Gold and silver exploration in west-central Montana

Basin Gulch drill holes

Last updated: November 2026

Basin Gulch has more than 320 historical drill holes on a gold and silver property in west-central Montana.

Lannister Mining is exploring the Basin Gulch property, where historical drill holes returned near-surface, oxide-hosted gold-silver intercepts such as 1.8 g/t Au over 162 meters from surface. The mineralization is open at depth and along strike, two-thirds of the property is unexplored, and the work is aimed at a maiden mineral resource estimate.

Read the project facts

Historical drill highlightsIntercept length, drawn to scale

1.8 g/t Au162 m, from surface
0.66 g/t Au326 m, from surface
3.2 g/t Au72 m, from surface
156 g/t Au3 m
25 g/t Au14 m

Grades and lengths as reported by Lannister Mining. Historical results, not a current mineral resource.

How many drill holes are at Basin Gulch?

More than 320 historical drill holes have been completed at Basin Gulch, according to Lannister Mining. The company calls this significant historical work and plans to combine it with new work programs in a future maiden mineral resource estimate.

The drilling and trenching highlights below are reported by Lannister Mining. They are historical results, not a current mineral resource, and planned confirmation drilling is intended to test them. See every reported intercept, ranked.

Definition

What is the Basin Gulch property?

The Basin Gulch property is a gold and silver exploration project in west-central Montana, explored by Lannister Mining. It lies in the historic Philipsburg Mining District, which led the original United States silver boom in the late 1800s.

The property is primarily on patented land. Its mineralization is hosted in oxides and reported as high grade and near surface. A core of 11 patented mining claims is surrounded by 53 unpatented claims, for a total of 1,107 hectares. More than 320 historical drill holes have been completed, the property has not been mined out, and Lannister Mining reports that two-thirds of it is still unexplored. Access is year-round from Philipsburg on paved and well-maintained gravel roads.

Numbers

Basin Gulch by the numbers

Every figure below is as reported by Lannister Mining for the Basin Gulch property.

historical drill holes: 320+; historical drill holes
patented mining claims: 11; patented mining claims
unpatented mining claims: 53; unpatented mining claims
total land package: 1,107 ha; total land package
of the property still unexplored: Two-thirds; of the property still unexplored
from Butte, Montana: 1 hour; from Butte, Montana

The longest reported drill highlight is 0.66 g/t Au over 326 meters (1,069.6 feet) from surface. The highest grade highlight is 156 g/t Au over 3 meters (9.8 feet).

Basin Gulch drill holes compared with trench results

Lannister Mining reports two kinds of historical sampling at Basin Gulch. The table compares them on the same criteria.

Lannister Mining Basin Gulch historical drill and trench highlights compared
Criterion	Drill hole highlights	Trench highlights
What is sampled	Rock below surface, recovered from drill holes	Bedrock exposed at surface in excavated trenches
Highlights reported	5 intercepts	4 trenches
Metals reported	Gold (Au)	Gold (Au) and silver (Ag)
Longest interval	0.66 g/t Au over 326 m	62 g/t Au and 32 g/t Ag over 159 m
Highest gold grade	156 g/t Au over 3 m	62 g/t Au over 159 m
Highest silver grade	Not reported	54 g/t Ag (with 5 g/t Au) over 34 m

Source: Lannister Mining Basin Gulch property page. Figures shown exactly as reported.

How does Basin Gulch move from historical drilling to a resource?

Lannister Mining has described the steps it plans to take with the historical Basin Gulch drill data.

1Compile the historical workMore than 320 historical drill holes and trench results form the starting data set.
2Confirm historical interceptsConfirmation drilling tests whether historical results hold up.
3Expand known mineralizationMineralization is open at depth and along strike, so expansion drilling follows it outward.
4Test new targetsFuture drilling concentrates on additional mineralized target areas across the property.
5Prepare a maiden resource estimateHistorical and new work feed a future maiden mineral resource estimate.

Property

Basin Gulch property, Montana

The Basin Gulch property sits in the heart of the historic Philipsburg Mining District in west-central Montana, about one hour from Butte. Montana is known as the Treasure State for its mineral wealth, and the first gold discovery in the Montana territory was made in 1852 at Gold Creek, near present-day Garrison.

Read the full Basin Gulch property overview or see the location and access maps.

For partners

Why investors and exploration partners look at Basin Gulch

Basin Gulch pairs a large historical data set with mostly untested ground. Lannister Mining 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, and that the project offers exposure to an asset that has seen significant historical work, has not been mined out and is in a premium jurisdiction.

Read the Basin Gulch investor briefing

Lannister Mining's June 2026 investor presentation goes deeper into the project than this site. It is published on the company's Invest page for investors and exploration partners.

Investor presentation (PDF)Lannister Mining Invest page

Common questions about Basin Gulch

How many drill holes have been drilled at Basin Gulch?: More than 320 historical drill holes have been completed at Basin Gulch. Lannister Mining describes this as significant historical work and plans to use it, together with new work programs, in a future maiden mineral resource estimate. Planned confirmation drilling is intended to test historical intercepts before they support any resource.
What are the best historical drill intercepts at Basin Gulch?: Lannister Mining reports these highlight intercepts: 1.8 g/t Au over 162 meters from surface, 0.66 g/t Au over 326 meters from surface, 3.2 g/t Au over 72 meters from surface, 156 g/t Au over 3 meters, and 25 g/t Au over 14 meters. The drill results page ranks them by grade times length.
Where is Basin Gulch in Montana?: Basin Gulch is in west-central Montana, in the historic Philipsburg Mining District. It has year-round access from Philipsburg on paved and well-maintained gravel roads and is about one hour from Butte. The Philipsburg district led the original United States silver boom in the late 1800s, so the property sits in ground with a long mining history.
How big is the Basin Gulch land package?: The Basin Gulch land package includes 11 patented claims and 53 unpatented claims covering 1,107 hectares, which is about 2,735 acres. The property is underlain by a core of patented mining claims surrounded by unpatented mining claims, with multiple high priority targets near the historic resource area.
How much of Basin Gulch is still unexplored?: Lannister Mining reports that two-thirds of the Basin Gulch property is still unexplored. The company describes this as phenomenal exploration upside across the 1,107 hectare land package, which also has multiple high priority targets near the historic resource. Future drilling will focus on additional mineralized target areas within the property.
How can I get the Basin Gulch investor briefing?: Lannister Mining publishes its investor presentation on its Invest page at lannistermining.com/invest. The current USA version is dated June 2026 and covers the Basin Gulch project in more depth than this site. The same page lists the company's investor relations details.

See all Basin Gulch questions and answers