A series of three mine openings (Big Hill, Middle Hill, Grassy Hill) located at Cornwall, near Lebanon. Started in the 1700's and owned by the Cornwall Ore Banks Co. (1864) and later, the Bethlehem Steel Co. Magnetite replacement of Cambrian limestone.
Ref.:
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.
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Map Reference: 40°16'N , 76°24'W
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