Gold costs were about $317 per troy ounce in 2007, but these can vary widely depending on mining type and ore quality; global mine production amounted to 2,471.1 tonnes. After initial production, gold is often subsequently refined industrially by the Wohlwill process which is based on electrolysis or by the Miller process, that is chlorination in the melt. The Wohlwill process results in higher purity, but is more complex and is only applied in small-scale installations. Other methods of assaying and purifying smaller amounts of gold include parting and inquartation as well as cupellation, or refining methods based on the dissolution
Refine S7 Refine S7 The Refine S7 is a mid-size CUV that was produced by JAC Motors under the Refine sub-brand and positioned above the compact Refine S5. A 1.5L turbo putting out 174hp and 251nm of torque and a 2.0L turbo producing 190hp and 280nm of torque is available, both available with a six-speed manual transmission or a six-speed DCT. The engine lineup of the Refine S7 is exactly the same as the Refine A60 sedan. The Refine S7 is available in both five-seat and seven-seat versions. Pricing of the Refine S7 ranges from 109,800 yuan to 129,800 yuan. A facelift