Ahtna
Minerals Company, a Subsidiary of Ahtna, Incorporated
MINERAL EXPLORATION OPPORTUNITIES

TABLE OF CONTENTS
- Executive
Summary
- Introduction
- Ahtna
Corporate Profile
- Land
Status
- Location,
Physiography, Access
- Exploration
and Mining History
- Regional
Geology
- Metallic
Mineral Deposits and Mineral Potential
8.1 Deposits
8.2 Potential
8.2.1 Lichen Greenstone Belt
8.2.2 Slana
8.2.3 Mentasta
8.2.4 Southern Copper River
8.2.5 Old Kennicott Trend
8.2.6 Tonsina Ultramafic Trend
8.2.7 Cantwell
9.
Summary
10. Agreement Terms
11. Conclusion
12. References
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Here To View "Mineral Deposit Chart"
1.0 EXECUTIVE SUMMARY
Ahtna Incorporated is one of Alaska's twelve Native Corporations that
were granted land entitlements under the Alaska Native Claims Settlement
Act (ANCSA) in 1971. The company owns 1,528,000 acres and upon completion
of the land selection process will own 1,777,000 acres. Ahtna seeks
to develop mineral resources on its lands and actively encourages mining
companies to explore, develop and mine minerals in the region.
Ahtna's lands were selected to a large degree on mineral resource
potential as perceived from public data and proprietary data generated
from Ahtna-sponsored exploration programs. The incredibly rich Kennicott
copper deposits attest to the ability of the region to host world-class
mines. Mineral terranes permissive and prospective for bulk-minable-tonnage
and high-grade vein gold deposits; volcanogenic, syngenetic, sediment-hosted
polymetallic deposits; carbonate-hosted replacement and epigenetic
deposits; and a range of skarn and porphyry deposits are present.
Exploration and mine development on Ahtna lands in Alaska has the
following advantages:
- strong
mineral resource potential
- secure
land tenure
- enormous
land tracts covering entire mineral belts,
- low degree
of prior exploration,
- best
infrastructure development and accessibility of any Native land holdings
in the state, and
- pro-mining,
pro-resource, pro-development corporate management.
The following report provides a glimpse at Ahtna's tremendous mineral
resource potential, and briefly describes geographic, economic and
political considerations. The company believes that its lands should
be highly rated on the global scale of exploration opportunities. Companies
interested in exploring and developing mines on Ahtna land are encouraged
to learn more. The company will make all private and public data pertaining
to Ahtna lands available to interested parties and can assist with
site inspection and evaluation. Ahtna will work with mining companies
to make their projects successful.
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2.0 INTRODUCTION
The following report outlines the regional geological setting of Ahtna
Incorporated (Ahtna) lands in the context of mineral resource potential,
and provides an overview of prospective mineral terranes and documented
mineral deposits and occurrences in the region. Economic and political
considerations are also reviewed. The report is intended as an introduction
to the mineral potential of the Ahtna region and the company that holds
title to much of the land in the area. The attached map depicts all
major geographic and land status features, as well as mineral deposits,
occurrences and terranes referred to in the report.
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3.0 AHTNA CORPORATE PROFILE
Ahtna is one of twelve Alaska Native Regional Corporations established
by Congress under the terms of the Alaska Native Claims Settlement
Act (ANCSA) in 1971. There are approximately 1100 shareholders, most
of whom reside in the Copper River region. The company derives revenue
from subsidiary corporations active in the fields of pipeline maintenance,
construction, catering, janitorial services, security services and
telecommunications.
The regional corporation holds title to enormous tracts of land that
were selected to a large degree for their potential to host mineral
deposits. Ahtna seeks to develop this tremendous resource asset. In
1978 a subsidiary, Ahtna Minerals Company, Inc. (AMC) was formed to
manage and promote corporate growth through development of the parent
company's mineral resources. AMC wishes to lease mineral lands to mining
companies for exploration, development and mining. The main objectives
are to:
- increase
the parent corporation's profitability through mining-related
revenues,
- provide
shareholder employment opportunities in exploration, development
and mining operations and related service industries,
and
- provide
contract opportunities for qualified Ahtna subsidiaries and their
joint venture businesses.
Ahtna believes that a strong economic base provides shareholders with
the ability to preserve their Native culture. Responsible development
of Ahtna's mineral resources is seen as a means to this end.
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4.0 LAND STATUS
The regional corporation and affiliated village corporations own outright
the surface and subsurface estate to 1,528,000 acres of land. Upon
completion of the land selection process Ahtna will own 1,777,000 acres.
