El Chino Copper Mine
El Chino CopperMine |
Location: Santa Rita, New Mexico, United States.
Products: Copper Deposit.
Ore Type: Porphyry copper deposit with
adjacent copper skarn deposits.
Host
rocks: The predominant oxide copper mineral is chrysocolla.
Chalcocite is the most important secondary copper sulfide mineral, and
chalcopyrite and molybdenite
the dominant primary sulfides.
Geological
setting: The Cobre
Mountains are composed of Proterozoic metamorphic and igneous rocks covered by
about 3800 to 4800 feet of Paleozoic to Mesozoic sedimentary rocks. Cretaceous
diorite to quartz diorite sills subsequently intruded these older rocks.
Shortly thereafter, mafic to intermediate composition dikes and other intrusive
bodies were emplaced and 2000 feet of intermediate composition lavas and breccias
were erupted onto the surface. Next, the large granodioritic
plutons at Chino and at Hanover-Fierro to the north were intruded. The last
stage of intrusive activity in this area was the emplacement of rhyolitic
dikes. The multiple intrusions locally domed and folded the older Paleozoic and
Cretaceous strata.
Mineralization: Porphyry
copper deposit are low-grade (<0.8%) disseminated deposits of copper
found in and around small intrusive bodies composed of porhyritic
diorite, granodiorite, monzonite or quartz monzonite (McLemore, 2008). The
small plutons (also called stocks) are often shallowly emplaced at depth within
1 to 6 km of the earth's surface. The copper occurs within breccia or in
networks of fractures, both in the porphyritic intrusion and in the adjoining
country rocks.
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