Potentate Mining is pleased to report the successful completion of its third Montana Sapphire Tender, held in Bangkok, Thailand, from November 25 to 27, 2025. The tender featured a unique assortment of sapphires from the Rock Creek Sapphire Mine in Montana and achieved a record number of bids and sales, reflecting strong market interest in the Company’s sapphire offering.

The event was professionally arranged and hosted by Bonas Group at its tender offices in Bangkok. Potentate Mining’s participation provided an important opportunity to present the distinctive quality, colour range, and uniqueness of Rock Creek sapphires to buyers and industry participants in one of the world’s key gemstone trading centres.

Potentate Mining is encouraged by the strong response to the tender and appreciates the support of its partners and participants. The Company looks forward to building on this momentum and continuing to expand awareness and demand for Montana sapphires in the global marketplace.

Potentate Mining was recently featured on the website of the Gemological Institute of America (GIA), in an article by Tao Hsu, Andrew Lucas, Shane McClure, Nathan Renfro, and Kevin Schumacher. The richness of Rock Creek along with its history and geology are highlighted, as well as Potentate’s operation and responsible sourcing. Visit the link below for the GIA website, where a video and several galleries are available.

“INTRODUCTION

Of all the sapphire deposits found in Montana, the richest is in the Rock Creek (Gem Mountain) district. Between 1890 and the 1930s, over 65 tonnes of rough sapphire were recovered from this area and continuously supplied Switzerland’s watchmaking industry until the introduction of synthetic sapphire in the late 1930s.

For the first time in the past 120 years, the rich sapphire-bearing land in this area is owned by a single entity. To witness the beginning of a new era of sapphire mining in Montana and gain a full understanding of this operation, a GIA team visited the new Rock Creek sapphire mine in early August.

A BRIEF HISTORY

Sapphire was originally discovered in the Rock Creek area during gold exploration in the late 1800s, like many Montana sapphire deposits—gold mining was extremely popular in the area at the time. Since the climax of sapphire mining, boosted by demand from the watchmaking industry, local sapphire mining has largely supported the sapphire-oriented jewelry businesses in Philipsburg and the fee-paying sapphire hunters.

In 2011 the current mine owner, Potentate Mining, purchased the Eureka Gulch property on the north side of Gem Mountain and in 2014 finished purchasing the land on the south side. Today the company owns about 3,000 acres of sapphire-producing land in this historically important mining area.”