Forrest, Robert Wardrop

Degree|Title|Profession: 
MD

See also his brother:  Forrest, William MB

Born 12 October 1840, Galston, Ayrshire, Scotland; died 18 December 1919; University Link: CM (1866) ; MD (1869) Graduate; University of Glasgow degrees: CM, 1866; MD, 1869; occupation categories: General Medical Practitioner; Record last updated: 18th Sep 2013
http://www.universitystory.gla.ac.uk/biography/?id=WH11108&type=P

Gold and silver extraction: the application of heap-leaching cyanidation. Arizona Bureau of Geology and Mineral Technology, Fieldnotes, Winter 1985 (vol. 15, no. 4), page 2: ...Although cyanide had been used as early as 1870 to treat gold ores in the United States, the MacArthur-Forrest process was not officially introduced to domestic mining operations until 1892.  The first cyanide gold mill in the United States was reportedly established at the Vulture mine near Wickenburg, Arizona (Young, [O.E., How they dug the gold: Tucson Pioneers Historical Society, 163 p.], 1967; Figure 3). Haynes [J.P., The cyanide process in Arizona. Engineering and Mining Journal, v. 54, no. 1, p. 3.] (1892) reported the successful treatment of tailings and rebellious ores using cyanide by the Yavapai Gold and Silver Extraction Company in Prescott, Arizona.  At about the same time, several plants near Tombstone, Arizona were using cyanide leaching to recover silver. ...
http://www.azgs.az.gov/arizona_geology/archived_issues/Winter_1985.pdf

Mine Tales--Congress Mine was golden goose (Arizona Daily Star, 2013-12-30):
... Despite the initial discovery of gold in quartz veins in 1870 around the future Congress Mine site, production was limited because the ore was not free milling — meaning able to be treated by crushing and amalgamation.     In 1895, a cyanide plant was built to process the ore from the mine and the previously mined tailings.      The cyanide process, established in South Africa, involved removing gold and silver from host rock by dissolving them in a dilute solution of cyanide, precipitating them with zinc, then vaporizing the zinc, leaving behind the gold and silver.     The process was perfected by Scottish chemists John S. MacArthur, Robert W. Forrest and William Forrest in 1887. ...

Mine Tales--Did the centipede get him, or the whiskey (Arizona Daily Star, 2014-12-22):
...Another innovation, involving the cyanide process, was a discovery made by three inventors in Scotland, including chemist John S. MacArthur, along with medical doctors William Forrest and Robert W. Forrest. It involved a team of assayers, a chemist and a metallurgist who perfected the process of separating gold or silver from ores by using a weak solution of sodium cyanide. The practice proved invaluable to the Bradshaw Mountains mining operations. ...

... In 1887, John Stewart MacArthur, working in collaboration with brothers Dr. Robert and Dr. William Forrest for the Tennant Company in Glasgow, Scotland, developed the MacArthur-Forrest Process for the extraction of gold ores. By suspending the crushed ore in a cyanide solution, a separation of up to 96 percent pure gold was achieved. ...
Source: http://en.wikipedia.org/wiki/Gold_cyanidation [viewed 12/22/2014]


Scheidel A., E.M.  The cyanide process, its practical application and economical results.  California State Mining Bureau, Bulletin No. 5. October, 1894.
Source: https://archive.org/details/cyanideprocessit00scherich

pages 6-7: John Stewart MacArthur, Robert Wardrop Forrest, M.D., and William Forrest, M.B. Improvements in obtaining gold and silver from ores and other compounds. English patent 14,174; 1887. ... John Stewart MacArthur, Robert Wardrop Forrest, and William Forrest Process of obtaining gold and silver from ores. U. S. patent 403,202, dated May 14, 1889. ... John Stewart MacArthur, Robert Wardrop Forrest, and William Forrest. Process of separating gold and silver from ores. U. S. patent 418,137, dated December 24, 1889.

page 108: We, John Stewart MacArthur, Analytical Chemist, of 15 Princes Street, Pllokshields, in the County of Renfrew, North Britain, Robert Wardrop Forrest, M.D., and William Forrest, M.B., both of 319 Crown Street, Glasgow, in the County of Lanark, North Britain, do hereby declare the nature of this invention...

pages 110-111: UNITED STATES PATENT OFFICE. JOHN STEWART MacARTHUR, of Pollokshields, County of Renfrew, and ROBERT W. FORREST AND WILLIAM FORREST, of Glasgow, County of Lanark Scotland.     PROCESS OF OBTAINING GOLD AND SILVER FROM ORES. ... Be it known that we, John Stewart MacArthur, a subject of the Queen of Great Britain, residing at 15 Princes Street, Pollokshields, in the County of Renfrew, Scotland, and Robert Wardrop Forrest and William Forrest, both subjects of the Queen of Great Britain, residing at 319 Crown Street, Glasgow, in the County of Lanark, Scotland, have invented certain new and useful Improvements in Processes of Obtaining Gold and Silver from Ores (for which we have obtained patents in the following countries...

pages 115-116: UNITED STATES PATENT OFFICE. JOHN STEWART MacARTHUE, of Pollokshields, County of Renfrew, and ROBERT WARDROP FORREST and WILLIAM FORREST, of Glasgow, County OF Lanark, Assignors to the CASSEL GOLD EXTRACTING COMPANY (Limited) of Glasgow, Scotland.     PROCESS OF SEPARATING GOLD AND SILVER FROM ORE. ... Be it known that we, John Stewart MacArthur, residing at Pollokshields, in the county of Renfrew, and Robert Wardrop Forrest and William Forrest, both residing at Glasgow, in the county of Lanark, Scotland, all subjects of the Queen of Great Britain, have invented certain new and useful improvements in the process of separating gold and silver from ores...

Last updated Dec 22, 2014 by dpiper