scholarly journals Investigation of a gold-silver-copper ore from Pyrotex Mining & Exploration Co., Ltd. North Caribou Lake, Ontario

1968 ◽  
Author(s):  
G I Mathieu ◽  
R W Bruce
Keyword(s):  
Lake Ontario ◽  
Copper Ore ◽  
Silver Copper ◽  
Gold Silver

Statewide Estimates of Undiscovered Deposits of Gold, Silver, Copper, Lead, and Zinc

2004 ◽  
Vol 13 (3) ◽  
pp. 201-207 ◽  
Author(s):  
Richard B. McCammon ◽  
David H. Root ◽  
Paul G. Schruben
Keyword(s):  
Silver Copper ◽  
Lead And Zinc ◽  
Gold Silver ◽  
Undiscovered Deposits ◽  
Copper Lead

Energy Dispersive X-Ray Spectrometry of Gold-Silver-Copper Standards for Comparison with Historic Gold Objects

1990 ◽  
Vol 185 ◽  
Author(s):  
S.M. White ◽  
R.J. Koestler ◽  
C. Blair ◽  
N. Indictor
Keyword(s):  
Elemental Composition ◽  
Ternary Mixtures ◽  
Energy Dispersive ◽  
X Ray ◽  
Silver Copper ◽  
Gold Silver

AbstractSeven ternary mixtures of gold(80-95%)-silver(4-15%)-copper(1-15%) were prepared as standards for the determination of elemental composition by energy dispersive X-ray spectrometry (EDS). Two geometric forms (flat and oblate) of the standards were prepared for comparison to the analyses of historic gold objects. Surface analyses were performed. Polished sections of the standards were also analysed Comparison between two methods for collecting EDS data is reported. The analyses are discussed in terms of developing a generalized methodology for estimating elemental composition of museum artifacts.

scholarly journals I. The liquation of gold and platinum alloys

1890 ◽  
Vol 47 (286-291) ◽  
pp. 180-186 ◽  
Keyword(s):  
Copper Alloys ◽  
Gold Alloys ◽  
Silver Alloys ◽  
Platinum Alloys ◽  
Silver Copper ◽  
Gold Silver ◽  
Almost All

It is a well known fact that when molten alloys of certain metals are cooled, some of the constituents separate and become concentrated either in the centre or in the external portions of the solidified mass; to this segregation the name of liquation is given. It is specially noticeable in the case of silver-copper alloys, and its importance is now being widely recognised in almost all branches of metallurgy. In the case of gold, however, the phenomenon of liquation does not appear to have been much observed. Gold alloys, to the value of many millions sterling, pass annually from hand to hand upon the results of assays cut from the external portions of ingots, which assays cannot, of course, be trustworthy, if the centre of the bars differs in composition from the external portions. Peligot has recently endeavoured to obtain evidence of liquation in gold-copper alloys, and has concluded that it does not exist. Roberts-Austen, who has devoted much time to the study of liquation, has also satisfied himself that gold-silver alloys do not rearrange themselves on cooling.

The Early Islamic Mining Boom

2019 ◽  
Vol 62 (1) ◽  
pp. 166-221
Author(s):  
Michael Morony
Keyword(s):  
Present Article ◽  
Late Antiquity ◽  
Private Property ◽  
Mining Technology ◽  
Islamic World ◽  
Silver Copper ◽  
Gold Silver ◽  
Early Islamic

AbstractThe present article shows that, according to archaeological and literary evidence, an expansion in mining occurred in the early Islamic world as a result of changes in mining technology at the end of Late Antiquity. The production of gold, silver, copper, iron, and other minerals is shown to have peaked in the eighth and ninth centuries and then to have declined during the tenth and eleventh centuries due to insecurity and/or exhaustion of the mines. Mining development was financed privately, and mines were usually private property.

Hardening of Gold-Based Alloys

1977 ◽  
Vol 56 (3) ◽  
pp. 335-345 ◽  
Author(s):  
Karl F. Leinfelder ◽  
Duane F. Taylor
Keyword(s):  
Heat Treatment ◽  
Dental Casting ◽  
Silver Copper ◽  
Casting Alloys ◽  
Gold Silver ◽  
Hardening Mechanisms ◽  
Dental Casting Alloys

The relationships between composition, heat treatment, hardness and microstructure have been investigated for a number of commercial dental casting alloys and for several series of experimental gold-silver-copper compositions. The results indicate that at least two distinct hardening mechanisms must occur in these alloys.

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