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The stages of mineral exploration, explained

Last updated: November 2026

The stages of mineral exploration run from target generation and surface sampling, through discovery, expansion and confirmation drilling, to a maiden mineral resource estimate and then economic studies. The Basin Gulch property of Lannister Mining has more than 320 historical drill holes and is working toward its maiden resource.

What are the stages of mineral exploration?

Mineral exploration is a sequence of steps, each one designed to reduce uncertainty before more money is spent. Early stages are cheap and broad; later stages are expensive and focused. Most projects stop somewhere along the way, which is why reaching a compliant resource is a meaningful milestone.

Exploration for gold, step by step

  1. Target generation

    Geologists study maps, historical records and regional geology to pick ground worth claiming.

  2. Surface exploration

    Mapping, rock and soil sampling, trenching and geophysics narrow down where mineralization may sit.

  3. Discovery drilling

    First drill holes test whether surface signs continue underground and at what grade.

  4. Expansion and confirmation drilling

    More holes extend known mineralization and confirm earlier results with modern methods.

  5. Maiden mineral resource estimate

    A qualified person estimates tonnes and grade under a reporting standard such as NI 43-101 or S-K 1300.

  6. Economic studies and development

    Studies test whether a mine could be built profitably, followed by permitting, financing and construction.

Lannister Mining: where Basin Gulch sits in the stages of mineral exploration
StageBasin Gulch status
Target generationComplete: property consolidated in the Philipsburg Mining District
Surface explorationHistorical trenching completed, with gold and silver results
Discovery drillingComplete: more than 320 historical drill holes
Expansion and confirmation drillingPlanned next step on historical intercepts and new targets
Maiden mineral resource estimateThe company goal
Economic studies and developmentFuture, after a resource is defined

Why the maiden resource matters

A maiden mineral resource estimate is the first formal statement of how much mineralized rock a property holds and at what grade. It turns drill results into a figure investors and partners can compare. Lannister Mining states there is a clear premium in the market for NI 43-101 and S-K 1300 compliant gold and silver ounces in the USA.

What historical drilling changes

Starting with an existing record of more than 320 drill holes means the work at Basin Gulch can focus on confirming and expanding known mineralization rather than searching from scratch. Historical data still has to be verified before it can support a current resource.

See the Basin Gulch drill highlights

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Common questions

See all questions in the Lannister Mining FAQ
What is mineral exploration?
Mineral exploration is the process of finding, testing and measuring deposits of metals or minerals that could one day be mined. It moves from mapping and sampling, to drilling, to formal resource estimates and technical studies. Most exploration projects never become mines, which is why each stage builds evidence step by step.
What are the stages of mineral exploration?
The stages of mineral exploration usually run from target generation, to surface sampling and mapping, to discovery drilling, to expansion and confirmation drilling, to a maiden mineral resource estimate, and then to economic studies. Basin Gulch has extensive historical drilling and is working toward its maiden resource.
Mining companies conduct mineral exploration to do what?
Mining companies conduct mineral exploration to find and define deposits that could be mined economically. Exploration replaces reserves a producer mines out, and for a junior explorer it creates value by turning a property with promising results into a defined resource that investors and partners can assess.
How is gold found in exploration?
Gold is usually found through geological mapping, rock and soil sampling, trenching, geophysics and, above all, drilling. Drill core is assayed to measure grade. At Basin Gulch, more than 320 historical drill holes and trenching have already outlined near-surface gold and silver mineralization.
How long does mineral exploration take?
Mineral exploration commonly takes years, and moving from discovery to production can take a decade or more depending on the project, permitting and financing. Timelines vary widely, so the best guide for any specific project is the company own disclosure and technical reports.
What are NI 43-101 and S-K 1300?
NI 43-101 is the Canadian standard for disclosing scientific and technical information on mineral projects, and S-K 1300 is the US Securities and Exchange Commission standard for mining property disclosure. Lannister Mining states that the market places a premium on gold and silver ounces in the USA reported under these standards.