1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Miami East

Past Producer in Gila county in Arizona, United States with commodities Copper, Gold, Molybdenum, Silver
Map
XML
JSON
KML
A
Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Alteration
  9. Mineral occurrence model information
  10. Host and associated rocks
  11. Nearby scientific data
  12. Geologic structures
  13. Ore body information
  14. Controls for ore emplacement
  15. Economic information about the deposit and operations
  16. Mining district
  17. Mineral rights holdings
  18. Land status
  19. Ownership information
  20. Production statistics
  21. Reserves and resources
  22. Workings at the site
  23. Links to other databases
  24. Bibliographic references
  25. General comments
  26. Reporter information

Geologic information

Identification information

Deposit ID 10184420
MRDS ID M003084
MAS/MILS ID 0040070051
Record type Deposit
Current site name Miami East
Alternate or previous names Miami Property, Miami Pit, Miami Concentrator, Miami Leach, Magma No. 2 Tailings, Miami No. 2 Tailings, Old Dominion, Old Miami, Miami Tailings

Geographic coordinates

Point of reference Main Entrance
Geographic coordinates: -110.87569, 33.40698 (WGS84)
Elevation 1100
Location accuracy 100(meters)

Site location context

Political divisions (FIPS codes)

Gila(county)

Arizona(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Inspiration(quadrangle 1:24,000 scale)

Globe(quadrangle 1:100,000 scale)

Mesa(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Salt(hydrologic unit)

Salt(hydrologic accounting unit)

Salt(hydrologic subregion)

Lower Colorado(hydrologic region)

Geographic areas

Country State County
United States Arizona Gila

Public Land Survey System information

Meridian Township Range Section Fraction State
Gila and Salt River 001 N 015 E 30 NE Arizona

Commodities

Commodity Importance
Copper Primary
Gold Secondary
Molybdenum Secondary
Silver Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Molybdenite Ore
Galena Ore
Pyrite Ore
Gold Ore
Silver Ore
Azurite Unknown
Bornite Unknown
Chalcocite Unknown
Chrysocolla Unknown
Copper Unknown
Covellite Unknown
Cuprite Unknown
Malachite Unknown
Quartz Unknown
Sericite Unknown

Alteration

  • (Local) Silicate Alteration: Potassic, Argillic, Sericitic, And Propylitic

Mineral occurrence model information

Model code 53
USGS model code 17
Deposit model name Porphyry Cu
Mark3 model number 4

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Quartz Monzonite
    Rock type qualifier multiple phase-predominantly a porphyritic quartz-monzonite (adamellite), includes granodiorite and later phase granite porphyry
    Rock unit name Schultze Granite
    Stratigraphic age (youngest) Paleocene
  • Host or associated Host
    Rock type Metamorphic Rock > Schist
    Rock type qualifier sequence of coarse grained quartz-muscovite schist, fine grained quartz-sericite-chlorite schist and some fine grained amphibole schist
    Rock unit name Pinal Schists
    Stratigraphic age (youngest) Mesoproterozoic

Nearby scientific data

Main Entrance (1) -110.87569, 33.40698
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure name Eastward Dipping Normal Faults Steeply Dipping Joints Trending NE and NW

Ore body information

  • Strike N72E
    Dip 34N
    Thickness 72M
    Length 920M
    Width 427M
    Depth to top 760M
    Field Value
    MAS Matrix # 1
    MAS Column # 1
    Type of Orebody #1 DISSEMINATED
    Shape of Orebody #1 MASSIVE
    Primary mode of Origin HYDROTHERMAL
    Secondary mode of Origin OXIDATION
    Primary Ore Control IGNEOUS
    Secondary Ore Control OTHER
    Degree of Wallrock Alter. UNKNOWN
    Type of Wallrock Alter. #1 UNKNOWN
    Strike And Dip N72E:34N
    Avg. Thick. Unconsol. Mat. 1
    Min. Thick. Unconsol. Mat. 0
    Date of Last Modification 830728
  • Area 81HA
    Field Value
    Total Surface Area (HA) 81
    Date of Last Modification 910418
  • General form ore minerals: Chalcocite
    class of ore: sulfide, oxide
    lithostratigraphic unit: gila conglomerate
    Length 335.5M
    Width 76.25M
    Depth to bottom 915M
  • General form Type of Orebody #1 : DISSEMINATED
    Shape of Orebody #1 : MASSIVE
    Type of Orebody #2 : FISSURE VEIN
    Primary mode of Origin : HYDROTHERMAL
    Primary Ore Control : IGNEOUS
    Secondary Ore Control : FAULTING
    Degree of Wallrock Alter. : MODERATE
    Type of Wallrock Alter. #1 : INTERM ARGILLIC Date of Last Modification : 830502
    Thickness 180M
    Length 1130M
    Width 760M
  • General form Total Surface Area (HA) : 200Date of Last Modification : 910418
    Area 200HA
  • General form Total Surface Area (HA) : 85
    Previous Surface Area (HA) : 85
    Reclaimed Surface Area (HA): 15
    Date of Last Modification : 920629
    Thickness 67M
    Length 950M
    Width 600M
    Area 85HA
  • Name Miami
    General form Ore Genesis: Hydrothermal
    Orebody Typer: Disseminated, Vein (Lode)
    Ore minerals: Charcocite, Bornite, Covellite, Malachite, Azurite, Chrysocolla
    Class of Ore: Sulfide, Carbonate, Silicate, Native
    Gangue mineral: Cuprite

