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Tilly Foster Iron Mine, Brewster, Town of Southeast, Putnam Co., New York, USA
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Latitude: 41°24'59"N
Longitude: 73°38'59"W
 
 
Large iron ore (magnetite) deposit discovered in 1810. Although the mine is a few miles from Brewster, it is actually in the now defunct hamlet of Tilly Foster, now partly submerged by the Middle Branch Reservoir. The official incorporated name was Tilly Foster Iron Mine. The mine was 600 feet deep in 1879. Mining ceased in 1897, after 13 miners were killed in a rockslide. The articles by Nightingale (2001) provide a historical summary and mineral details, which have been incorporated into the species info pages of this site.

It is famous for its excellent brucite, chondrodite, clinochlore, titanite, and magnetite crystals and antigorite or lizardite (and other species) pseudomorphs after a wide variety of minerals. Dana (1874), Trainer (various), and Nightingale (2001) provide details. This list below is modified from Januzzi (1976):

antigorite or lizardite after amphiboles, anhydrite, anthophyllite, fluorapatite, biotite, brucite, calcite, chondrodite, olivine, chrysotile, clinochlore, dolomite, enstatite, fluorite, magnetite, muscovite, pectolite, clinoclore, pyrrhotite, scapolite, talc
brucite after dolomite
calcite after chrysotile
dolomite after chondrodite
limonite after biotite
magnetite after chondrodite
magnetite after dolomite
pyrite after pyrrhotite
pyrrhotite after serpentine
talc after amphibole, enstatite



Mineral List

Actinolite
Albite
var: Oligoclase
Allanite-(Ce)
Almandine
Amphibole Supergroup
var: Byssolite

Anhydrite
Ankerite
Antigorite
'Apophyllite'
Aragonite
Arsenopyrite
Augite
Autunite
Axinite-(Fe)
Baryte
'Biotite'
Bornite
Brochantite
Brucite
var: Nemalite
Calcite
Cerussite
'Chabazite'
Chalcopyrite
Chondrodite
Chrysocolla
'Chrysolite'
Chrysotile
Clinochlore
Clinochlore
var: Leuchtenbergite

Clinohumite
Clinozoisite
Danburite
Datolite
Diopside
var: Diallage
Dolomite
Dravite
Enstatite
Epidote
Erythrite
Ferro-actinolite
Fluorapatite
Fluorite
Galena
Goethite
Gold ?
Graphite
Grossular
Gypsum
Hedenbergite
Hematite
'Heulandite'
Hexahydrite
Hisingerite ?
'Hornblende'
Humite
Hydromagnesite ?
Hydrotalcite
Ilmenite
Ilvaite
Jarosite
Kaolinite
Laumontite
Lepidocrocite ?
'Limonite'
Linarite
Linnaeite
Lizardite
Magnesite
Magnetite
Malachite
Marcasite
Marialite
Melanterite
Microcline
Molybdenite
Muscovite
Natrolite
'Olivine'
Opal
Palygorskite
Pargasite
Pectolite
Phlogopite
Posnjakite
Prehnite
'Prochlorite'
'Psilomelane' ?
Pyrite
'Pyroxene Group'
Pyrrhotite
Quartz
var: Rose Quartz
var: Smoky Quartz
Riebeckite
Riebeckite Root Name
var: Crocidolite

Rutile
Scheelite
'Serpentine Group
var: Marmolite'

Serpierite ?
Siderite
Sphalerite
Spinel
'Stilbite'
Sulphur
Szomolnokite ?
Talc
var: Steatite
Thomsonite-Ca
Thorite ?
Titanite
'Tourmaline'
Tremolite
Vermiculite
Zircon


117 entries listed. 92 valid minerals. 2 erroneous literature entries.

The above list 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

Mather, W. W. (1839), Third Annual Report on the Geology of the First Geological District of the State of New York. Albany, New York.

Rogers, H. D. (1840), Final report on the geology of the State of New Jersey. 12-43.

Beck, L. C. (1842), Mineralogy of New York. W. and A. White and J. Visscher, Albany, New York.

Mather, W. W. (1843), Geology of New York, Part I, Comprising Geology of the First Geological District. Albany, New York.

Cook, G. H. (1868), The Geology of New Jersey. Newark, New Jersey.

Breidenbaugh, E. S. (1873), On the minerals found at the Tilly Foster iron mines, N.Y. American Journal of Science: third series: 6: 207-213.

Dana, James D. (1874), On serpentine pseudo-morphs and other kinds from the Tilly Foster iron mine, Putnam County, New York. American Journal of Science, third series: 8: 371-381, 447-459.

Dana, Edward S. (1875), Preliminary notice of chondrodite crystals from the Tilly Foster mine, Brewster, New York. American Journal of Science, third series: 9: 63-64.

Dana, Edward S. (1875b), On the chondrodite from the Tilly Foster mine, Brewster, New York. American Journal of Science, third series: 10: 89-103.

Merrill, F.J.H. and Britton, N.L. (1883), Annual Report of the State Geologist for 1883. 27-77.

Merrill, F.J.H. and Britton, N.L. (1885), Annual Report of the State Geologist for 1885. 36-55.

