Maine's Mineral Resources

Google Earth Interactive Maps

The Maine Geological Survey is now offering selected mineral resources data to the public via Google Earth.  You will need to install Google Earth on your computer to view this data.  For help using Google Earth go to the Google Earth Help Center.

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Maine's Mineral Resources - KML file which opens Google Earth

Description of Data Views

  • Significant mineral commodities - Mining in Maine has a long history unknown to many citizens. Some of us have seen the granite quarries which remain from an industry established more than 150 years ago. Gravel pits are a common sight today, and many people are familiar with Maine's limestone, slate, and crushed stone operations. However, the well-known resources of modern times are but a few of the mineral products that have been produced in Maine. This view gives a general overview of the mineral commodities important to Maine's economic history.

  • Significant metal deposits - Prospectors have searched for metals in Maine since the 1800's. During a flurry of excitement in the early 1880's, metal deposits were mined along the coastal volcanic belt from Blue Hill to Lubec. Extensive manganese deposits were delineated during World War II. More intensive exploration from the mid-1970's to early 1990's produced several important discoveries. This view locates nine of the largest known metal deposits in the state.

  • Selected historical mines - Mining and quarrying have been an integral part of Maine's economy since the 1800's. Over time, changing economic conditions created boom and bust cycles in the demand for different commodities. Witness the Maine granite industry which reached its high point in 1901, with 152 quarries employing at least 3,500 men. However, the development of Portland cement as a building material in the early 1900's, and the depression of the 1930's, dealt Maine's granite industry a blow from which it would never recover. The mines and quarries in this view were selected to give an overview of the activities that were important in Maine's history of mineral production.
    • Metal mines
    • Pegmatite quarries
    • Stone quarries

  • Maine Mineral Resources Data System - This database was produced by the Maine Geological Survey in 2009. It was derived from the U.S. Geological Survey's Mineral Resources Data System (MRDS). MRDS is a worldwide database of mineral site records with related geologic, commodity, and deposit information. The USGS data were combined with records from the Maine Geological Survey's "Maine Metallic Mineral Deposits Database" and "Maine Mineral Localities Index." For details about the data sources, refer to the metadata and database field descriptions.

    • About the data
    • Maine MRDS data views
      • Complete listing of Maine mineral resources sites - This view includes all 1083 mineral sites listed in the database. Sites are divided into three categories: metals, minerals, and stone. Each category is shown in a different color. Pop-up windows show the site name, location accuracy, town, county, reported commodities, and references.

      • Specific Commodities - Commodity-specific views enable the user to view the geographic distribution of specific commodities or commodity groups. Due to static nature of the presentation, it should be noted that there will most likely be overlap between the views. For example, if you choose all the commodity categores and happen to select the Douglass Mine in Blue Hill, you will see multiple links to the same record since there are separate views for the commodites listed: copper, gold, lead, and silver. Opening views for fewer commodities at a time will lessen this distraction.
        • Ferrous Metals - chromium, cobalt, iron, manganese, tungsten
        • Base Metals - copper, lead, molybdenum, nickel, tin, zinc
        • Precious Metals - gold, platinum, silver
        • Light Metals - aluminum, beryllium, lithium, titanium
        • Other Metals - antimony, arsenic, bismuth, cesium, iridium, niobium, rhenium, rubidium, sodium, tantalum, tellurium, thorium, uranium, zirconium
        • Minerals - boron-borates, calcium, clay, corundum, emery, feldspar, fluorite, garnet, gemstone, graphite, kyanite, magnesite, mica, perlite, phosphorus-phosphates, quartz, silica, sulfur
        • Stone - crushed stone, dimension stone, granite, limestone, slate

    • Download the data - Maine MRDS data is available in the formats listed below. The data downloads contain the full records listed in the database, whereas the record information shown using Google Earth is a synopsis.


If you would like to comment on the use of Google Earth, provide suggestions for improving the functionality or report problems please contact the Maine Geological Survey. Geologists or others who have the opportunity to use this database should note any discrepancies or necessary changes.


  • The Maine Geological Survey is only providing the data to be used in the Google Earth application on the user's computer.  We are not responsible for installing or maintaining these software products.
  • The Google Earth imagery dates provided do not necessarily represent the date the image was captured but show the date the imagery was processed and deployed.
  • The data presented using Google Earth is for visual representation only and does not contain all data that is available by downloading the full Maine MRDS table.

Last updated on August 27, 2012