Magnolia Mining District, Boulder County, Colorado, USAi
| Regional Level Types | |
|---|---|
| Magnolia Mining District | Mining District |
| Boulder County | County |
| Colorado | State |
| USA | Country |
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The Magnolia mining district lies, about 5 miles due west of Boulder and about a mile south of Middle Boulder Creek. The district is about 1,400 feet above the valley bottom.
Most of the productive veins crop out in an area of less than a square mile and the outcrops range in altitude from approximately 7,000 feet at the Graphic vein to about 7,700 feet at the Kekionga shaft a mile to the southwest.
Gold-telluride ore was found on the Magnolia vein in 1875 and during the next 2 years nearly all the veins now known in the district were discovered. Because of the high tenor of the ore and its erratic distribution in rich pockets, company mining and milling by absentee landlords has seldom been successful, and the district does not have a large output on record.
All the ore deposits in the Magnolia district are fissure fillings; mineralization has been chiefly of the gold-tel1urille type but some tungsten ore has been mined. Gangue minerals are present in only minor quantity and consist of little but light-colored to dark-colored varieties of extremely fine grained quartz "horn".
The district is noted for the variety of telluride minerals found and for the unusual association of gold tellurides with tungsten, molybdenum, and vanadium minerals.
Most of the productive veins crop out in an area of less than a square mile and the outcrops range in altitude from approximately 7,000 feet at the Graphic vein to about 7,700 feet at the Kekionga shaft a mile to the southwest.
Gold-telluride ore was found on the Magnolia vein in 1875 and during the next 2 years nearly all the veins now known in the district were discovered. Because of the high tenor of the ore and its erratic distribution in rich pockets, company mining and milling by absentee landlords has seldom been successful, and the district does not have a large output on record.
All the ore deposits in the Magnolia district are fissure fillings; mineralization has been chiefly of the gold-tel1urille type but some tungsten ore has been mined. Gangue minerals are present in only minor quantity and consist of little but light-colored to dark-colored varieties of extremely fine grained quartz "horn".
The district is noted for the variety of telluride minerals found and for the unusual association of gold tellurides with tungsten, molybdenum, and vanadium minerals.
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Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded from this region.Mineral List
Mineral list contains entries from the region specified including sub-localities38 valid minerals. 3 (TL) - type locality of valid minerals.
Rock Types Recorded
Rock list contains entries from the region specified including sub-localities
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Alphabetical List Tree DiagramDetailed Mineral List:
