sentences:  This mine eventually produced more than $125 million worth of ore and paid more than $50 million in dividends.Total production amounted to four million tons, much less than the United Verde total but from uncommonly rich ore averaging more than 10 percent copper and in places rising to 45 percent.Starting in 1914, World War I greatly increased the demand for copper, and by 1916 the number of companies involved in mining near Jerome reached 22.