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Bear Basin Mines, Buena Vista Mining District, King County, Washington, USAi
| Regional Level Types | |
|---|---|
| Bear Basin Mines | Group of Mines |
| Buena Vista Mining District | Mining District |
| King County | County (Historical) |
| Washington | State |
| USA | Country |
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Latitude & Longitude (WGS84):
47° 38' 22'' North , 121° 29' 10'' West
Latitude & Longitude (decimal):
Type:
Group of Mines
Köppen climate type:
Other/historical names associated with this locality:
Bear Basin property; Bear Creek prospects; Snoqualmie Mines; Cascade Mines
25 MI BY ROAD FROM NORTH BEND; ABOUT 0.5 MI NORTHWEST OF LENNOX LAKE.
A Ag-Pb-Cu-Au-Sb-Sn-As occurrence/group of mines located in the SW¼ sec. 13, SE¼ sec. 14, NE¼ sec. 23 & in the NW¼ sec. 24, T25N, R10E, WM, 25 miles by road from North End (town), about 0.5 mile NW of Lennox Lake, in/around the glacial cirque at the head of Bear Creek, on National Forest wilderness land (Alpine Lakes Wilderness In Mount Baker-Snoqualmie National Forest). Owned by the Bear Basin Mining Company, Bremerton, Washington (1952-). The claims were registered in 1905 and the last major work occurred in 1934. The USGS MRDS database stated accuracy for this locality is 10 meters.
Mineralization is a polymetallic deposit (Mineral occurrence model information: Model code: 85; USGS model code: 22c; Deposit model name: Polymetallic veins; Mark3 model number: 46), hosted in Miocene diorite of the Northern Phaase of the Snoqualmie BAtholith. The ore body is a vein deposit that strikes N75W & N50W, dips 75-80SW & steep, at a thickness of 1.22 meters, and a length of 1,066.8 meters. Two sets of mineralized shear zones contain quartz stringers at 5.9 feet wide in adit No. 3. Other adits were also driven on shear zones. Local alteration includes sericitization, kaolinization and silicification. Local rocks include Tertiary granitic rocks.
Local geologic structures include steeply-dipping shear zones.
Workings include underground openings. There are 8 adits and a winze in the basin that had a total of 2,165 feet of workings which were driven by the Snoqualmie Mining Company. The company built a small mill on the creek around 1917. A 1,500 foot long aerial tram was built to the No. 3 adit then moved to the No. 6. Before this tram could be used, the mill burned down in 1934 and little has been done since. As of 2015, adits No. 2 and No. 8 are collapsed.
Production was a small quantity of Ag produced by 1922.
The mines assayed high in silver and showed some gold. Analytical data results: Sample in adit assayed 0.06 ounce/ton Au, 16.9 ounce/ton Ag, 0.13% Zn. Samples from adit No. 3 showed 0.1-33.7 ounces/ton Ag, a maximum of 0.05 ounce/ton Au, and a maximum of 0.16% Cu.
Reserves are estimated to be small but several areas may be favorable for exploration.
A Ag-Pb-Cu-Au-Sb-Sn-As occurrence/group of mines located in the SW¼ sec. 13, SE¼ sec. 14, NE¼ sec. 23 & in the NW¼ sec. 24, T25N, R10E, WM, 25 miles by road from North End (town), about 0.5 mile NW of Lennox Lake, in/around the glacial cirque at the head of Bear Creek, on National Forest wilderness land (Alpine Lakes Wilderness In Mount Baker-Snoqualmie National Forest). Owned by the Bear Basin Mining Company, Bremerton, Washington (1952-). The claims were registered in 1905 and the last major work occurred in 1934. The USGS MRDS database stated accuracy for this locality is 10 meters.
Mineralization is a polymetallic deposit (Mineral occurrence model information: Model code: 85; USGS model code: 22c; Deposit model name: Polymetallic veins; Mark3 model number: 46), hosted in Miocene diorite of the Northern Phaase of the Snoqualmie BAtholith. The ore body is a vein deposit that strikes N75W & N50W, dips 75-80SW & steep, at a thickness of 1.22 meters, and a length of 1,066.8 meters. Two sets of mineralized shear zones contain quartz stringers at 5.9 feet wide in adit No. 3. Other adits were also driven on shear zones. Local alteration includes sericitization, kaolinization and silicification. Local rocks include Tertiary granitic rocks.