Conveyance of the balance of 249,000 acres will be taken from a pool
of approximately 1,500,000 acres of selected lands.
Approximately one-half of the company's selected and conveyed lands
are situated in the northwest portion of the Ahtna region. Permission
to access and explore conveyed lands is granted through the regional
corporation and associated village corporations. Ahtna-selected lands
in this area are administered by the Bureau of Land Management (BLM).
The remainder of Ahtna's conveyed and selected lands occur as in-holdings
near the western boundary of the Wrangell-St Elias National Park and
Preserve. These lands, while owned or selected by Ahtna, are under
the jurisdiction of the National Park Service (NPS). Permitting of
exploration activity is done by this agency but is handled by Ahtna
on behalf of mining companies. The fact that some of Ahtna's lands
are situated within the boundaries of a national park should not be
viewed as a deterrent to developers of mineral resources. The company
has the right of access, guaranteed by an act of Congress, to any mineral
deposits located on Ahtna-owned lands within the park boundaries. Because
of the sensitive nature of the setting, greater care and sensitivity
to environmental issues must be taken, and a more arduous permitting
process is to be expected.
Please refer to the attached Ahtna Regional Land Status Map for details.
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5.0 Location, Physiography, Access
The Ahtna region covers an enormous expanse of land spanning an area
from the village of Cantwell southwestward to the Canadian border in
south-central Alaska. Much of the region is inaccessible due to steep
mountainous terrain and extensive alpine glaciers.
In the
eastern half of the Ahtna Region, the Wrangell Mountains form the
heart of
the Wrangell St. Elias National Park. About 45% of Ahtna’s
selections and conveyed lands form an arc on either side of the park
boundary, following the Copper River from Nabesna in the north to McCarthy/Kennicott
in the south. The most mineral-prospective tracts are situated near
Nabesna and McCarthy, and are reasonably near the road system.
In the western half of the Ahtna Region, two other mountainous sections
are bisected east to west by the Copper Basin plateau, a sedimentary
basin of low relief. The Alaska Range and the Mentasta Mountains bound
the north side of the Copper Basin. The known mineral occurrences in
these ranges are within reasonable distance of the Alaska highway grid,
and those near Cantwell have access to the Alaska Railroad and the
Anchorage-Fairbanks power intertie. On the south side of the Copper
Basin, the Chugach and St. Elias Mountains occupy a position along
the southern margin of the region. The eastern portion of this sub-region
is within the Wrangell-St. Elias National Park. Ahtna owns no land
in this area. The western portion of this area contains a number of
selections along the northern front of the Chugach Mountains.
Most of the Ahtna selected and conveyed lands cover moderate to gentle
terrain. The lands are in the most accessible portion of the state
adjacent to major transportation corridors. The Richardson, Glenn and
Denali highways provide access to port facilities and service industries
at major population centers. Ahtna maintains its headquarters in Anchorage,
and also Glennallen which lies 160 miles by road from Anchorage. Fairbanks
lies 230 road-miles to the north. The Port of Valdez is 85 miles south
of Glennallen along the Richardson Highway. The Alaska Railway passes
through the northwestern portion of the region near the town of Cantwell
and leads to the ports of Anchorage and Seward. The Anchorage-Fairbanks
Intertie high voltage electrical power grid also passes by Cantwell.
The Ahtna region is covered by portions of the Gulkana, Valdez, McCarthy,
Nabesna, Bering Glacier, Anchorage, Talkeetna Mountains, Healy, Mount
Hayes and Tanacross quadrangle maps published by the United Sates Geological
Survey (USGS).
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6.0 EXPLORATION AND MINING HISTORY
1884
- 1939: The first mineral prospecting occurred in the area in
1884. The region experienced a large influx of prospectors and miners
in the late 1800's as a result of the Klondike Gold Rush. A number
of placer gold deposits were discovered and exploited. The Kennicott
(stratiform copper-silver) and Nabesna (gold-bearing skarn) mines were
discovered during this period as were the Elliot Creek, Berg Creek,
Clear Creek and Copper Creek prospects. Most mining activity in the
region had ceased by the onset of World War II.
1950
- 1970: Sporadic exploration for porphyry and breccia-type copper-molybdenum
deposits was carried out.
1971
- 1977: ANCSA was passed in 1971 and Ahtna began the process
of selecting lands. No mineral exploration of note was carried out
during this period.