Controls for ore emplacement

  • Within And Around The Granite

Comments on the geologic information

  • Copper Mineralization Happened During The Last Stages Of Granitic Intrusions.
  • Copper Minerals Given By Company As A Mix Of 55% Oxides And 45% As Sulfides.

Economic information about the deposit and operations

Operation type Underground
Development status Past Producer
Commodity type Metallic
Deposit size Large
Significant Yes
Discovery year 1969
Mining method Filled Stopes - Horiz Cut and Fill W/Tailings
Milling method Flotation

Mining district

District name Globe-Miami District

Mineral rights holdings

Type of mineral rights Patented

Land status

Ownership category Private

Ownership information

  • Type Owner-Operator
    Owner Cities Services
    Home office Arizona
    Year 1981
    Last year 1983
  • Type Owner-Operator
    Owner Newmont Mining Corporation
    Interest 100
    Year 1983
    First year 1983
  • Type Owner-Operator
    Owner Magma Copper Co.
    ID 200825
    Interest 100
    Home office San Manuel, Az 85631
    Year 1987
    Last year 1996
  • Type Owner-Operator
    Owner Broken Hill Proprietary Co. Ltd.
    Home office Australia
    Year 1996
    First year 1996
  • Type Owner-Operator
    Owner BHP Billiton Group
    Interest 100
    Year 2009

Production statistics

  • Year 1978
    Material Sx-Ew Cathode Copper 5308470 Kilograms Cu Annually
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Primary Cu Copper Copper 5308.47mt
  • Year 1979
    Material Sx-Ew Cathode Copper 5731550 Kilograms Cu Annually
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Primary Cu Copper Copper 5731.55mt
  • Year 1980
    Material Sx-Ew Cathode Copper 5072470 Kilograms Cu Annually
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Primary Cu Copper Copper 5072.47mt
  • Year 1981
    Material Sx-Ew Cathode Copper 4634450 Kilograms Cu Annually
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Primary Cu Copper Copper 4634.45mt
  • Year 1982
    Material Sx-Ew Cathode Copper 4673 Mt Cathode Cu Produced
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Primary Cu Copper Copper 4673mt
  • Year 1983
    Material Sx-Ew Cathode Copper 4214 Mt Cathode Cu Produced
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Primary Cu Copper Copper 4214mt
  • Year 1984
    Material Cu
    Ore mined 4060mt
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Primary Copper Copper 4060mt
  • Year 1984
    Material Sx-Ew Cathode Copper 4061 Mt Cathode Cu Produced
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Primary Cu Copper Copper 4061mt
  • Year 1985
    Material Sx-Ew Cathode Copper 3656 Mt Cathode Cu Produced
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Primary Cu Copper Copper 3656mt
  • Year 1986
    Material Sx-Ew Cathode Copper 3451 Mt Cathode Cu Produced
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Primary Cu Copper Copper 3451mt
  • Year 1987
    Material Sx-Ew Cathode Copper 4257 Mt Cathode Cu Produced
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Primary Cu Copper Copper 4257mt
  • Year 1988
    Material Sx-Ew Cathode Copper 4445 Mt Cathode Cu Produced
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Primary Cu Copper Copper 4445mt
  • Year 1989
    Material Tailings Mined
    Ore mined 1244000mt
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Primary Cu Copper Copper 870mt
  • Year 1989
    Material Sx-Ew Cathode Copper 4029 Mt Cathode Cu Produced
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Primary Cu Copper Copper 4029mt
  • Year 1990
    Material Tailings Mined
    Ore mined 3156000mt
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Primary Cu Copper Copper 3967mt
  • Year 1990
    Material Sx-Ew Cathode Copper 4417 Mt Cathode Cu Produced
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Primary Cu Copper Copper 4417mt
  • Year 1991
    Material Tailings Mined
    Ore mined 3539000mt
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Primary Cu Copper Copper 4218mt
  • Year 1991
    Material Sx-Ew Cathode Copper 4536 Mt Cathode Cu Produced
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Primary Cu Copper Copper 4536mt
  • Year 1992
    Material Tailings Mined
    Ore mined 3410000mt
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Primary Cu Copper Copper 3497mt
  • Year 1992
    Material Sx-Ew Cathode Copper 5350 Mt Cathode Cu Produced
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Primary Cu Copper Copper 5350mt
  • Year 1993
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Primary Cu Copper Copper 3779mt
  • Year 1993
    Material Sx-Ew Cathode Copper 6220 Mt Cathode Cu Produced
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Primary Cu Copper Copper 6220mt

