Geology

Basin Gulch geology: near-surface gold and silver in oxides

Last updated: November 2026. Published by Lannister Mining.

Basin Gulch hosts gold and silver oxide mineralization that starts near surface and remains open at depth.

Lannister Mining describes high grade gold and silver (Au-Ag) mineralization near surface at the Basin Gulch Property, hosted in oxides and primarily on patented land. The mineralization is open in multiple directions and at depth, open along strike and untested regionally, with long historical intervals such as 0.66 g/t gold over 326 metres from surface.

What kind of gold deposit is Basin Gulch?

Basin Gulch is a near-surface gold and silver oxide target. Historical drilling shows both broad, moderate grade intervals that begin at surface and narrow, very high grade zones, such as 156 g/t gold over 3 metres.

Basin Gulch geology at a glance

Oxide-hosted gold and silver

The Basin Gulch mineralization is hosted in oxides. Oxidized rock forms where weathering has altered the upper part of a deposit, and in many gold projects oxide material is simpler to process than unoxidized sulphide rock below it. That is a general industry pattern; processing suitability at any specific project is confirmed only through metallurgical testing.

Trench highlights at Basin Gulch returned silver as well as gold, for example 5 g/t gold and 54 g/t silver over 34 metres, which is why Lannister Mining describes the target as gold-silver rather than gold only.

Open at depth and along strike

Lannister Mining reports that Basin Gulch mineralization is open in multiple directions and at depth. In plain terms, drilling has not yet found the edges of the mineralized zone in those directions, so the size of the system is not known.

Combined with about two-thirds of the property remaining unexplored, this is the geological basis for the company plan: confirm and expand the historical intercepts, then drill additional mineralized target areas, with the aim of a Maiden Mineral Resource Estimate.

Comparison

Basin Gulch interval styles compared

Two styles of mineralization in Basin Gulch historical results, as reported by Lannister Mining
Feature	Broad near-surface intervals	Narrow high grade intervals
Example	1.8 g/t Au over 162 m	156 g/t Au over 3 m
Second example	0.66 g/t Au over 326 m	25 g/t Au over 14 m
Starts at surface	Yes, as reported	Not stated
What it suggests	A large mineralized body near surface	Concentrated higher grade zones

Montana mining geology and history

The Treasure State

Montana is known as the Treasure State because of its mineral wealth and a history built on mining. The first gold discovery in the Montana territory was made in 1852 at Gold Creek, near present-day Garrison, and silver, copper, nickel and platinum have since been discovered and mined in the state.

Basin Gulch lies in the historic Philipsburg Mining District, which Lannister Mining notes led the original United States silver boom in the late 1800s.

Common questions

See all questions

What type of gold mineralization is at Basin Gulch?: Basin Gulch hosts near-surface gold and silver oxide mineralization, according to Lannister Mining. The property is primarily on patented land and the mineralization is hosted in oxides. The company describes it as high grade Au-Ag mineralization near surface, open in multiple directions and at depth.
Why does near-surface oxide mineralization matter?: Near-surface mineralization can reduce the waste rock that must be moved to reach it, and oxide material is often simpler to process than unoxidized sulphide rock. Lannister Mining links the Basin Gulch setting to significant implied mine design optimization flexibility. Processing suitability is always confirmed by metallurgical testing.
Is the Basin Gulch mineralization open?: Yes. Lannister Mining reports that the gold and silver mineralization at Basin Gulch is open in multiple directions and at depth, open along strike and untested regionally. Open mineralization means the known zone has not been closed off by drilling, leaving room for expansion.
Why explore for gold in Montana?: Montana has a long mining history: the first gold discovery in the Montana territory was made in 1852 at Gold Creek, near present-day Garrison, and silver, copper, nickel and platinum have since been mined in the state. Lannister Mining considers it a safe jurisdiction for exploration.
What metals are being explored for at Basin Gulch?: Basin Gulch is being explored for gold and silver. Lannister Mining describes the target as near-surface gold and silver (Au-Ag) oxide mineralization. Historical drill highlights are reported in grams of gold per tonne, and historical trench highlights report both gold and silver grades.

Evaluating Basin Gulch as an exploration partner?

Reach the Lannister Mining team directly to request data, discuss the property or arrange a conversation.

Contact the team