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Silver var. Amalgam | 1.AA.05 | (Ag,Hg) |
| ⓘ | Native Gold | 1.AA.05 | Au |
| ⓘ | Native Silver | 1.AA.05 | Ag |
| ⓘ | Native Mercury | 1.AD.05 | Hg |
| ⓘ | Weishanite | 1.AD.20a | (Au,Ag,Hg) |
| ⓘ | Native Tellurium | 1.CC.10 | Te |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Rickardite | 2.BA.30 | Cu7Te5 |
| ⓘ | Hessite | 2.BA.60 | Ag2Te |
| ⓘ | Petzite | 2.BA.75 | Ag3AuTe2 |
| ⓘ | Coloradoite (TL) | 2.CB.05a | HgTe |
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Empressite | 2.CB.80 | AgTe |
| ⓘ | Pyrrhotite | 2.CC.10 | Fe1-xS |
| ⓘ | Altaite | 2.CD.10 | PbTe |
| ⓘ | Stibnite | 2.DB.05 | Sb2S3 |
| ⓘ | Sylvanite | 2.EA.05 | AgAuTe4 |
| ⓘ | Calaverite | 2.EA.10 | AuTe2 |
| ⓘ | Melonite | 2.EA.20 | NiTe2 |
| ⓘ | Molybdenite | 2.EA.30 | MoS2 |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| ⓘ | Marcasite | 2.EB.10a | FeS2 |
| Group 3 - Halides | |||
| ⓘ | Iodargyrite | 3.AA.10 | AgI |
| ⓘ | Calomel | 3.AA.30 | [Hg2]2+Cl2 |
| ⓘ | Fluorite | 3.AB.25 | CaF2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Goethite | 4.00. | Fe3+O(OH) |
| ⓘ | Ilmenite | 4.CB.05 | Fe2+TiO3 |
| ⓘ | var. Picrotitanite | 4.CB.05 | Fe2+TiO3 |
| ⓘ | Quartz var. Chalcedony | 4.DA.05 | SiO2 |
| ⓘ | 4.DA.05 | SiO2 | |
| ⓘ | Ferberite | 4.DB.30 | FeWO4 |
| ⓘ | Hübnerite | 4.DB.30 | MnWO4 |
| ⓘ | Tellurite | 4.DE.20 | TeO2 |
| ⓘ | Paratellurite | 4.DE.25 | TeO2 |
| ⓘ | Magnolite (TL) | 4.JK.60 | [Hg2]2+[Te4+O3] |
| ⓘ | Keystoneite (TL) | 4.JM.05 | Mg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Alunite | 7.BC.10 | KAl3(SO4)2(OH)6 |
| Group 9 - Silicates | |||
| ⓘ | Epidote | 9.BG.05a | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| ⓘ | Allanite-(Ce) | 9.BG.05b | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| ⓘ | Roscoelite | 9.EC.15 | KV3+2(AlSi3O10)(OH)2 |
| Unclassified | |||
| ⓘ | 'Chlorite Group' | - | |
| ⓘ | 'Feldspar Group' | - | |
| ⓘ | 'Limonite' | - | |
| ⓘ | 'Mica Group' | - | |
| ⓘ | 'Fayalite-Forsterite Series' | - | |
| ⓘ | 'Garnet Group' | - | X3Z2(SiO4)3 |
| ⓘ | 'Serpentine Subgroup' | - | D3[Si2O5](OH)4 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Allanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| H | ⓘ Alunite | KAl3(SO4)2(OH)6 |
| H | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| H | ⓘ Goethite | Fe3+O(OH) |
| H | ⓘ Keystoneite | Mg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O |
| H | ⓘ Roscoelite | KV23+(AlSi3O10)(OH)2 |
| H | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| C | Carbon | |
| C | ⓘ Calcite | CaCO3 |
| O | Oxygen | |
| O | ⓘ Allanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| O | ⓘ Alunite | KAl3(SO4)2(OH)6 |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Quartz var. Chalcedony | SiO2 |
| O | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| O | ⓘ Ferberite | FeWO4 |
| O | ⓘ Goethite | Fe3+O(OH) |
| O | ⓘ Hübnerite | MnWO4 |
| O | ⓘ Ilmenite | Fe2+TiO3 |
| O | ⓘ Keystoneite | Mg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O |
