The London Metal Exchange three-month copper price was trading at $10,406.50/mt ($4.72/lb) as of 1552 GMT, while on May 10, the LME 3M copper price hit a record high of $10,747.50/mt. A year ago, after the COVID-19 pandemic first hit, the price stood at $5,249/mt. Zambia uses a sliding scale to determine its mining royalty rate for …