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Grace Mine, Morgantown, Berks Co., Pennsylvania, USA

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Bethlehem Steel's Grace Mine exploited magnetite ore with an iron content of approximately 40 percent. The magnetite mineralization replaced a large wedge of impure Cambrian limestone already altered to calcium and magnesian silicates by contact metamorphism from a thick, subjacent intrusive sheet of diabase (Sims, 1968, p. 122–123). The deposit was the first instance of an ore discovery resulting from an airborne magnetometer survey. The Grace mine anomaly was identified in 1948, core drilling began in September of 1949 and on December 19, 1949, iron ore was hit at a depth of 1,524 feet. Work started in 1951 with the sinking of "A" shaft to a depth of 2,208 feet, used for hoisting ore and transporting materials. "A" shaft was eventually sunk to depth of "B" shaft, at 3,079 feet, which was used for men and materials.

The Grace Mine closed operations in 1977 due in part to depressed iron/steel prices and the high cost of underground ore extraction. The dumps were later used in road/ramp highway construction. Final reclamation of the property by Morgantowwn Properties began sometime after 2004, for an extensive housing development project.

The project "Bryn Eyre" is a housing project in which an entire town, 12,393 residential homes, commercial, school and public areas will be built on site. Projected to be constructed over a 20-25 year period, it is the largest such project in Pennsylvania since the 1950's. (Ref. R. Robinson, Lanc. New Era, 2007)

Ground breaking began April 1, 2007 (observations: Ms Sophia Shultz).

As of November of 2011, the site has been fenced and tailings crushed and hauled away. Police monitor the property. A sad end to yet another good collecting spot. (David S. Bernstein).

Mineral List


26 valid minerals.

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

Sims, Samuel J. (1968), "The Grace Mine Magnetite Deposit, Berks Co., Pennsylvania" in Ridge, John D. ed., Ore Deposits of the US 1933-1967: Volume I: 115.

Reed, Juliet C. (1976), Annotated Bibliography of Minerals New to the Pennsylvania List 1965-1974, The Mineralogical Society of Pennsylvania, Inc.: 54.

Economic Geology (1985): 80: 418-443.

Anthony, Bideaux, Bladh, Nichols (1990), "Handbook of Mineralogy," Volume 1.

Wharton, Heyward M. (2003) The 1949 discovery of the Grace mine iron deposit, Pennsylvania Geology: 33(1): 2.

Mineral and/or Locality  
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