The 2019 performance of diversified mining and marketing company Glencore reflected the prolonged and uncertain trade deal negotiations, generally weaker prices for key commodities and some operational challenges experienced at the ramp-up and development of assets, CEO Ivan Glasenberg said on Tuesday. Adjusted earnings declined 26% to $11.6-billion, with UBS analysts commenting that the results turned out slightly better than expected. “Importantly, guidance is unchanged with unit costs slightly lower,” UBS said.