Gold and silver will return to the London Metal Exchange soon and China’s pollution crackdown may affect tin prices as many smelters have shut down.

Gold and Silver Return to the LME

The London Metal Exchange said today it is planning to launch spot and futures contracts for gold and silver in the first half of 2017, adding to its list of products which includes copper and aluminum.

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The 139-year old exchange is working in collaboration with the World Gold Council, an industry body backed by gold mining companies such as Barrick Gold and Goldcorp, and is supported by five banks and proprietary trader OSTC, which have committed to provide liquidity.

China Cracks Down on Pollution

China could ramp up imports of refined tin as a string of environmental inspections at smelters in the world’s top producer of the metal curbs local output.

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Officials in eight provinces last month began inspecting metals producers including tin smelters, forcing some to shutter production while they look to comply with environmental standards, according to industry officials and analysts.