Rainbow Block
The Rainbow Block is an 878-acre land package with complete mineral rights located in historic North Butte and Walkerville, Montana. First given its moniker by early miners due to the great "Silver Bow" of veins visible on the surface that extend to depth, this area has a rich mining heritage. For over a century, the Anaconda Company mined these world-class lode veins that made Butte famous, primarily focusing on copper deposits more than 2,500 feet deep. Silver Bow Mining Corp. is targeting the untapped potential of numerous, promising silver-zinc-lead-gold veins above the current water table, including the Rainbow, State, Chief Joseph and Lexington Veins. Silver Bow Mining Corp. is solely focused on underground mining methods to extract these resources, including zinc, which is designated as a critical metal by the United States.
Our team has meticulously georeferenced and modeled the extensive network of underground workings within the Rainbow Block, part of the legendary Butte mining complex that features over 10,000 miles of workings. We are currently finalizing an independent resource estimate for this expansive deposit including 42 veins thus far while continuing research and exploration efforts in one of America's most productive mining districts.
Why Rainbow Block?
Unique Advantages
- 100% ownership of property (previously under 50-year lease)
- Previous 3% uncapped NSR replaced with 2% NSR with full buy-down right
-
Rainbow Block, subject of current resource delineation efforts (878 acres) resource based on:
- Over 280 holes drilled from surface to underground
- 8 recent diamond drill holes ~4,700 feet of drilling
- Over 15,000 Anaconda underground channel samples on the actual veins incorporated into the assay database, overseen by independent QPs
- Only above water table (~1,000 ft of depth).
Further Resource Growth Potential
- Rainbow Block — along strike
- Rainbow Block — between current veins (Anaconda focused on veins greater than 7 ft)
- Goldsmith Block — ~328 acres, gold-silver vein system extensions beyond Rainbow Block
- Marget Ann — evaluate for gold-silver and polymetallic potential.
Butte Mining District History: "The Richest Hill On Earth"
Silver was being mined on a small scale as early as 1874 but by the mid-1880's Anaconda encountered significant copper mineralization at depth.
By 1896, Butte mines were producing 26% of the world's copper and 51% of America's copper.
In the late 1910's, Anaconda expanded operations to the adjacent silver-zinc-lead veins while remaining primarily focused on the larger copper deposits.
From 1881 to 2019, the Butte Mining District produced: 11.2 Mt copper; 702 Moz silver; 2.2 Mt zinc; 2.9 Moz gold plus significant Mo and Mn.
From 1916 to 1967, the silver-zinc-lead mines produced 67 Moz silver, 3,600 Mlb zinc, 470 Mlb lead plus significant copper and gold credits.
Between 1989 and 1991, New Butte Mining mined the Rainbow Block for 110,000 t at an average grade of 5.72% Zn, 329 g/t Ag, 2.30% Pb and 2.91 g/t Au.
Quick Facts
High grade Ag-Zn-Au-Pb project on the "Richest Hill on Earth" in Butte, Montana
42, near surface, mineralized veins have been identified less than 1,000 ft from surface
New management headed by Travis Naugle and Quinton Hennigh
Exploration License in place
— underground decline permit amendment now in progress
Project consolidation complete — 3,300 acres of 100% owned private mineral concessions
Strategic acquisition of Anaconda's Ryan shaft location through Goldsmith purchase
Over 100 years of quality Anaconda mining and geologic data
Extensive legacy underground workings and development in place
