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Black Dike Mine (Black Dike group; Black Dike claim; Black Dike deposit; Black Dyke Mine; Big Dike; Bobson group; Big Dike Apex & Ajax), Papago District (Sierrita District), Sierrita Mts, Pima Co., Arizona, USAi
Regional Level Types
Black Dike Mine (Black Dike group; Black Dike claim; Black Dike deposit; Black Dyke Mine; Big Dike; Bobson group; Big Dike Apex & Ajax)Mine
Papago District (Sierrita District)Mining District
Sierrita MtsMountain Range
Pima Co.County
ArizonaState
USACountry

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Latitude & Longitude (WGS84): 31° 55' 56'' North , 111° 16' 59'' West
Latitude & Longitude (decimal): 31.93222,-111.28306
GeoHash:G#: 9t8vetn4s
USGS MRDS Record:10039556
Locality type:Mine
Köppen climate type:BSk : Cold semi-arid (steppe) climate
Nearest Settlements:
PlacePopulationDistance
Three Points5,581 (2011)16.3km
Valencia West9,355 (2011)27.4km
Green Valley21,391 (2011)28.6km
Arivaca Junction1,090 (2011)30.9km
Sahuarita25,707 (2017)31.0km


‡Ref.: Ransome, F.L. (1922), Ore deposits of the Sierrita Mountains, Pima County, Arizona, USGS Bull. 725-J: 407-428.

Wright, R.J. (1950) Reconnaissance of Certain Uranium Deposits in Arizona, U.S. Atomic Energy Commission RMO-679.

US Atomic Energy Commission Preliminary Reconnaissance Report Pima County (1951): 627, 631, 632, 637.

Wilmarth, V.R., et al (1952), Uranium in fluorite deposits, USGS Circular 220: 13-18.

McKelvey, V. (1955), Search for uranium in the U.S., USGS Bull. 1030-A: 26-27.

Farnham, L.L., Stewart, L.A., and Delong, C.W. (1961), Manganese Deposits of Eastern Arizona, US Bureau of Mines Information Circular 7990.

Granger, H.C. & R.B. Raup (1962), Reconnaissance study of uranium deposits in Arizona, USGS Bull. 1147-A: A25-A29.

Van Alstine, R.E. and Moore, R.T. (1969) Fluorspar, in USGS & Arizona Bureau of Mines & U.S. Bureau of Reclamation, Mineral and Water Resources of Arizona, Arizona Bureau of Mines Bull. 180 (USGS Bull.871): 353.

U.S. Atomic Energy Commission RME-159 (1970) Preliminary Reconnaissance for Uranium in Pima and Pinal Counties, Arizona, 1950 to 1957: 6-12.

Elevatorski, E.A. (1971), Arizona Fluorspar, Arizona Department of Mineral Resources, U.S. Bureau of Mines Report of Investigation 5651: 33-34.

Krieger, M.H. (1973) Field Examination (Black Dike Mine).

Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 132 (Table 4).

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

Peirce, H. Wesley (1990), Arizona Geological Survey Industrial Minerals card file.

MRDS database Dep. ID file #10039556, MRDS ID #M050276; and, Dep. ID #10186773, MAS ID #0040190126; and, Dep. ID #10208011, MAS ID #0040190120; and, Dep. ID #10210581, MAS ID #0040190032.

A former small surface and underground Cu-Fluorspar-U-Pb-Ag-Mn-W prospect/group of 5 patented claims located in secs. 23, 24, 25 & 26, T.17S., R.10E. (and/or: the SE¼SE¼ sec. 23, T.17S., R.10E.), on the western flank of the Sierrita Mountains, about 27 miles SSW of Tucson. This property is on ranchland owned by Col. Moller of Tucson (private property). Operated by Ybarra, Allen & Wilson.

Mineralization is a contact metamorphic deposit of spotty and weak copper staining, pyrite, chalcopyrite, and disseminated fluorite with locally admixed manganese and sooty pitchblende in irregular and lenticular ore bodies along fracture veins. Ore control was irregular fractures extending out from the dike contact. Radioactive material is in those parts of the contact, metamorphic zone richest in sulfides and fluorite. The deposit is near the contact zone between the gneissic granite and the metamorphosed sedimentary rocks (or between Mesozoic granite and a basaltic dike). The metamorphic rocks strike N.0º-20ºW. and dip steeply Eastward. The mine is in gneissic granite that is cut by a small, intensely bleached and altered basalt (?) dike, averaging 2 feet wide and is highly altered. Outcrop of silicified schist with thin coating of Mn oxide gives appearance of a large deposit. The ore body is 1.22 meters wide, 12.19 meters depth to top and 45.72 meters thick. It strikes N10W and dips 65E.

Samples from the dike contained less than 0.006% U; from the contact metamorphic zone 0.011 to 0.16% U; and, for copper the range was 0.01 to 0.97% - lowest in the dike.