Local geologic structures include steeply-dipping shear zones.
Workings include underground openings. There are 8 adits and a winze in the basin that had a total of 2,165 feet of workings which were driven by the Snoqualmie Mining Company. The company built a small mill on the creek around 1917. A 1,500 foot long aerial tram was built to the No. 3 adit then moved to the No. 6. Before this tram could be used, the mill burned down in 1934 and little has been done since. As of 2015, adits No. 2 and No. 8 are collapsed.
Production was a small quantity of Ag produced by 1922.
The mines assayed high in silver and showed some gold. Analytical data results: Sample in adit assayed 0.06 ounce/ton Au, 16.9 ounce/ton Ag, 0.13% Zn. Samples from adit No. 3 showed 0.1-33.7 ounces/ton Ag, a maximum of 0.05 ounce/ton Au, and a maximum of 0.16% Cu.
Reserves are estimated to be small but several areas may be favorable for exploration.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
21 valid minerals. 1 (TL) - type locality of valid minerals.
Rock Types Recorded
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
| ⓘ Albite Formula: Na(AlSi3O8) Habit: shrp crystlas to 1/2" Colour: white References: |
| ⓘ 'Andorite' Formula: AgPbSb3S6 Habit: grains and poorly formed crystals References: |
| ⓘ Arsenopyrite Formula: FeAsS |
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ 'Chlorite Group' References: |
| ⓘ Coronadite Formula: Pb(Mn4+6Mn3+2)O16 References: Dr. Günter Grundmann collectionIdentified by Dr. Günter Grundmann: Polarised-light microscopy |
| ⓘ 'Freibergite Subgroup' Formula: (Ag6,[Ag6]4+)(Cu4 C2+2)Sb4S12S0-1 |
| ⓘ Galena Formula: PbS |
| ⓘ Jamesonite Formula: Pb4FeSb6S14 |
| ⓘ Kaolinite Formula: Al2(Si2O5)(OH)4 |
| ⓘ Lasmanisite (TL) Formula: Ag12Pb13Mn11Sb44S96 Type Locality: |
| ⓘ Molybdenite Formula: MoS2 |
| ⓘ Muscovite Formula: KAl2(AlSi3O10)(OH)2 |
| ⓘ Muscovite var. Sericite Formula: KAl2(AlSi3O10)(OH)2 |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Quatrandorite Formula: AgPbSb3S6 References: Dr. Günter Grundmann collectionIdentified by Dr. Günter Grundmann: Polarised-light microscopy |
| ⓘ Ramdohrite ? Formula: Pb5.9Fe0.1Mn0.1In0.1Cd0.2Ag2.8Sb10.8S24 Description: Analytical details needed. References: |
| ⓘ Rhodochrosite Formula: MnCO3 References: |
| ⓘ Senandorite Formula: AgPbSb3S6 References: Dr. Günter Grundmann collectionIdentified by Dr. Günter Grundmann: Polarised-light microscopy |
| ⓘ Sphalerite Formula: ZnS |
| ⓘ Stannite Formula: Cu2FeSnS4 |
| ⓘ Stibnite Formula: Sb2S3 |
| ⓘ 'Tetrahedrite Subgroup' Formula: Cu6(Cu4C2+2)Sb4S12S |
| ⓘ Todorokite Formula: (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O References: Dr. Günter Grundmann collectionIdentified by Dr. Günter Grundmann: Polarised-light microscopy |
| ⓘ 'Tourmaline' Formula: AD3G6(T6O18)(BO3)3X3Z References: |
| ⓘ Uchucchacuaite Formula: AgMnPb3Sb5S12 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Stannite | 2.CB.15a | Cu2FeSnS4 |
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Stibnite | 2.DB.05 | Sb2S3 |
| ⓘ | Molybdenite | 2.EA.30 | MoS2 |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| ⓘ | Arsenopyrite | 2.EB.20 | FeAsS |
