MEMOIR OF F. R. CARPENTER 51 



scale. In 1891 he erected the Deadwood and Delaware smelter, which by 

 1898 had grown to comprise five blast furnaces. During this interval he 

 carried on many experiments in semi-pyritic smelting and developed a 

 new mode of operation in this interesting branch of metallurgy. This 

 smelter, destroyed by fire in 1898, was rebuilt by Doctor Carpenter and 

 managed by him until the property changed hands a year or two later. 



Domestic afflictions and the impaired health of his wife led him to leave 

 the Black Hills, in 1900, and return to Denver, which remained there- 

 after his place of residence. His first new work in Colorado was to 

 straighten out the difficulties of the Buena Vista plant ; in the same year 

 he designed and built the works of the Eocky Mountain Smelting Com- 

 pany at Florence, and in 1901 he did the same kind of work for the Clear 

 Creek Mining and Eeduction Company at Golden, the plant of which he 

 managed until 1903. In 1904 he turned his attention to the electrostatic 

 concentration of the ores of the Nonesuch copper mine at Lake Superior, 

 in which he was successful. But he maintained his general practice as 

 consulting mining engineer in Denver. 



His last important problem was the application, in 1908, of the Long- 

 maid-Henderson process to the treatment of Sudbury nickel-copper ores. 

 He showed how by varying the usual mode of operating the copper could 

 be rendered soluble while the nickel remained insoluble, and smelting the 

 residual iron oxide for nickel-bearing pig-iron would furnish a raw ma- 

 terial for making nickel steel in the open-hearth furnace. 



The same year, 1908, he became a charter member of the Mining and 

 Metallurgical Society of America. 



This is, in brief, an outline of the life and career of a man who was 

 always in the front where work was to be done, who by hard work and 

 study prepared himself for the duties that were ahead of him, who had 

 the respect and esteem of all who came into business relations with him, 

 and the personal love of all who knew him intimately. 



He leaves a widow, three grown-up sons, who have followed the father's 

 profession, one minor son, and a daughter. 



Below is appended a list of his papers. The finished papers are not 

 numerous ; the short, signed articles, which he wrote for current news- 

 papers and periodicals to correct erroneous reports or to enlighten popular 

 ignorance, would if collected doubtless amount to several hundred in 

 number. 



BIBIJOGBAPHT 



Ore deposits of the Black Hills of Dakota. American Institute of Mining 



Engineers, vol. xvii, 1888-1889, p. 570. 

 With W. P. Headden : Note on the influence of columbite upon the tin assay. 



Ibid., vol. xvii, 1888-1889, p. 633. 