The lower West slope of the Sierrita Mountains in the vicinity is intricately cut by dry washes and has a rough rolling topography. The western flank is composed of steeply-dipping metamorphosed sandstone, limestone, shale, rhyolite, tuff, and conglomerate, comprised largely of Tornado Limestone (Pennsylvanian-Mississippian) or Martin Limestone (Devonian), and the Lower Cretaceous Comanche series. The core of the Mountains is largely composed of granite and granite gneiss.

Workings include a shaft, sunk originally for Cu in WWI, then for U in 1950's. Workings are 22.86 meters deep. No known production but production was probable during WWI for Pb, Ag, Cu. Local concentrations of uranium minerals could be found but likelyhood of a large, high-grade deposit is weak. More work has been done since the Bull. 1147 report.

Regions containing this locality

North America PlateTectonic Plate
Sonoran Desert, North AmericaDesert

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


15 valid minerals.

Detailed Mineral List:

Anglesite
Formula: PbSO4
Reference: MRDS database Dep. ID file #10039556, MRDS ID #M050276.
Calcite
Formula: CaCO3
Description: As veinlets in a basalt-like dike about 1 inch wide.
Reference: Granger, H.C. & R.B. Raup (1962), Recon. study of uranium deposits in AZ, USGS Bull. 1147-A: A25-A29.
Chalcocite
Formula: Cu2S
Reference: MRDS database Dep. ID file #10039556, MRDS ID #M050276.
Chalcopyrite
Formula: CuFeS2
Reference: Keith, Stanton B. (1974), AZ Bur. of Geol. & Min. Technology, Geol. Survey Br. Bull. 189, Index of Mining Properties in Pima County, AZ: 132 (Table 4); Granger, H.C. & R.B. Raup (1962), Recon. study of uranium deposits in AZ, USGS Bull. 1147-A: A25-A29.
'Chlorite Group'
Reference: Granger, H.C. & R.B. Raup (1962), Recon. study of uranium deposits in AZ, USGS Bull. 1147-A: A25-A29.
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Reference: Granger, H.C. & R.B. Raup (1962), Recon. study of uranium deposits in AZ, USGS Bull. 1147-A: A25-A29.
Fluorite
Formula: CaF2
Colour: Purple
Description: Fine-grained material.
Reference: Keith, Stanton B. (1974), AZ Bur. of Geol. & Min. Technology, Geol. Survey Br. Bull. 189, Index of Mining Properties in Pima County, AZ: 132 (Table 4); Granger, H.C. & R.B. Raup (1962), Recon. study of uranium deposits in AZ, USGS Bull. 1147-A: A25-A29.
Galena
Formula: PbS
Reference: MRDS database Dep. ID file #10039556, MRDS ID #M050276.
'Garnet Group'
Formula: X3Z2(SiO4)3
Reference: Granger, H.C. & R.B. Raup (1962), Recon. study of uranium deposits in AZ, USGS Bull. 1147-A: A25-A29.
Gold
Formula: Au
Reference: MRDS database Dep. ID file #10039556, MRDS ID #M050276.
Magnetite
Formula: Fe2+Fe3+2O4
Reference: Granger, H.C. & R.B. Raup (1962), Recon. study of uranium deposits in AZ, USGS Bull. 1147-A: A25-A29.
Malachite
Formula: Cu2(CO3)(OH)2
Reference: MRDS database Dep. ID file #10039556, MRDS ID #M050276.
'Psilomelane'
Reference: MRDS database Dep. ID file #10039556, MRDS ID #M050276.
Pyrite
Formula: FeS2
Reference: Keith, Stanton B. (1974), AZ Bur. of Geol. & Min. Technology, Geol. Survey Br. Bull. 189, Index of Mining Properties in Pima County, AZ: 132 (Table 4); Granger, H.C. & R.B. Raup (1962), Recon. study of uranium deposits in AZ, USGS Bull. 1147-A: A25-A29.
Pyrolusite
Formula: Mn4+O2
Reference: MRDS database Dep. ID file #10039556, MRDS ID #M050276.
Sphalerite
Formula: ZnS
Reference: MRDS database Dep. ID file #10039556, MRDS ID #M050276.
Uraninite
Formula: UO2
Description: Sooty variety.
Reference: Keith, Stanton B. (1974), AZ Bur. of Geol. & Min. Technology, Geol. Survey Br. Bull. 189, Index of Mining Properties in Pima County, AZ: 132 (Table 4); Granger, H.C. & R.B. Raup (1962), Recon. study of uranium deposits in AZ, USGS Bull. 1147-A: A25-A29.
Uraninite var: Pitchblende
Formula: UO2
Description: Sooty variety.
Reference: Keith, Stanton B. (1974), AZ Bur. of Geol. & Min. Technology, Geol. Survey Br. Bull. 189, Index of Mining Properties in Pima County, AZ: 132 (Table 4); Granger, H.C. & R.B. Raup (1962), Recon. study of uranium deposits in AZ, USGS Bull. 1147-A: A25-A29.
Wulfenite
Formula: Pb(MoO4)
Reference: MRDS database Dep. ID file #10039556, MRDS ID #M050276.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Group 2 - Sulphides and Sulfosalts
Chalcocite2.BA.05Cu2S
Chalcopyrite2.CB.10aCuFeS2
Galena2.CD.10PbS
Pyrite2.EB.05aFeS2
Sphalerite2.CB.05aZnS
Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Magnetite4.BB.05Fe2+Fe3+2O4
Pyrolusite4.DB.05Mn4+O2
Uraninite4.DL.05UO2
var: Pitchblende4.DL.05UO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Malachite5.BA.10Cu2(CO3)(OH)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Anglesite7.AD.35PbSO4
Wulfenite7.GA.05Pb(MoO4)
Group 9 - Silicates
Epidote9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-
'Garnet Group'-X3Z2(SiO4)3
'Psilomelane'-

