This adit is believed to have been driven by the Copper Queen Consolidated Mining Company between 1909-1912 to explore the Sacramento hill porphyry. The portal was located on the northern side of Sacramento Hill at about 5370ft. in elevation. (across the hill from the machine shop) During the Holbrook Extension of the Lavender pit this area was mined out.
Dumps of the phelps tunnel on Sac hill
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Map of the Phelps Tunnel (in red)