There are a number of mineralizing styles and models in the Republic/Greenwood Districts:
1) Gold and Copper-Gold Skarns: Fe-Cu massive sulfide/oxide horizon in Brooklyn Fm. Present in all major “skarn” deposits in the district. Examples are Phoenix, Motherlode and Crown Jewel (“Buckhorn Mtn”).
2) Mesothermal Quartz Veins with Gold (+/- Ag, Pb, Zn). Examples are Providence Mine, Dentonia, Camp McKinney, May Mac. Polymetallic silver-lead-zinc veins with lesser gold.
3) Epithermal Quartz Veins commonly in the Republic District and often marked by the paleosurface between the Eocene Marron and Kettle River Formations and the overlying Oligocene Klondike. Examples are Mountain Formation Knob Hill Mine, Emanuel Creek, Union Mine and Picture Rock Quarry.
4) Cretaceous – Jurassic Alkalic Intrusives with Cu-Au-Ag (+/- PGE’s) with a strong spatial association between these intrusives and Jurassic thrust faults. Examples are Lexington-Lone Star alkalic porphyry type mineralization, Franklin Camp, Sappho cpy rich shears with PGE’s and Au, Golden Crown, Wildrose and Rossland type veins close spaced, parallel, en-echelon veins of gold in massive pyrrhotite-pyrite-chalcopyrite veins & quartz veins.
5) Gold Mineralization Associated with Serpentinite related to #3, #4 because an association with structure = an association with serpentinite. Known bodies of mineralization have traditionally been small, but often high grade. Examples are Athelstan – Jackpot - gold in ........