1977
- 1979: A three-year reconnaissance exploration program was undertaken
by three companies in joint venture with Ahtna. The joint venture was
coordinated by WGM Inc., an Anchorage-based consulting firm. This company
also acted as project manager and carried out the multi-year program
with a total budget of approximately $2 million. The program consisted
primarily of stream-sediment sampling, prospecting, reconnaissance
mapping and rock sampling. Exploration was directed toward porphyry
copper-molybdenum, uranium and volcanogenic massive sulfide environments.
The program was successful in identifying a number of mineralized terranes,
and aided Ahtna in the process of land selection.
Alaska Mineral Resource Assessment Program (AMRAP) studies were carried
out by the USGS in the Nabesna, McCarthy and Valdez quadrangles. These
are integrated studies that resulted in the publication of geochemical,
mineral occurrence and geological data.
1980
- present: Cominco investigated the Slana District in the vicinity
of the Ahtell Pluton in the early 1992, and performed reconnaissance
in the Mentasta Mountains in 1992-94. Homestake Mining Company acquired
claims in the Slana area in 1997 adjacent to Ahtna land holdings. A
program consisting of reconnaissance mapping and sampling was carried
out. The target in both cases was gold-copper mineralization associated
with dioritic intrusions.
Noranda Exploration, Inc. carried out reconnaissance mapping and geochemical
sampling in the Alphabet Hills area in 1981. The target was massive
sulfides and precious metals associated with a Paleozoic volcanic belt.
Geneva Pacific Mining and Conoco carried out exploration programs
at the Nelson Mountain, Berg-McDougall and Clear Creek - Porcupine
Creek areas in the early 1980's.
In 1997, the BLM began a multi-year mineral assessment of Ahtna lands
that lie within Wrangell-St. Elias National Park and Preserve. The
study was carried out at the request of the NPS. The NPS wishes to
provide comprehensive minerals information to Ahtna so that the company
may relinquish over-selections within the park boundaries.
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7.0 Regional Geology
The Ahtna region is underlain by a collage of Paleozoic and Mesozoic
volcanic arc rocks, comagmatic hypabyssal intrusions, and marine volcanoclastic
and sedimentary rocks, Mesozoic flysch-basin deposits and younger late
Mesozoic and Cenozoic sedimentary, volcanic and plutonic rocks.
The Wrangellia Terrane underlies much of the Ahtna region. This terrane
is an extensive package of rocks extending from Alaska to the southern
tip of British Columbia, and it includes the Taku-Skolai Arc. These
arc rocks formed outboard of the continental margin and accreted to
ancestral North America in the late Cretaceous. The Denali Fault bounds
Wrangellia to the north and east, abutting it with the Devonian Yukon-Tanana
Terrane. A diverse array of lithological units comprise the terrane.
Compressional tectonics have affected Wrangellia with increasing intensity
northward to the Denali Fault, which is a major crustal suture and
tectono-stratigraphic boundary that extends from southeast Alaska to
the Bering Sea. Wrangellia has undergone greenschist facies metamorphism,
with local amphibolite facies near terrane-bounding faults. Numerous
Mesozoic subduction-related granitic plutons intrude the arc sequence.
Widespread volcanic deposits of Tertiary and Quaternary age uncomformably
overlie the older rocks. Surficial glacial deposits are present throughout
the area and locally attain significant thickness.
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8.0 Metallic Mineral Deposits and Mineral Potential
8.1 Deposits
As a result of the diverse underlying geology, the Ahtna region is
host to a large array of metallic mineral deposits, and indeed some
unique deposit types. However, metallic lode deposits in the Ahtna
region can be roughly divided into two main types:
- Those
Paleozoic and Mesozoic deposits formed by syngenetic, diagenetic
and early epigenetic processes related to arc-forming events at and
beneath the sea floor in outboard terranes (volcanogenic
massive sulfide
(VMS), SedEx, magmatic and replacement deposits); and
- Those
formed by late Cretaceous post and syn-accretionary subduction-related
magmatic events (variety of skarns, porphyry and vein deposits).
The BLM has documented mineral occurrences situated on Ahtna lands
that lie within Wrangell-St. Elias National Park and Preserve. A total
of 55 occurrences situated on or near Ahtna selections were included
in the assessment. Of the 55 occurrences, nine are historically-producing
dormant mines, 27 are development prospects, and the remainder are
exploration prospects of varying importance. Eight of the occurrences
are placer gold deposits. The preliminary results of the ongoing investigation
are documented in BLM-Alaska Open File Report 71 (Meyer and Shepard,
1998). Follow-up results are documented in BLM-Alaska Open File Report
73 (Meyer and VandeWeg, 1999). Each occurrence is described in detail
in the reports. Ahtna will supply copies of the reports on request.
