Utah Geological Survey

Utah FY22 Earth Mri Proposal for Reconnaissance Geochemistry Abstract Project Period 9 22 2022 to 9 21 2025TITLE Geochemistry of the West Desert Skarn, Utahdescription of Project the Utah Geological Survey Is Conducting a 400 Sample Regional Geochemical Assessment Over the West Desert ZN Cu in Skarn in the Fish Springs Mining District in Western Juab County, Utah the Fish Springs District Is in the Deep Creek Tintic Mineral Belt in the Basin and Range Province in West Central Utah the West Desert Skarn Is on the Northern End of the Fish Springs Range and Is Centered on an Eocene Monzonite Stock That Intruded Folded and Faulted Cambrian and Ordovician Basement It Is the Only Known Indium Resource in the U S Historic Mineralization Is Primarily PB Ag Vein and Replacement Deposits in the Silurian Laketown Dolomite Which Are Anomalous in as, CD, MN, Mo, V, and ZN Bleaching and Recrystallization of the Carbonate Rocks Along the Northwestern Range Front in the Fish Springs District and a Very Strong Magnetic High in the Pediment Led to Drill Testing and the Discovery of a Concealed, Eocene Age Felsic Intrusive Complex Dated at 38 5 1 0 Ma and the Associated West Desert ZN Cu in Skarn, Previously Known as the Crypto Skarn the Main Ore Hosts Are the Ordovician Ely Springs Dolomite and Pogonip Group, and Deeper Mineralization Is in the Cambrian Orr Formation Mineralization at West Desert Consists of Sphalerite With Lesser Chalcopyrite Occurring Commonly With Massive Magnetite in Skarn and Replacement Bodies With Widespread Marbelization and Hornfelsing of the Country Rock Around the Mineralization to Understand the Source and Subsequent Mobilization and Concentration of Indium, Both the Magmatic Complex and Paleozoic Basement Are Being Comprehensively Sampled to Delineate the Geochemical Signature of Barren, Altered, and Mineralized Zones Both Oxide and Sulfide This Sampling Will Be Done on Drillcore and Underground Surface Outcrop, Providing a 3D Geochemical Model of Enrichment and Depletion Zones That Will Also Be Able to Take Into Account Structural Controls Faults, Bedding, Etc Additionally, Because Sampling Will Include Mineralized Zones, Results Will Also Allow Assessment of the Potential Enrichment of Other Critical Minerals, Such as Germanium and Gallium, Which Are Also Commonly Associated With Zinc Mineralization Comprehensive Geochronology Will Be Conducted to Determine the Length of the Magmatic Event Further Isotopic and or Mineral Chemistry Will Be Carried Out as Needed to Fully Characterize the Source, Transport, and Concentration of Indium the Goals Are to 1 Identify the Source of Indium Enrichment, 2 Delineate Deportment of the Indium in Both the Oxide and Sulfide Zones of the Deposit, and 3 Evaluate the Geochemical Dispersion of Both Indium and the Overall Deposit Signature Potential Critical Minerals in Project Area Ga, Ge, in, ZN