Проявление золоторудных гнезд в окварцованных зонах шахты Гвинфинидд: геологическое объяснение эффекта самородка

Gold-bearing quartz reefs commonly show extremely erratic and unpredictable grade variation, although gross geological continuity may be good. This type of variation is often described as being nuggety or having a high nugget effect and can be measured quantitatively using the semivariogram. Understanding of geological features such as reef texture and structure will provide improved models for the interpretation of assay data, drill core descriptions, etc.

Оценка минеральных ресурсов структурно-сложных и прерывающейся минерализации с применением нелинейной геостатистики: на примере изучения мезотермального золотого оруденения Северной Канады

An estimation of resources of structurally complex gold lodes and stockworks represents a challenging task for geoscientists due to the complex geometry of the lodes and discontinuous grade. In the present case study, the resource of a gold stockwork has been estimated by uniform conditioning after the lode has been subdivided into geostatistically defined domains using the indicator probability model.

The Alpine-Balkan-Carpathian-Dinaride (ABCD) belt is one of the world’s oldest mining areas and played a major role in the history of European civilizations, from well before the peak of the Greek and Roman civilizations up untilthe present day. Today, it is Europe’s premier Cu-Au (-Pb-Zn-Ag) province, especially for gold-rich deposits associated with calc-alkaline magmatism, which have become a focus of renewed exploration interest after the political change in the eastern part of CentralEurope. The Alpine–Balkan–Carpathian–Dinaride metallogenic and geodynamic province is part of the AlpineHimalayan orogenic system which extends from western Europe through Iran and the Himalayas to China and Malaysia.

The Asian continent formed during the past 800 m.y. during late Neoproterozoic through Jurassic closure of the Tethyan ocean basins, followed by late Mesozoic circum-Pacific and Cenozoic Himalayan orogenies. The oldest gold deposits in Asia reflect accretionary events along the margins of the Siberia, Kazakhstan, North China, Tarim–Karakum, South China, and Indochina Precambrian blocks while they were isolated within the Paleotethys and surrounding Panthalassa Oceans. Orogenic gold deposits are associated with large-scale, terrane-bounding fault systems and broad areas of deformation that existed along many of the active margins of the Precambrian blocks. Deposits typically formed during regional transpressional to transtensional events immediately after to as much as 100 m.y. subsequent to the onset of accretion or collision. Major orogenic gold provinces associated with this growth of the Asian continental mass include:

Совет Министров СССР постановлением от 30 ноября 1981 г. утвердил новую «Классификацию запасов месторождении и прогнозных ресурсов твердых полезных ископаемых». В соответствии с этой Классификацией ГКЗ СССР при участии Министерства геологии СССР и Министерства цветной металлургии СССР разработана Инструкция по ее применению к золоторудным месторождениям.
Выполнение требований Инструкции обязательно для всех организаций, независимо от их ведомственной подчиненности, при разведке и разработке золоторудных месторождений, проектировании предприятий по добыче и переработке руд.
С выходом данной Инструкции утрачивает силу «Инструкция по применению Классификации запасов к коренным месторождениям золота», изданная в 1961 г.

Potassic igneous rocks were originally recognized in the late 19th century by Iddings (1895), who described some orthoclase-bearing basalts from the Yellowstone Park, Wyoming, and coined the term “shoshonite”. In the last century, petrologists generated many names for potassic igneous rocks which were either based on their mineralogy or, more commonly, based on the locality of their occurrence. The practice was to name a new rock after a place where it occurred —the type locality. These different names for essentially similar rocks from different localities led to great confusion (Sørensen 1974; De Wit 1989; Rock 1991; Peccerillo 1992; Soloviev 2014a).

Reduced intrusion-related gold deposits have become a new, low-grade, large-tonnage exploration target during the last decade. The best recognized examples of such deposits are recognized throughout the Tintina Gold Province of the northern North American Cordillera. Because such examples may have many features in common with orogenic gold deposits, such as anomalous Bi, W, and Te,

The Triassic Pulang porphyry Cu-Au deposit, located in the South Yidun terrane, is the oldest and one of the largest porphyry deposits in the southeastern Tibetan Plateau. The mineralization occurs mostly in the potassic alteration zone of the Pulang intrusive complex. U-Pb-He triple dating, namely apatite (U-Th)/He, zircon U-Pb, and zircon (U-Th)/He dating, together with inverse thermal modeling, reveals that the Pulang complex was emplaced at a paleodepth of ~5.0 to 6.5 km at 215 ± 2 Ma. The deep-level emplacement of the complex, coupled with the episodic replenishment of the magma chamber, gave rise to the establishment of a prolonged magmatic-hydrothermal system at Pulang. 

Статья посвящена оценке значимости золотоносных третичных терригенных отложений в мировой золотодобыче и выявлению характерных особенностей локализации связанных с ними месторождений. Целью данной работы является апробация предположения, что в формировании значительной части четвертичных россыпей, расположенных в пределах или вблизи границ кайнозойских осадочных бассейнов, главную роль может играть размыв и перемыв третичных промежуточных коллекторов.