A series of three mine openings (Big Hill, Middle Hill, Grassy Hill) located at Cornwall, near Lebanon. Started in 1732 and owned by the Cornwall Ore Banks Co. (1864) and later, the Bethlehem Steel Co. Magnetite replacement of Cambrian limestone by fluids from diabase intrusive.
References:
Rocks & Minerals: 13: 213.
Gordon, Samuel G. (1922), Mineralogy of Pennsylvania: 147.
Mineral Deposits of New Jersey & Eastern Pennsylvania; XVI International Geological Congress Guidebook 8, Excursion A-8 (1933), Berkey, C.P.; Lapham & Geyer, 1965. Mineral Collecting in Pennsylvania.
Reed, Juliet C. (1976), Annotated Biblio. of Minerals New to the PA List 1965-1974, The Mineralogical Society of Pennsylvania, Inc.: 51-52.
Tschernich, R. (1992): Zeolites of the World, 70.
Econ Geol (1985) 80:418-443
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Map Reference: 40°16'N , 76°24'W
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Mineral List:84 entries listed. 66 valid minerals. 1 erroneous literature entry.
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