| ⓘ | 'Freibergite Subgroup' | 2.GB.05 | (Ag6,[Ag6]4+)(Cu4 C2+2)Sb4S12S0-1 |
| ⓘ | 'Tetrahedrite Subgroup' | 2.GB.05 | Cu6(Cu4C2+2)Sb4S12S |
| ⓘ | Jamesonite | 2.HB.15 | Pb4FeSb6S14 |
| ⓘ | Senandorite | 2.JB. | AgPbSb3S6 |
| ⓘ | Lasmanisite (TL) | 2.JB. | Ag12Pb13Mn11Sb44S96 |
| ⓘ | Ramdohrite ? | 2.JB.40a | Pb5.9Fe0.1Mn0.1In0.1Cd0.2Ag2.8Sb10.8S24 |
| ⓘ | Uchucchacuaite | 2.JB.40a | AgMnPb3Sb5S12 |
| ⓘ | Quatrandorite | 2.JB.40a | AgPbSb3S6 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| ⓘ | Coronadite | 4.DK.05a | Pb(Mn4+6Mn3+2)O16 |
| ⓘ | Todorokite | 4.DK.10 | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Rhodochrosite | 5.AB.05 | MnCO3 |
| Group 9 - Silicates | |||
| ⓘ | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | var. Sericite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | Kaolinite | 9.ED.05 | Al2(Si2O5)(OH)4 |
| ⓘ | Albite | 9.FA.35 | Na(AlSi3O8) |
| Unclassified | |||
| ⓘ | 'Andorite' | - | AgPbSb3S6 |
| ⓘ | 'Chlorite Group' | - | |
| ⓘ | 'Tourmaline' | - | AD3G6(T6O18)(BO3)3X3Z |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Kaolinite | Al2(Si2O5)(OH)4 |
| H | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| H | ⓘ Todorokite | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
| H | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| B | Boron | |
| B | ⓘ Tourmaline | AD3G6(T6O18)(BO3)3X3Z |
| C | Carbon | |
| C | ⓘ Rhodochrosite | MnCO3 |
| O | Oxygen | |
| O | ⓘ Albite | Na(AlSi3O8) |
| O | ⓘ Coronadite | Pb(Mn64+Mn23+)O16 |
| O | ⓘ Kaolinite | Al2(Si2O5)(OH)4 |
| O | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Rhodochrosite | MnCO3 |
| O | ⓘ Todorokite | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
| O | ⓘ Tourmaline | AD3G6(T6O18)(BO3)3X3Z |
| O | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Na | Sodium | |
| Na | ⓘ Albite | Na(AlSi3O8) |
| Na | ⓘ Todorokite | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
| Mg | Magnesium | |
| Mg | ⓘ Todorokite | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
| Al | Aluminium | |
| Al | ⓘ Albite | Na(AlSi3O8) |
| Al | ⓘ Kaolinite | Al2(Si2O5)(OH)4 |
| Al | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Al | ⓘ Todorokite | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
| Al | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Si | Silicon | |
| Si | ⓘ Albite | Na(AlSi3O8) |
| Si | ⓘ Kaolinite | Al2(Si2O5)(OH)4 |
| Si | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| S | Sulfur | |
| S | ⓘ Andorite | AgPbSb3S6 |
| S | ⓘ Arsenopyrite | FeAsS |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Freibergite Subgroup | (Ag6,[Ag6]4+)(Cu4 C22+)Sb4S12S0-1 |
| S | ⓘ Galena | PbS |
| S | ⓘ Jamesonite | Pb4FeSb6S14 |
| S | ⓘ Molybdenite | MoS2 |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Ramdohrite | Pb5.9Fe0.1Mn0.1In0.1Cd0.2Ag2.8Sb10.8S24 |
| S | ⓘ Sphalerite | ZnS |
| S | ⓘ Stannite | Cu2FeSnS4 |
| S | ⓘ Stibnite | Sb2S3 |
| S | ⓘ Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
| S | ⓘ Uchucchacuaite | AgMnPb3Sb5S12 |
| S | ⓘ Quatrandorite | AgPbSb3S6 |
| S | ⓘ Senandorite | AgPbSb3S6 |
