Montana Historical Society
Archives
A8:3-6
Anaconda Copper
Mining Company
Anaconda Copper Mining Company Reduction Dept. / Washoe
Sampler records
1905-1971
20 linear feet
These records of the Anaconda Copper Mining Company consist
of assay records (1905-1964) of the Washoe Sampler and an index (1920s-1960s) to financial
journals of the Anaconda Reduction Department. The assay records include numerical listings
by sample lot number and give the name of the mine/company and assay information including
ounces of copper, gold, and silver per ton of ore. Accompanying these records is an index by
mine/company giving lot number and date; and assay cards giving more detailed assay/ore
settlement information. There is also Berkeley Pit ore reserve information (1959-1964). The
Reduction Department records consist of an index to some of the financial journals of
itemized expenditures which are located in Manuscript Collection 169, The Anaconda Copper
Mining Company Records.
English
Arranged by series: Production Records (box 1-3; card-box 4-34) and Financial Records
(card-box 35-59)
Collection is open for research
Researchers must use collection in accordance with the policies of the Montana Historical
Society Library and Archives. The Library and Archives does not necessarily hold copyright
to all materials in the collection. In some cases, permission for use may require additional
authorization from the copyright holders. For more information, contact the Montana
Historical Society Library and Archives.
[item description and date]. Name of Collection. Collection Number. [box and folder
number]. Montana Historical Society Library and Archives. Helena, Montana.
Acquisition information available upon request.
Preliminary processing, 2010
This collection is indexed under the following headings in the Montana Historical Society
Archives catalog. Researchers desiring materials about related topics, persons, or places
should search under these terms.
Assaying--Montana--Anaconda.
Mines and mineral
resources--Montana.
Montana
Mines and mineral
resources
Detailed Description of the Collection
Production Records
1
Assay record (numerical listing by sample lot number.
Gives name of mine/company; and assay information, including ounces of copper, gold,
silver, lead, and other minerals per ton or ore) [bound volumes #1-12]
1905-1930
2
Assay record (numerical listing by sample lot number.
Gives name of mine/company; and assay information, including ounces of copper, gold,
silver, lead, and other minerals per ton or ore) [bound volumes #13-17]
1935-1964
3
Assay record (numerical listing by sample lot number.
Gives name of mine/company; and assay information, including ounces of copper, gold,
silver, lead, and other minerals per ton or ore) [unbound volumes]
1966-1971
4-13
Index to assay record (alphabetical cards for
company/mine name, date, and sample lot number)
1905-1964
14-30
Alphabetical card files (by company / mine name:
includes assay/ore settlement date, including dry and wet weight of ore, ounces of
copper, gold, silver, lead, and other minerals per ton or ore, quantity of ore, cost,
and royalty payment)
1905-1960s
31-34
Alphabetical card files (by company / mine name:
includes assay/ore settlement date, including dry and wet weight of ore, ounces of
copper, gold, silver, lead, and other minerals per ton or ore, quantity of ore, cost,
and royalty payment)
1910s-1920s
Financial Records
35-40
Index to financial journals in Anaconda Copper Mining
Company Records (MC 169, Vol. 966-972)
1910s
40-43
Index to financial journals in Anaconda Copper Mining
Company Records (MC 169, Vol. 973-981)
1920s
44-51
Index to financial journals in Anaconda Copper Mining
Company Records (MC 169, Vol. 982-996)
1930s-1960s
52-54
Index to accrued interest receivable
1930s-1940s
55-56
Index to arsenic sales
1930s-1940s
57
Index to payroll records
1940s-1960s
58-59
Berkeley Pit ore reserves classification
1960s