Porphyry Sn (granite-related)

Granite-related porphyry Sn systems form in back arc or hinterland settings by similar processes from fluids exsolved from more crustally contaminated S-type peraluminous plutons and stocks. At deep levels, LCT pegmatites emanate from plutons. Resulting ore deposits tend to be Cu and Mo poor and enriched in Li, Cs, Ta, Nb, Sn, W, Ag, Sb and In.
Color on map:

Deposit types

Name Commodities Critical minerals
Pegmatite LCT Li-Cs-Ta Li, Cs, Ta, Nb, Sn, Be, Sc
Greisen Sn, W, Be Sn, W, Be, Sc
Porphyry/skarn Sn, W, Be Sn, W, Be, Sc
Polymetallic sulfide S-R-V-IS Cu, Zn, Pb, Ag, Au Sn, Mn, Ge, Ga, In, Bi, Sb, As
Distal disseminated silver-gold Ag, Au Sb, As
High sulfidation Cu, Ag, Au Sn, Sb, As, Te, Bi
Lithocap alunite Al, K2SO4 (potash) Al, K2SO4, Ga
Lithocap kaolinite Kaolin Ga

References


Source: Hofstra, A.H., and Kreiner, D.C., 2020, Systems-Deposits-Commodities-Critical Minerals Table for the Earth Mapping Resources Initiative: U.S. Geological Survey Open-File Report 2020-1042, 24 p., https://doi.org/10.3133/ofr20201042.

List of Earth MRI focus areas with mineral system = Porphyry Sn (granite-related)

54 focus areas match these criteria.

