ABB water meters | Reflection and experience on mid-term exams in the second semester of Grade 12, 400 words | Mass flowmeter

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Get extra points!! Given a source rock for gold and a reservoir fluid capable of transporting gold, it remains to consider an appropriate mechanism for gold precipitation within a structurally prepared, near-surface environment. One gold precipitation mechanism involves mixing of different fluid types, as documented and advocated by Henley and McNabb (1978), Henley and Ellis (1983), and Hedenquist (1983). Passive mixing of acid, near-surface waters with rising neutral to alkaline solutions results in destabilization of bisulfide complexes and formation of precious metal-bearing precipitates. Assuming there is a gold source rock and a fluid reservoir capable of transferring gold, it is also necessary to consider an appropriate mechanism for gold precipitation in a structurally configured and near surface environment. Henley and McNabb (1978), Henley and Ellis (1983), and Hedenquist (1983) argue in their literature that there is a gold precipitation mechanism that involves mixing various different fluids. The passive mixing of acidic substances, near surface water, and rising neutral to alkaline solutions leads to the destabilization of disulfide complexes and the formation of noble metal precipitates. The evidence available from hot spring deposits, however, suggests that boiling is the primary mechanism responsible for gold precipitation. Boiling causes cooling, oxidation, and an increase in solution pH, all very effective mechanisms for gold deposition (Romberger, 1983). The presence of base metal sulfides and adularia, co-precipitated with gold

abb water meters|mass flowmeter
and abundant silica in hot spring deposits, also suggests a boiling rather than a mixing mechanism for precious metal mineralization (e.g., Fournier, 1983). However, existing evidence from hot spring deposits suggests that boiling is the main mechanism leading to gold precipitation. The cooling, oxidation, and increase in solution pH caused by boiling are all very effective mechanisms for gold deposition (Romberger, 1983). The discovery of base metal sulfides and plagioclase that precipitate together with gold, as well as abundant silicon, in hot spring deposits also reflects that the mineralization of precious metals is formed by boiling mechanism rather than mixing mechanism (e.g. Fournier, 1983). Rapid and near-instantaneous channeling of fluid through permeable vent breccias and peripheral fractured stockworks over a heated geothermal reservoir increases the pressure gradient in a convection fluid column. Donaldson (1968) has shown that the boiling level in a column of given permeability can be raised to within a few hundred meters of the surface by increasing the flow rate toward a limit set by the cold water hydrostatic head. The rapid and quasi instantaneous extraction of fluid through permeable breccia and peripheral fracture network veins on a heated geothermal reservoir increases the pressure gradient within the convective fluid column. Donaldson (1968) showed that the boiling height within a fluid column with a specified permeability can be increased to only a few hundred meters above the surface by utilizing the restriction set by accelerating the flow rate towards the cold head pressure. Precious metals are thereby lifted into the hot spring environment above an elevated boiling level and precipitated alo

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