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Chalcocite2.4.7.1Cu2S
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
AX2
Pyrolusite4.4.1.4Mn4+O2
Group 5 - OXIDES CONTAINING URANIUM OR THORIUM
AXO2·xH2O
Uraninite5.1.1.1UO2
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Malachite16a.3.1.1Cu2(CO3)(OH)2
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Anglesite28.3.1.3PbSO4
Group 48 - ANHYDROUS MOLYBDATES AND TUNGSTATES
AXO4
Wulfenite48.1.3.1Pb(MoO4)
Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
Epidote58.2.1a.7{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Unclassified Minerals, Mixtures, etc.
'Chlorite Group'-
'Garnet Group'-X3Z2(SiO4)3
'Psilomelane'-
Uraninite
var: Pitchblende
-UO2

List of minerals for each chemical element

HHydrogen
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
H MalachiteCu2(CO3)(OH)2
CCarbon
C CalciteCaCO3
C MalachiteCu2(CO3)(OH)2
OOxygen
O Uraninite (var: Pitchblende)UO2
O CalciteCaCO3
O Garnet GroupX3Z2(SiO4)3
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O MagnetiteFe2+Fe23+O4
O AnglesitePbSO4
O MalachiteCu2(CO3)(OH)2
O PyrolusiteMn4+O2
O WulfenitePb(MoO4)
O UraniniteUO2
FFluorine
F FluoriteCaF2
AlAluminium
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
SiSilicon
Si Garnet GroupX3Z2(SiO4)3
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
SSulfur
S PyriteFeS2
S ChalcopyriteCuFeS2
S AnglesitePbSO4
S ChalcociteCu2S
S GalenaPbS
S SphaleriteZnS
CaCalcium
Ca FluoriteCaF2
Ca CalciteCaCO3
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
MnManganese
Mn PyrolusiteMn4+O2
FeIron
Fe PyriteFeS2
Fe ChalcopyriteCuFeS2
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe MagnetiteFe2+Fe23+O4
CuCopper
Cu ChalcopyriteCuFeS2
Cu ChalcociteCu2S
Cu MalachiteCu2(CO3)(OH)2
ZnZinc
Zn SphaleriteZnS
MoMolybdenum
Mo WulfenitePb(MoO4)
AuGold
Au GoldAu
PbLead
Pb AnglesitePbSO4
Pb GalenaPbS
Pb WulfenitePb(MoO4)
UUranium
U Uraninite (var: Pitchblende)UO2
U UraniniteUO2

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Quaternary - Miocene
0 - 23.03 Ma



ID: 3185380
Cenozoic sedimentary rocks

Age: Cenozoic (0 - 23.03 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Tithonian - Toarcian
145 - 182.7 Ma



ID: 2737528
Jurassic granitic rocks

Age: Jurassic (145 - 182.7 Ma)

Description: Granite to diorite, locally foliated and locally alkalic; includes Triassic(?) granitoids in the Trigo Mountains. This unit includes two dominant assemblages of igneous rocks. The Kitt Peak-Trigo Peaks superunit includes, from oldest to youngest: dark, foliated or gneissic diorite, medium-grained equigranular to porphyritic granodiorite, and small, irregular intrusions of light-colored, fine-grained granite. The Ko Vaya superunit, limited to south-central Arizona, includes texturally heterogeneous K-feldspar-rich granitic rocks. (150-180 Ma)

Comments: Original map source: Arizona Geological Survey, DI-8 Geologic Map of Arizona, Digital Spatial data for the Geologic Map of Arizona, v. 3.0, edited by S.M. Richard and S.M. Kneale, 2002, 10 p., 2 DOS HD disks. Arc/INFO export file (.e00) format, scale 1:1,000,000.

Lithology: Major:{diorite,alkali granite,granodiorite}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License


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