exogangue

English

Etymology

From exo- +‎ gangue.

Noun

exogangue (usually uncountable, plural exogangues)

1. (mining) Gangue that is located outside phosphatic grains.

   Antonym: endogangue

   • 1990, George Edward Ericksen, John Adam Reinemund, María Teresa Cañas Pinochet (editors), Geology of the Andes and Its Relation to Hydrocarbon and Mineral Resources, page 263:

     The exogangue is composed of diatom fragments with minor amounts of volcanic ash, very fine quartz and feldspar grains, sponge spicules, and organic matter.

   • 2009, Veena, Understanding Geology, page 276:

     The winnowing away of siliciclastic exogangue in nearshore locations is capable of converting a commercially low-grade deposit into a more uniform high-grade one.

   • 2016 September, Mâamri Alimi Jihen, Abbassi Leila, Batis Harrouch Narjes, “Characterization of the Oum El Khacheb phosphorites (South Tunisia) and enrichment of big rejections by grinding”, in International Journal of Mining Science and Technology, volume 26, number 5, →DOI, pages 833-842:

     The observation O.E.K’s phosphates under binocular magnifying glass, after mixing simples with water shows that: the phosphatic elements are primarily made up of pellets, osseous remains, tooth of squales and oolites; the exogangue is composed of quartz, calcite, dolomite, gypsum and clay; the endogangue is not very abundant about 3%.