Tanzania's government has revoked 40 mining licenses after companies failed to develop their concessions within the legally required 18-month window, according to Mines Minister Anthony Mavunde. The move reflects Tanzanian authorities' frustration with firms accused of sitting on land without extracting resources, which officials say undermines growth in the country's mining sector. An additional 43 licenses are reportedly under threat, with the companies concerned given 30 days to comply with legal requirements or face further revocations — a warning that comes as global demand for critical minerals and surging gold prices make African mining rights increasingly valuable.