Description:
Brief summary of geological features and known mineral occurrences
Wilderness Study Areas 4-14, 4-16
Fishhook - Day Mine
1) The Fishhook - Day Mine areas are underlain by middle - to -
upper Tertiary age volcanic flows, breccias, and tuffs, and
by late Tertiary-Quaternary basin-fill deposits, primarily
of alluvial and lacustrine origin (sands, gravels, etc.);
2) The WSA's do not contian any known base or precious metal
occurrences;
3) Secondary copper mineral deposits have been reported from
fissure veins in middle Tertiary volcanic rocks along the
western and southern borders of the WSA's. Other copper
deposits are located several miles to the south of WSA
4-16. No production has been recorded from exploration
prospects in these areas;
4) Minor occurrences of gold, silver, lead, zinc, and molybdenum
are associated with the copper deposits. Mining
claim reports indicate that mineral amounts are insufficient
to be of economic value;
5) One known occurrence of manganese is located to the south
of WSA 4-16 in middle Tertiary volcanic rocks. There are
no reports of production;
6) Information concerning mineral types, claim development,
and ore production is unavailable for other prospects
in this region;
7) The Safford - Lone Star Mining District, to the south of
the WSA's, has been actively mined and prospected since
the late 1800's.