A Timeline of Edward Ruhling & Co.'s Happenings, according to local records and documents:

1858

Edward Ruhling assayer at 114 Montgomery. Dwells at Pine between Dupont and Kearny.
Langley’s San Francisco Directory for the Year Commencing January 1, 1858

1861-1865

Lithograph of Virginia City, Nevada Territory, in 1861 with E. Ruhling & Co.’s assay office included.
The Saga of the Comstock Lode (1934)

Ed Ruhling & Co. Bankers and Assayers C Street Virginia City Nevada Territory.
E Ruhling & Co. assayers, W Side B near Pasters’
J. Wells Kelly, First Directory of Nevada Territory 1862

E. Ruhling & Co. Bankers and Assayers Granite Building B Street opposite Taylor. Virginia, N.T.
Assay Office E. Ruhling & Co. Granite Building, B Street, opposite Taylor Virginia N.T.
E. Ruhling E. Ruhling & Co. Resides at 38 South B
John C. Ruhling bookkeeper with E. Ruhling & Co.
Kelly’s Second Directory of Nevada Territory 1863

E. Ruhling & Co. Bankers and Assayers 42 South B
E. Ruhling of E. Ruhling & Co. Resides on North A
John C. Ruhling cashier E. Ruhling & Co.
Mercantile Guide and Directory for Virginia City, Gold Hill, Silver City and American City 1864-1865: Virginia City.

1868-1884

A change. E. Ruhling & Co. have purchased the assay office of Van Wyck & Co., Gold Hill, and will hereafter carry on the business of assaying both in this city and at their new branch office in Gold Hill. The firm is one of the most enterprising in the State, and have facilities for smelting and assaying at the shortest possible notice any amount of crude bullion that may be brought to either of their offices. All of their assays are warranted to conform to the standard of the United States Mint. Their prices are precisely the same as are charged in San Francisco.
Territorial Enterprise, April 4, 1868

“A Piece of the Last Spike. We were yesterday presented with a piece-about an ounce in weight-of the last spike-the silver spike of Nevada-by E. Ruhling & Co., the well known assayers of this city. E. Ruhling & Co. had the order for making the silver spike, and it was under their supervision that it was manufactured. When the spike was made — drawn out from the bar which was moulded for the purpose — it was found to be much longer than necessary, and some four inches of the thick portion was cut off. As even the smallest portion of this last spike will for all time be much treasured, we will give its exact fineness, which is gold, 50; silver 942; value per ounce, $22.05. Those who may hereafter manufacture bogus specimens of the “last spike” will do well to have the fineness in gold and silver correspond with the genuine. The only mark on the spike when it left this city was the stamp of E. Ruhling & Co. When brought back we understand that it will be beautifully polished and appropriately engraved, when it will be deposited in the State Cabinet at Carson City...”
Territorial Enterprise, May 7, 1869

Ed Ruhling, Age: 38, Occupation: Assayer, Real Estate: $500, Personal Estate: $300, Birthplace: Hamburg, Germany. Listed as a naturalized citizen.
1870 Ninth Federal Census, Virginia City, Nevada. Storey County

Dissolution of Copartnership

Notice is hereby given that the copartnership heretofore existing between E. Ruhling and H.V.S. McCullough, under the firm name of E. Ruhling & Co., and doing business at the City of Virginia and Town of Gold Hill, in Storey County, and the Town of Hamilton, in White Pine County, Nevada, is this day dissolved by mutual consent. H.V.S. McCullough continues the business, and is authorized to settle all debts due to and by the company.

Dated Virginia, March 31, 1871.

E. Ruhling,

H.V.S. McCullough
Territorial Enterprise, April 4, 1871

A Large Funeral. The funeral of John C. Ruhling took place yesterday afternoon and was very largely attended... He was a brother of Edward Ruhling, of the banking and assaying firm of Ruhling & McCullough, in the early days, in this city. When it was seen that the illness of John C. Ruhling was liable to terminate fatally, Edward was telegraphed for, he being employed as an assayer at the San Francisco Mint. He arrived here on Sunday morning but a few minutes after his brother died.
Territorial Enterprise, June 24, 1884