UTAH ACADEMY OF SCIENCES 227 
INVESTIGATIONS BY STUART CROASDALE. 
It was about 1892 when Stuart Croasdale?, while 
working on flue and stack deposits from a chloride roast- 
ing plant, first recognized the possibilities of making 
volatilization a major instead of a minor event of the 
roast. Subsequently Mr. Croasdale conducted experi- 
ments on a,large number of different ores; results of 
which showed that a high percentage of the metalliferous 
values could be chloridized and volatilized with compar- 
ative ease. In concluding his exhaustive investigations, 
which were made to include semi-commercial tests in a 
rotary kiln 25 feet long and 314 feet inside diameter, Mr. 
Croasdale’s chief difficulty was éxperienced in not being 
able satisfactorily to collect the fumes from the fur- 
nace gases.* 
INVESTIGATIONS OF BEN HOWE. 
Mr. Howe’s experiments were conducted during 1910 
and 1912, on antimonial gold ores from the Gwalia Con- 
solidated Mining Company’s properties in western Aus- 
tralia. Uninformed of Mr. Croasdale’s work in America, 
Mr. Howe conducted an original investigation and pub- 
lished* the results of his experiments, believing at the 
time that he was introducing a new metallurgical method. 
The experiments made by Mr. Howe were very 
similar to those conducted by Mr. Croasdale. Also the 
size and kind of equipment employed by each was practi- 
cally the same. A most interesting feature in the com- 
*Eng. & Min. Jr. Aug. 29, 1903, vol. 76, p. 312, and Sept. 19, 
1903, vol. 76, p. 420. 
RELATING PATENTS.—U. S. Patent No. 741,712, issued 
October 20, 1903, to Edwin C. Pohle and Stuart Croasdale, Denver, 
Colorado. Assignors to Metal Volatilization Company, Philadelphia, 
Pa., a corporation of New Jersey. U.S. Patent No. 811,085, issued 
January 30, 1906, to Edwin C. Pohle. 
3Mining Magazine, March, 1914, vol. 10, p. 200. 
4Western Australian Chamber of Mines, December, 1912. Ac- 
cording to Editor, Mining Magazine, Howe is fully quoted in Mining 
Magazine, March, 1913, and Min. & Sci. Press, March 29, 1913. 
