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TROY RANCH

The Troy Ranch property is located near the
northern margin of Arizona's Basin and Range
province within the Dripping Spring Mountains,
Pinal and Gila Counties, Arizona. The Troy Ranch
property consists of 152 unpatented lode mining
claims and 4 Arizona Mineral Exploration Permits
that cover a total area of approximately 4,406
acres (1,783 hectares) in the Dripping Springs
(Troy) mining district. The property is subject
to a joint venture agreement entered in November
2005 between Big Bar and Phelps Dodge Exploration Corporation, a subsidiary of Freeport-McMoRan Copper & Gold Inc.
The Troy Ranch property is located about four
miles east-southeast of the Ray mine where ASARCO
is currently mining the giant Ray copper deposit
cluster, with reserves and production totaling
nearly 1.4 billion tons of ore at 0.75% copper.
The Troy Ranch area is located on the eastern
flank of the Dripping Spring Mountains, a small
but rugged range extending N45°W between
the Christmas and Ray copper deposits. Major
mining districts and copper deposits within
a 25-mile (7.6-kilometer) radius include Miami-Inspiration,
Superior, Ray and Christmas. Numerous smaller
deposits include those at Copper Butte, Chilito,
Copper Hills, and Monitor.
The primary exploration target at the Troy
Ranch property is commercial grade copper hosted
by Precambrian diabase associated wholly or
in part with the granodiorite/diabase intrusive
contact. The Troy Ranch exploration model is
analogous to the Ray Deposit and there may also
be targets on the property analogous to the
Christmas deposit. Diabase hosts most of copper
mineralization at the Ray copper mine, with
lower grade copper mineralization hosted by
the adjacent granodiorite intrusions.
Previous work by American Metals Climax (AMAX),
including detailed mapping and geochemical sampling
by Stan Keith identified a potential copper
deposit at depth. Nearby, a small copper resource
was drilled by Inspiration Copper Co. that appears
to be a part of the same mineral system. Historical
detailed geologic mapping by Stan Keith for
AMAX also identified a swarm of dikes with a
favorable copper-related composition that intrudes
various rock types, but the source intrusion
is covered by pre-mineral country rocks. The
country rocks include the same Precambrian diabase
unit that hosts the giant Ray Diabase orebody.
These rocks are largely covered by Paleozoic
sedimentary rocks. All of the pre-mineral rocks
exhibit an alteration pattern (expressed by
biotitically altered, locally
magnetite stable diabase) that points to the
presence of a significant copper mineral system
in diabase beneath the Paleozoic cover. Rock
sampling in the past revealed a geochemical
anomaly that is about 8,000 feet long and 2,500
feet wide characterized by elevated copper and
molybdenum values.
Highlights
of Big Bar’s current exploration program
at Troy Ranch include the following:
• Analysis of in-house historic geologic
mapping, pluton petrochemistry, and mineral
and metal assemblage data indicate that a Stage
3 MCA14C Morenci/Chuquicamata
model is present. Grade-tonnage for analog deposits
indicates excellent potential of a giant to
supergiant size porphyry copper-silver-molybdenum
accumulation.
• A diabase hosted target analogous to
the diabase orebody (1,383,000,000 tonnes at
0.75% copper of which a significant component
is hosted in diabase) at the nearby Ray ore
deposit has been identified based on detailed
geologic mapping and preliminary pluton vectoring.
• A high resolution photographic image
was obtained which was subsequently interpreted
for fracture orientation and density.
• A high resolution aeromagnetic survey
by an ultralight aircraft was conducted by Pearson,
deRidder and Johnson, Inc. in late November
2005 to support the pluton vectoring
and metal dispersion
study.
• Whole rock and mineralized samples
were collected in January 2006 for pluton
vectoring and metal
dispersion analysis to define
drill targets for a Stage 3 MCA14C
Morenci-Chuquicamata type porphyry
copper molybdenum silver deposit type.
• An AMT (audio magneto-telluric) Geophysical
Survey was conducted by Durango Geophysical
Operations in January 2006 to support the pluton
vectoring and the
metal dispersion study.
• Three preliminary targets are emerging
from the above work. The largest target (target
area 1) is about 2 miles long and ½ mile
wide, and is centered on the north and eastern
contact of the Troy pluton (see Photos 2 and
3). A smaller target (target area 2) is about
2/3 mile long and 1/3 mile wide, and it occurs
in the southwestern portion of the Troy pluton
and in the adjacent diabase. A third emerging
target of unknown size occurs north of a separate
granodiorite exposure in Dripping Springs wash.
All three targets coincide with AMT anomalies,
magnetic low features and preliminary pluton
vectoring and metal
dispersion data that indicate
the AMT anomalies coincide with Stage 3 geochemistry
and a potentially significant tonnage of diabase
hosted copper mineralization.
• The above combined data will be refined
into drill target designs. Drilling is expected
to commence in 2006.
TECHNICAL REPORT
February
3 2006: NI 43-101 Technical Report for the
Troy Ranch Property (10.7MB
File Download)
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