Comments on the production information

  • The In Place Grade Of The Ore Is 3.14% Cu; After Mining (Dilution) The Grade Is 2.8%. A New Grade For Moly Has Also Been Estimated Based On The New Miami East Feed To The Mill. Ore Must Be Blended With The Pinto Valley Ore Before Milling Average Grades For The Blended Miami East And Pinto Valley Ore Are Shown In This Set. The Actual Grade Of This Ore Is Presented In The Q Data Set. Development At Miami East Suspended Indefinitely As Of January 7, 1987.
  • Production Data From Magma Copper Co. Sec Form 10-K Reports For The End Of Years 1989 Through 1991.
  • The Recovery Given Is The Sx-Ew Plant Recovery, Not The Leach Recovery From The Mine. That Recovery Is Not Known. Product Leach Solutions Are Collected At The 1000 Foot Level Of The Mine, Pumped To The Surface & Treated By A Solvent-Extraction Electrowinning Plant.
  • History: Main Ore Body Consists Of Caved Ground Above The Old Miami Block-Cave Operation. Leached-Capping And Many Isolated Blocks Of Sulfide Are Being Leached.
  • 1910-50: THE MIAMI MINE WAS IN PRODUCTION. 1960's: IN SITU SOLUTION LEACHING BEGAN. 1982: THE OPEN PIT MINE AND CONCENTRATOR WERE SHUT DOWN, ALTHOUGH THE LEACHING AND SOLVENT-EXTRACTION PLANTS REMAINED IN OPERATION. 1984: THE MINE AND MILL RESUMED FULL PRODUCTION IN JULY. (KNW ,84) 1988: THE PINTO VALLEY DIVISION OF MAGMA BEGAN CONSTRUCTION OF A TAILINGS RECYCLING FACILITY. (PDS ,89)1989: Tailings treatment started at the end of April at a rate of 8,000 st/y of cathode copper from tailings. SXEW processing recovered 54% of the contained copper during the year.

Reserves and resources

  • Type In-situ
    Estimate year 1995
    Demonstrated 17800000mt ore
    Commodity Subtype Grade units Group Importance Year
    Copper Cu 0.38 wt-pct Copper Primary 1995
  • Type In-situ
    Estimate year 1973
    Reserves 50000000mt ore
    Measured 50000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Molybdenum Mo 0.003 wt-pct Molybdenum Secondary 1973
    Copper Cu 1.95 wt-pct Copper Primary 1973
  • Type In-situ
    Estimate year 1978
    Reserves 55000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Copper Cu 1.95 wt-pct Copper Primary 1978
  • Type In-situ
    Estimate year 1983
    Reserves 5443200mt ore
    Measured 5443200mt ore
    Commodity Subtype Grade units Group Importance Year
    Molybdenum MoS2 0.003 wt-pct Molybdenum Secondary 1983
    Copper Cu 3.14 wt-pct Copper Primary 1983
  • Type In-situ
    Estimate year 1989
    Total resources 51000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Copper Cu 2.1 wt-pct Copper Primary 1989
  • Type In-situ
    Estimate year 1994
    Measured 91000000mt ore
    Demonstrated 91000000mt ore
    Total resources 91000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Copper Cu 1.44 wt-pct Copper Major 1994
  • Type In-situ
    Estimate year 1993
    Measured 22837000mt ore
    Commodity Subtype Grade units Group Importance Year
    Copper Cu 0.36 wt-pct Copper Primary 1993
  • Type In-situ
    Name Miami East Orebody
    Estimate year 1984
    Reserves 5421000mt ore
    Remarks Cu Grade 3.14%
    Commodity Subtype Grade units Group Importance Year
    Copper Cu 3.14 wt-pct Copper Primary 1984
  • Type In-situ
    Estimate year 1995
    Demonstrated 17200000mt ore
    Commodity Subtype Grade units Group Importance Year
    Copper Cu 0.58 wt-pct Copper Primary 1995
  • Type In-situ
    Estimate year 1995
    Demonstrated 94000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Copper Cu 0.2 wt-pct Copper Primary 1995
  • Type In-situ
    Estimate year 1982
    Reserves 222000000mt ore
  • Type In-situ
    Estimate year 1995
    Demonstrated 266000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Copper Cu 0.45 wt-pct Copper Primary 1995
  • Type In-situ
    Estimate year 1989
    Reserves 229000000mt ore
  • Type In-situ
    Estimate year 1993
    Reserves 193000000mt ore

Comments on the reserve resource information

  • Development Has Been Postponed Indefinitely.
  • The Reserves Shown In Q-Matrix 1 Are The Current Reserves The Mining Company Considers Available As Of July 1983. The Figure In Q-Matrix 2 Was The Originally Estimated Reserves. Because Of Very Incompetent Rock Conditions The Company No Longer Considers The Original Figure An Accurate Estimate Of Obtainable Reserves. The Cu Grade Has Increased And Is Shown; The Grades Of The Byproducts Have Not Yet Been Determined; Consequently, The Original Grades For These Elements Are Shown. It Is Likely, However, The Grades Of The Accessory Commodities Will Also Improve.
  • M9c4=M1c1. Quant-Grade Matrix 1 Based On Stated Reserves In Magma Copper Co. Sec Form 10-K Report, Dec 31, 1991, P. 18.
  • Quantity Matrix 1 Consists Of Material That Was Broken-Up By The Blockcave Operation. M9c4=M1c1. The Reserve Grade Represents Mt Copper Recovered For 20 Yrs Based On A Constant Pls Flow From The Mine Of 195.6 L/Sec, 0.82 G/L Cu, 92% Plt Recovery, And 360 Op Days Per Yr.
  • Reserves Are For The Tailings Reclaim Proj., Insitu Project Resource Difficult To Quantify.

Workings at the site

  • Type of workings Underground
    Overall depth 956M
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method PROPOSED
    Mining Method HORIZ CUT & FILL W/TAILINGS 10-60
    Swell Factor .74
    Percent Waste Rock 0
    Percent Recovery 100
    Hardness of Rock UNKNOWN
    Rock Characteristics MULTIPLE SYSTEMS OF WEAKNESS PLANES
    Rock Support Chars. UNSUPPORTING MAY SLOUGH
    Mine Support Chars. OTHER
    Number of Shafts 3
    Length of Inclines (m) 1609
    Slope of Inclines 0
    Number of Inclines 1
    Capacity 1814
    Capacity Units MT ORE/DAY
    Unit Production Cost 17.14
    Units of Production $/MT ORE
    Operating Days per Year 250
    Operating Shifts per Day 3
    Year of Information 1983
  • Type of workings Surface
    Area 85HA
    Field Value
    Status of Mining Method ESTIMATE
    Mining Method HYDRAULICKING
    Hardness of Ore SAND, SILT
    Capacity 10900
    Capacity Units MT ORE/DAY
    Unit Production Cost 0.665
    Units of Production $/MT ORE
    Operating Days per Year 360
    Operating Shifts per Day 3
    Year of Information 1992
  • Type of workings Underground
    Overall depth 305M
    Field Value
    Status of Mining Method ESTIMATE
    Mining Method LEACHING IN PLACE (IN SITU) 10-89
    Swell Factor .6
    Percent Waste Rock 0
    Percent Recovery 27
    Hardness of Rock HARDROCK WITH LITTLE WATER
    Rock Characteristics UNKNOWN
    Rock Support Chars. UNKNOWN
    Mine Support Chars. UNKNOWN
    Number of Shafts 1
    Number of Inclines 4
    Avg. Length of Adits (m) 0
    Capacity 11734
    Capacity Units LITER SOLN/MIN
    Unit Production Cost .277
    Units of Production $/KG COMMOD
    Operating Days per Year 360
    Operating Shifts per Day 3
    Year of Information 1992

