| Site identification |
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| | OBJECTID | Unique Maine MRDS record number. |
| | RECORD_SOURCE | Source of data record - either U.S. Geological Survey MRDS record, Maine Geological Survey Maine Metallic Mineral Deposits Database, or combination of both. |
| | RECORD_COMMENT | Comment describing source of combined records. |
| | DEP_ID | A unique 12-digit system generated sequence number which references records of information pertaining to a mineral property |
| | MRDS_ID | Identification number used to refer to this entry in the Mineral Resources Data System, if the record appeared in that database. |
| | MAS_ID | Identification number for this site as it appeared in the Mineral Availability System/Mineral Industry Locator System database. |
| | RECNO | A unique code which references records of the Maine Metallic Mineral Deposits Database. |
| | NAME | Current name of the site, deposit, or operation to which the record refers. |
| | SYNONYM | Alternative names of the site, deposit, or operation to which the record refers. |
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| Geographic location |
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| | TOWN | Name of the town in which the site is located |
| | COUNTY | Name of the county in which the site is located |
| | QUAD_7_5 | Name of the 7.5-minute USGS quadrangle in which the site is located |
| | LOCAT_SOURCE | Source of the location coordinates: (1) U.S. Geological Survey MRDS; (2) Maine Geological Survey - Maine Metallic Mineral Deposits Database; (3) Thompson, W. B., Wintringham, N. A., and King, V. T., 2000, Maine mineral locality index, in King, V. T. (editor), Mineralogy of Maine; Vol. 2: Mining history, gems, and geology: Maine Geological Survey, p. 355-426. |
| | LOCAT_COMM | Comment indicating how location was corrected. |
| | LOCAT_ACC | Accuracy of the location in meters where known. |
| | WGS84_LAT | Geographic latitude of the site (WGS84 datum) |
| | WGS84_LONG | Geographic longitude of the site (WGS84 datum) |
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| Commodities |
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| | COM_TYPE | Type of commodities present: metallic (M), non-metallic (N), or both (B) |
| | COM_ALPHA | Alphabetical list of commodities present. |
| | COM_MAJOR | Major commodities present, a comma-separated list. |
| | COM_MINOR | Minor commodities present, a comma-separated list. |
| | COM_TRACE | Trace commodities present, a comma-separated list. |
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| Site characteristics |
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| | DEV_STAT | Status of development of the resource or operation. |
| | OPER_TYPE | Type of operation existing or proposed at the site. |
| | WORK_TYPE | General type of workings at the site. |
| | PROD_SIZE | A broad characterization of the magnitude of production at the site. |
| | ORE_MAT | Name of the ore mineral or material found in this deposit. |
| | HOST_ROCK | Controlled term(s) indicating the type of host rocks, taken from Lithclass 6.2 |
| | DEP_TYPE_USGS | General type of deposit or resource present at the site. |
| | MODEL | Mineral deposit models that characterize the site. |
| | REPORTER | Names of the persons primarily responsible for entering information about the site. |
| | REFERENCE | Bibliographic references providing information supporting the database record. |
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| Site characteristics - Maine Metallic Mineral Deposits Database only (limited number of records) |
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| | COM_CLS | Commodity classification, from an MRDS list - Base metal, Precious metal, Other metal, Fe(Mn), etc.. |
| | DEP_SIZE | MRDS has specific definitions for Small, Medium, and Large deposit size for different commodities. These were not useful. A general field indicating relative importance of a deposit. |
| | REV_DEP_TYPE | General type of deposit or resource present at the site, revised from USGS MRDS type by F.M. Beck. |
| | MODEL_NUM | Model number assigned by F.M. Beck, Inc. from Cox, D. P., and Singer, D. A. (editors), Mineral deposit models: U.S. Geological Survey, Bulletin 1693, 379 p. |
| | WORKINGS | Description of workings. |
| | REP_AFF | Reporter affinity. |
| | REP_DATE | Report date. |
| | UPDATER | Record update author. |
| | UPDATE_DATE | Date of update. |
| | INFO_SOURCE | Source of information for record. |
| | STATUS_TEXT | Status of locality - occurrence, active prospect, producer, etc. |
| | OTHER_RECS | If a common name is assigned to a group of deposits, such as the Blue Hill District, or Aroostook Co. Manganese deposits, it is indicated here. |
| | GEOL_COMM | Geologic comments entered by F.M. Beck, Inc. |
| | COMMENTS | General comments. |
