[D9231AAC], Letter from G S Smith to Thomas Alva Edison, January 16th, 1892
https://edisondigital.rutgers.edu/document/D9231AAC
Transcription
The Thomson Houston Electric Light Co. 509 Arch Street Philadelphia Jan 16, 1892 Mr. Thos A. Edison Menlo Park, N.J. Dear Sir: Please be so kind as to inform me if there is any known practical method of extracting gold from sand as they are found in California. Your response will greatly oblige. Yours truly [Signed: Smith, G.S] If that is Beach sand I am afraid not as heavy black sand is only 1/2 magnetic +the non magnetic part interfere with all water processes E