Show A small quantity of copper was produced in montana as early as 1868 in 1881 the output was less than pounds but by 1887 montana took first place amon among the states and for twenty years with the exception of 1891 continued to hold the supremacy being displaced by arizona in 1907 production of copper to the close of 1912 has amounted to pounds slightly more than one third of the total production of the united states since 1845 0 taxation of mines rev st 1909 which limits the assessment for taxation of gold silver lead copper etc mines to an amount not exceed exceeding in the amount at which the lowest producing t mine in the same locality is assessed is a valid exercise of the legisla tives power and not an invasion of the functions of the assessor foster county assessor v jars hart consol mining co supreme court of colorados colorado pacific 48 |