| O | ⓘ Magnolite | [Hg2]2+[Te4+O3] |
| O | ⓘ Paratellurite | TeO2 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Roscoelite | KV23+(AlSi3O10)(OH)2 |
| O | ⓘ Tellurite | TeO2 |
| O | ⓘ Fayalite-Forsterite Series | |
| O | ⓘ Garnet Group | X3Z2(SiO4)3 |
| O | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| O | ⓘ Ilmenite var. Picrotitanite | Fe2+TiO3 |
| F | Fluorine | |
| F | ⓘ Fluorite | CaF2 |
| Mg | Magnesium | |
| Mg | ⓘ Keystoneite | Mg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O |
| Mg | ⓘ Fayalite-Forsterite Series | |
| Al | Aluminium | |
| Al | ⓘ Allanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| Al | ⓘ Alunite | KAl3(SO4)2(OH)6 |
| Al | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Al | ⓘ Roscoelite | KV23+(AlSi3O10)(OH)2 |
| Si | Silicon | |
| Si | ⓘ Allanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| Si | ⓘ Quartz var. Chalcedony | SiO2 |
| Si | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Roscoelite | KV23+(AlSi3O10)(OH)2 |
| Si | ⓘ Fayalite-Forsterite Series | |
| Si | ⓘ Garnet Group | X3Z2(SiO4)3 |
| Si | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| S | Sulfur | |
| S | ⓘ Alunite | KAl3(SO4)2(OH)6 |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Marcasite | FeS2 |
| S | ⓘ Molybdenite | MoS2 |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Pyrrhotite | Fe1-xS |
| S | ⓘ Sphalerite | ZnS |
| S | ⓘ Stibnite | Sb2S3 |
| Cl | Chlorine | |
| Cl | ⓘ Calomel | [Hg2]2+Cl2 |
| K | Potassium | |
| K | ⓘ Alunite | KAl3(SO4)2(OH)6 |
| K | ⓘ Roscoelite | KV23+(AlSi3O10)(OH)2 |
| Ca | Calcium | |
| Ca | ⓘ Allanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| Ca | ⓘ Calcite | CaCO3 |
| Ca | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Ca | ⓘ Fluorite | CaF2 |
| Ti | Titanium | |
| Ti | ⓘ Ilmenite | Fe2+TiO3 |
| Ti | ⓘ Ilmenite var. Picrotitanite | Fe2+TiO3 |
| V | Vanadium | |
| V | ⓘ Roscoelite | KV23+(AlSi3O10)(OH)2 |
| Mn | Manganese | |
| Mn | ⓘ Hübnerite | MnWO4 |
| Fe | Iron | |
| Fe | ⓘ Allanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Fe | ⓘ Ferberite | FeWO4 |
| Fe | ⓘ Goethite | Fe3+O(OH) |
| Fe | ⓘ Ilmenite | Fe2+TiO3 |
| Fe | ⓘ Keystoneite | Mg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O |
| Fe | ⓘ Marcasite | FeS2 |
| Fe | ⓘ Pyrite | FeS2 |
| Fe | ⓘ Pyrrhotite | Fe1-xS |
| Fe | ⓘ Fayalite-Forsterite Series | |
| Fe | ⓘ Ilmenite var. Picrotitanite | Fe2+TiO3 |
| Ni | Nickel | |
| Ni | ⓘ Keystoneite | Mg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O |
| Ni | ⓘ Melonite | NiTe2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Cu | ⓘ Rickardite | Cu7Te5 |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
| Mo | Molybdenum | |
| Mo | ⓘ Molybdenite | MoS2 |
| Ag | Silver | |
| Ag | ⓘ Native Silver var. Amalgam | (Ag,Hg) |
| Ag | ⓘ Empressite | AgTe |
| Ag | ⓘ Hessite | Ag2Te |
| Ag | ⓘ Iodargyrite | AgI |
| Ag | ⓘ Petzite | Ag3AuTe2 |
| Ag | ⓘ Native Silver | Ag |
| Ag | ⓘ Sylvanite | AgAuTe4 |
| Ag | ⓘ Weishanite | (Au,Ag,Hg) |
| Sb | Antimony | |
| Sb | ⓘ Stibnite | Sb2S3 |
