sentences:  By then the United Verde Mine had become the leading copper producer in the Arizona Territory, employing about 800 men, and was one of the largest mines in the world.Over its 77-year life (1876 to 1953), this mine produced nearly 33 million tons of copper, gold, silver, lead and zinc ore.The metals produced by United Verde and UVX, the other big mine in Jerome, were said to be worth more than $1 billion.