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Twin Lead Mine, Blue Hill, Blue Hill - Castine Mining District, Hancock County, Maine, USAi
Regional Level Types
Twin Lead MineMine
Blue HillTown
Blue Hill - Castine Mining DistrictMining District
Hancock CountyCounty
MaineState
USACountry

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Latitude & Longitude (WGS84):
44° 24' 2'' North , 68° 36' 29'' West
Latitude & Longitude (decimal):
44.40075,-68.60826
GeoHash:
G#: drzhwfbvp
GRN:
N30W36
Type:
Mine
KΓΆppen climate type:
Dfb : Warm-summer humid continental climate
Nearest Settlements:
PlacePopulationDistance
Blue Hill943 (2017)2.3km
Brooksville947 (2017)8.5km
Sedgwick1,146 (2017)10.8km
Penobscot1,397 (2017)10.8km
Surry1,415 (2017)13.5km
Mindat Locality ID:
107372
Long-form identifier:
mindat:1:2:107372:3
GUID (UUID V4):
df6ec4a1-c5fb-42ef-bf8e-3c02787be85e


A Cu-Sn-Ag-Ni-As-pyrite(S) occurrence/mine located 2.3 km (1.4 miles) SW of Blue Hill (town). The USGS MRDS database stated accuracy for this locality is 1,000 meters.

Mineralization is a polymetallic deposit (Mineral occurrence model information: Model code: 91; USGS model code: 24b; Deposit model name: Massive sulfide, Besshi (Japanese deposits); Mark3 model number: 30). The lode is approximately 10 feet wide. Local rocks include Ordovician - Precambrian Z Ellsworth formation.

Regional geologic structures/rocks include quartzites, gneiss, and amphibolite.

Workings include surface and underground openings. A 1910 site investigation indicated that the lode had been worked open cast to a depth of 12 feet for approximately 70 feet along its strike; a three-compartment shaft reportedly 200 feet deep was observed to be flooded. There is a 28 foot crosscut on the 95 foot level and a S crosscut 122 feet. The ruins of a smelter as well as small slag heaps on site were also noted.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


11 valid minerals.

Detailed Mineral List:

β“˜ Arsenopyrite
Formula: FeAsS
β“˜ 'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
β“˜ Bornite
Formula: Cu5FeS4
β“˜ Cassiterite
Formula: SnO2
β“˜ Chalcopyrite
Formula: CuFeS2
β“˜ 'Chlorite Group'
β“˜ Galena
Formula: PbS
β“˜ Magnetite
Formula: Fe2+Fe3+2O4
β“˜ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
β“˜ Muscovite var. Sericite
Formula: KAl2(AlSi3O10)(OH)2
β“˜ Nickeline
Formula: NiAs
β“˜ Pyrite
Formula: FeS2
β“˜ Pyrrhotite
Formula: Fe1-xS
β“˜ Quartz
Formula: SiO2

Gallery:

CuFeS2β“˜ Chalcopyrite

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
β“˜Bornite2.BA.15Cu5FeS4
β“˜Chalcopyrite2.CB.10aCuFeS2
β“˜Nickeline2.CC.05NiAs
β“˜Pyrrhotite2.CC.10Fe1-xS
β“˜Galena2.CD.10PbS
β“˜Pyrite2.EB.05aFeS2
β“˜Arsenopyrite2.EB.20FeAsS
Group 4 - Oxides and Hydroxides
β“˜Magnetite4.BB.05Fe2+Fe3+2O4
β“˜Quartz4.DA.05SiO2
β“˜Cassiterite4.DB.05SnO2
Group 9 - Silicates
β“˜Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
β“˜var. Sericite9.EC.15KAl2(AlSi3O10)(OH)2
Unclassified
β“˜'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
β“˜'Chlorite Group'-

List of minerals for each chemical element

HHydrogen
Hβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Hβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Hβ“˜ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
OOxygen
Oβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Oβ“˜ CassiteriteSnO2
Oβ“˜ MagnetiteFe2+Fe23+O4
Oβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Oβ“˜ QuartzSiO2
Oβ“˜ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
FFluorine
Fβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
MgMagnesium
Mgβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
AlAluminium
Alβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Alβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Alβ“˜ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
SiSilicon
Siβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Siβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Siβ“˜ QuartzSiO2
Siβ“˜ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
SSulfur
Sβ“˜ ArsenopyriteFeAsS
Sβ“˜ BorniteCu5FeS4
Sβ“˜ ChalcopyriteCuFeS2
Sβ“˜ GalenaPbS
Sβ“˜ PyriteFeS2
Sβ“˜ PyrrhotiteFe1-xS
KPotassium
Kβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Kβ“˜ MuscoviteKAl2(AlSi3O10)(OH)2
Kβ“˜ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
TiTitanium
Tiβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
FeIron
Feβ“˜ ArsenopyriteFeAsS
Feβ“˜ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Feβ“˜ BorniteCu5FeS4
Feβ“˜ ChalcopyriteCuFeS2
Feβ“˜ MagnetiteFe2+Fe23+O4
Feβ“˜ PyriteFeS2
Feβ“˜ PyrrhotiteFe1-xS
NiNickel
Niβ“˜ NickelineNiAs
CuCopper
Cuβ“˜ BorniteCu5FeS4
Cuβ“˜ ChalcopyriteCuFeS2
AsArsenic
Asβ“˜ ArsenopyriteFeAsS
Asβ“˜ NickelineNiAs
SnTin
Snβ“˜ CassiteriteSnO2
PbLead
Pbβ“˜ GalenaPbS

Other Databases

Link to USGS MRDS:10121792

Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Emmons, William H. (1910) Some ore deposits in Maine and the Milan mine, New Hampshire. Bulletin Vol. 432. US Geological Survey doi:10.3133/b432 pp.31-32
Hussey II, Arthur M. [compiler] (1958), Maine Metal Mines And Prospects, Maine Geological Survey Mineral Resources Index Series No. 3: 29 (June 1, 1958).
Young, R. S. (1962), Prospect Evaluations, Hancock County, Maine: Maine Geological Survey Special Economic Studies Series 2, 113 pages
U.S. Bureau of Mines (1995), Minerals Availability System/Mineral Industry Location System (MAS/MILS), U.S. Bureau of Mines, file ID #0230090078.
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
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