East Tintic District Geology

Geologic Model and Mineralization

  • Tintic is the second most productive mining district in Utah, after Bingham
  • Most of the historical polymetallic production came from 20 MT of Ag-Pb (Zn)rich carbonate replacement ore bodies with main sulphides minerals; galena, sphalerite and Ag sulphosalts
  • A second style of mineralization exploited were veins and breccias hosted in a brittle quartzite that contain higher Cu-Au-Ag grades associated to enargite, famatinite, and tenantite-tetrahedrite and alteration mineral assemblages typical of high sulphidation systems including pyrophyllite, dickite, and alunite. The newly discovered T2 type mineralization is similar but unique within the telluride dominant zones with low sulphides content and is not refractory.
  • The carbonate replacement mineralization represents the intermediate sulphidation end member developed within the reactive calcareous sequence
T2 Thin section showing Native Gold (4) and Au – Ag rich telluride minerals, Petzite (2), Hessite (3), xocomectalite (5) and quartz (1).

Styles of Mineralization Within the Tintic District

1-Advanced argillic alteration: NNE trend, probably marking a lineament of deeper porphyry centers at depth. Very limited Historic drill testing (8 holes) intersected low grade porphyry mineralization. Remnant Lithocaps (Sky blue)

2-Epithermal High-Grade Au-Ag: developed at the contact between lower quartzite and upper Volcanic and Sedimentary Rocks, along a NNE trend related to a fault zone and anticline axis. Recent discovery at Trixie (T2) and excellent exploration potential along the +5 km NNE trend.

3-Carbonate Replacement: Ag-Pb-Zn : Located more distal from causative porphyry centers on the margins of district. Most of the historical production of Tintic. The Burgin deposit is an example