After years of slumping, mineral exploration is turning around. Business had been sagging as investors expressed disappointment in their returns while commodity prices steadily fell. For the first quarter of 2017, however, exploration spending increased for the first time in five years. Some corporate leaders now believe market prices have now recovered enough to justify the risk; others are running out of in-demand metals such as copper. Andrew Michelmore of MMG, Ltd., explained that acquisitions are out of the question when nobody has copper, zinc, or nickel. Strategies for more efficient exploration include working in countries with stable governments and access to high-end technology. Innovations helping exploration companies prospect deeper and cheaper include underground drones and atomic dielectric resonance. On-site testing and faster drills can further hasten finds. Another sign that exploration is on the rise is increased activity at companies that supply equipment used in geological exploration.