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Last Chance Mine (Shoup Mn Mine; Baxter Denison Mine; Black Diamond), Iron Mine Draw (Iron Mine Canyon), Clints Well, Long Valley Mining District, Coconino County, Arizona, USAi
Regional Level Types
Last Chance Mine (Shoup Mn Mine; Baxter Denison Mine; Black Diamond)Mine
Iron Mine Draw (Iron Mine Canyon)Valley
Clints WellVillage
Long Valley Mining DistrictMining District
Coconino CountyCounty
ArizonaState
USACountry

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Latitude & Longitude (WGS84):
34° 34' 15'' North , 111° 19' 54'' West
Latitude & Longitude (decimal):
Type:
Nearest Settlements:
PlacePopulationDistance
Whispering Pines148 (2011)22.6km
Strawberry961 (2011)23.4km
Pine1,963 (2011)23.6km
East Verde Estates170 (2017)30.4km
Mesa del Caballo765 (2011)31.9km
Mindat Locality ID:
27439
Long-form identifier:
mindat:1:2:27439:8
GUID (UUID V4):
e9f0046b-4cbb-4a3d-ad38-25760d2be28c
Other/historical names associated with this locality:
Bosley Mining Co.; McCloskey group; Denison Manganese; J. Reed Denison; Linesba; Shafer Manganese;


A former Mn occurrence/group of 5 claims/mine located in the center sec. 30, T14N, R10E, G&SRM, 2.5 km (1.6 miles) NW of Clints Well. Also has components termed patented claims MS 4291 & unpatented claims MS 4383, 4466 & 4467. Owned by George W. Grimes, L.A. Hough, and J.J. Chiles, of Pine, Arizona. The USGS MRDS database stated accuracy for this locality is 100 meters.

Mineralization is deposits of Mn ore that occur near the surface as replacement bodies in decomposed limestone and sandstone and in breccias of the same forms. The area is 1½ miles long and a mile wide. The local limestone and sandstone are decomposed several feet below the surface and are stained in shades of yellow, red, brown, and black from iron and manganese oxides.

The manganese oxides occur in nodules and masses in the decomposed rock, replace the limestone and sandstone in varying degrees, and form the cementing substance of breccias. Nodules and masses of manganese oxides composed largely of psilomelane are scattered over the surface and are found in decomposed rock to a depth of a few feet. Some of the masses are 2 feet (60 cm) diameter and weigh hundreds of pounds. The psilomelane has a peculiar structure. Most specimens collected are vesicular and ropy in appearance, but when broken open are found to be composed of columnar rods 1 or 2 inches (2.5 to 5 cm) long deposited in concentric crusts. Brown iron oxide has been deposited in the interstices of this ore.

Below the bunches and masses of the purer psilomelane ore found near the surface are masses of manganese and iron oxides which partly replace limestone and sandstone along the bedding planes. In some places the manganese and iron oxides are mixed, but generally the manganese oxides are in streaks and masses encased by iron oxides. Local rocks include Permian sedimentary rocks.

Workings include surface & underground openings comprised of 10 or more shallow shafts and open cuts and short tunnels (1928). The deepest shaft is 25 feet (1918).

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1 valid mineral.

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List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Pyrolusite4.DB.05Mn4+O2
Unclassified
'Psilomelane'-

List of minerals for each chemical element

OOxygen
O PyrolusiteMn4+O2
MnManganese
Mn PyrolusiteMn4+O2

Other Databases

Link to USGS MRDS:10210135

Localities in this Region

  • Arizona
    • Coconino County
      • Long Valley Mining District
        • Clints Well
          • Iron Mine Draw (Iron Mine Canyon)

Other Regions, Features and Areas containing this locality


This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. 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.

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