| Deposit ID | 10310414 |
|---|---|
| MRDS ID | D011054 |
| Record type | Site |
| Current site name | Sandman Project |
| Related records | 10014330 |
| Geographic coordinates: | -117.94074, 41.02978 (WGS84) |
|---|---|
| Relative position | The prospect is located about 10 miles west of Winnemucca on the north side of the Krum Hills . |
Political divisions (FIPS codes)
Humboldt(county)
Nevada(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Barrett Springs(quadrangle 1:24,000 scale)
Osgood Mountains(quadrangle 1:100,000 scale)
McDermitt(quadrangle 1:250,000 scale)
Hydrologic units (watersheds)
Upper Quinn(hydrologic unit)
Black Rock Desert(hydrologic accounting unit)
Black Rock Desert-Humboldt(hydrologic subregion)
Great Basin(hydrologic region)
Federal lands
Bureau of Land Management(Bureau of Land Management NV)
Bureau of Land Management NV BLM(Type of land area)
BLM(Federal land areas administered by BLM)
| Country | State | County |
|---|---|---|
| United States | Nevada | Humboldt |
| Meridian | Township | Range | Section | Fraction | State |
|---|---|---|---|---|---|
| Mount Diablo | 036N | 036E | 04, 05 | Nevada | |
| Mount Diablo | 037N | 036E | 32, 33 | Nevada |
| Commodity | Importance |
|---|---|
| Gold | Primary |
| Silver | Secondary |
| Materials | Type of material |
|---|---|
| Gold | Ore |
| Electrum | Ore |
| Petzite | Ore |
| Quartz | Gangue |
| Adularia | Gangue |
| Model code | 273 |
|---|---|
| USGS model code | 36a |
| Deposit model name | Low-sulfide Au-quartz vein |
| Mark3 model number | 27 |
| Host or associated | Host | ||
|---|---|---|---|
| Rock type | Volcanic Rock (Aphanitic) > Pyroclastic Rock > Tuff | ||
| |||
| Host or associated | Host | ||
|---|---|---|---|
| Rock type | Sedimentary Rock > Mixed Clastic/Volcanic Rock | ||
| Rock type qualifier | volcaniclastic rocks | ||
| |||
| (1) | -117.94074, 41.02978 |
|---|
| Type of structure | Local |
|---|---|
| Structure description | Bedding plane faults and fractures that crosscut bedding, |
| General form | tabular to iregular |
|---|
| Operation type | Surface |
|---|---|
| Development status | Producer |
| Commodity type | Metallic |
| Deposit size | Small |
| Significant | Yes |
| Discovery year | 1900 |
| Discoverer | Santa Fe Pacific (1990s). |
| Year of first production | 1925 |
| Year of last production | 1940 |
| Production years | early 1900s to the 1940s |
| District name | Ten Mile District |
|---|
| Ownership category | BLM Administrative Area |
|---|---|
| Area name | Winnemucca BLM District |
| Type | Owner-Operator |
|---|---|
| Owner | Santa Fe Pacific (1990s) |
| Year | 1990 |
NBMG Map 91, 2nd, 3rd; Santa Fe Company Co. Report 1998? in GSN SP31, 1999
D.A. Davis and J. V. Tingley, 1999, Gold and silver resources in Nevada, NBMG Map 120
Bowell, R.J., Hunerlach, M.P., Parshley, J., and Sears, S., 2000, The Ten Mile mining district, Winnemucca, Nevada: Geology, mineralogy and supergene gold enrichment, in Cluer, J.K., Price, J.G., Struhsacker, E.M., Hardyman, R.F., and Morris, C.L., eds., Geology and ore Deposits 2000: The Great Basin and Beyond: Geological Society of Nevada Symposium Proceedings, Reno/Sparks, May 2000, p. 349-363.
Willden, R., 1964, Geology and mineral deposits of Humboldt County, Nevada: Nevada Bureau of Mines and Geology Bulletin 59, 154 p.
| Subject category | Comment text |
|---|---|
| Deposit | Mineralization occurs in Tertiary tuffaceous and volcaniclastic rocks. Mineralization is comprised of stockworks and veins which are typically open spaced and vuggy grading into wider silicified zones at depth.High-grade gold pockets (typically greater than 30 g/t Au (1 opt Au) were located with a metal detector and appear to be localized along a fault surface. Most of the gold is found along the footwall, where open-space-filling occurred during gold deposition; gold was concentrated in areas where solutions pooled. The presence of some microbreccia and pebble-breccia fragments suggest that the fault was reactivated post-mineralization. Occasionally euhedral gold leaves are found rolled up with and within small breccia fragments, also indicating post gold movement. Mineralization appears to follow bedding plane faults and fractures that crosscut bedding, the largest observed gold-bearing vein strikes N. 55-60E and dips to the 55-65 NW. A second location where gold was found in situ is at the intersection of N-S and NE-SW- trending structures that converge and can be traced to the surface. Evidence exists of supergene enrichment in the upper zones where some exceptionally rich pockets of gold were found concentrated in favorable structural traps. Thus, crystalline native gold is believed to be bi-modal in origin. Primary gold is represented by electrum (600-650 gold fineness) and minor petzite associated with partially oxidized pyrite and secondary alteration products in a gangue of quartz and adularia. The electrum forms crystalline leaves, reticulated dendrites, and rough grains. The second form, believed to be supergene has a much higher fineness and often forms small platelets, wires, and euhedral crystals derived from altered protore and concentrated by residual and supergene processes in the oxidized levels of the mines. The structurally controlled small, bonanza style gold deposits are hosted in Tertiary tuffaceous and volcaniclastic rocks, mostly under pediment gravels and sand. |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-MAY-2004 | LaPointe, D.D. | Nevada Bureau of Mines and Geology | |
| Editor | 01-SEP-2007 | Schruben, Paul G. | U.S. Geological Survey | Converted from S&A FileMaker format to Oracle. Edit checks on rocks, units, and ages with Geolex search, and other fields. |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.
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