Show C Balloons Chemical balloons are now lift lift- lifting lifting ing from low grade minerals which were once disregarded quantities of vital copper zinc lead nickel tung- tung tungsten tungsten sten chromium and other strategic metals In mining camps enormous loads of low grade ore ground around in water pow flow daily into boxes called cells Minute amounts of chemicals are mixed with the ore The chem chem- chemicals chemicals attach themselves selectively to the grains of the minerals and air bubbles lift them to the surface |