Numerous
mineral occurrences lying outside the Wrangell-St. Elias Park boundaries
are also present, and many occur on Ahtna lands. Information
on these prospects can be obtained from Ahtna, the USGS or the
Alaska Department of Natural Resources.
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8.2 Potential
While some very significant deposits have been discovered, the region
has seen very little exploration. The reconnaissance program carried
out by WGM in the late 1970's is the most comprehensive completed to
date. The program barely began the mineral assessment process, however
it was successful in the identification of six main mineral belts.
A synopsis of the WGM descriptions follows:
8.2.1 Lichen Greenstone Belt:
A volcanic belt with potential for discovery of massive sulfide deposits
is indicated. Stream-sediment reconnaissance surveys identified an
area in excess of 40 miles long in which anomalous copper results
were obtained. Numerous polymetallic massive sulfide occurrences
are noted throughout the belt.
8.2.2
Slana:
Intrusive-related bulk-minable and epithermal gold deposit potential
is indicated. Numerous strong gold anomalies from stream-sediment
samples were detected in three different areas draining diorite
and quartz-diorite intrusive complexes. Broad alteration zones
are reported.
8.2.3 Mentasta:
Intrusive-related bulk-minable and epithermal gold deposits, polymetallic
vein deposits, VMS, porphyry copper-molybdenum and gold skarn deposit
potential is indicated. Numerous multi-element stream sediment anomalies
are reported.
8.2.4 Southern Copper River:
Vein, skarn, VMS and sediment-hosted (SedEx?) massive sulfide deposit
potential is indicated. Numerous sulfide showings at Nelson Mountain
carry very strong zinc values. Gold-copper-silver skarn mineralization
is documented at the Berg-McDougall occurrence.
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8.2.5 Old Kennicott Trend:
Kennicott-type copper mineralization in Chitistone Limestone and underlying
Nikolai Flood Basalts occurs on Ahtna lands. There is potential for
discovery of more carbonate-replacement copper deposits, as well
as potential gold-copper skarns and porphyry copper-molybdenum deposits.
8.2.6 Tonsina Ultramafic Trend:
Mafic and ultramafic rocks of the Tonsina Complex are exposed in four
low-lying hils to the east of the Richardson Highway: Scarp Mountain,
Sheep Hill, Dust Mountain, and Bernard Mountain. Anecdotal evidence
of PGM occurrence is found in local names including Chrome Creek
and Platinum Creek. Reconnaissance geologic mapping and sampling
affirm the existence of chrome, platinum, and palladium in this trend.
8.2.7 Cantwell:
The WGM surveys detected anomalous values from stream sediments in
the following metals: copper, molybdenum, lead, tungsten, tin and
uranium. The anomalous values were obtained from streams draining
felsic intrusions and fractured-controlled sulfide mineralization
was discovered during follow-up surveys. Recently, a major mining
company sampled one of the rare outcrops along the highway and obtained
highly anomalous gold assays associated with altered intrusives.
This area is close to the Golden Zone, a gold-copper breccia-pipe
deposit. Ahtna lands in the area hold potential for this type of
deposit.
8.2.8 Eagle Trend and the North Side of Denali Fault:
Reconnaissance by WGM identified several base metal anomalies in the
northeast corner of the Ahtna Region, on the north side of the Denali
Fault.
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In an area northwest of the Ahtna region recent exploration by mining
companies has resulted in the discovery of nickel-copper-platinum-palladium
mineralization. The showings occur in mafic-ultramafic complexes that
served as sub-volcanic feeders to the Nikolai Flood Basalts. A Noril'sk
analogue may be indicated. Wrangellian Flood Basalts occur on Ahtna
lands as well. Potential for this deposit type may exist.
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9.0 SUMMARY
Based
on the BLM mineral occurrence documentation, Alaska Department of
Natural Resources mineral occurrence information, the WGM investigations
and a review of mineral terrane information in general it is
apparent
that potential for the following metal-deposit / commodity-types
exists: - bulk-minable-tonnage
and high-grade epigenetic gold deposits,
- placer
gold,
- precious-metal-enriched
polymetallic base-metal volcanogenic massive sulfide deposits,
- SedEx
zinc-lead-silver deposits,
- carbonate-hosted
replacement and epigenetic base-metal deposits,
- sandstone-hosted
copper deposits,
- magmatic
nickel-copper-platinum-palladium deposits, and
- skarns
and porphyry deposits.
