| Deposit ID | 10218477 |
|---|---|
| MAS/MILS ID | 0230219901 |
| Record type | Site |
| Current site name | Portland Monson Slate Co. Mill |
| Point of reference | Ore Body |
|---|---|
| Geographic coordinates: | -69.48128, 45.27605 (WGS84) |
| Elevation | 244 |
| Location accuracy | 1000(meters) |
Political divisions (FIPS codes)
Piscataquis(county)
Maine(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Monson East(quadrangle 1:24,000 scale)
Dover-Foxcroft(quadrangle 1:100,000 scale)
Millinocket(quadrangle 1:250,000 scale)
Hydrologic units (watersheds)
Piscataquis River(hydrologic unit)
Penobscot(hydrologic accounting unit)
Penobscot(hydrologic subregion)
New England(hydrologic region)
| Country | State | County |
|---|---|---|
| United States | Maine | Piscataquis |
| Commodity | Importance |
|---|---|
| Slate, Dimension | Primary |
| Ore Body (1) | -69.48128, 45.27605 |
|---|
| Operation type | Processing Plant |
|---|---|
| Development status | Plant |
| Commodity type | Non-metallic |
| Significant | No |
| Plant type | Beneficiation (Mill) |
| Plant subcategory | Crush |
| Ownership category | Private |
|---|
| Type | Unknown |
|---|---|
| Owner | Portland Monson Slate Co. |
| ID | 1700186 |
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| U.S. Bureau of Mines | Minerals Availability System | MAS | 0230219901 | |
| Mine Safety and Health Administration | MSHA | MSHA | 1700186 |
MSHA LIST 11-23-79 IS LAST ENTRY; ASSUME STATUS = CLOSED
PLANT PROCESSES SLATE
RCF LIST 10-28-81
MSHA INSP. 1-31-79
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 03-NOV-1983 | Eastern Field Operations Center (EFOC) | U.S. Bureau of Mines |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.
| Status | Abandoned since 05/21/1982 |
|---|---|
| MSHA mine ID | 1700186 |
| Mine name (MSHA) | Portland Monson Mill |
| Current operator | Portland-Monson Slate Company |
| Current controller (parent) | John M Tatko Jr |
| Mine type | Facility (Metal / non-metal) |
MSHA cross-reference per the original MRDS record. Mine status and operator reflect MSHA's last published Mines export (February 2025); MSHA's public bulk feed has been unavailable since, so this may be out of date. See the Mine Data Retrieval System for current status.
Open MSHA's Mine Data Retrieval System for inspections, accidents, and violations for this mine.