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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): 42.23417,-71.47694
Köppen climate type:Dfa : Hot-summer humid continental climate

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.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

541 - 1000 Ma

ID: 2853150
Blackstone Group, Undivided

Age: Neoproterozoic (541 - 1000 Ma)

Stratigraphic Name: Blackstone Group

Description: Quartzite, schist, phyllite, marble, and metavolcanic rocks.

Comments: Part of Milford-Dedham Zone (Tertiary and Older Rocks)

Lithology: Major:{quartzite,schist,phyllite}, Minor:{marble,metavolcanic}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

This page 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.


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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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