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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
schreyerite
Schreyerite, V 2 Ti 3 O 9 : New occurrence and crystal structure Available to Purchase
Schreyerite, V 2 Ti 3 O 9 , a new mineral Available to Purchase
A backscattered electron image of thin section UT134 where UK1 is shown rep... Available to Purchase
A backscattered electron image of thin section UT117 showing schreyerite ex... Available to Purchase
A polyhedral representation of the schreyerite structure projected approxim... Available to Purchase
Machiite, Al 2 Ti 3 O 9 , a new oxide mineral from the Murchison carbonaceous chondrite: A new ultra-refractory phase from the solar nebula Available to Purchase
A COMPARISON OF THE AVERAGE COMPOSITIONS, DETERMINED BY EMPA, OF SCHREYERIT... Available to Purchase
Morphology of niobian rutile microinclusions in schreyerite ( a ), berdesin... Available to Purchase
Scanning electron-microscopic image of schreyerite crystal studied by singl... Available to Purchase
The schreyerite structure shown as a closest oxygen-packing representation ... Available to Purchase
The Vanadium-bearing Oxide Minerals of the Green Giant Vanadium-graphite Deposit, Southwest Madagascar Available to Purchase
Kyzylkumite, Ti 2 V 3+ O 5 (OH): new structure type, modularity and revised formula Available to Purchase
Vestaite, ( Ti 4 + Fe 2 + ) Ti 3 4 + O 9 , a new mineral in the shocked eucrite Northwest Africa 8003 Available to Purchase
Critical Elements in Alkaline Igneous Rock-Related Epithermal Gold Deposits Available to Purchase
Abstract Alkaline igneous rock-related gold deposits, primarily of Mesozoic to Neogene age, are among the largest epithermal gold deposits in the world. These deposits are a subset of low-sulfidation epithermal deposits and are spatially and genetically linked to small stocks or clusters of intrusions possessing high alkali-element contents. Critical-, near-critical, or energy-critical elements associated with these deposits are F, platinum-group elements (PGEs), rare earth elements (REEs), Te, V, and W. Fluorine and tungsten have been locally recovered in the past, and some other elements could be considered as future by-products depending on trends in demand and supply. The Jamestown district in Boulder County, Colorado, historically produced F from large lenticular fluoritebearing breccia bodies and Au-Te veins in and adjacent to the Jamestown monzonite stock. Several hundred thousand metric tons (t) of fluorspar were produced. Some alkalic epithermal gold deposits contain tungstenbearing minerals, such as scheelite, ferberite, or wolframite. Small tungsten orebodies adjacent to and/or overlapping the belt of Au telluride epithermal deposits in Boulder County were mined historically, but it is unclear in all cases how the tungsten mineralization is related genetically to the Au-Te stage. Micron-sized gold within deposits in the Ortiz Mountains in New Mexico contain scheelite but no record of tungsten production from these deposits exists. The most common critical element in alkaline igneous-rock related gold deposits is tellurium, which is enriched (>0.5%) in many deposits and could be considered a future commodity as global demand increases and if developments are made in the processing of Au-Te ores. It occurs as precious metal telluride minerals, although native Te and tetradymite (Bi2Te2S) have been reported in a few localities. Assuming that the Dashigou and adjacent Majiagou deposits in Sichuan province, China, are correctly classified as alkalic-related epithermal gold deposits (exact origin remains unclear), they represent the only primary producers of Te (as tetradymite) from this deposit type. It is worth noting that some epithermal veins (and spatially or genetically related porphyry deposits) contain high contents of Pt or Pd, or both. The Mount Milligan deposit typically contains >100 ppb Pd, and some values exceed 1,000 ppb. However, owing to the presence of other large known PGE resources in deposits in which PGEs are the primary commodities, it is unlikely that alkaline-related epithermal gold deposits will become a major source of PGEs. Similarly, many epithermal gold deposits related to alkaline rocks have high vanadium contents, but are unlikely to be considered vanadium resources in the future. Roscoelite (V-rich mica) is a characteristic mineral of alkalic-related epithermal deposits and is particularly abundant in deposits in Fiji where it occurs with other V-rich minerals, such as karelianite, Ti-free nolanite, vanadium rutile, schreyerite, and an unnamed vanadium silicate. A few alkaline intrusive complexes that contain anomalous concentrations of gold or were prospected for gold in the past are also host to REE occurrences.The best examples are the Bear Lodge Mountains in Wyoming and Cu-REE-F (±Ag, Au) vein deposits in the Gallinas Mountains in New Mexico, which have REE contents ranging up to 5.6% in addition to anomalous Au.