Mineral exploration in the USA

Mineral exploration companies in the USA: what investors should know

Published by Lannister Mining Last updated November 2026

Mineral exploration companies in the USA search for metals like gold and silver on private and federal land, and report resources under SEC S-K 1300 or Canada's NI 43-101.

Lannister Mining, which publishes this guide, is one of these mineral exploration companies, focused on the Basin Gulch Property in Montana. The company states there is a clear premium in the market for S-K 1300 and NI 43-101 compliant gold and silver ounces in the USA. This page explains why.

Why do compliant US gold ounces command a premium?

Lannister Mining states that US-based companies with 43-101 compliant resources are trading at a significant premium compared to their peers. Compliant reports give investors standardized, qualified-person reviewed information, which makes ounces easier to compare and value.

That is why the company's goal of a future Maiden Mineral Resource Estimate at Basin Gulch matters: it would convert historical drill data into compliant ounces in a US jurisdiction.

Disclosure standards relevant to Lannister Mining's Basin Gulch Project
Standard	Who sets it	What it covers
S-K 1300	US Securities and Exchange Commission	Mining property disclosure for SEC registrants, including resources and reserves
NI 43-101	Canadian Securities Administrators	Disclosure of scientific and technical information on mineral projects
Shared requirement	Both standards	A qualified person must support the reported estimates

What do mineral exploration companies in the USA do?

They acquire land with mineral potential, test it through sampling, trenching, and drilling, and aim to define resources that can be reported under a recognized standard. Most do not produce metal; they fund work by raising capital and create value by proving up deposits.

Many work in western states with long mining histories. Montana, known as the Treasure State, is one of them, and Basin Gulch sits in its historic Philipsburg Mining District.

How land tenure works for US explorers

US exploration ground is usually held as patented claims, which are private land, or unpatented claims, which grant mineral rights on federal land managed by the Bureau of Land Management. Unpatented claims require ongoing filings and fees.

Basin Gulch combines both: a core of 11 patented claims surrounded by 53 unpatented claims, for 1,107 hectares in total.

Where can I learn more about US mineral resources?

The USGS Mineral Resources Program publishes national data on mineral resources, and the Montana Bureau of Mines and Geology covers Montana specifically. For a single project in detail, start with the company's own technical disclosures.

Back to the main guide to gold exploration in Montana

Full project details live on the Lannister Mining website

Property maps, team biographies, and the June 2026 USA Investor Presentation for the Basin Gulch Project.

Visit lannistermining.com Investor presentation (PDF)

Common questions

Short answers from the full gold exploration FAQ.

Are there mineral exploration companies working in the USA?

Yes. Many mineral exploration companies explore in the United States, especially in western states with long mining histories, such as Montana. US projects that report resources under SEC S-K 1300 or NI 43-101 give investors standardized disclosure. Lannister Mining is one such company, focused on the Basin Gulch Property in Montana.

What is mineral exploration?

Mineral exploration is the search for economic concentrations of metals or minerals, such as gold, silver, or copper. Geologists use maps, rock and soil samples, geophysics, trenches, and drill holes to decide whether a deposit exists and how large it might be. Most exploration projects never become mines, which is why each stage is designed to reduce uncertainty before more money is spent.

Why do investors value compliant gold ounces in the USA?

Lannister Mining states there is a clear premium in the market for SK1300 Technical Report and NI43-101 Technical Report compliant gold and silver ounces in the USA. Compliant reports give investors standardized information reviewed by a qualified person. The company also states that US-based companies with 43-101 compliant resources trade at a significant premium to peers.

What is the difference between S-K 1300 and NI 43-101?

S-K 1300 is the US Securities and Exchange Commission's rule for mining property disclosure, while NI 43-101 is the Canadian standard for disclosure on mineral projects. Both require a qualified person and set rules for reporting resources and reserves. Lannister Mining states there is a market premium for compliant gold and silver ounces in the USA.

What is the difference between patented and unpatented mining claims?

A patented claim is private land where the federal government has transferred title, while an unpatented claim grants mineral rights on federal land without surface title. Unpatented claims require ongoing filings and fees with the Bureau of Land Management. Basin Gulch is primarily on patented land, with unpatented claims surrounding that core.

What is a Maiden Mineral Resource Estimate?

A maiden mineral resource estimate is the first formal estimate of the tonnage and grade of a deposit, prepared by a qualified person under a standard such as SEC S-K 1300 or Canada's NI 43-101. It turns drill data into a reportable resource. For Basin Gulch, Lannister Mining describes a future maiden estimate as a central goal.