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White Mountain Mine, Thornton, Grafton County, New Hampshire, USAi
| Regional Level Types | |
|---|---|
| White Mountain Mine | Mine |
| Thornton | Township |
| Grafton County | County |
| New Hampshire | State |
| USA | Country |
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Latitude & Longitude (WGS84):
43° 53' 31'' North , 71° 37' 57'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Thornton | 1,963 (2017) | 3.5km |
| Woodstock | 1,213 (2017) | 10.4km |
| Waterville Valley | 274 (2017) | 12.5km |
| Plymouth | 4,456 (2017) | 15.7km |
| North Woodstock | 528 (2017) | 15.9km |
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 |
|---|---|---|
| Saco Valley Gem and Mineral Club | Conway, New Hampshire | 42km |
Other/historical names associated with this locality:
White Mountain Mica Company Mine; Thornton Hill Mine
The White Mountain Mica Mining Co. of Campton opened the mine in August under lease and operated it until December 1942. Two opencuts were made: a west cut about 65 feet long, 5 to 50 feet wide, and 15 feet deep; and an east cut about 80 feet long, 20 feet wide and 10 feet deep. The deposit was mapped in 1942 by H. M. Bannerman and D. M. Larrabee, and the later mine development was mapped by A. H. McNair, G. B. Burnett, and J. B. Headley, Jr., in September 1942. It was restudied in April 1943 by D. M. Larrabee.
Three pegmatites outcrop on the property. The north pegmatite, in which the cuts were made, is exposed along strike for 180 feet, has a maximum width of 110 feet, and is lenticular in plan. Its north contact dips 60° S., but the south contact has a vertical or high northward dip, hence the body appears to be broadly lenticular in cross section. The south pegmatite, ex .. posed along the north flank of the low hill, is approximately 120 feet long and 3 to 7 feet thick. It strikes east and dips 40° N., and probably is connected with the north body underground. The east pegmatite extends eastward 250 feet. It is 5 to 45 feet wide and its walls have southward dips of 60°-75°.
Three pegmatites outcrop on the property. The north pegmatite, in which the cuts were made, is exposed along strike for 180 feet, has a maximum width of 110 feet, and is lenticular in plan. Its north contact dips 60° S., but the south contact has a vertical or high northward dip, hence the body appears to be broadly lenticular in cross section. The south pegmatite, ex .. posed along the north flank of the low hill, is approximately 120 feet long and 3 to 7 feet thick. It strikes east and dips 40° N., and probably is connected with the north body underground. The east pegmatite extends eastward 250 feet. It is 5 to 45 feet wide and its walls have southward dips of 60°-75°.
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
5 valid minerals.
Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
| ⓘ Albite Formula: Na(AlSi3O8) References: |
| ⓘ Albite var. Oligoclase Formula: (Na,Ca)[Al(Si,Al)Si2O8] References: |
| ⓘ 'Feldspar Group' |
| ⓘ 'Feldspar Group var. Perthite' |
| ⓘ Muscovite Formula: KAl2(AlSi3O10)(OH)2 References: |
| ⓘ Pyrite Formula: FeS2 References: |
| ⓘ Pyrrhotite Formula: Fe1-xS References: |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Pyrrhotite | 2.CC.10 | Fe1-xS |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 9 - Silicates | |||
| ⓘ | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | Albite | 9.FA.35 | Na(AlSi3O8) |
| ⓘ | var. Oligoclase | 9.FA.35 | (Na,Ca)[Al(Si,Al)Si2O8] |
| Unclassified | |||
| ⓘ | 'Feldspar Group' | - | |
| ⓘ | 'var. Perthite' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| O | Oxygen | |
| O | ⓘ Albite | Na(AlSi3O8) |
| O | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Albite var. Oligoclase | (Na,Ca)[Al(Si,Al)Si2O8] |
| O | ⓘ Quartz | SiO2 |
| Na | Sodium | |
| Na | ⓘ Albite | Na(AlSi3O8) |
| Na | ⓘ Albite var. Oligoclase | (Na,Ca)[Al(Si,Al)Si2O8] |
| Al | Aluminium | |
| Al | ⓘ Albite | Na(AlSi3O8) |
| Al | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Al | ⓘ Albite var. Oligoclase | (Na,Ca)[Al(Si,Al)Si2O8] |
| Si | Silicon | |
| Si | ⓘ Albite | Na(AlSi3O8) |
| Si | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘ Albite var. Oligoclase | (Na,Ca)[Al(Si,Al)Si2O8] |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Pyrrhotite | Fe1-xS |
| K | Potassium | |
| K | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Ca | Calcium | |
| Ca | ⓘ Albite var. Oligoclase | (Na,Ca)[Al(Si,Al)Si2O8] |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
| Fe | ⓘ Pyrrhotite | Fe1-xS |
Other Databases
| Link to USGS MRDS: | 10150045 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Ganderia DomainDomain
- GranderiaPassive Margin
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White Mountain Mine, Thornton, Grafton County, New Hampshire, USA