WebEpithermal Au deposits extend from shallow crustal levels (<1 km) to near porphyry levels where the low sulphidation quartz-sulphide Au + Cu deposits are transitional to D veins described in the porphyry Cu literature (Gustafson and Hunt, 1975), and so approach mesothermal levels of formation in the original definition of the term (Lindgren, 1922). WebCharacteristics of D veins. a A pyrite vein (D1) with muscovite–illite–chlorite halo crosscut Eocene volcanic rock that was affected by phyllic alteration. b A photomicrograph …
Polymetallic replacement deposit - Wikipedia
WebJan 25, 2024 · Veins are the crystaline product of deposition from hydrothermal fluids. They can be compositionally extremely variable depending on the source fluid. They can range from millimetre, to kilometre in scale. They form as response to fracturing in the host rock which allows the hydrothermal fluids to enter the host rock and then precipitate. Webporphyry deposits occur in the circum-Pacific and commonly contain 0.3 to 1.6 g/t gold. The general characteristics of porphyry systems include: 1) small diameter (<2 km) causative … sighted define
POLYMETALLIC VEIN AND REPLACEMENT DEPOSITS …
WebAug 1, 2024 · In shallow (≲1.5 km) porphyry deposits, rapid decompression can also result in quartz precipitation, forming so-called banded veins. The high-temperature quartz in A … WebJul 20, 2024 · “A-veins” and “D-veins” of Gustafson and Hunt, 1975), have been found in the fanglomerate formation cropping out over an area measuring 1250 meters by 800 meters. Heavy mineral associations in the fanglomerate are identical to those from outcropping Laramide rocks of the Diamond Joe porphyry copper system, located 12 kilometers to the ... WebCordilleran Polymetallic Bodies and Veins. Overprint Porphyry and Skarn Mineralization. Río Blanco. La Granja. Cañariaco Tantahuatay- Mina Conga / La Carpa / Amaru / Huayllamachay Antakori Corona Michiquillay Yanacocha El Galeno Collpayoc Sayapullo Magistral La Zanja La Arena Racaycocha Antamina El Aguila Toromocho La Pampa o Pacoyán Carhuacayán … the pretty potato jewelry