Indian Springs and Delano Mining Districts

Region West, Southwest
Mineral systems
Deposit types
Critical minerals
Other minerals

Information leading to the delineation of this focus area

Basis for focus area Tungsten skarn district outline from USMIN location polygon NV00117.
Identified resources Identified resources and historical production of tungsten.
Production Indian Springs mine (1970-1975): 12,200 tons ore, 0.25% WO3 (Stager and Tingley, 1988).
Status Past mining.
Estimated resources Indian Springs prospect: Indicated resource of 9,800,000 metric tons with grade of 0.17% WO3 for a calculated contained 13,000 metric tons W; Inferred resource of 7,400,000 metric tons with grade of 0.17% for a calculated contained 10,000 metric tons W (More and Stryhas, 2007b).
Geologic maps Coats (1987), scale 1:250,000.
Geophysical data Inadequate aeromagnetic and aeroradiometric coverage.
Favorable rocks and structures Easterly dipping Permian age clastic and carbonate sedimentary rocks were intruded by a late Cretaceous to Tertiary age two-mica quartz monzonite intrusive, resulting in contact metamorphosed tactite; minor amounts of W are associated with tactite formation. The bulk of the W mineralization occurs with later stage granitic dikes, alteration, and quartz veins and veinlets (stockworks) (More and Stryhas, 2007b).
Deposits Indian Springs mine (MRDS dep_id: 10174157; USMIN Site_ID: NV00115), Emigrant Springs occurrence (MRDS dep_id: 10046014), Delano mining district (USMIN Site_ID: NV00117).
Evidence from mineral occurrences MRDS; USMIN.
Geochemical evidence Quartz veins also contain abundant pyrite and some molybdenite in pegmatite lenses and near zones of potassic and sericitic alteration.
Geophysical evidence Unknown.
Evidence from other sources More and Stryhas (2007b).
Cover thickness and description Exposed at surface.
Authors John L. Muntean.
New data needs Geologic mapping, geophysics.
Geologic mapping and modeling needs Updated geologic mapping.
Geophysical survey and modeling needs High-resolution, Rank 1 aeromagnetic and aeroradiometric surveys.
Digital elevation data needs Lidar in progress (GeoDAWN).