Register of the Oenn Chemical Works (Campo Seco, Calif.) Assay Records, 1912-1919

Processed by Don Walker; machine-readable finding aid created by Don Walker

Holt-Atherton Department of Special Collections

University Library, University of the Pacific

Stockton, CA 95211

Phone: (209) 946-2404

Fax: (209) 946-2810

URL: http://www.pacific.edu/Library/Find/Holt-Atherton-Special-Collections.html

Register of the Oenn Chemical Works (Campo Seco, Calif.) Assay Records, 1912-1919

Collection number: Mss14

Holt-Atherton Department of Special Collections

University Library

University of the Pacific

Contact Information

Holt-Atherton Department of Special Collections
University Library, University of the Pacific
Stockton, CA 95211
Phone: (209) 946-2404
Fax: (209) 946-2810
URL: http://www.pacific.edu/Library/Find/Holt-Atherton-Special-Collections.html

Processed by:: Don Walker
Date Completed:: 5-98
Encoded by:: Don Walker

Descriptive Summary

Title: Oenn Chemical Works (Campo Seco, Calif.) Assay Records,

Date (inclusive): 1912-1919

Collection number: Mss14

Creator:

Extent: 0.5 linear ft.

Repository: University of the Pacific. Library. Holt-Atherton Department of Special Collections

Stockton, CA 95211

Shelf location: For current information on the location of these materials, please consult the library's online catalog.

Language: English.

Administrative Information

Access

Collection is open for research.

Preferred Citation

[Identification of item], Oenn Chemical Works (Campo Seco, Calif.) Assay Records, Mss14, Holt-Atherton Department of Special Collections, University of the Pacific Library

Biography

Campo Seco, eight miles southwest of Mokelumne Hill in Calaveras County prospered briefly as a gold mining camp (1850-1860), but in later years was known principally for its production of copper and zinc, most notably from the Penn Mine. In 1887 the Penn Chemical Co. acquired a mining site and erected a smelter (1899) which served the Penn mines through 1919. The smelter was equipped with a crushing and grinding plant, eight roasting furnaces and a blast furnace. The smelter was shut down and dismantled when the price of copper declined following World War I. Gross returns from the smelting operation exceeded $7 million.

Scope and Content

This collection consists of pages of unbound printed forms on which daily assay samples are recorded, giving the percentages of copper, iron, etc. in each sample. Since the period covered by these records includes the World War I years, the data displayed may show an increase in mining activity in response to war needs.

Container List

BOX 1: DAILY ASSAY RECORD

Vol. 1 Jan. 20, 1912 - Mar. 7, 1914 (100 pp.)

Vol. 2 Jan. 3, 1914 - Feb. 29, 1916 (100 pp.)

Vol. 3 Feb. 29, 1916 - May 19, 1918 (100 pp.)

Vol. 4 Mar. 26, 1917 - Aug. 28, 1918 (42 pp.)

Vol. 5 May 20, 1918 - Mar. 29, 1919 (22 pp.)

| | | | | | | |