Results 91 to 100 of about 86,925 (244)

Estimation of the wear rate associated with ball mill of Mahd Ad Dahab Gold Mine, Saudi Arabia (KSA) [PDF]

, 2018
Purpose. This study aims to estimate the wear of the middle chrome grinding balls in both dry and wet grinding media. The selected ball mill for this study is located at Mahd Ad Dahab Gold Mine, Saudi Arabia. Methods.
Abdelhaffez, G
core   +1 more source

Faith, gender and financial investment: Providence and Presbyterianism in Scotland and abroad

Asia‐Pacific Economic History Review, EarlyView.
Abstract Mid‐nineteenth century fictional representations of misdirected investment by widows and clergy position them as ignorant in financial matters and hence pitiable. While scholars have recognised female agency in nineteenth century commerce, insufficient attention has been paid to religious belief in financial decision‐making.
Jennifer Jones, Susan Poole
wiley   +1 more source

Porphyry and Epithermal Au-Cu Systems of the Southern Caucasus and Northern Iran

Bulletin of the Mineral Research and Exploration
This article presents tangible geological evidence for coexistence of porphyry copper and epithermal gold systems within single polygenic deposits and provides a paleothermophysical model for their origins.
Alexander G. Tvalchrelidze
doaj   +1 more source

Chernorechensk gold ore deposit (Eastern Donbass)

Геология и геофизика Юга России
Статья посвящена характеристике Чернореченского рудопроявления, – одного из перспективных золоторудных объектов Восточного Донбасса. Актуальность определяется необходимостью выявления промышленных запасов золота в Восточном Донбассе для диверсификации горнодобывающей отрасли. Цель.
openaire   +1 more source

Phased combined development of gold ore deposits

Sustainable Development of Mountain Territories
Introduction. It is noted that in the Russian gold mining industry, the profitability of gold production is associated with the development of technologies for leaching it from substandard ores and enrichment waste. It is shown that the priority aspect of the development of substandard raw materials is to increase the yield of more gold with acceptable
openaire   +1 more source

Tellurium, selenium and cobalt enrichment in Neoproterozoic black shales, Gwna Group, UK : Deep marine trace element enrichment during the Second Great Oxygenation Event [PDF]

, 2018
We are grateful to John Still for his skilled technical support and the ACEMAC facility at the University of Aberdeen. Research funded by NERC grant NE/M010953/1 and NERC facility grant IP-1631-0516. AJB is funded by NERC support of the Isotope Community
Armstrong, Joseph, Boyce, Adrian, Bullock, Liam A, Feldmann, Jörg, Parnell, John, Perez, Magali   +5 more
core   +2 more sources

The exploitation of silver deposits in early medieval Europe: some documentary, economic and social problems

Archaeometry, EarlyView.
Abstract Focusing on Southern Europe, this article sheds light on the mining landscape of the early Middle Ages. Based on the current state of historical and archaeological knowledge, the article raises a number of questions that can be extended to other European regions.
Nicolas Minvielle Larousse
wiley   +1 more source

EXPECTED OCCURRENCE OF THE BLIND ORE BODIES AT THE LOWER LEVELS OF THE BALEI DEPOSIT AND A MECHANISM OF THE RICH ORES FORMATION AT THE NEAR-SURFACE GOLD-SILVER ORE DEPOSITS

Известия высших учебных заведений: Геология и разведка, 2017
The gold ore chimneys of 2 types have been shown to be developed at the near-surface deposits of gold and silver ores. These types are: 1 - bulk ones, of the vein-nested-veinlet ore bodies of stockwork shapes and 2 - small pay streaks of the ore bodies ...
E. M. Nekrasov
doaj   +1 more source

Quality from Kent: Preliminary results from the analysis of fifth‐ to seventh‐century silver alloys

Archaeometry, EarlyView.
Abstract This paper explores early results from the chemical and lead isotope analysis of 30 silver‐alloy objects from southeast England dating between the fifth and seventh centuries CE, presenting limited aspects of the three main analyses that were conducted. First, a comparison of the results gained from surface x‐ray fluorescence (pXRF) values and
Toby F. Martin, Matthew J. Ponting
wiley   +1 more source

«PIONEER» GOLD ORE DEPOSIT: HISTORY OF DISCOVERY, GEOLOGICAL STRUCTURE AND ORE COMPOSITION

Messenger AmSU, 2020
Brief information about the history of the discovery of the large Pioner gold deposit in the Amur province is given. The main features of the geological structure of the deposit, located at the contact of the multiphase granitoid intrusion of the Early Cretaceous age and terrigenous rocks of the Middle-Late Jurassic, are shown.
openaire   +1 more source