Show MONTANA METAL production mine output of gold silver copper lead and zinc in 1913 according to victor 0 heikes of the united states geological survey was valued at 61 goo against in 1912 a decrease of due mainly to the decreased output of gold and copper the value of silver lead and zinc combined was greater than in 1912 while the value of the gold and copper was less than in 1912 the production of gold in 1913 was valued at against in 1912 the production of silver in 1913 was ounces against 8 ounces in 1912 copper decreased from pounds in 1912 to pounds in 1913 lead increased from poun pounds ds in 1912 to pounds in 1913 zinc ores in 1913 yielded 0 pounds of spelter against pounds in 1912 |