The Arizona Transition Zone, sometimes referred to as the Central Highlands, is a northwest-trending belt or escarpment in the middle of the state that separates the Colorado Plateau to the north from ...
Once a bustling copper town, this rural Arizona community near Tucson now draws attention for its low costs, desert scenery, ...
The 270-acre area has been used as a sand and rock mining site by a tribal enterprise, Salt River Materials Group, since 1981 ...
James Colquhoun, a skilled metallurgist renowned for his innovation in porphyry copper production, started out as an assayer for the Arizona Copper Co. and also for non-company affiliates. He charged ...
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