Some Ore Deposits in Maine and the Milan Mine, New Hampshire

by

William H. Emmons

USGS Bulletin 432, 1910

CONTENTS.

• Introduction 7
• • General Statement 7
  • Acknowledgments 8
  • Bibliography 8
  • Geography 10
  • Mining development 10
  • Production of metals 11
• Geology 11
• • Sedimentary rocks 11
  • • Ellsworth schist 11
    • Islesboro formation 12
    • Battie quartzitc 12
    • Penobscot formation 12
    • Ames Knob formation 12
    • Perry formation , 13
  • Igneous rocks 13
  • • Castine formation 13
    • North Haven greenstone 13
    • Thorofarc andésite 14
    • Vinalhaven rhyolite 14
    • Granite 14
    • Diorite 15
    • Basic lava flows 15
    • Basic dikes 15
• Ore deposits 15
• • Classification 15
  • • Deposits older than regional metamorphism 15
    • • Distribution and character 15
      • Metamorphism 18
      • Origin 20
    • Deposits associated with granite intrusions 20
    • • Fissure veins 20
      • Molybdenite and lead deposits 21
    • Deposits associated with diabase and trap 22
• Mineralogy 22
• Distribution of outcrops 24
• Oxidation and secondary enrichment 25
• Future of the mines 26
• • Lead, zinc, and silver 26
  • Copper 27.
• Summary of geologic events as related to ore deposits 27
• • Pre-Cambrian and Cambrian time 28
  • Silurian time 29
  • Devonian time 29
  • Quaternary time 30
• Descriptions of mines 30
• • Mines of Hancock County 30
  • General statement 30
  • Douglas mine 31
  • Twin Lead mine 32
  • Blue Hill mine 33
  • Stewart mine 33
  • Mammoth mine 34
  • Owen mine 34
  • Owen lead prospect 34
  • Granger mine 35
  • Weil Freddie mine 35
  • Ta ploy mine 35
  • Eggemoggin mine 36
  • Deer Isle mine 37
  • Cape Rozier mine 38
  • Hercules mine 38
  • Jones & Dodge mine 38
  • Emerson mine 39
  • Sullivan, Waukeag, and Pine Tree mines 39
  • Gouldsborough mine 40
  • Franklin Extension mine 41
  • Copperopolis mine 41
  • Catherine Hill molybdenum mine 42
• Mines of Washington County 43
• • General statement 43
  • Cherryfield mine 43
  • Lubec lead mine 44
  • Denbow Point mine 45
  • Prospects in Pembroke 46
  • Cooper mine 47
• Mines in Somerset and Oxford counties 48
• • Robinson mine 48
  • Mount Glines deposits 49
• Milan mine, New Hampshire 50
• • General statement : 50
  • Geology 52
  • Minerals of the ore 54
  • Ore bodies 55
  • Summary of the genesis 59
• Index

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