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Line Pit

Minor podiform chromite deposit, 1 of 1 in Cecil county (in Maryland)

Sections of this page: [Geologic] - [Economic] - [Reference]

Geologic Information
Other namesLowe's mine
CountryUnited States
State or provincePennsylvania
Geographic location:39°43'16"N, 76°10'13"W
(-76.170278, 39.721111)
Geographic context: (click for info)
Deposit typeminor podiform chromite
Model typeBanded Podiform
Deposit formirregular pipelike body, stringers
Deposit texturecoarse massive, spotted
Ore typeMetallurgical
Age of depositLower Ordovician (490±20 Ma)
Age (m.y.)490million years
Area of deposit317.2sq m
Ore body length52m
Ore body width6.1m
Mineralogychromite
maucherite
millerite
hematite
brucite
magnesite
hydromagnesite
clinochlore
penninite
kammererite
chrysotile
talc
deweylite
sepiolite
antigorite
williamsite
Host rock typeserpentine
Host rock length41800
Host rock width2400
Paleotectonic settingsuprasubduction
Ophiolite zonecumulate
Deposits < 10kmpodiform chromite, placer chromite
Rocks within 5kmserpentine
dunite
wehrlite
websterite
pyroxenite
gabbro
granite
granodiorite gneiss
mica schist
chlorite schist
quartzite
Geologic map unit-76.1702777777778, 39.7211111111111
Nearby scientific dataFind additional scientific data near this location
Economic Information
Discovery date<1838
Startup date<1838
Tonnage0.007million metric tons
Mine depth73m
Ore depth0m
Cr2O3 grade50percent
Cr %35.1percent
Fe %12percent
Cr:Fe ratio2.9
Al2O3 %11percent
Si2O2 %4.4percent
Reference information
CommentsClosed in 1919. Disseminated ore averaged 30% Cr2O3. Deposit extended into Lancaster County, PA from Cecil County, MD. Due to flooding, some ore remains at depth, probably about 30 t per m depth based on the size of the deposit being mined at the bottom of the shaft.
References
Gordon, S.G., 1922, The chromite deposits of the State Line serpentines: The Academy of Natural Sciences of Philadelphia Proceedings, v. 73, 1921, p. 449-454.
Glenn, W., 1896, Chrome in the southern Appalachian region: New York, American Institute of Mining Engineers Transactions v. 25, p. 481-499.
Laurent, R., and Kacira, N., 1987, Chromite deposits in the Appalachian ophiolites, in Stowe, C.W., ed., Evolution of chromium ore fields: New York, Van Nostrand Reinhold Company, p. 169-193.
Pearre, N., and Heyl, A., 1959, The history of chromite mining in Pennsylvania and Maryland: Pennsylvania Geological Survey Information Circular 14, 23 p.
Gater, A.E., 1991, Shear zone control on mineral deposits in the State-line serpentinite, Pennsylvania Piedmont: Ore Geology Reviews, v. 6, p. 171-184.
Knopf, E.B., 1922, Chrome ores of southeastern Pennsylvania and Maryland, in Ransome, F.L., and Burchard, E.F., eds., Contributions to economic geology, Part 1.--Metals and nonmetals except fuels: U.S. Geological Survey Bulletin 725, p. 85-99.
Pearre, N.C., and Heyl, A.V., Jr., 1960, Chromite and other mineral deposits in serpentine rocks of the Piedmont Upland, Maryland, Pennsylvania, and Delaware: U.S. Geological Survey Bulletin 1082-K, p. 707-833.
Wylie, A.G., and Candela, P.A., 1999, Metallic mineral deposits--Chromite (Chapter 40E), in Shultz, C.H., ed., The geology of Pennsylvania: Pennsylvania Geological Survey Special Publication 1: Pennsylvania Geological Survey and Pittsburgh Geological Society, p. 589-595.
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