Not much is known about the work of Leopold Kuh, but there are some details to his life and movements, listed below. As did many others in the assay business, he listed his prior experience at the San Francisco Mint as a reference to his knowledge and good character.

A Timeline of Leopold Kuh's Happenings, according to local records and documents:

1856-1860

Leopold Kuh. Resides at Green betw. Kearny and Dupont. Leopold Kuh works at the U.S. Mint.
Colville’s San Francisco Directory for the Year Commencing October 1856

Kuh, Leopold. Clerk U.S. Branch Mint. Dwells at NE corner Green and Lafayette.
Langley’s San Francisco Directory for the Year Commencing January 1, 1858

Kuh, Leopold & Fisher Henry I. Gold refinery. Taylor Sr. Wharf corner Green and Lafayette Place.
Langley’s San Francisco Directory for the Year Commencing June 1859

Leopold Kuh. Age: 43, Occupation: Clerk, Birthplace: Hungary. Married, three children.
1860 Eighth Federal Census, San Francisco, California, San Francisco County.

Leopold Kuh at Gold Refinery corner Brannan and Harris. Dwells at NE corner Green and Lafayette.
Langley’s San Francisco Directory for the Year Commencing July 1860

1861-1865

Leopold Kuh & Co. James S. Harrison and Joseph Butler Metallurgical Works. Clark between Davis and East. Dwells at 994 Mason.
Langley’s San Francisco Directory for the Year Commencing September 1861

Leopold Kuh, (Late U.S. Br. Mint, San Francisco,) Assayer and Metallurgical Chemist. A Street, at the Central Company’s Mine, Virginia City.
First Directory of Nevada Territory J. Wells Kelly, San Francisco 1862.

Virginia City. Leopold Kuh. Late U.S. Branch Mint, San francisco Assayer and Metallurgical Chemist. A Street Near the Ophir Mine.
Kelly’s Second Directory of Nevada Territory, 1863

Virginia City. Leopold Kuh of the Branch Mint in San Francisco has an assay office on A Street, near the Ophir Mine, and the unbounded public confidence and his vast professional experience, gives him a leading position among the assayists of the Pacific Coast.
Mercantile Guide and Directory for Virginia City, Gold Hill, Silver City and American City, 1864- 1865.

Leopold Kuh, Assayer and Metallurgical Chemist. Office On Taylor Street, southwest cor. of D. street, Virginia. Established in 1861. Bullion Melted, Assayed, And returns thereof made in stamped Bars or Coin. The correctness of his computations is proved in the same way as done by him during a number of years in the U.S. Mine, San Francisco. All kinds of Ores and Minerals tested, assayed and analyzed. Refers to Public Opinion.
Gold Hill Daily News, 1865

1868

A Rare Chance, All My Assaying Apparatus, Utensils, Materials, Etc. Also, a very comfortable House and Lot, Situated on Sutton Av. corner of Stewart Street, For Sale at a Bargain. Leopold Kuh, corner Taylor and D streets, Virginia, Nevada.
Daily Safeguard, November 2, 1868 (Virginia City)

Leopold Kuh assayer and metallurgical Chemist. 611 Commercial. Dwells at 1906 Powell Street. Leopold Kuh (Formerly of the U.S. Branch Mint San Francisco) Assayer and Metallurgical Chemist No. 611 Commercial Street Opposite U.S. Branch Mint San Francisco, Cal.
Langley’s San Francisco Directory for the Year Commencing December 1869

Leopold Kuh, a Hungarian, became a naturalized citizen in 1869.

1870-1886

Leopold Kuh. Age: 54, Occupation: Assayer, Personal Estate: $1,000, Birthplace: Hungary.
1870 Ninth Federal Census, San Francisco, California, San Francisco County.

Kuh. In this city, March 21, Leopold Kuh, a native of Hungary. Age: 70 years, 5 months.
Alta California, March 22, 1886