Company Name: Spectrum Refining and Casting, Inc.

Company Location: Phoenix, Arizona

Company Information: Formed in early 1981, Spectrum Refining produced ingots, and also offered assay services.

Letterhead from an assay completed in 1985 by Spectrum for the Mineral Hill Mine:

Interesting snip from the same Mineral Hill Mine document, showing Spectrum as an assayer, and listing other recognizable Arizona refiners, such as A.S.T. Labs, who produced 10oz ingots collected today, as well as Bahamian Refining Corp.:

From The Arizona Republic newspaper, Nov. 7, 1982:

There are two varieties of ingots, portrait and landscape, and only a handful of examples are known. The known sizes are: 6.9oz (stamped “214.5g”), 9oz, 10oz, 19.6oz, 30oz

Gallery: