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Iron Cap Mine, Landsman Camp (Landsman group), Aravaipa, Santa Teresa Mts, Aravaipa District, Graham Co., Arizona, USA

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A former surface and underground Pb-Zn-Ag-Cu-Au-Fluorspar mine located in sec. 19, T5S, R20E, 2 miles NE of Aravaipa, ½ mile N of Landsman Camp, and near the head of Arizona Gulch, in the foothills of the Santa Teresa Mountains, at an altitude of approximately 5,000 feet, on private land.

Mineralization is a vein deposit hosted in the Horquilla Formation and the Pinkard Formation. Some veins occur in faults between formations. Others are wholly in limestone beds. Veinlets contain irregular lenses and pods of ore. An associated rock unit is the Copper Creek Granodiorite. Ore control was faults and ore concentration was in broad, low-plunging anticlines. No alteration noted.

The mineralized zones occur in the lower tunnel of this mine. The most westerly zone strikes N70W, and its dip, which varies, averages about 40º to the N. The other zone strikes N85W and is vertical from the surface to 4 feet below the upper tunnel, where it assumes a dip of of 40º to the N. The upper tunnel vein may be a fissure that branches from the lower tunnel vein where the break in dip occurs. Steeply dipping post-mineral faults of north- to NW-ward strike intersect the thrust fault below the lower tunnel. The lower tunnel ore zones occur near the base of a limestone thrust block. Ores generally not oxidozed. Oxidztion of the ore zones within the district is probably shallowest at these workings, where it extends only a few feet below the surface.

Area structures include low-angle, reverse faults between Horquilla and Pinkard and block faulting trending NNW. Regional trends: minor Pre-Cretaceous E- and NE-trending folds and major Post-Cretaceous NNW-trending faults.

The princpal workings are accessible through two entries. The upper entry, 149 feet vertically above the lower one, is a tunnel driven west on a vein for 110 feet. Development from this drift tunnel consists of a 20-foot raise and crosscuts into both walls of the vein. The lower entry, a 630 foot crosscut, intersects a vei 430 feet SW of its portal. A drift extends weserly for 200 feet from this intersection. From the drift, some stoping has been done and a winze 20 feet deep has been sunk. A raise from the top of the stope connects with the upper workings. Another drift from a point in the crosscut 75 feet SW of the vein intersection extends 56 feet SE-ward. Also, a large glory hole in the limestone formation.

Production not given. Assay showed 1-19% Pb, 1-35% Zn, less than 1.7 oz/ton Ag, and a trace of Cu, Au.



References:
Weed, W.H. (1916) The Mines Handbook, Vol. XII: 167.

Ross, C.P. (1925a), Geology and ore deposits of the Aravaipa and Stanley mining districts, Graham County, Arizona, USGS Bull. 763.

Denton, T.C. (1947), Aravaipa lead-zinc deposits, Graham County, Arizona, U.S. Bureau of Mines Report of Investigation 4007: 5, 6.

Galbraith, F.W. (1947), Minerals of Arizona, Arizona Bureau of Mines Bull. 153: 17.

Wilson, E.D., et al (1950), Arizona zinc and lead deposits, part I, Arizona Bureau of Mines Bull. 156: 56-58.

Simons, F.S. & E. Munson (1963), Johannsenite from the Aravaipa mining district, Arizona, American Mineralogist: 48: 1154-1158.

Simons, F.S. (1964), Geology of the Klondyke quadrangle, Graham and Pinal Counties, Arizona, USGS PP 461: 134.

Elevatorski, E.A. (1971), Arizona Department of Mineral Resources (ADMR), Arizona Fluorspar: 19.

Elevatorski, E.A. (1978), Arizona Industrial Minerals, Arizona Department of Mineral Resources, Minerals Report No. 2: 33.

Reiter, B.E. (1981), Controls on lead-zinc skarn mineralization, Iron Cap mine area, Aravaipa district, Graham County, Arizona, in C. Stone and J.P. Jenney (editors), Arizona Geological Society Digest: 13: 117-125.

Phillips, K.A. (1987), Arizona Industrial Minerals, 2nd. Edition, Arizona Department of Mines & Minerals Mineral Report 4, 185 pp.

Wilson, W.E. (1988), The Iron Cap Mine, Mineralogical Record: 19(2): 81-87.

Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 228, 245, 258, 263, 270, 288, 311, 377.

Grant, Raymond W., Bideaux, R.A., and Williams, S.A. (2006) Minerals Added to the Arizona List 1995-2005: 4.

USGS Cobre Grande Min Quadrangle map.

Arizona Department of Mineral Resources Brushy group file.

Arizona Department of Mineral Resources U file.

U.S. Bureau of Land Management Mining Claims Lead File #6032 (Jul, 1980).

MRDS database Dep. ID #10039448, MRDS ID #M050094; and Dep. ID #10161369, MAS ID #0040090178.





 Map Reference: 32°58'0"N , 110°19'30"W

This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.



Mineral List:
  		•  Andradite
    Ca
     
    3
    		Fe
    3+
    2
    		[SiO
     
    4
    		]
     
    3
    Reference: [Wilson, W.E. (1988), The Iron Cap Mine, Min.Rec.: 19(2): 81-87.]
  		•  Aragonite
    CaCO
     
    3
    Reference: [Wilson, W.E. (1988), The Iron Cap Mine, Min.Rec.: 19(2): 81-87.]
  		•  Axinite-(Mn)
    Ca
     
    2
    		Mn
    2+
     
    		Al
     
    2
    		[OH|BSi
     
    4
    		O
     
    15
    		]
    Habit: Bladed
    Colour: Yellow-green
    Description: Commonly with a black coating.
    Reference: [Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 288; Reiter, B.E. (1981), Controls on lead-zinc skarn mineralization, Iron Cap mine area, Aravaipa district, Graham Co., AZ, in C. Stone and J.P. Jenney (editors), AZ Geol. Soc. Digest: 13: 117-125.; Grant, Raymond W., Bideaux, R.A., and Williams, S.A. (2006) Minerals Added to the Arizona List 1995-2005: 4.]
    Site Photo
    Iron Cap Mine, Landsman Camp (Landsman group), Aravaipa, Santa Teresa Mts, Aravaipa District, Graham Co., Arizona, USA
    © P N Min.
  		•  Calcite
    CaCO
     
    3
    Reference: [Wilson, W.E. (1988), The Iron Cap Mine, Min.Rec.: 19(2): 81-87.]
  		•  Chalcocite
    Cu
     
    2
    		S
    Description: Small amounts.
    Reference: [Wilson, W.E. (1988), The Iron Cap Mine, Min.Rec.: 19(2): 81-87; Wilson, E.D., et al (1950), Arizona zinc and lead deposits, part I, AZ Bur. Mines Bull. 156: 58.]
  		•  Chalcopyrite
    CuFeS
     
    2
    Reference: [Wilson, W.E. (1988), The Iron Cap Mine, Min.Rec.: 19(2): 81-87; Wilson, E.D., et al (1950), Arizona zinc and lead deposits, part I, AZ Bur. Mines Bull. 156: 58.]
  		•  Clinochrysotile
    Reference: [Grant, Raymond W., Bideaux, R.A., and Williams, S.A. (2006) Minerals Added to the Arizona List 1995-2005: 4.]
  		•  Covellite
    CuS
    Description: Small amounts.
    Reference: [Wilson, E.D., et al (1950), Arizona zinc and lead deposits, part I, AZ Bur. Mines Bull. 156: 58; Wilson, W.E. (1988), The Iron Cap Mine, Min.Rec.: 19(2): 81-87.]
  		•  Creedite
    Ca
     
    3
    		[SO
     
    4
    		|Al
     
    2
    		F
     
    8
    		(OH)
     
    2
    		] · 2H
     
    2
    		O
    Reference: [Wilson, W.E. (1988), The Iron Cap Mine, Min.Rec.: 19(2): 81-87.]
  		•  Epidote
    {Ca
     
    2
    		}{Al
     
    2
    		Fe
    3+
     
    		}[O|OH|SiO
     
    4
    		|Si
     
    2
    		O
     
    7
    		]
    Reference: [Wilson, W.E. (1988), The Iron Cap Mine, Min.Rec.: 19(2): 81-87.]
  		•  Fluorite
    CaF
     
    2
    Reference: [Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 258; Wilson, W.E. (1988), The Iron Cap Mine, Min.Rec.: 19(2): 81-87.]
  		•  Galena
    PbS
    Reference: [Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 228; Ross, C.P. (1925a), Geology and ore deposits of the Aravaipa and Stanley mining districts, Graham Co., AZ, USGS Bull. 763; Simons, F.S. & E. Munson (1963), Johannsenite from the Aravaipa mining district, AZ, Am.Min.: 48: 1154-1158; Simons, F.S. (1964), Geology of the Klondyke quadrangle, Graham and Pinal Cos., AZ, USGS PP 461; Wilson, W.E. (1988), The Iron Cap Mine, Min.Rec.: 19(2): 81-87; Galbraith, F.W. (1947), Minerals of AZ, AZ Bur. Mines Bull. 153: 17; Wilson, E.D., et al (1950), Arizona zinc and lead deposits, part I, AZ Bur. Mines Bull. 156: 58.]
    Site Photo
    Iron Cap Mine, Landsman Camp (Landsman group), Aravaipa, Santa Teresa Mts, Aravaipa District, Graham Co., Arizona, USA
    © jo-esche 2007
  		•  Gypsum
    Ca[SO
     
    4
    		] · 2H
     
    2
    		O
    Reference: [Wilson, W.E. (1988), The Iron Cap Mine, Min.Rec.: 19(2): 81-87.]
  		•  Hedenbergite
    var: Manganoan Hedenbergite
    Reference: [Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 245; Reiter, B.E. (1981), Controls on lead-zinc skarn mineralization, Iron Cap mine area, Aravaipa district, Graham Co., AZ, in C. Stone and J.P. Jenney (editors), AZ Geol. Soc. Digest: 13: 117-125.]
  		•  Hematite
    Fe
     
    2
    		O
     
    3
    Reference: [Wilson, W.E. (1988), The Iron Cap Mine, Min.Rec.: 19(2): 81-87.]
  		•  Hopeite
    Zn
     
    3
    		(PO
     
    4
    		)
     
    2
    		·4H
     
    2
    		O
    Colour: White
    Description: Occurs as botryoidal masses.
    Reference: [Grant, Raymond W., Bideaux, R.A., and Williams, S.A. (2006) Minerals Added to the Arizona List 1995-2005: 4.]
  		•  Ilvaite
    CaFe
    2+
    2
    		Fe
    3+
     
    		[O|OH|Si
     
    2
    		O
     
    7
    		]
    Description: Occurs as vitreous, fine-grained material.
    Reference: [Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 258; Wilson, W.E. (1988), The Iron Cap Mine, Min.Rec.: 19(2): 81-87.]
  		•  Johannsenite
    CaMn
    2+
     
    		[Si
     
    2
    		O
     
    6
    		]
    Description: The major pyroxene, both massive material & crystals.
    Reference: [Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 245; Reiter, B.E. (1981), Controls on lead-zinc skarn mineralization, Iron Cap mine area, Aravaipa district, Graham Co., AZ, in C. Stone and J.P. Jenney (editors), AZ Geol. Soc. Digest: 13: 117-125.]
    Site Photo
    Iron Cap Mine, Landsman Camp (Landsman group), Aravaipa, Santa Teresa Mts, Aravaipa District, Graham Co., Arizona, USA
    © O. Dziallas
  		•  Kutnohorite
    Ca(Mn,Mg,Fe)(CO
     
    3
    		)
     
    2
    Colour: Pale pink to white
    Description: Botryoidal coatings on quartz.
    Reference: [Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 245; Reiter, B.E. (1981), Controls on lead-zinc skarn mineralization, Iron Cap mine area, Aravaipa district, Graham Co., AZ, in C. Stone and J.P. Jenney (editors), AZ Geol. Soc. Digest: 13: 117-125; Wilson, W.E. (1988), The Iron Cap Mine, Min.Rec.: 19(2): 81-87.]
  		•  Magnetite
    Fe
    2+
     
    		Fe
    3+
    2
    		O
     
    4
    Reference: [Wilson, W.E. (1988), The Iron Cap Mine, Min.Rec.: 19(2): 81-87.]
  		•  Manganbabingtonite
    Ca
     
    2
    		(Mn,Fe)FeSi
     
    5
    		O
     
    14
    		(OH)
    Habit: Bladed crystals to 1 cm
    Colour: Black
    Reference: [Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 288; Reiter, B.E. (1981), Controls on lead-zinc skarn mineralization, Iron Cap mine area, Aravaipa district, Graham Co., AZ, in C. Stone and J.P. Jenney (editors), AZ Geol. Soc. Digest: 13: 117-125.]
    Site Photo
    Iron Cap Mine, Landsman Camp (Landsman group), Aravaipa, Santa Teresa Mts, Aravaipa District, Graham Co., Arizona, USA
    © 2004 ROM
  		•  Nekoite
    Ca
     
    3
    		Si
     
    6
    		O
     
    15
    		·7H
     
    2
    		O
    Habit: Radiating, fibrous
    Colour: White
    Description: Occurs in contact meta-limestone filling fractures in quartz-epidote hornfels.
    Reference: [Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 311.]
    Site Photo
    Iron Cap Mine, Landsman Camp (Landsman group), Aravaipa, Santa Teresa Mts, Aravaipa District, Graham Co., Arizona, USA
    © Elmar Lackner
  		•  Pyrite
    FeS
     
    2
    Reference: [Wilson, W.E. (1988), The Iron Cap Mine, Min.Rec.: 19(2): 81-87; Wilson, E.D., et al (1950), Arizona zinc and lead deposits, part I, AZ Bur. Mines Bull. 156: 58.]
  		•  Quartz
    SiO
     
    2
    Reference: [Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 258, 270; Wilson, W.E. (1988), The Iron Cap Mine, Min.Rec.: 19(2): 81-87.]
    Site Photo
    Iron Cap Mine, Landsman Camp (Landsman group), Aravaipa, Santa Teresa Mts, Aravaipa District, Graham Co., Arizona, USA
    © Karl Volkman
  		•  Sphalerite
    (Zn,Fe
    2+
     
    		)S
    Colour: Green to yellow
    Description: Gem-quality crystals.
    Reference: [Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 258, 377; Wilson, E.D., et al (1950), Arizona zinc and lead deposits, part I, AZ Bur. Mines Bull. 156: 58..]
    Site Photo
    Iron Cap Mine, Landsman Camp (Landsman group), Aravaipa, Santa Teresa Mts, Aravaipa District, Graham Co., Arizona, USA
    © 2001 John H. Betts
  		•  Thaumasite
    Ca
     
    3
    		[CO
     
    3
    		|SO
     
    4
    		|Si(OH)
     
    6
    		] · 12H
     
    2
    		O
    Reference: [Wilson, W.E. (1988), The Iron Cap Mine, Min.Rec.: 19(2): 81-87.]


    26 entries listed. 24 valid minerals.

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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Jobs in Arizona, USA Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 26th Nov 2009 06:37:18