silver mining in the united states began on a major scale with the discovery of the comstock lode in nevada in 1858. the industry suffered greatly from the demonetization of silver in 1873 by the coinage act of 1873, known pejoratively as the "crime of 73", but silver mining continues today.
the turbulence in stocks have been great news for gold and silver, as well as the related mining stocks, which are enjoying some of their best gains since the financial crisis. oil prices as
gold mines in the united states. since the discovery of gold at the reed farm in north carolina in 1799, gold mining in the united states has continued. the first documented occurrence of gold occurred in virginia in 1782. some minor gold production took place in north carolina as early as 1793, but did not create excitement.
a second company, spokane, washington-based crevice mining group, is seeking permission to explore for gold near jardine, just over yellowstone’s northern boundary. both exploration sites have a
gold was booming 44 years ago when cbs news last visited the mine in lead. but after years of increasing production costs and declining prices, the mine shut down 15 years ago. hundreds of people
the united states is the third-largest gold-producing country, after south africa and australia. mines in nevada account for more than 80 percent of u.s. production. according to a 2005 article in the new york times, nevada had approximately 20 open pit gold mines, about half of the active mines in the united states.
Environmental Protection and Health One
LUM is of little dust and noise, achieving Environmental Protection Request, it is quite environmentally friendly
To Improve the Purity Two
Low investment cost: LUM use PLC/DCS automatic control system, well save the cost of operators.
High Efficiency Three
LUM has excellent grinding-efficiency for the special design of roller shell and grinding plate curve.
Low Cost Four
Utilize advanced working principle and reduce the grinding time, as a result, the final products has little iron and the whiteness and purity are raised.