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O. B. Joyful Mine (Thurman; O. B. J.; O.B.J. Mine; J. Mine; Tyler and Aster; Panamint Mines Company), Wildrose Spring, Wildrose District (Wild Rose District), Panamint Mts (Panamint Range), Inyo Co., California, USA

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A former Au-Ag-Pb-Mn-Fe mine located in sec. 9, T20S, R44E, MDM, 5.9 km (3.7 miles) S of Wildrose Spring (6.9 miles W of Bennett Peak), and S of Tuber Canyon, on National Park Service wilderness land (Death Valley National Park/Death Valley Wilderness). Discovered in 1893. MRDS database stated accuracy for this location is 1,000 meters. Consolidated with the Thurman and Aster Mines comprising 14 claims. Location projected, land unsurveyed.

Mineralization is a vein deposit hosted in hornblendite, schist & diorite. The ore body is lenticular & pinch & swell in form. Controls for ore emplacement included the 2 fault systems, one N45E, dipping 30SE, and the other N40W, dipping 45 NE. The veins are brecciated. Where the veins are thick, brecciation of quartz is confined to the portions adjacent to the wallrock. Ore occurs as a loose, friable vein filling of brecciated quartz and as brecciated schist wallrock. Ores of the Tyler Mine occur in the first case, while ores of the Aster Mine are representative of the latter. Ore bodies are 1 to 30 feet thick separated by pinches in vein or lenses overlapping with narrow layers of schist in between. Encrustations of gypsum are visible everywhere on both veins. Local rocks include Precambrian rocks, undivided, unit 1 (Death Valley).

Local geologic structures include 2 fault systems. The first is an overthrust of large displacement. The second system is a normal fault system of small displacement.

Workings include surface and underground openings with a length of 1,310.64 meters. 2000 feet separate workings on the Tyler and Aster Mines. Principal development was on the Tyler Mine. A 900 foot tunnel was driven SE on then 4th level. 800 feet from its portal it cuts a fault striking N20W and dipping 20SW. Another fault known as the "cut-off fault" was found on surface about 150 to 200 feet E of the main tunnel. It strikes NW and dips 45 NE. The vein was not encountered in the main tunnel, supposition being that it was displaced by one, or both, of these faults. At 200 feet from the portal, a drift was run W 100 feet. A raise encountered the vein 20 feet above level. The vein is intact vertically 200 feet to surface. On a level 80 feet above the tunnel level, the vein was prospected for 400 feet with much stoping. One stope above this level was 90 feet long, 100 feet high. and 22 feet wide. Two shafts, known as the North shaft and the South shaft, 200 feet apart, were sunk on this level. Development in the Aster Mine consisted of a series of open cuts, a 60 foot deep shaft and a 100 foot tunnel.

Production data are found in: Tucker, W. Burling (1926); Sampson, Reid J. (1932b).

Ore averaged $12/ton in Au (period values). In July, 1932, 8 tons of selected ore was shipped from the open cuts. It returned $135/ton (period values), of which 9.5% was Pb, 10 ounces Ag/ton, and the remainder of values in Au. No other production records were found.

The hanging wall shoot of 4 feet thickness valued at $21.32 (period values) per ton from 750 tons of ore. The full thickness of the vein was 15 feet, valued at $4.50/ton (period values) from 15,000 tons of ore (data for the Aster Mine). Nodules of sulfides in the Aster Mine assayed from 8.20 to 9.75 ounces/ton Au.

Mineral List



5 entries listed. 5 valid minerals.

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References

Tucker, W. Burling (1926), Inyo County: California Journal of Mines and Geology, California Mining Bureau. (Report 22): 22(4): 471-472.

Sampson, Reid J. (1932b), Mineral resources of a part of the Panamint Range: California Mining Bureau. Report 28: 371-372.

Tucker, W. Burling & Reid J. Sampson (1938), Mineral resources of Inyo County, California: California Journal of Mines and Geology; California Division of Mines (Report 34): 34(4): 413-414.

Norman, L.A. & Richard M. Stewart (1951), Mines and mineral resources of Inyo County, California: California Journal of Mines and Geology (Report 47): 47(1): 159.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10036124 & 10260472.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060270502.

 
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