(Reuters) — A trove of rare Gold Rush-era coins unearthed in California last year by a couple as they walked their dog may be the greatest buried treasure ever found in the United States, worth more than $10 million, a currency firm representing the pair said on Tuesday (February 25). The 1,400 gold pieces, dating to the mid- to late 1800s and still in nearly mint condition, were discovered buried in eight decaying metal cans on the couple’s land last […]