SMOKE AND DUST ABATEMENT COTTRELL. 



673 



and characterized as the second largest copper deposit which can be 

 considered as a single geological unit in the United kStates. From 

 the viewpoint of smelter smoke litigation this region has a particu- 

 larly interesting history. Figure 18 shows by a rough sketch map 

 the location of the principal features of interest for the present dis- 

 cussion. 



The first commercially successful smelter in this region was 

 erected at Keswick in 1896 by the Mountain Copper Co. (Ltd.), 

 under the management of Louis T. Wright, and was of especial 

 interest as one of the pioneers in pyritic smelting. Extensive heap 

 roasting was also carried on at this plant with the result of wide- 

 spread deforestation of the surrounding country and the final closing 

 down of the plant in 1905 through injunction proceedings instituted 



Fig. 18.— Sketch map of mines and smelters of Shasta County, C.vlifoenia. 



by the United States Forestry Service. The company has since built 

 a small smelter and acid phosphate works at Martinez, on San Fran- 

 cisco Bay, and now ships its ore to this point, nearly 250 miles 

 distant, for treatment, but even this latter plant has at various times 

 come in for its share of fume litigation. 



In 1901 the Bully Hill Smelter, at Delamar or Winthrop, with a 

 capacity of 250 tons a day, was started. This was later purchased 

 and is now owned by the General Electric Co., but since July, 

 1910, it has been closed as a result of complaints by the United States 

 Forestry Service, who insisted at that time that the plant either 

 close or at least commence efforts on a practical scale looking toward 

 controlling its fumes. 



In 1905 the Mammoth Copper Mining Co., a subsidiary of the 

 United States Smelting, Refining & Mining Co., blew in its present 



44863°— SM 1913- 



-43 



