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Aggregate Industries Quarry (Bayer-Mingolla Quarry; Trimount Quarry), Ashland, Middlesex Co., Massachusetts, USA

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Latitude & Longitude (WGS84): 42° 14' 3'' North , 71° 28' 37'' West
Latitude & Longitude (decimal): 42.2341666667, -71.4769444444

A crushed stone quarry on Zachary Hill, opened in 1948 by Bayer and Mingolla Industries. Rocks in the quarry are primarily amphibolite, hornblende schist and quartz-biotite schist. (Cahoon, 1985)

Mineral List

36 valid minerals.

The above list contains all mineral locality references listed on 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 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.


Biggart, Norman (1974). Ashland B & M Quarry. Souvenir Guide to New England Mineral Collecting (Annual Greater Boston Gem and Mineral Show program, pp. 41-43).

Cahoon, James C. (1985). Massachusetts: A Classic Swiss Alpine Cleft Mineral Region (Boston Mineralogical Symposium program book, May 1985)

Médard, Etienne; Cristofono, Peter; and Henderson, William A. (2007) Kamphaugite-(Y) from Ashland, MA (Micromounters of New England Newsletter 284:2-5)

External Links - "Kamphaugite-(Y) from Ashland, MA" - Kamphaugite-(Y) R080085

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