Focus area Region States Mineral Systems Deposit types Commodities
Central Brooks Range Sn-W Alaska Alaska Porphyry Sn (granite-related) Greisen; Pegmatite LCT; Porphyry/skarn molybdenum
Darby-Hogatza Sn-W Alaska Alaska Porphyry Sn (granite-related) Greisen; Pegmatite LCT; Porphyry/skarn molybdenum
Kokrines-Hodzana Sn-W Alaska Alaska Porphyry Sn (granite-related) Greisen; Pegmatite LCT; Porphyry/skarn molybdenum
Kuskokwim-White Mountains Sn-W Alaska Alaska Porphyry Sn (granite-related) Greisen; Pegmatite LCT; Porphyry/skarn molybdenum
Lost River-Kougarok Sn-W Alaska Alaska Porphyry Sn (granite-related) Greisen; Pegmatite LCT; Porphyry/skarn molybdenum
Northern Alaska Range Sn-W Alaska Alaska Porphyry Sn (granite-related) Greisen; Pegmatite LCT; Porphyry/skarn molybdenum
Porcupine River Sn-W Alaska Alaska Porphyry Sn (granite-related) Greisen; Pegmatite LCT; Porphyry/skarn molybdenum
Yukon-Tanana Sn-W Alaska Alaska Porphyry Sn (granite-related) Greisen; Pegmatite LCT; Porphyry/skarn molybdenum
Animikie Red Ace Pegmatite North Central Wisconsin Porphyry Sn (granite-related) Pegmatite LCT (none)
Archean gneiss terranes North Central Iowa; Michigan; Minnesota; Nebraska; South Dakota; Wisconsin Porphyry Sn (granite-related) Pegmatite LCT; Porphyry/skarn (none)
Humboldt Granite North Central Michigan Porphyry Sn (granite-related) Porphyry/skarn (none)
Minnesota Quetico Province North Central Minnesota; North Dakota Porphyry Sn (granite-related) Pegmatite LCT; Porphyry/skarn (none)
Neoarchean Greenstone Belts of Minnesota, North Dakota and South Dakota North Central Minnesota; North Dakota; South Dakota Porphyry Sn (granite-related) Pegmatite LCT (none)
Southern Black Hills pegmatites North Central South Dakota Porphyry Sn (granite-related) Pegmatite LCT feldspar; mica
Southern Complex pegmatites North Central Michigan Porphyry Sn (granite-related) Pegmatite LCT (none)
Brunswick pegmatite field Northeast Maine Porphyry Sn (granite-related) Pegmatite LCT feldspar; mica
Connecticut pegmatites Northeast Connecticut Porphyry Sn (granite-related) Pegmatite LCT feldspar; gold; mica; silver
Drew Hill antimony prospect Northeast Maine Porphyry Sn (granite-related) Polymetallic sulfide S-R-V-IS cadmium; copper; gold; lead; silver
Gouldsboro antimony prospect Northeast Maine Porphyry Sn (granite-related) Polymetallic sulfide S-R-V-IS copper; gold; lead; silver
Grafton Pegmatite District Northeast New Hampshire Porphyry Sn (granite-related) Pegmatite LCT feldspar; gold; mica; silver
Keene Pegmatite District Northeast New Hampshire Porphyry Sn (granite-related) Pegmatite LCT feldspar; gold; mica; silver
Knox Mountain pluton Northeast Vermont Porphyry Sn (granite-related) Porphyry/skarn (none)
Lewiston area metasediments Northeast Maine Porphyry Sn (granite-related) Porphyry/skarn (none)
Massachusetts pegmatite Northeast Massachusetts Porphyry Sn (granite-related) Pegmatite LCT feldspar; mica
Oxford County pegmatite field Northeast Maine; New Hampshire Porphyry Sn (granite-related) Pegmatite LCT feldspar
Parker Mountain pegmatite Northeast New Hampshire Porphyry Sn (granite-related) Pegmatite LCT feldspar; mica
Raymond Pegmatite District Northeast New Hampshire Porphyry Sn (granite-related) Pegmatite LCT feldspar; mica
Tin in Eastern Maine Northeast Maine Porphyry Sn (granite-related) Greisen (none)
Topsham pegmatite district Northeast Maine Porphyry Sn (granite-related) Pegmatite LCT feldspar; gems; gold; mica; silver
Topsham tungsten Northeast Maine Porphyry Sn (granite-related) Porphyry/skarn (none)
Western Maine scheelite Northeast Maine Porphyry Sn (granite-related) Porphyry/skarn (none)
York County scheelite Northeast Maine; New Hampshire Porphyry Sn (granite-related) Porphyry/skarn lead; molybdenum; silver
NW Idaho-NE Washington beryllium Northwest Idaho; Washington Porphyry Sn (granite-related) Pegmatite LCT (none)
Philips Lake Northwest Washington Porphyry Sn (granite-related) Pegmatite LCT (none)
Silver Hill tin Northwest Washington Porphyry Sn (granite-related) Porphyry/skarn lead; silver
Brown Derby Rocky Mountains Colorado Porphyry Sn (granite-related) Pegmatite LCT mica
Copper Mountain Rocky Mountains Wyoming Porphyry Sn (granite-related) Greisen; High sulfidation; Pegmatite LCT; Porphyry/skarn copper; gold; silver
Meyers Ranch Rocky Mountains Colorado Porphyry Sn (granite-related) Pegmatite LCT feldspar; mica; thorium; uranium
Alabama pegmatite zone Southeast Alabama Porphyry Sn (granite-related) Pegmatite LCT (none)
Irish Creek Tin District Southeast Virginia Porphyry Sn (granite-related) Greisen (none)
Kings Mountain pegmatite district Southeast North Carolina; South Carolina Porphyry Sn (granite-related) Pegmatite LCT (none)
Little Friar Mountain pegmatite Southeast Virginia Porphyry Sn (granite-related) Pegmatite LCT (none)
North Carolina pegmatite zone Southeast North Carolina; Tennessee Porphyry Sn (granite-related) Pegmatite LCT (none)
Spruce Pine Area Southeast North Carolina Porphyry Sn (granite-related) Pegmatite LCT feldspar; high purity quartz; mica
Virginia pegmatite zone-Amelia County Southeast Virginia Porphyry Sn (granite-related) Pegmatite LCT feldspar; high purity quartz; mica
Zirconia Pegmatite Mining District Southeast North Carolina; South Carolina Porphyry Sn (granite-related) Pegmatite LCT feldspar
Birch Creek Southwest California Porphyry Sn (granite-related) Greisen; Pegmatite LCT copper; gold; lead; silver
Cal Blue Mine Southwest California Porphyry Sn (granite-related) Pegmatite LCT (none)
Peninsular Ranges pegmatites Southwest California Porphyry Sn (granite-related) Pegmatite LCT boron
Precambrian Franklin Mountain tin Southwest Texas Porphyry Sn (granite-related) Polymetallic sulfide S-R-V-IS copper; gold; lead; silver
Rociada Southwest New Mexico Porphyry Sn (granite-related) Pegmatite LCT (none)
Trinity Range-Kamma Mountains Southwest Nevada Porphyry Sn (granite-related) Polymetallic sulfide S-R-V-IS copper; gold; lead; silver
White Picacho Southwest Arizona Porphyry Sn (granite-related) Pegmatite LCT copper; feldspar; gold; lead; mica; molybdenum; silver
Gorman tin district Southwest California Porphyry Sn (granite-related) Polymetallic sulfide S-R-V-IS copper; gold; iron; lead; molybdenum; silver