| S | ⓘ Lasmanisite | Ag12Pb13Mn11Sb44S96 |
| K | Potassium | |
| K | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| K | ⓘ Todorokite | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
| K | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Ca | Calcium | |
| Ca | ⓘ Todorokite | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
| Mn | Manganese | |
| Mn | ⓘ Coronadite | Pb(Mn64+Mn23+)O16 |
| Mn | ⓘ Ramdohrite | Pb5.9Fe0.1Mn0.1In0.1Cd0.2Ag2.8Sb10.8S24 |
| Mn | ⓘ Rhodochrosite | MnCO3 |
| Mn | ⓘ Todorokite | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
| Mn | ⓘ Uchucchacuaite | AgMnPb3Sb5S12 |
| Mn | ⓘ Lasmanisite | Ag12Pb13Mn11Sb44S96 |
| Fe | Iron | |
| Fe | ⓘ Arsenopyrite | FeAsS |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Jamesonite | Pb4FeSb6S14 |
| Fe | ⓘ Pyrite | FeS2 |
| Fe | ⓘ Ramdohrite | Pb5.9Fe0.1Mn0.1In0.1Cd0.2Ag2.8Sb10.8S24 |
| Fe | ⓘ Stannite | Cu2FeSnS4 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Cu | ⓘ Freibergite Subgroup | (Ag6,[Ag6]4+)(Cu4 C22+)Sb4S12S0-1 |
| Cu | ⓘ Stannite | Cu2FeSnS4 |
| Cu | ⓘ Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
| As | Arsenic | |
| As | ⓘ Arsenopyrite | FeAsS |
| Sr | Strontium | |
| Sr | ⓘ Todorokite | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
| Mo | Molybdenum | |
| Mo | ⓘ Molybdenite | MoS2 |
| Ag | Silver | |
| Ag | ⓘ Andorite | AgPbSb3S6 |
| Ag | ⓘ Freibergite Subgroup | (Ag6,[Ag6]4+)(Cu4 C22+)Sb4S12S0-1 |
| Ag | ⓘ Ramdohrite | Pb5.9Fe0.1Mn0.1In0.1Cd0.2Ag2.8Sb10.8S24 |
| Ag | ⓘ Uchucchacuaite | AgMnPb3Sb5S12 |
| Ag | ⓘ Quatrandorite | AgPbSb3S6 |
| Ag | ⓘ Senandorite | AgPbSb3S6 |
| Ag | ⓘ Lasmanisite | Ag12Pb13Mn11Sb44S96 |
| Cd | Cadmium | |
| Cd | ⓘ Ramdohrite | Pb5.9Fe0.1Mn0.1In0.1Cd0.2Ag2.8Sb10.8S24 |
| In | Indium | |
| In | ⓘ Ramdohrite | Pb5.9Fe0.1Mn0.1In0.1Cd0.2Ag2.8Sb10.8S24 |
| Sn | Tin | |
| Sn | ⓘ Stannite | Cu2FeSnS4 |
| Sb | Antimony | |
| Sb | ⓘ Andorite | AgPbSb3S6 |
| Sb | ⓘ Freibergite Subgroup | (Ag6,[Ag6]4+)(Cu4 C22+)Sb4S12S0-1 |
| Sb | ⓘ Jamesonite | Pb4FeSb6S14 |
| Sb | ⓘ Ramdohrite | Pb5.9Fe0.1Mn0.1In0.1Cd0.2Ag2.8Sb10.8S24 |
| Sb | ⓘ Stibnite | Sb2S3 |
| Sb | ⓘ Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
| Sb | ⓘ Uchucchacuaite | AgMnPb3Sb5S12 |
| Sb | ⓘ Quatrandorite | AgPbSb3S6 |
| Sb | ⓘ Senandorite | AgPbSb3S6 |
| Sb | ⓘ Lasmanisite | Ag12Pb13Mn11Sb44S96 |
| Ba | Barium | |
| Ba | ⓘ Todorokite | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
| Pb | Lead | |
| Pb | ⓘ Andorite | AgPbSb3S6 |
| Pb | ⓘ Coronadite | Pb(Mn64+Mn23+)O16 |
| Pb | ⓘ Galena | PbS |
| Pb | ⓘ Jamesonite | Pb4FeSb6S14 |
| Pb | ⓘ Ramdohrite | Pb5.9Fe0.1Mn0.1In0.1Cd0.2Ag2.8Sb10.8S24 |
| Pb | ⓘ Uchucchacuaite | AgMnPb3Sb5S12 |
| Pb | ⓘ Quatrandorite | AgPbSb3S6 |
| Pb | ⓘ Senandorite | AgPbSb3S6 |
| Pb | ⓘ Lasmanisite | Ag12Pb13Mn11Sb44S96 |
Other Databases
| Link to USGS MRDS: | 10094251 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Cascade RangeMountain Range
North America PlateTectonic Plate
- Cascade ArcVolcanic Arc
- Franciscan DomainDomain
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Bear Basin Mines, Buena Vista Mining District, King County, Washington, USA