Of the
above-listed deposit types, the high-unit-value base and precious-metal
deposits and the bulk-minable-tonnage gold deposits comprise the
most attractive exploration targets in the prevailing mining economic
climate and commodity-demand regime. Gold deposits were not a target
sought in the WGM surveys. The presence
of Cretaceous intrusions and historic placer gold production indicates
that potential for bulk-minable-tonnage gold and epithermal vein
deposits exists. Virtually no work has been done to evaluate this
potential.
Ahtna lands are underlain by geological sequences that have produced
enormous mineral wealth elsewhere in the Cordillera. On this basis
alone, Ahtna lands clearly have strong mineral potential. The presence
of numerous deposits and occurrences, some of extreme value such as
Kennicott, underlines the importance of the region. The fact that there
have been relatively few mineral deposits discovered in comparison
to the southern part of the Cordillera is simply a function of the
degree of exploration that has been carried out. Ahtna lands have outstanding
potential for discovery of ore bodies.
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10.0 agreement Terms
Ahtna will grant mining companies the exclusive right to explore, develop
and mine on specific land tracts that have demonstrated mineral potential
under the terms of an Exploration and Option to Lease Agreement.
Ahtna does not currently have any active mineral agreements. The company
would therefore consider favorably an arrangement whereby a mining
company or a consortium would be provided the exclusive right to explore
in a reconnaissance fashion all Ahtna selected and conveyed lands,
with the option to select specific tracts of land for lease and detailed
exploration or development.
Ahtna expects to see the following components to any Exploration and
Option to Lease Agreement:
· signing
bonus,
· scholarship fund contributions,
· escalating work commitment,
· production royalty,
· advance minimum royalty payments,
· shareholder hire and contract preference,
· option to participate at feasibility stage,
· vocational training, and
· electronic and printed copies of all data generated.
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11.0 Conclusion
Upon completion of the selection process Ahtna will own 1,777,000
acres of land covering ground with excellent mineral potential. There
are indications of deposits of the following affinity: - bulk-minable-tonnage
and high-grade vein gold deposits,
- placer
gold,
- precious-metal-enriched
polymetallic base-metal volcanogenic massive sulfide deposits,
- SedEx
zinc-lead-silver deposits,
- carbonate-hosted
replacement and epigenetic deposits,
- sediment-hosted
copper deposits,
- Magmatic
copper-nickel-platinum-palladium deposits, and
- skarns
and porphyry deposits.
The property owned by the company has received only cursory mineral
exploration efforts. Much more reconnaissance work is required to delineate
established mineral terranes, and to identify as-yet unrecognized terranes.
Nevertheless, strong targets that can quickly be moved to an intermediate
or advanced exploration stage exist. Modern exploration methods, economic
and deposit-model concepts have not been applied in the region.
Most of Ahtna's mineral lands are situated close to major transportation
corridors and infrastructure. Target economics are therefore excellent
by Alaska standards.
Ahtna wants to develop mines on its lands and welcomes mining companies
to explore them. Responsible explorers, developers and miners operating
with sensitivity to Native heritage, culture, environment and traditional
ties to the land will receive this native group's full support in every
aspect of the business.
For all of these reasons - technical, economic and political - Ahtna
lands are an attractive exploration target.
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References:
Meyer, M.P. and Shepherd, A.D. (1998): Mineral Assessment of Ahtna,
Inc. Selections in the Wrangell-St. Elias National Park and Preserve,
Alaska; 1997 Preliminary Report; Open File Report 71, Bureau of Land
Management, Alaska State Office.
Meyer, M.P. and VandeWeg, D.A. (1999): Mineral Assessment of Ahtna,
Inc. Selections in the Wrangell-St. Elias National Park and Preserve,
Alaska; 1998 Preliminary Report; Open File Report 73, Bureau of Land
Management, Alaska State Office.
Plafker, G. and Berg, C. (1994): The Geology of Alaska, The Geological
Society of America publication, The Geology of North America, Vol.
G-1
WGM Inc. (1979-1981): Exploration Program, Ahtna Region.
Foley, J.Y., Mardock, C.L., and Dahlin, D.C. (1986): Platinum Group
Elements in the Tonsina Ultramafic Complex, Southern Alaska; Process
Minerology VII: Applications to Mineral Beneficiation Technology and
Mineral Exploration; Proceedings of a symposium on Process Mineralogy
held during the Metallurgical Society Annual Meeting, Denver, Colorado,
February 23-27, 1987.
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