Comments on other economic factors

  • The In Place Grade Of The Ore Is 3.14% Cu; After Mining (Dilution) The Grade Is 2.8%. A New Grade For Moly Has Also Been Estimated Based On The New Miami East Feed To The Mill. Ore Must Be Blended With The Pinto Valley Ore Before Milling Average Grades For The Blended Miami East And Pinto Valley Ore Are Shown In This Set. The Actual Grade Of This Ore Is Presented In The Q Data Set.
  • The No. 2 Tailings Project Is A Hydraulic Mine Operation Of The Old Miami No. 2 Tailings Pile. Four Mining Stations (Mining Sets) Each Consisting Of Two 10-Cm-Diam Monitors, Eductor Pumps, And Slurry Booster Pumps. Two Mining Sets Operate At Anyone Time To Mine 10,900 Mtpd Ore. Two Mining Sets Operate From Different Parts Of The Tailings Pile To Produce A Blended Slurry. The Slurry Is Pumped A Average Distance Of 610 M (Max Dist = 1,220 M) To The Processing Plant. At The Processing Plant, The Tailings Are Leached In A Thickener. Then The Pregnant Leach Solution Is Decanted Off The Thickener, And Is Clarified, Before Being Pumped To The Nearby Sx-Ew Plant. The Pls Flow Sent To The Sx-Ew Is 189.3 L/Sec Containing 1.628 G/L Copper. This Pls Joins 195.6 L/Sec Pls, Containing 0.82 G/L Cu, From The Miami In Situ Leach Operation (Seq No 0040070053) At The Solvent Extraction Collection Pond. The Sx Plant Processes 384.8 L/S Pls With An Average Feed Grade Of 1.217 G/L Cu. The Electrowinning Tank House (Ew) Produces A Total Of 37,230 Kgs Cathode Copper Per Day, Of Which 24,490 Kgs Cu Is Attributed To The No. 2 Tailings Project. Feed Rec 101 Is For Grade Of Pls Flow From The No. 2 Tailings Processing Plant Sent To The Sx-Ew Plant. The Blended Feed Of The Total Sx Plant Feed Is 1.217 G/L.
  • The K1 Record Represents The Sx-Ew Plant With The Combined Flows Of 189.3 L/Sec From The No. 2 Tailings Project & 195.6 L/Sec From The In Situ Leach, For A Total Of 384.8 L/Sec. Pls. K2 Record Represents The Period After The No. 2 Tailings Project Is Closed In 1998, The The Pls Flow Is Reduced To 195.6 L/Sec. The Capital (Working Capital) And Operating Costs Given In Rec. K1 Is Attributed Only To The Cost Related To The Pls Flow And Copper Produced From The In-Situ Operation.
  • Reserves Are For The Tailings Reclaim Proj., Insitu Project Resource Difficult To Quantify. The Pls Grade Listed In Feed Rec 1, Line 1 Is The Pls Feed Grade From The In-Situ Leach Only. The Blended Feed Grade Is 1.217 G/L Copper.

Comments on development

  • July 1988, Acquired Substantially All Assets Of Inspiration Copper Company (Subsidiary Of Inspiration Resources Corporation)
  • In May 2007, the Miami project was associated with BHP Billiton's 100%-owned Pinto Valley project (profile #005523) which was being put back in production. The Pinto Valley Miami Unit had Measured and Indicated in-situ leach ore resources totaling 214 million mt grading 0.32% Cu. (BHP Billiton WS ,07)In June 1999, BHP reported that the Miami in-situ leach and Miami No.2 tailings leach operations closed operations. (Arizona Mining Association ,99)In 1998, BHP was reported to be extracting Cu from a 35 million mt tailings pile and revegetating the land with the reprocessed tailings. The Old Miami and Old Dominion were part of a $100 million clean-up campaign in the Pinal Creek area. (Australian ,98)In 1994 Magma launched a feasibility study aimed at expanding reserves and production at the mine. Results were expected during the fourth quarter of 1995, with the potential expansion to begin during 1997 at a rate of 25,000 st/y Cu. (Magma ,94 AR ,95)

Reference information

Bibliographic references

  • Workings

    Paydirt 4/70 (Development)

  • Geology

    Me 5/75 (Ore Body Size,Development, Mining Method, Milling)

  • Reserve-Resource

    Magma Copper Company 1993 Annual Report. P. 8.

