An emery mine opened & closed before 1933. Located at Dutch Street near Montrose, 2 miles South of Peekskill (which actually puts it in Cortlandt Township, although the local emery mines have historically been attributed to Peekskill, since that was the closest urban center).
References:
Rocks & Minerals (1933): 8: 39.
Manchester, J.G. (1931) The Minerals of New York City & Its Environs, New York Mineralogical Club Bulletin, Vol. 3, No. 1, 70-72.
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Map Reference: 41°15'14"N , 73°55'18"W
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Mineral List:21 entries listed. 11 valid minerals.
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