American geologists have long used copper Lincoln pennies as scale indicators in photographs.
From the scienceblogs.com
American regulators are on the verge of approving physically backed copper exchange-traded funds, listed investment vehicles that have become hugely popular.
From the economist.com
American Tunnels is one of a string of at least four promising porphyry copper-gold prospects on the Agata Project, reflected by IP chargeability anomalies and porphyry-related features.
From the foxbusiness.com
American Zinc is the corporate predecessor of Cyprus Amax and the acreage is contaminated with lead, arsenic, cadmium, zinc, copper, tin, antimony and other materials.