This image provided by the Saddle Ridge Hoard couple via numismatist Don Kagin shows one of the six decaying metal canisters filled with 1800s-era US gold coins unearthed in California by two people who prefer to remain anonymous. The value of the "Saddle Ridge Hoard" treasure trove is estimated at $10 million or more. Nearly all of the 1,427 coins, dating from 1847 to 1894, are in uncirculated, mint condition, said David Hall, co-founder of Professional Coin Grading Service of Santa Ana, which recently authenticated them. [Xinhua]