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Brookdale Mine, Phoenixville mining District, Schuylkill Township, Chester Co., Pennsylvania, USA

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Latitude & Longitude (WGS84): 40° 6' 4'' North , 75° 31' 15'' West
Latitude & Longitude (decimal): 40.10111,-75.52083
Köppen climate type:Cfa : Humid subtropical climate

Ref.: Rocks & Min.:9:21; 22:309; Dana 6:772,1068; Min. Rec.:20(5)369-384. A lead mine and one of the "Wheatley mines." located near Charlestown, which, in turn, is located near Phoenixville. The workings are on the Wheatley lode and consist of 3 shafts, 839 meters of workings on 3 levels and an engine shaft 59 meters deep. Started Oct, 1852 and ceased operations about 1865. Mine was owned by Charles Wheatley, then the New York & Boston Silver-Lead Co. According to Gordon, the Brookdale Mine was about 1/2 mile southwest of the Wheatley Mine.

Mineral List

22 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 - 4000 Ma

ID: 2951675
Felsic and intermediate gneiss

Age: Precambrian (541 - 4000 Ma)

Description: Medium grained, light pink to greenish gray; largely quartz, feldspar, and mica; commonly gneissic, containing alteration minerals; interfingers with gabbroic gneiss.

Comments: Digital map differences from 1980 printed map: name changed from (Granodiorite and granodiorite gneiss).

Lithology: Major:{muscovite gneiss}

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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