  • Reference

    Hardwick,W R,1967, Fracturing A Deposit With Nuclear Explosives and Recovering Copper By The In-Situ Leach Method, Bur Of Mines Ic 6996, P6-8. (Description Of Leach Equipment)

  • Production

    Baer,R L,1977, Trip Notes From Visit To Miami Mine, Bom-IFOC September, 1977 (Detailed Information About Operation)

  • Deposit

    Burgin,L B,1976 Time Required In Developing Selected Copper Mines, Bur Of Mines Ic 8702, P60-84(Production Records and Historical Development)

  • Orebody

    Peterson, N.P. (1962), Geology and ore deposits of the Globe-Miami District, Arizona, USGS PP 342: 83-88.

  • Workings

    Trip Notes From Arizona Dmr 10/73 (Development)

  • Deposit

    Wall Street Journal 4/21/69 (Exploration)

  • Geology

    The Porter GeoConsultancy webpage for the Globe-Miami District contain detailed descriptions of the geology. Accessed on 7/27/2010 http://www.portergeo.com.au/index.asp

  • Reserve-Resource

    Magma Copper Co., 1994 10-K, P.19-20.

  • Production

    Fletcher,J B,1971, In-Place Leaching, Miami Mine, Miami,Arizona, Aime Preprint 71-As-40, 13p.(Description Of Operation. Solution Strengths)

  • Workings

    Skillings 7/75 (Development)

  • Reserve-Resource

    Magma Copper Company Sec Form 10-K Rept, Dec 31, 1993, P. 18 Copper Industry Of Arizona. P. 49.Z

  • Deposit

    Arizona Republic 12/30/69,P. 25 (Exploration)

  • Production

    At The Miami Mine, Miami Copper Company, Gila County, Arizona, Bur Of Mines 8271, 96p. (Leach Operation Description)

  • Geology

    Peterson,N P,1962, Geology and Ore Deposits Of The Globe-Miamidistrict, Arizona: USGS Prof Pa 342. (Deposit Maps and Cross-Sections)

  • Workings

    Mining Magazine 9/75 (Development, Production Rate)

  • Reserve-Resource

    Magma Copper Co., 1994 10-K, P.19.

  • Deposit

    American Metal Market 1/5/70 (Exploration)

  • Production

    Mc Waters, Tom. Developing Magma'S Tailings Leach Operation Min. Eng. Mag., Sep. 1990, Pp. 1075-1080.

  • Geology

    Ransome, L,1919, The Copper Deposits Of Ray and Miami, Arizona: USGS Prof Pa 115. (Lands and Deposit Description)

  • Workings

    Cities Service Annual Report 1974 (Production Plans)

  • Reserve-Resource

    Magma Copper Co. Sec Form 10-K Report, Dec 31, 1992, P. 21.

  • Geology

    Olmsted and Johnson, 1966, In Titley and Hicks, Univ Of Az Press.

  • Deposit

    Magma Copper Co. Sec Form 10-K Reports For The End Of Years 1989-1991.

  • Workings

    Skillings 1/75 (Tailings Fill)

  • Deposit

    Walenga, Karen. Project To Recover 125 Million Pounds Of Copper. Paydirt Mag. (Southwestern Ed.). March 1988, Pp. 4a-6a.

  • Reserve-Resource

    Titley, S.R., 1992, Evidence for crustal controls of metallogeneis in epigenetic ores of the Southern Cordillera, United States and Mexico: Society of Mining, Metallurgy, and Exploration Annual Meeting Preprint 920-210, 11p.

  • Deposit

    Newmont Mining Corp. Annual Report 1982. P. 3.

  • Deposit

    Arizona Paydirt. Miami East Underground Mine Is To Begin Production In July. Jan. 1982, Pp. 7-10.

  • Deposit

    Zach, R. Pinto Valley Copper Co., Personal Contact, July 21,1983.

