision for mining investors is Section 1244, which applies when the investment fails — and in junior mining, that happens often. Qualifying Section 1244 stock lets you deduct a loss as an ordinary loss rather than a capital loss. That matters because ordinary losses offset any income, while capital losses only offset capital gains plus $3,000 of ordinary income per year.
The annual ordinary-loss cap is $50,000 for individual filers and $100,000 for joint returns. To qualify, the corporation must have received no more than $1 million in total capital contributions at the time the stock was issued, and you must have acquired the stock directly from the company for cash or property rather than on the secondary market.8Office of the Law Revision Counsel. 26 USC 1244 – Losses on Small Business Stock The company also must have earned more than half its gross receipts from active business operations rather than passive sources like royalties, rents, or investment income during the five tax years before the loss. For a junior explorer spending money on drilling rather than earning royalties, that active-income test is usually easy to meet. Any loss above the annual cap gets treated as an ordinary capital loss.