Katahdin Iron WorksPast Producer • Iron, Sulfur-Pyrite
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Andalusite OccurrenceOccurrence •
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Portland Monson Slate CoPast Producer • Slate, Dimension
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Haley Construction IncPast Producer • Sand and Gravel, Construction
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Portland Monson Slate CoPast Producer • Slate, Dimension
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J.L. BishopPast Producer • Sand and Gravel, Construction
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Boulder Train, KatahdinOccurrence • Molybdenum
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Warren PitProducer • Sand and Gravel, Construction
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Boston & Maine QuarryPast Producer • Slate, Dimension
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Unnamed MineProspect • Silver
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Port. Univ. Crusher Farrin Bros.Plant • Sand and Gravel, Construction
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Unnamed QuarryPast Producer • Slate, Dimension
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Sebec Lake OccurrenceOccurrence • Lead
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Burma QuarryPast Producer • Slate, Dimension
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Monson Pond QuarryPast Producer • Slate, Dimension
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Sangerville Pit & MillProducer • Sand and Gravel, Construction
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Number 5 MineProducer • Slate, Dimension
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Thomas QuarryPast Producer • Slate, Dimension
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Foss QuarryPast Producer • Stone, Crushed/Broken
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Highland QuarryPast Producer • Slate, Dimension
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Farm Quarry No. 1Past Producer • Slate, Dimension
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Williams QuarryPast Producer • Slate, Dimension
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Unnamed MineOccurrence • Gold
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Dirigo QuarryUnknown • Slate, Dimension
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Dover-Foxcroft ProspectOccurrence • Manganese
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Underground QuarryPast Producer • Slate, Dimension
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Pine Tree QuarryPast Producer • Slate, Dimension
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Slate QuarryPast Producer • Slate, Dimension
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Lowell QuarryPast Producer • Slate, Dimension
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Monson-Hebron QuarryPast Producer • Slate, Dimension
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Chiastolite ProspectOccurrence • Kyanite
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Cora QuarryPast Producer • Slate, Dimension
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Slate QuarryPast Producer • Slate, Dimension
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Leighton QuarryPast Producer • Slate, Dimension
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Cove QuarryPast Producer • Slate, Dimension
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Unnamed QuarryPast Producer • Slate, Dimension
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Milo PitPast Producer • Sand and Gravel, Construction
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Unnamed QuarryPast Producer • Slate, Dimension
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Big Kineo QuarryPast Producer • Slate, Dimension
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Farm Quarry No. 2Past Producer • Slate, Dimension
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Brownville Junction PitProducer • Sand and Gravel, Construction
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West Monson QuarryPast Producer • Slate, Dimension
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Portland Monson Slate Co. MillPlant • Slate, Dimension
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Blanchard QuarryPast Producer • Slate, Dimension
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Bonded QuarryPast Producer • Slate, Dimension
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Hillside QuarryPast Producer • Slate, Dimension
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Unnamed QuarryPast Producer • Slate, Dimension
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Oakland QuarryPast Producer • Slate, Dimension
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Eastern QuarryPast Producer • Slate, Dimension
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Merrill QuarryPast Producer • Slate, Dimension
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Monson-Maine QuarryPast Producer • Slate, Dimension
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Stanchfield QuarryPast Producer • Slate, Dimension
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Graphite OccurrenceOccurrence • Graphite
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Farm Quarries Nos. 3 & 4Past Producer • Slate, Dimension
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Forest QuarryPast Producer • Slate, Dimension
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Cement Pit QuarryPast Producer • Slate, Dimension
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Weston Farm ProspectProspect • Copper
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Foss QuarryPast Producer • Stone, Crushed/Broken
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Imperial QuarryUnknown • Slate, Dimension
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Katahdin Pyrrhotite DepositPast Producer • Sulfur
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Eureka QuarryPast Producer • Slate, Dimension
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Queen City QuarryPast Producer • Granite
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Wilkens QuarryPast Producer • Slate, Dimension
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Old Granite QuarryPast Producer • Granite
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Foss Farms ProspectUnknown •
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Weston QuarryPast Producer • Stone, Crushed/Broken
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Number 2 MinePast Producer • Slate, Dimension
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Brownville QuarryPast Producer • Slate, Dimension
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General Slate Co. QuarryPast Producer • Slate, Dimension
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Spalding Herrick PitProducer • Sand and Gravel, Construction
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Bennet MinePast Producer • Zinc
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Unnamed MineProspect • Silver
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Moosehead QuarryPast Producer • Slate, Dimension
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Brawn QuarryPast Producer • Granite
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Priestly LakeOccurrence • Molybdenum
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Ross Cove ProspectOccurrence • Zinc
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