Silver Bow Mining Commences Underground Drilling at Rainbow Block
News related to:Silver Bow Mining Corp · 2 min read
BUTTE, Mont., Nov. 11, 2026 /CourierPR/ -- Silver Bow Mining Corp. has commenced underground exploration drilling at its flagship Rainbow Block Project in Butte, Montana, marking the first such activity in the historic Butte Mining District in over three decades. The company is using the newly constructed Rainbow Decline drill station, located at the 6,210-foot elevation, to advance its plans to re-establish and expand underground activities at the Rainbow Block.
The initial drilling will target multiple mineralized vein systems, including the Badger and Emily veins, where recent surface drilling has identified high-grade mineralization.
The company plans to expand its underground exploration activities with 30,000 feet of drilling from the Rainbow and Chief Joseph declines during the remainder of 2026 and 2027. The initial program will focus on multiple mineralized vein systems, including the State, Badger, Edith May, and Auraria veins to the south, and the Jessie, Rainbow Splay, Alice, Emily, Emily High-Grade, Rainbow, Boston, and Jersey Blue veins to the north.
On September 1, 2026, the company reported an intersection in the Badger Vein of 4.0 meters grading 994.2 grams per tonne (g/t) silver equivalent (AgEq) (13.1 ft @ 29 opt AgEq), including 2.3 meters grading 1,586.1 g/t AgEq (7.4 ft @ 46.26 opt AgEq), from drill hole SBM26-03. On November 5, 2026, the company reported an intersection in the Emily Vein of 11.2 meters grading 312.7 g/t AgEq (36.8 ft @ 9.12 opt AgEq), including 3.6 meters grading 462.7 g/t AgEq (12.1 ft @ 13.49 opt AgEq), from drill hole SBM26-08.
The underground drilling will follow up on recent high-grade results and test additional mineralized vein systems. The program will include follow-up drilling on the Badger and Emily veins, where recent surface exploration has identified encouraging high-grade mineralization outside of Silver Bow Mining's current Inferred Mineral Resource.
The AgEq grades quoted in this news release use metal prices and estimated recovery assumptions consistent with the company's current Mineral Resource estimate. The following metal prices were used: silver, $25.00/oz; gold, $2,500/oz; zinc, $1.31/lb; and lead, $0.90/lb. Estimated metallurgical recoveries of 90% were applied to each metal included in the calculation.