Metal occurrence

Various mineral prospects and minor metal occurrences are found in the study area, including Pb, Zn and Sn deposits north-east of Broken Hill, Au deposits near Tibooburra and Au, Cu and Pb deposits north of Cobar (Figure 1). 

Gmelin Handbook of Inorganic Chemistry, System No. 68, Platinum. Main Volume, (a) Part A in Sections 1-6, 1938-1951 (Platinum Metals, Occurrence, History, Preparation, Alloys) (b) Part B The Element in Sections 1-4,1939-1942, Physical and Electrochemical properties of Platinum (Chemical reactions of Pt in Section 4) (c) Part C The Compounds of Platinum. Section 1. Compounds with Noble Gases, H, O, N, Halogens, S, Se, Te, B, C,Si, P, As, Sb, Bi, 1939 (d) Section 2. Compounds with the alkali metals and ammonium, mainly the alkali metal platinum double salts, 1940 . (e) Section 3 Other Compounds, 1940 (f) Part D Complexes with Neutral ligands, 1957. Supplement Volume (g) Part A. Section 1. Technology of Platinum Metals. 1986 (h) Section 2. Isotopes, Atoms, Molecules and Clusters. 1989. 

Casparrini, Claudia. Gold and Other Precious Metals Occurrence, Extraction, Applications. 3d ed. Toronto Space Eagle, 2000. Examines where precious metals are found and how they are mined and used. 

A process involving combined corrosion and straining of the metal due to residual or applied stresses. The occurrence of stress corrosion cracking is highly specific only particular metal/environment systems will crack. 

Kofman R ef a/1989 Solid-liquid transition of metallic clusters occurrence of surface melting Physica A 157 631 Kofman R ef al 1994 Surface melting enhanced by curvature effects Surf. Sc/. 303 231... 

Occurrence. Niobium and tantalum usually occur together. Niobium never occurs as the metal, ie, ia the free state. Sometimes it occurs as a hydroxide, siUcate, or borate most often it is combiaed with oxygen and another metal, forming a niobate or tantalate ia which the niobium and tantalum isomorphously replace one another with Htde change ia physical properties except density. Ore concentrations of niobium usually occur as carbonatites and are associated with tantalum ia pegmatites and alluvial deposits. Principal niobium-beariag minerals can be divided iato two groups, the titano- and tantalo-niobates. 

Occurrence. The metal sulfides, which are scattered throughout most of the world, have been an important source of elemental sulfur. The potential for recovery from metal sulfides exists, although these sources are less attractive economically and technologicaky than other sources of sulfur. Nevertheless sulfide ores are an important source of sulfur in other forms, such as sulfur dioxide and sulfuric acid. 

W. Burkart, in E. Merian, ed., Metals and Their Compounds in the Environment, Occurrence, Mnaljsis, and Biological Kelevance, VCH, New York, 1991, pp. 1275-1287. 

Occurrence. Carbon monoxide is a product of incomplete combustion and is not likely to result where a flame bums in an abundant air supply, yet may result when a flame touches a cooler surface than the ignition temperature of the gas. Gas or coal heaters in the home and gas space heaters in industry have been frequent sources of carbon monoxide poisoning when not provided with effective vents. Gas heaters, though properly adjusted when installed, may become hazardous sources of carbon monoxide if maintained improperly. Automobile exhaust gas is perhaps the most familiar source of carbon monoxide exposure. The manufacture and use of synthesis gas, calcium carbide manufacture, distillation of coal or wood, combustion operations, heat treatment of metals, fire fighting, mining, and cigarette smoking represent additional sources of carbon monoxide exposure (105—107). 

The occurrence of stereospecific polymerization in solution has been explained by the stetic restrictions of ligands bonded to the metal center. For example, the following stmcture has been postulated as an intermediate in solution catalysis (68) ... 

Thiazole, 4-methyl-5-(2-hydroxyethyl)-in thiamine biosynthesis, 1, 97 Thiazole, 4-methyl-2-methylami nosynthesis, 6, 300 Thiazole, 4-methyl-2-phenyl-alkylation, 6, 256 mercuration, 6, 256 Thiazole, 2-(methylthio)-methylation, 6, 290 thermodynamic values, 6, 291 Thiazole, 2-methylthio-5-phenyl-synthesis, 5, 153 Thiazole, 4-methyl-5-vinyl-occurrence, 6, 327 Thiazole, 2-phenyl-acetylation, 6, 270-271 Conformation, 6, 237 synthesis, 5, 113, 6, 306 Thiazole, 4-phenyl-conformation, 6, 237 2,5-disubstituted synthesis, 6, 304 Thiazole, 5-phenyl-conformation, 6, 237 Thiazole, 2-phenyl-5-triphenylmethyl-synthesis, 6, 265 Thiazole, 2-(2-pyridyl)-metal complexes, 5, 51 6, 253 Thiazole, 4-(2-pyridyl)-metal complexes, S, 51 6, 253 Thiazole, tetrahydro-ring cleavage, 5, 80 Thiazole, 2,4,5-trimethyl-occurrence, 6, 327... 

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