Heddleston Copper Project

Site Name

Primary: Heddleston Copper Project
Secondary: Heddleston Group
Secondary: Carbonate Mine - 0300490040
Secondary: Midnight Mine - 0300490284
Secondary: Paymaster Mine - 0300490242
Secondary: Anaconda Mine - 0300490146
Secondary: Mike Horse Mine - 0300490362
Secondary: Heddleston Deposit

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Commodity

Primary: Copper
Secondary: Silver
Secondary: Molybdenum
Secondary: Gold
Secondary: Zinc
Secondary: Lead

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Location

State: Montana
County: Lewis and Clark
District: Silver District

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Land Status

Land ownership: Private
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.

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Holdings

Type: Private Lease
Type: Located Claim
Type: Patented

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Workings

Type: Underground

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Ownership

Owner Name: Asarco (American Smelting And Refining Co.)
Company ID: 2401105
Percent: 100.0
Home Office: Washington
Info Year: 1984

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Production

Not available

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Deposit

Record Type: Deposit
Operation Category: Past Producer
Deposit Type: Porphyry Cu-Mo
Operation Type: Surface
Mining Method: Open Stope - Gophering (Coyoting)
Milling Method: Flotation
Year First Production: 1915
Discovery Year: 1898
Years of Production:
Organization:
Significant: Y

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Physiography

General Physiographic Area: Rocky Mountain System
Physiographic Province: Northern Rocky Mountains

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Mineral Deposit Model

Model Name: Porphyry Cu-Mo
Model Name: Porphyry Mo, low-F

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Orebody

Form: lenses and shoots

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Structure

Type: L
Structure: TWO NW-TRENDING FAULTS:MIKE HORSE FAULT&BLACKFOOT FAULT

Type: R
Structure: LEWIS THRUST FAULT

Type: R
Structure: LEWIS AND CLARK LINEAMENT

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Alterations

Alteration Type: L
Alteration: Seriticization

Alteration Type: L
Alteration: SUPERGENE

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Rocks

Name: Diorite
Role: Associated
Description: DIORITE
Age Type: Associated Rock
Age Young: Eocene

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Analytical Data

Not available

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Materials

Ore: Covellite
Ore: Chalcocite
Ore: Chalcopyrite
Ore: Molybdenite
Ore: Pyrite
Ore: Sphalerite
Ore: Galena
Ore: Arsenopyrite
Ore: Bornite
Ore: Tetrahedrite
Gangue: Feldspar
Gangue: Plagioclase
Gangue: Quartz
Gangue: Biotite

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Comments

Comment (General): This deposit was centered around the Mike Horse Mine. Exploration was for large tonnage porphyry copper deposit, while original mining was of lead, gold,copper, and silver. Some information from the Mike Horse property has been consolidated into this record.

Comment (Production): TOTAL EST. PROD. OF DISTRICT $120,000, HALF WAS PB REST AU, AG, CU

Comment (Reserve-Resource): Current drill-indicated resource estimate of 125 million tons of ore at .49% Cu, .015% Mo and .15 opt Ag. (Potential to add at least another 50 million tons of ore to resource at peripheral areas is reported in sale papers.)

Comment (Workings): Anaconda completed extensive RC, core and churn drilling of the project in the 1960?s and Asarco continued a drilling program into the 1990?s. (358 holes with over 250,000 feet of churn, RC and diamond drilling)

Comment (Production): PRODUCTION AND DEVELOPMENT reported from 1940 TO 1952 at Mike Horse mine.

Comment (Economic Factors): APPROXIMATELY $25,000,000 PRODUCED FROM 1889 TO 1958 OF LEAD, ZINC, COPPER, SILVER, AND GOLD (MILLER AND OTHERS, 1973). ?THE U.S BUREAU OF MINES HAS CREDITED THIS DISTRICT WITH A PRODUCTION OF ABOUT $11.6 MILLION, WITH THE BULK OF THE VALUE COMING FROM THE MIKE HORSE MINE.? (MCCLERNAN, 1983) RESERVES (EYDE, 1972): DEVELOPED- 20 MILLION TONS @0.53 CU, 0.01 TO 0.015% MO AND 0.15 OPT AG PROBABLE- 40 MILLION TONS @0.51 CU, ? MO, 0.15 OPT AG MARGINAL ORE 30 MILLION TONS @0.32% CU, ? MO, AND 0.15 OPT AG POSSIBLE ORE 30 MILLION [email protected]% CU, ? MO, AND 0.15 OPT AG

Comment (Names): MIKE HORSE, ANACONDA, MIDNIGHT, CARBONATE AND PAYMASTER ARE NAMES OF PATENTED CLAIMS, VEINS AND MINES.

Comment (Workings): WORKINGS IN 1933 INCLUDED 3 ADITS, TUNNELS 1, 2, AND 3, SPACED THROUGH A VERTICAL RANGE OF ABOUT 300 FT.

Comment (General): The Heddleston Copper Project consists of approximately 41 patented lode mining claims and 189 unpatented claims.

