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Archer Co., Texas, USA

Relevant commentary from Richard (1915, p. 640):

"The most conspicuous outcrops are found in the central part of Archer County near Archer City and on which attempts were made by The Boston and Texas Copper Co. a number of years ago to reclaim the ores by lixiviation. … The principal mining developments are in general small consisting of surface trenching, pits and slight tunnel work where the nature of the topography permitted. In the vicinity of the deposits the surface is conspicuously altered by oxidation. Copper is observed in the form of nodules of chalcocite, which is the primary ore, coated with superficial layers of the secondary products of oxidation, azurite and malachite. As a result of the oxidation of the contained copper sulphide the clays are stained a light bluish green. At the portal of a slight tunnel a piece of sandstone was observed carrying chalcocite as small black impregnations evidently replacing a kaolinitic cement. Most of the larger pieces of chalcocite were found to be pseudomorphs after wood of small cross section, such as twigs, stems and branches. The deposits, as a whole, are most intimately related to the occurrence of clay and form irregular undulating lenses of uneven thickness."

Additional information can be found in Buckley (1874), though this is mineralogically nonspecific and refers to “blue, green, and black copper”. A scanned version of this reference is available at the link below.

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3 entries listed. 3 valid minerals.

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Buckley, S.B. (1874). First Annual Report of the Geological and Agricultural Survey of Texas. Houston: AC Gray, State Printer.

Richard, L.M. (1915). Copper deposits in the “red beds” of Texas. Economic Geology 10: 634-650.

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