Silver with Skutterudite

specimen number:
2282005

location:
Cobalt, Ontario, Canada

description:
Crystalline native silver on matrix with metallic skutterudite. The specimen comes with a previous label from the dealership Minerals Unlimited.

The Cobalt mining district, situated in northeastern Ontario, Canada, is a historic silver-mining camp recognized for its high-grade native silver and cobalt-arsenide vein deposits. Geologically, these prolific ore systems are associated with Proterozoic diabase sills, known as the Nipissing diabase, which intruded into Archean volcanic rocks and Huronian sedimentary strata, creating localized fracture networks where rich hydrothermal mineral fluids precipitated. The historic rush began in 1903 following the accidental discovery of silver during the construction of the Temiskaming and Northern Ontario Railway. Rapid underground development followed, with dozens of operations extracting immense quantities of silver and associated cobalt, nickel, and arsenic minerals through complex networks of shafts and adits. Commercial production peaked around 1911, and while operations faced a steady decline due to lower silver prices and depleted high-grade zones, mining and intermittent reprocessing continued through the mid-to-late twentieth century, with formal operations largely winding down by the 1980s.

Minerals Unlimited is a landmark American mineral supply company originally founded in 1948 by two married couples, Dave and Irene Grigsby along with Scott and Mimi Williams, in Berkeley, California. Ralph E. Merrill joined the business in 1953, eventually buying out the founders and pivoting the enterprise toward specialized, rare mineral species for researchers, collectors, and educational institutions rather than solely aesthetic display specimens. Forced to relocate due to a city renovation project in Berkeley, the company moved over 100 tons of stock using five train boxcars and two moving vans to its current location in Ridgecrest, California, in 1970. Long operated by Ralph Merrill until his passing in 2001, the historic enterprise passed to his daughter, Wendi "Ace" Elkins, who has maintained the massive, diverse inventory of worldwide rare and common specimens into the twenty-first century.

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