Comment (General): This is the full text of the PDF reference. An aerial photos is missing from this description. Heddleston Copper Project, Lewis and Clark County, Montana ASARCO, Incorporated is offering for sale its Heddleston Copper Project in Lewis and Clark County, Montana. The Heddleston Project is located in west central Montana, about 50 miles NW of Helena, and consists of a major Cu-Mo porphyry deposit. The mineralization is a chalcopyrite-molybdenite Eocene instrusive complex which cuts Proterozoic belt sediments. The primary mineralization has been weathered and enriched, and at the surface consists of a chalcocite blanket overlying chalcopyrite. The project consists of approximately 41 patented lode mining claims and 189 unpatented claims. Anaconda completed extensive RC, core and churn drilling of the project in the 1960?s and Asarco continued a drilling program into the 1990?s. INVESTMENT HIGHLIGHTS: ? Total drilling database of 358 holes with over 250,000 feet of churn, RC and diamond drilling ? Current drill-indicated resource estimate of 125 million tons of ore at .49% Cu, .015% Mo and .15 opt Ag ? Potential to add at least another 50 million tons of ore to resource at peripheral areas ? Open pit minable resource combined with SXEW processing facilities ? Metallurgical testwork demonstrates 60% leach recoveries from chalcocite ores Exclusively represented by: Andrew A. Brodkey Managing Director T 520.323.5120 [email protected] www.cbre.com/imm John T. Perry Vice President & Director T 520.323.5158 [email protected] www.cbre.com/imm

Comment (Reserve-Resource): COPPER PRIORITY. ONE DRILL HOLE - NO OTHER DATA.

Comment (Deposit): REC-040 27 MILES OF EXPLORATION/DEVELOPMENT ROADS CONSTRUCTE THAN 1 MILE OF GRAVELLED ROAD ACCESSES THE PROPERTY. MAKE UP WATER CAN BE SUPPLIED FROM WELLS LESS THAN 2 MILES DISTANT. A TRANSMISSION LINE LEADS TO THE PROPERTY FROM HWY 2 MILES DISTANT. REC-080 ATTITUDE AND DIMENSIONS PERTAIN TO THE MINERALIZED Z CONTAINED SECONDARY ENRICHED MINERAL DEPOSITS COMPRI HEDDLESTON COPPER-MOLYBDENUM PROPERTY. RECS-101-105 RESERVES/RESOURCES OF COMBINED DEPOSITS-ANACOND ESTIMATE. MILL RCVY ASSUMD. -84% CU, 53% MO. MILL CONC. ASSUMD.-25% CU, 57% MO. REC 160-161 CONC. DESTINATION-ANACONDA (217 KM). ASARCO ACQUIRED THE PROPERTY IN 1982. SINCE THAT TIME, ASSESSMENT WORK. THE COMPANY HAS NO PLANS TO PUT THE PROERTY INTO PRODUCTION IN THE NEAR FUTURE. IN SECTION 21 AND ALSO SECTION 29.

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References

Reference (Deposit): ROBERTSON, F., 1956, GEOCHEMICAL PROSPECTING BY SOIL ANALYSES IN MT, MT BUREAU OF MINES & GEOLOGY BULL. 7.

Reference (Deposit): PARDEE, J.T. AND SCHRADER, F.C., 1933, METALLIFEROUS DEPOSITS OF THE GREATER HELENA MINING REGION: USGS BULL. 842, 318 p.

Reference (Deposit): MELSON, W.G., 1964, GEOLOGY OF THE LINCOLN AREA, MONTANA AND CONTACT METAMORPHISM OF IMPURE CARBONATE ROCKS: PH. D. DISSERTATION, PRINCETON UNIVERSITY, 153 P.

Reference (Deposit): RICHMOND, R.C., 1975, GEOLOGICAL EXPLORATION IN THE HEDDLESTON DISTRICT, MONTANA. PROCEDDINGS OF THE 1973 PACIFIC NWMINING AND METALS CONFERENCE, APRIL 1973. MONT. BUREAU OF MINES AND GEOL. BULLETIN 95, P. 14.

Reference (Deposit): LAWSON, D.C., 1975, DIRECTORY OF MINING ENTERPRISES FOR 1974: MBMG BULLETIN 95, P. 14.

Reference (Deposit): MILLER, R.N. SHEA, E.P., GODDARD, C.C. JR., POTTER, C.W., AND BROX, G.B., APRIL 1973, GEOLOGY OF THE HEDDLESTON COPPER-MOLYBDENITE DEPOSIT, LEWIS AND CLARK COUNTY, MT.: PROCEEDINGS OF THE 1973 PACIFIC NW MINING AND METALS CONFERENCE; American Institute of Mining, Metallurgical and Petroleum Engineers, Coeur d'Alene, Idaho.

Reference (Deposit): MCCLERNAN, H.G., 1983, METALLIC MINERAL DEPOSITS OF LEWIS AND CLARK COUNTY, MONTANA: MBMG MEMOIR 52, 73 P.

Reference (General): http://www.cbre.com/NR/rdonlyres/B8A28904-58AE-4CD5-B26A-BBD8289AF853/479303/HeddlestonTeaser.pdf (Information provided to prospective buyers of the property).
URL: http://www.cbre.com/NR/rdonlyres/B8A28904-58AE-4CD5-B26A-BBD8289AF853/479303/HeddlestonTeaser.pdf

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Principal Gold Districts of Montana

In Montana, 54 mining districts have each have produced more than 10,000 ounces of gold. The largest producers are Butte, Helena, Marysville, and Virginia City, each having produced more than one million ounces. Twenty seven other districts are each credited with between 100,000 and one million ounces of gold production. Read more: Principal Gold Districts of Montana.