...summarized. In the following reviews of the operations at the individual mines of the district during 1909 the statements concerning the quantity, character,...quantity of rock stamped, the copper recovered per ton of rock stamped, and the cost of production are based on the published reports of the companies....

...COUNTIES.1 In the following reviews of the operations at the individual mines of the district during 1914, the statements concerning the quantity, character,...short ton of rock stamped, and the cost of production arc based on the published reports of the companies. In the few cases in which reports are not published...

...COUNTIES.1 In the following reviews of the operations at the individual mines of the district during 1912 the statements concerning the quantity, character,...companies. In the few cases in which reports are not puolished a general statement of the character of operations is made from the best information available....

...and av509, 407 .97 60.6 63.5 226,794,139 19.2 .90 364,837,334 62.2 11,321,305 SILVER A5TD COPPER 1ST MICHIGAN. In the following reviews of the operations...operations is made from the best information available. HOTJOHTON COUNTY. In 1918 the mines of Houghton County produced 173,371,829 pounds of copper and 453,957...

...COUNTIES. In the following reviews of the operations at the individual mines of the district during 1911, the statements concerning the quantity, character,...operations is made from the best information available. HOUGHTON COUNTY. In 1911 the mines of Houghton County produced 184,572,400 pounds of copper and 459,715...