| Te | Tellurium | |
| Te | ⓘ Altaite | PbTe |
| Te | ⓘ Calaverite | AuTe2 |
| Te | ⓘ Coloradoite | HgTe |
| Te | ⓘ Empressite | AgTe |
| Te | ⓘ Hessite | Ag2Te |
| Te | ⓘ Keystoneite | Mg0.5Ni2+Fe3+(Te4+O3)3 · 4.5H2O |
| Te | ⓘ Magnolite | [Hg2]2+[Te4+O3] |
| Te | ⓘ Melonite | NiTe2 |
| Te | ⓘ Paratellurite | TeO2 |
| Te | ⓘ Petzite | Ag3AuTe2 |
| Te | ⓘ Rickardite | Cu7Te5 |
| Te | ⓘ Sylvanite | AgAuTe4 |
| Te | ⓘ Tellurite | TeO2 |
| Te | ⓘ Native Tellurium | Te |
| I | Iodine | |
| I | ⓘ Iodargyrite | AgI |
| Ce | Cerium | |
| Ce | ⓘ Allanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| W | Tungsten | |
| W | ⓘ Ferberite | FeWO4 |
| W | ⓘ Hübnerite | MnWO4 |
| Au | Gold | |
| Au | ⓘ Calaverite | AuTe2 |
| Au | ⓘ Native Gold | Au |
| Au | ⓘ Petzite | Ag3AuTe2 |
| Au | ⓘ Sylvanite | AgAuTe4 |
| Au | ⓘ Weishanite | (Au,Ag,Hg) |
| Hg | Mercury | |
| Hg | ⓘ Native Silver var. Amalgam | (Ag,Hg) |
| Hg | ⓘ Calomel | [Hg2]2+Cl2 |
| Hg | ⓘ Coloradoite | HgTe |
| Hg | ⓘ Magnolite | [Hg2]2+[Te4+O3] |
| Hg | ⓘ Native Mercury | Hg |
| Hg | ⓘ Weishanite | (Au,Ag,Hg) |
| Pb | Lead | |
| Pb | ⓘ Altaite | PbTe |
Fossils
This region is too big or complex to display the fossil list, try looking at smaller subregions.Localities in this Region
- Colorado
- Boulder County
- Magnolia Mining District
- American Eagle - Interocean Occurrence
- Audophone Mine
- Beggar Mine
- Belmont (Graphic; Holy Cross; Tungsten King Occurrence)
- Ben C. Lowell Mine
- Black Bear Mine
- Cheyenne (Modoc; Tiger Nos. 1 & 2 Occurrence)
- Dun Raven Mine
- Eskimo Mine
- Fortune Occurrence
- Golden Glow
- Humbug Mine
- Kansas City Tunnel
- Kekionga Mine
- Keystone Mine
- Lady Franklin Mine
- Little Maud Mine
- Lord Byron
- Magnolia Mine
- Missoula
- Molly Gibson Mine
- Mountain Lion Mine - Keystone vein
- New Year Mine
- Magnolia Mining District
- Boulder County
- Colorado
- Boulder County
- Magnolia Mining District
- Pandora No. 1 & 4 Lode Claims
- Park Placer (Congo Chief; Apex; Dominion; American; Josie Mansfield Placer; Don; Rico; Deyling; Enterprise)
- Pickwick Mine
- Poorman Mine (1)
- Power Shaft Mine
- Recluse
- Rusty Dime
- Sac and Fox Mine
- Santa Lasaria (Mtn. Mexico; Bravo Occurrence)
- Senator Hill and Ophir Veins
- Snow Flake Mine
- Spring Bear Mine
- Sylvanite Tunnel
- Telephone Mine
- Unknown Gold Occurrence (MRDS - 10017293)
- Unknown Gold Occurrence (MRDS - 10017366)
- Unknown Gold Occurrence (MRDS - 10091227)
- Unknown Gold Occurrence (MRDS - 10091290)
- Unknown Gold Occurrence (MRDS - 10091486)
- Unknown Silver Occurrence (MRDS - 10017327)
- Unnamed chrysotile dike
- Valley View Mine
- Zephyr Occurrence
- Magnolia Mining District
- Boulder County
Other Regions, Features and Areas that Intersect
North AmericaContinent
- Rocky MountainsMountain Range
North America PlateTectonic Plate
- Great Plains DomainDomain
- Southern Rocky MountainsOrogenic Belt
USA
- Colorado
- Nederland Mining DistrictMining District
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References
Magnolia Mining District, Boulder County, Colorado, USA