  • Deposit

    Shank, R., Senior Engineer, Pinto Valley Copper Co.,Personal Contacts, July 22 And 26, 1983.

Comments on the references

  • Data taken from other MRDS Sources:

    Magma No. 2 Tailings 10137065
    Miami Leach 10161493
    Miami East 10048778
    Miami Concentrator 10283121
    Miami Property 10112449
    Miami Pit 10209726

General comments

Subject category Comment text
Deposit Refs. 1c 7990 USGS Map 260/Mesa/(1:250000 Series) Ariz B Co. Reserves In Apache-Blk Forest-Giant Cactus-Globe-Ire Mines Property Update July 1987
Deposit Down Thrown Segment Of The Miami Fault
Deposit The No. 2 Tailings Project Is A Hydraulic Mine Operation Of The Old Miami No. 2 Tailings Pile. Four Mining Stations (Mining Sets) Each Consisting Of Two 10-Cm-Diam Monitors, Eductor Pumps, And Slurry Booster Pumps. Two Mining Sets Operate At Anyone Time To Mine 10,900 Mtpd Ore. Two Mining Sets Operate From Different Parts Of The Tailings Pile To Produce A Blended Slurry. The Slurry Is Pumped A Average Distance Of 610 M (Max Dist = 1,220 M) To The Processing Plant. At The Processing Plant, The Tailings Are Leached In A Thickener. Then The Pregnant Leach Solution Is Decanted Off The Thickener, And Is Clarified, Before Being Pumped To The Nearby Sx-Ew Plant. The Pls Flow Sent To The Sx-Ew Is 189.3 L/Sec Containing 1.628 G/L Copper. This Pls Joins 195.6 L/Sec Pls, Containing 0.82 G/L Cu, From The Miami In Situ Leach Operation (Seq No 0040070053) At The Solvent Extraction Collection Pond. The Sx Plant Processes 384.8 L/S Pls With An Average Feed Grade Of 1.217 G/L Cu. The Electrowinning Tank House (Ew) Produces A Total Of 37,230 Kgs Cathode Copper Per Day, Of Which 24,490 Kgs Cu Is Attributed To The No. 2 Tailings Project.
Deposit The Pregnant Solution (Pls) From The In Situ Join The Pls From The No. 2 Tailings Project (Seq No 0040070706). The No.2 Tailings Project Will Close In 1998. The In Situ Leach Is Anticipated To Continue Until 2011. Property Updated In July 1987 Property. Updated In June 1992

Reporter information

Type Date Name Affiliation Comment
Reporter 23-JUN-97 Dolzani, Roger L. U.S. Bureau of Mines
Reporter 13-JUL-95 Sachiko Tanikawa U.S. Geological Survey
Editor 09-JUN-09 Anderson, Claire U.S. Geological Survey
Reporter 21-FEB-84 Intermountain Field Operations Center (IFOC) U.S. Bureau of Mines
Reporter 04-NOV-83 ADMR U.S. Bureau of Mines
Reporter 04-OCT-96 Hite, Alan G. U.S. Bureau of Mines
Reporter 11-MAR-97 Hite, Alan G. U.S. Bureau of Mines

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Current status (per MSHA)

StatusAbandoned since 03/31/1986
MSHA mine ID0200825
Mine name (MSHA)Miami East Mine
Current operatorPinto Valley Copper Corp
Current controller (parent)Newmont Corporation
Mine typeUnderground (Metal / non-metal)

MSHA cross-reference per the original MRDS record. Mine status and operator reflect MSHA's last published Mines export (February 2025); MSHA's public bulk feed has been unavailable since, so this may be out of date. See the Mine Data Retrieval System for current status.

Open MSHA's Mine Data Retrieval System for inspections, accidents, and violations for this mine.

Operator history (post-MRDS)

MRDS records operators as of each record's last update (≤ 2019). Some of the operators listed here have since changed hands or dissolved:

  • Newmont Mining Corporation — renamed to Newmont Corporation (2019)
    Renamed from Newmont Mining Corporation to Newmont Corporation in early 2020 (after the 2019 merger with Goldcorp).

Curated by qvyshift.com from publicly-reported M&A activity (SEC filings, press releases, USGS Mineral Yearbooks). Not authoritative — verify against primary sources before relying on it. The MSHA panel above is the current authoritative source for actively-permitted mines.

Maps centered on this site

Authoritative Arizona resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.