整理：每日期货市场要闻速递（5月19日）

Group 1 - The London Metal Exchange (LME) is discussing the establishment of position limits to curb excessive speculation, with limits set to take effect from July 2026 to prevent holdings from exceeding total inventory levels [1] - Steel and silver e-commerce data indicates that total urban inventory this week is 7.7211 million tons, a decrease of 419,800 tons compared to last week, with construction steel inventory down by 268,800 tons [1] - The annual crop survey in Kansas shows that the expected wheat yield is 53 bushels per acre, the highest level since 2021 [1] Group 2 - Antofagasta's Zaldivar copper mine in Chile has received environmental approval from the local government to extend its operational period until 2028 [2] - The Guinea mining bureau has issued a suspension order for operations at a mining site, affecting companies like Shunda Mining, with a total capacity of approximately 40 million tons per year, and the timeline for resumption is currently unknown [2]