[Alternative 1] This possible explanation is mine and should make more sense to most readers. Occam's Razor applies. We'll work backwards in time. Points made are brief. Much Victorio Peak documentation is available in
The Gold House - The Discovery, by John Clarence, a book probably meant to support the Noss story, but instead exposes Milton Noss for the man he was. Highly recommended.
A) Noss was murdered 1949.
B) Noss operated Victorio Peak investment scam through much of the 1940s.
C) Noss "accidentally" dynamited Victorio Peak treasure trove entrance, initiating investment scam.
D) Noss "gold bars" 1939 assay ~80% Cu, ~150 oz/ton Au, ~100 Ag. This explains "dark color".
D) Noss "discovered" treasure trove entrance, 1937.
E) Noss misdirected attention away from Caballos, late 1930s. Salts Victorio Peak with Caballo bullion recovery. Gold bars were described as heavy and dark colored, like "pig iron."
F) Noss, Willy Douthit and others were involved in alleged gold recoveries and murders in the Caballo Mountains late 1920s to mid 1930s. Noss left area for Victorio Peak. Douthit left area for California with lots of money, and changed name to Laurence Foremen.
G) Sometime in the early 1800s, an unknown number of crudely smelted copper bars were moved from Santa Rita del Cobre 50 miles east to the Caballos. The circumstances (who, when, why, where) is undocumented. This Spanish mine's early bullion shipments were reported to have been mostly copper with large amounts of gold and silver.
The Noss gold bars were primarily copper with significant amounts of gold and silver. They were recovered in the Caballos (assay below). Their provenance may indeed be explained as matching the copper bullion mined by Carrasco and other Spaniards at Santa Rita beginning about 1800.
That said, it must be mentioned that the Santa Rita/Pinos Altos mining districts also produced large amounts of gold in locations other than the well known copper mine. There are even better legends of exceedingly rich recoveries and caches in the area, but let's just stick to the original topic.
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