Mason Valley Mines Company began construction in 1910. The first smelter went online in 1912 and could process 700-1000 tons of copper ore per day. A second 500 ton smelter was constructed in 1913-14. The smelter was named in honor of co-owner, William B. Thompson. The small town of Thompson was developed to house smelter workers. Originally the town consisted of two blocks of houses. It later grew to contain 350 residents and several blocks of stores, homes, saloons and mechanics shop. A post office was open from June 28, 2911 to June 30, 1920. Thompson was connected to the mines by railroads. The Carson and Colorado Railway connected Thompson to Wabuska several miles to the south. The Nevada Copper Belt Railroad then connected Wubuska to the Nevada-Douglas Copper Company mine which extended to Ludwig on the west side of the Sigatse Range.