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Stages of mineral explorationPublished by Lannister MiningLast updated:

The stages of mineral exploration, from first sample to resource estimate

Mineral exploration moves in stages, and each stage decides whether a project earns the next round of work.

At the Basin Gulch Property, Lannister Mining has already passed the early stages: the property sits in a historic district, trenching returned gold and silver, and more than 320 historical holes have been drilled. The next stage for Lannister Mining is resource definition, leading to a maiden mineral resource estimate.

What are the stages of mineral exploration?

Mineral exploration usually moves through five broad stages: target generation, sampling and mapping, discovery drilling, resource definition, and economic studies. Each stage reduces uncertainty and usually costs more than the one before. Basin Gulch sits between historical discovery drilling and resource definition.

Procedure

The five stages, step by step

  1. Target generation

    Study geology, historical records and district history to choose ground worth exploring.

    At Basin Gulch: Complete. The property sits in the historic Philipsburg Mining District.

  2. Sampling and mapping

    Map rock types, take surface samples and dig trenches to find mineralized zones.

    At Basin Gulch: Historical trenching returned gold and silver over lengths up to 159 meters.

  3. Discovery drilling

    Drill the best targets to confirm mineralization below surface.

    At Basin Gulch: More than 320 historical drill holes completed.

  4. Resource definition

    Drill more closely spaced and confirmation holes, then estimate tonnes and grade under a reporting code.

    At Basin Gulch: Next. Expansion and confirmation drilling toward a maiden estimate.

  5. Economic studies

    Assess mining methods, processing, costs and permitting in staged studies.

    At Basin Gulch: Follows a resource estimate.

Comparison

Stages compared: work, output and Basin Gulch status

Stages of mineral exploration and the Lannister Mining Basin Gulch status, November 2026
StageMain outputBasin Gulch status
Target generationA property and a list of targetsComplete. The property sits in the historic Philipsburg Mining District.
Sampling and mappingDrill targetsHistorical trenching returned gold and silver over lengths up to 159 meters.
Discovery drillingDrill intercepts showing grade and lengthMore than 320 historical drill holes completed.
Resource definitionA mineral resource estimateNext. Expansion and confirmation drilling toward a maiden estimate.
Economic studiesA basis for a development decisionFollows a resource estimate.

Key terms

Terms that matter at the resource stage

What is a maiden mineral resource estimate?

A maiden mineral resource estimate is the first formal estimate of the tonnes and grade of mineralization on a property. It is prepared under a reporting code by a qualified person and turns drill results into a defined body of mineralization that investors and partners can compare across projects.

Lannister Mining plans a maiden estimate for Basin Gulch using historical drilling and new work programs. The company says the property has potential to host a significant estimate after expansion and confirmation drilling of historical drill intercepts.

NI 43-101 and S-K 1300

NI 43-101 is the Canadian standard for disclosing scientific and technical information about mineral projects. S-K 1300 is the US Securities and Exchange Commission rule for mining property disclosure. Both rely on a qualified person and set out how exploration results and resources are reported.

Lannister Mining states that there is a clear market premium for S-K 1300 and NI 43-101 compliant gold and silver ounces in the USA. That is why the maiden estimate is the key milestone for Basin Gulch.

Context

Why do mining companies conduct mineral exploration?

Mining companies conduct mineral exploration to find and measure deposits that can replace or add to production, because every operating mine eventually depletes its reserves. Exploration companies take on the earliest and riskiest part of that work.

Exploration timelines often run many years and depend on funding, permits, seasons and results. Year-round road access from Philipsburg helps at Basin Gulch. For the detailed results behind each stage, see the historical drilling page.

Part of the overview of Lannister Mining among mineral exploration companies.

Common questions

Short answers here. The full mineral exploration FAQ covers more.

What are the stages of mineral exploration?
Mineral exploration usually moves through five broad stages: target generation, sampling and mapping, discovery drilling, resource definition with a resource estimate, and economic studies toward a development decision. Each stage reduces uncertainty and usually costs more than the last. Basin Gulch sits between historical discovery drilling and resource definition.
What is a maiden mineral resource estimate?
A maiden mineral resource estimate is the first formal estimate of the tonnes and grade of mineralization on a property, prepared under a reporting code such as NI 43-101 or S-K 1300. Lannister Mining plans a maiden estimate for Basin Gulch using historical drilling and new work programs.
What is NI 43-101?
NI 43-101 is Canada's national instrument setting standards for public disclosure of scientific and technical information about mineral projects. It requires a qualified person to support technical disclosure. Lannister Mining refers to NI 43-101 and the US S-K 1300 standard when discussing compliant gold and silver ounces.
What is S-K 1300?
S-K 1300 is the US Securities and Exchange Commission's rule for mining property disclosure, which brought US reporting closer to international standards such as NI 43-101. It covers how exploration results, mineral resources and reserves are disclosed. Lannister Mining cites S-K 1300 and NI 43-101 compliant ounces as carrying a market premium.
How long does mineral exploration take?
Mineral exploration often takes many years from first sampling to a resource estimate, and longer again to reach a development decision. Timelines depend on funding, permitting, seasons and results. Basin Gulch benefits from year-round road access from Philipsburg. Check lannistermining.com for the latest company timeline.
What is the difference between exploration and development?
Exploration is the search for and definition of mineralization through mapping, sampling and drilling. Development begins once studies support building a mine and covers permitting, engineering and construction. Lannister Mining is at the exploration stage at Basin Gulch, working toward a maiden mineral resource estimate.
Why do mining companies conduct mineral exploration?
Mining companies conduct mineral exploration to find and measure deposits that can replace or add to production, because operating mines eventually deplete their reserves. Exploration companies such as Lannister Mining focus on this early work, aiming to define resources that may later be advanced, partnered or developed.