Tightner Mine (Tightner Mines), 16 to 1 Mine (Sixteen-to-One Mine; Original Sixteen-to-One Mine), Alleghany, Alleghany Mining District (Forest Mining District), Sierra County, California, USAi
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Latitude & Longitude (WGS84):
39° 28' 5'' North , 120° 50' 18'' West
Latitude & Longitude (decimal):
Type:
KΓΆppen climate type:
Nearest Settlements:
Place | Population | Distance |
---|---|---|
Downieville | 282 (2011) | 10.2km |
Washington | 185 (2011) | 12.5km |
Pike | 134 (2011) | 14.1km |
Camptonville | 158 (2011) | 18.1km |
Sierra City | 221 (2011) | 20.6km |
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
Local clubs are the best way to get access to collecting localities
Club | Location | Distance |
---|---|---|
Nevada County Gem & Mineral Society | Grass Valley, California | 34km |
Mindat Locality ID:
93640
Long-form identifier:
mindat:1:2:93640:7
GUID (UUID V4):
42d82c0a-c607-4f8b-b767-37515b3949d0
A former lode Au occurrence/mine located in sec. 34, T19N, R10E, MDM, 0.5 km (0.3 mile) ESE of Alleghany, along the North Fork Kanake Creek, near its confluence with the main channel, on National Forest land. MRDS database stated accuracy for this location is 100 meters.
The Sixteen-to-One and the Tightner shafts were originally the principal means of access for the two competing Sixteen-to-One mines and Tightner mines until the Tightner was acquired by the Sixteen to-One in 1924. Both saw continued usage until 1954 when a fire obstructed access in the Tightner shaft, after which the Sixteen-to-One shaft became the main mine access. The Tightner shaft was maintained for pumping, servicing, and ventilation (Carlson and Clark, 1956).
Local rocks include undivided pre-Cenozoic metavolcanic rocks, unit 2 (undivided).
Workings include underground openings.
The mine developed the Sixteen-to-One vein via two primary inclined shafts (technically winzes), the Sixteen-to-One and Tightner, and two main winzes, the 49 and 83. The Tightner shaft developed the northern half of the mine. The shaft is collared at the 250-foot level and then inclined to the east following the dip of the vein to the deepest level of the mine at 3,000 feet. The upper part of the shaft was driven at an angle of about 35? to only 2,100 due to limited hoist capacity. North and south drifts were driven every 100 feet to the 1,100-foot level, then every 200 feet to the 1,700-level. Limited exploratory drifts were driven at the 1,800-foot level in the hanging wall of the fault zone and within the fault zone at the 2,100-foot level. The lower part of the shaft was sunk separately and at a steeper angle of about 60?. The steeper incline was necessitated by downward offset of the Sixteen-to-One vein in the footwall of the "2,100 fault zone" and by steeper dips on the vein below the fault zone. The lower section penetrated the vein at the 2,700-level, and crosscuts were driven to the west and east to drifts on the 2,700- and 3,000-foot levels.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
β Arsenopyrite Formula: FeAsS |
β Calcite Formula: CaCO3 |
β Dolomite Formula: CaMg(CO3)2 |
β Galena Formula: PbS |
β Gold Formula: Au |
β Muscovite Formula: KAl2(AlSi3O10)(OH)2 |
β Muscovite var. Mariposite Formula: K(Al,Cr)2(Al,Si)4O10(OH)2 |
β Muscovite var. Phengite Formula: KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
β Quartz Formula: SiO2 |
β Talc Formula: Mg3Si4O10(OH)2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 1 - Elements | |||
---|---|---|---|
β | Gold | 1.AA.05 | Au |
Group 2 - Sulphides and Sulfosalts | |||
β | Galena | 2.CD.10 | PbS |
β | Arsenopyrite | 2.EB.20 | FeAsS |
Group 4 - Oxides and Hydroxides | |||
β | Quartz | 4.DA.05 | SiO2 |
Group 5 - Nitrates and Carbonates | |||
β | Calcite | 5.AB.05 | CaCO3 |
β | Dolomite | 5.AB.10 | CaMg(CO3)2 |
Group 9 - Silicates | |||
β | Talc | 9.EC.05 | Mg3Si4O10(OH)2 |
β | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
β | var. Phengite | 9.EC.15 | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
β | var. Mariposite | 9.EC.15 | K(Al,Cr)2(Al,Si)4O10(OH)2 |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | β Muscovite | KAl2(AlSi3O10)(OH)2 |
H | β Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
H | β Talc | Mg3Si4O10(OH)2 |
H | β Muscovite var. Mariposite | K(Al,Cr)2(Al,Si)4O10(OH)2 |
C | Carbon | |
C | β Calcite | CaCO3 |
C | β Dolomite | CaMg(CO3)2 |
O | Oxygen | |
O | β Calcite | CaCO3 |
O | β Dolomite | CaMg(CO3)2 |
O | β Muscovite | KAl2(AlSi3O10)(OH)2 |
O | β Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
O | β Quartz | SiO2 |
O | β Talc | Mg3Si4O10(OH)2 |
O | β Muscovite var. Mariposite | K(Al,Cr)2(Al,Si)4O10(OH)2 |
Mg | Magnesium | |
Mg | β Dolomite | CaMg(CO3)2 |
Mg | β Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
Mg | β Talc | Mg3Si4O10(OH)2 |
Al | Aluminium | |
Al | β Muscovite | KAl2(AlSi3O10)(OH)2 |
Al | β Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
Al | β Muscovite var. Mariposite | K(Al,Cr)2(Al,Si)4O10(OH)2 |
Si | Silicon | |
Si | β Muscovite | KAl2(AlSi3O10)(OH)2 |
Si | β Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
Si | β Quartz | SiO2 |
Si | β Talc | Mg3Si4O10(OH)2 |
Si | β Muscovite var. Mariposite | K(Al,Cr)2(Al,Si)4O10(OH)2 |
S | Sulfur | |
S | β Arsenopyrite | FeAsS |
S | β Galena | PbS |
K | Potassium | |
K | β Muscovite | KAl2(AlSi3O10)(OH)2 |
K | β Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
K | β Muscovite var. Mariposite | K(Al,Cr)2(Al,Si)4O10(OH)2 |
Ca | Calcium | |
Ca | β Calcite | CaCO3 |
Ca | β Dolomite | CaMg(CO3)2 |
Cr | Chromium | |
Cr | β Muscovite var. Mariposite | K(Al,Cr)2(Al,Si)4O10(OH)2 |
Fe | Iron | |
Fe | β Arsenopyrite | FeAsS |
Fe | β Muscovite var. Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
As | Arsenic | |
As | β Arsenopyrite | FeAsS |
Au | Gold | |
Au | β Gold | Au |
Pb | Lead | |
Pb | β Galena | PbS |
Other Databases
Link to USGS MRDS: | 10077649 |
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References
(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file #0060910228