Wendt, A. F. (1885), The iron mines of Putnam County, N. Y. Transactions of the American Institute of Mining Engineers: 13: 478- 488.

Pelletreau, William (1886), History of Putnam County, New York. W.W. Preston, Philadelphia.

Putnam, B.T. (1886), Report on the mining industries of the United States. Tenth Census, 1880.

Ruttmann, F. S. (1887), Notes on the geology of the Tilly Foster ore-body, Putnam County, New York. Transactions of the American Institute of Mining Engineers: 15: 79- 90

McDowell, F. H. (1889), The reopening of the Tilly Foster iron-mine. Transactions of the American Institute of Mining Engineers: 17: 758-767.

Landis, E. K. (1900), The Tilly Foster mine. The Journal of the Franklin Institute: 150: 223-226.

Whitlock, H. P. (1903), List of New York mineral localities. Bulletin of the New York State Museum: 70: 70-71.

Stewart, A. C. (1908), The magnetite belts of Putnam County, N. Y. The School of Mines Quarterly: 29: 283-294.

Koeberlin, F. R. (1909), The Brewster iron bearing district of New York. Economic Geology: 4: 713-54.

Colony, R. J. (1921), The magnetite iron deposits of southeastern New York. New York State Museum Bulletin: 249-250.

Manchester, J. G. (1931), The Minerals of New York City and its Environs. New York Mineralogical Club, Bulletin: 3(1), New York, NY, 165 p., 127 plates.

Doherty, E. (1934), Report on the Rocks and Minerals Association Second National Outing. Rocks and Minerals: 9(7): 105.

Zodac, Peter. (1934), Club and society notes. Rocks and Minerals: 9(6): 91.

Elwell, Wilbur. (1936), Mineral collecting by hydroplane. Rocks and Minerals: 11(6): 92 -93.

Trainer, John N. (1938), Tilly Foster up-to-date. Rocks and Minerals: 13(10): 291-303.

Zodac, Peter. (1938), Some recent finds at Tilly Foster. Rocks and Minerals: 13(6): 180-181.

Trainer, John N. (1939), Tilly Foster up-to-date. Rocks and Minerals: 14(2): 50-52.

Trainer, John N. (1940), Another year at Tilly Foster. Rocks and Minerals: 15(4): 126–128.

Trainer, John N. (1941), The fifth year at Tilly Foster. Rocks and Minerals: 16(4): 122-126.

Rosch, J. (1942), A Tilly Foster incident. Rocks and Minerals: 17(1): 16-17.

Trainer, John N. (1942), Sixth year at Tilly Foster. Rocks and Minerals: 17(1): 8-9.

Trainer, John N. (1943), More about Tilly Foster. Rocks and Minerals: 18(6): 168-169.

Prucha, John J. (1956), Geology of the Brewster magnetite district of southeastern New York. New York State Museum and Science Service Circular 43.

Bourne, W. (1957), Trip to Tilly Foster, New York. Rocks and Minerals: 32(5-6): 258-260.

Januzzi, Ronald E. (1966), A Field Mineralogy of the Tilly Foster Iron Mine. Mineralogical Press, Danbury, Connecticut.

Sinkankas, John. (1966), Gemstones of North America, Van Nostrand, Princeton, N.J. 675 p.

Frondel, Clifford. (1970), letter to Ronald Januzzi dated January 2 1970, in reference to loss of access to the Tilly Foster mine site.

Nuwer, Henry (1971), The Tilly Foster mine. Rocks and Minerals: 46(3):147-154.

Januzzi, Ronald E. (1976), The Mineral Localities of Connecticut and Southeastern New York State. Mineralogical Press, Danbury, Connecticut.

Januzzi, Ronald E. (1989), Tilly Foster Mineral Chart. Mineralogical Press, Danbury, Connecticut.

Roe, A. (1990), Washington A. Roebling—his life and mineral collection. Mineralogical Record: 21(1): 13-30.

Isachsen, Y. W., Landing, E., Lauber, J. M., Rickard, L. V., and Rogers, W. B., editors. (1991). Geology of New York - A Simplified Account. Educational Leaflet No. 28, Albany, New York.

Tschernich, Rudy. (1992), Zeolites of the World. Geoscience Press, Phoenix, 116.

Januzzi, Ronald E. (1994), Mineral Data Book - Western Connecticut and Environs. Mineralogical Press, Danbury, Connecticut.

Lininger, Jay. (1997), Iron smelting in the Hudson Highlands: a retrospective of the Greenwood Ironworks. Matrix: 5(4): 146-151

Nightingale, Stephen L. (2001a), Mineral Species Reported to Occur at the Tilly Foster Iron Mine. Matrix: 9(2): 73-77.

Nightingale, Stephen L. (2001b), Tilly Foster Pseudomorphs. Matrix: 9(2): 78-79.

Nightingale, Stephen L. (2001c), The Tilly Foster Iron Mine: Southeast, Putnam County, New York. Matrix: 9(2): 51-72.

Smock, J. C. Iron mines and iron-ore districts in the State of New York. Bulletin of the New York State Museum of Natural History: 7: 2223.

External Links

The New York State Museum www.nysam.org/foster/

19th century American Journal of Science search page: http://diva.library.cmu.edu/ajs/search.jsp

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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