Swathmore tunnel, Eldora, Caribou Mining District, Boulder County, Colorado, USAi
| Regional Level Types | |
|---|---|
| Swathmore tunnel | Mine |
| Eldora | Town |
| Caribou Mining District | Mining District |
| Boulder County | County |
| Colorado | State |
| USA | Country |
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Latitude & Longitude (WGS84):
39° 56' 52'' North , 105° 34' 28'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Eldora | 142 (2011) | 0.9km |
| Nederland | 1,520 (2017) | 5.6km |
| Rollinsville | 181 (2011) | 7.1km |
| Bonanza Mountain Estates | 128 (2011) | 8.6km |
| Saint Anton Highlands | 288 (2016) | 11.0km |
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 |
|---|---|---|
| Flatirons Mineral Club | Boulder, Colorado | 27km |
| Mile High Rock and Mineral Society | Arvada, Colorado | 45km |
An Au-Te-Mo occurrence/mine. This locality is not listed in the USGS MRDS database.
The Swathmore shaft, near the station at Eldora and close to the mouth of the Mogul tunnel, was idle at the time of this survey and could not be entered. The only ore seen on the dump showed either fine-grained pyrite in a quartz gangue or specularite and cherty-looking silica presumably derived from the pyrite and quartz through surficial alteration.
Admittance to the Swathmore tunnel, located a short distance above the village of Eldora was denied. Three other veins carrying ore similar to that of the Enterprise are said to have been cut by this tunnel before the Enterprise vein was reached. Ore seen in the bins is an association of cherty silica, fine-grained pyrite, and a greenish mineral that is probably roscoelite. The tellurides are said to be carried in narrow seams (those seen measured one sixteenth to one-eighth inch) of dark-gray quartz that traverse the greenish aggregate. Upon exposure the ore becomes coated with a blue film of oxides of molybdenum formed from the molybdenite in the ore.
Admittance to the Swathmore tunnel, located a short distance above the village of Eldora was denied. Three other veins carrying ore similar to that of the Enterprise are said to have been cut by this tunnel before the Enterprise vein was reached. Ore seen in the bins is an association of cherty silica, fine-grained pyrite, and a greenish mineral that is probably roscoelite. The tellurides are said to be carried in narrow seams (those seen measured one sixteenth to one-eighth inch) of dark-gray quartz that traverse the greenish aggregate. Upon exposure the ore becomes coated with a blue film of oxides of molybdenum formed from the molybdenite in the ore.
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
3 valid minerals.
Detailed Mineral List:
| ⓘ Pyrite Formula: FeS2 References: |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Roscoelite Formula: KV3+2(AlSi3O10)(OH)2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 9 - Silicates | |||
| ⓘ | Roscoelite | 9.EC.15 | KV3+2(AlSi3O10)(OH)2 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Roscoelite | KV23+(AlSi3O10)(OH)2 |
| O | Oxygen | |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Roscoelite | KV23+(AlSi3O10)(OH)2 |
| Al | Aluminium | |
| Al | ⓘ Roscoelite | KV23+(AlSi3O10)(OH)2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Roscoelite | KV23+(AlSi3O10)(OH)2 |
| S | Sulfur | |
| S | ⓘ Pyrite | FeS2 |
| K | Potassium | |
| K | ⓘ Roscoelite | KV23+(AlSi3O10)(OH)2 |
| V | Vanadium | |
| V | ⓘ Roscoelite | KV23+(AlSi3O10)(OH)2 |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Rocky MountainsMountain Range
North America PlateTectonic Plate
- Great Plains DomainDomain
- Southern Rocky MountainsOrogenic Belt
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