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When numbers shine — and what lies behind them
“30.6 g/t Au over 1.35 meters” — headlines like this make investors’ hearts race. A junior explorer announces a drill hit from a well-known gold belt, the press release lands in your inbox, and the share price jumps. But anyone staring at the peak value alone is skipping the questions that actually matter: How wide is the mineralized interval? At what depth does it sit? And does the mineralization hold up across the broader structure, or is it a one-hole wonder?
Gold belts in Canada, Tanzania, or Brazil are already well understood geologically. Historical mining records, seismic data, and earlier drilling programs all supply context. New drill results there attract attention because the geological setting is known, so fresh discoveries can be assessed for economic relevance faster than in greenfield territory. The flip side is that the pitfalls are equally well documented.
Belts, grades, and geology — the market context
Gold belts typically form along tectonic shear zones, where hydrothermal fluids deposited gold in quartz veins. These structures often run for dozens of kilometers and host several deposit types at once — from high-grade, narrow vein mining to large-volume, low-grade systems. Drill results from the same belt can therefore look very different from one another.
Gold is also trading at historically elevated levels right now. This changes how junior explorers get financed and how majors with shrinking reserves approach acquisitions. The pressure to deliver visible results quickly is real, and it pushes some companies to lead with peak values while burying the data that would let you judge them properly.
For small-cap investors, that creates a tension: high-grade results generate short-term price speculation, while the question that actually drives long-term value — how much gold is in the ground and at what cost can it be extracted — often goes unanswered for months or years.
Four metrics that determine value
A drill result is not a single number — it is a data package. To read it properly, you need at least four parameters in front of you:
| Metric | What it means | Why it matters |
|---|---|---|
| Grade (g/t Au) | Grams of gold per tonne of rock | A high peak grade without meaningful width is often economically worthless |
| True Width | Actual width of the mineralized zone | An angled drill hole overstates the interval width; true width corrects for this |
| Depth to surface | Mining depth in meters | Near-surface occurrences significantly reduce development costs |
| Continuity | Consistency of mineralization across multiple drill holes | A single hit is not a deposit; only a pattern across multiple holes reveals structure |
Take a drill hole returning 30 g/t Au over 1.35 meters. Impressive on its face. But if that hole was drilled at a 60-degree angle to the vein structure, the actual vein thickness may be considerably narrower — perhaps only 0.8 meters. Underground mining operations typically need a vein of at least 1.5 to 2 meters to be economic, so the geometry can matter as much as the grade number itself.
Now compare that to a neighboring drill hole on the same project returning 4.25 g/t Au over 6.65 meters. Lower grade, wider interval. That combination tells you something about how the vein system is built in three dimensions: is there a steeply dipping high-grade core with a shallower, lower-grade halo around it? That geometry determines whether a project suits underground mining, open-pit, or some combination of both.
When an exploration company identifies a new, previously unknown fault structure running alongside known vein zones, that expands the potential resource base — provided follow-up holes confirm it. “Potential” deserves to be read carefully here: it is a working geological hypothesis, nothing more.
What patterns in the data mean for investors
Anyone trying to interpret drill results should get into the habit of asking a few basic questions.
Start with repeatability. Is this a first confirmation or a result that keeps showing up along a structure? A single high-grade intercept is geologically interesting. It only becomes the foundation for a resource estimate once multiple holes at varying spacings consistently return strong values.
Then check regional plausibility. The Abitibi Belt in Canada and the Lake Victoria Craton in East Africa are thoroughly mapped. Results that fall well outside the geologically expected range for those settings deserve more skepticism; results that extend existing models can be weighed with more confidence.
Look, too, at what the company actually discloses. Technical reports from competent operators state true width and drill hole azimuth explicitly. When those numbers are absent, you cannot assess the real width of the intersection. That is not a paperwork issue — a core piece of the data is simply missing.
A record quarterly revenue figure says little without margin data. Drill results work the same way: grade without width, depth, and continuity leaves you with a number you cannot properly judge.
Putting drill results in perspective
Drill results are snapshots from an ongoing geological process. High-grade, near-surface intercepts in established gold belts are worth paying attention to — they can point to real structures. But they are always one piece of a larger picture that only fills in as more holes are drilled, assayed, and compared against one another.
The market reacts to the headline first. Width, depth, and continuity arrive later, and in the end they tend to decide whether any of it was worth the excitement.
Key terms for beginners
- g/t Au (grams per tonne gold)
- The unit of measurement for gold content in rock samples. A value of 1 g/t means one tonne of rock contains an average of 1 gram of gold. Values above 5 g/t are considered high-grade on many projects.
- True Width
- The actual thickness of a mineralized zone, measured perpendicular to the vein structure. Because drill holes rarely intersect a vein at a right angle, the reported drill interval often overstates the true width.
- Mineralization
- The presence of economically interesting minerals — in this case gold — within a rock body. Continuous mineralization across multiple drill holes is a prerequisite for a resource estimate.
- NI 43-101
- The Canadian regulatory standard governing disclosure for mineral projects. It requires that technical data be reviewed and certified by an independent Qualified Person.
- Inferred Resource
- The lowest confidence category in the NI 43-101 system. Based on limited data; economic recoverability has not been demonstrated. Not to be confused with Reserves.
- Proven/Probable Reserves
- The highest classification level: economic recoverability has already been established through feasibility studies. Distinct from Resources, which describe geological potential only.
- Gold Belt
- A geographically and geologically defined zone with elevated gold density, typically along tectonic shear zones. Well-known examples include the Abitibi Belt (Canada), the Yilgarn Craton (Australia), and the Lake Victoria Craton (East Africa).
- Assay
- A laboratory analysis of rock samples to determine mineral content. Assay results are the raw basis of every published drill result and are produced by accredited laboratories.
⚠️ Important notice: This article is for informational and educational purposes only. It does not constitute investment advice, a recommendation, or a solicitation to buy or sell any security. Investments in small-cap exploration and mining companies carry a high risk, including the potential total loss of capital. Before making any investment decision, consult a registered financial advisor and conduct your own analysis. Boersen Post Team is not responsible for decisions taken based on the content published here.
